taxonID	type	description	language	source
707B8788FFC7FFDEFF750EA67BAEFD4F.taxon	diagnosis	Diagnosis. Three parathoracic segments. Opercular crown and stalk completely fused along entire anterior margin. Opercular paleae arranged in 3 concentric circlets made of three or four kinds of paleae. Outer and inner row of paleae of a single kind, and middle row of paleae made up either of a single kind of palea or of two kinds of paleae, long and short. Nuchal spines absent. Dorsal branchiae present in parathoracic and abdominal segments.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC7FFDBFF750DF17BC2FDCC.taxon	materials_examined	Material examined. Two paratypes, USNM- 38577, Sea of Japan, Tartar Strait, Sta. 20 / 2206, coll. by Okhriamkin, 1931, Zoological Institute of the Academy of Sciences, USSR, Accession Number 278429.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC7FFDBFF750DF17BC2FDCC.taxon	description	Description. One paratype 35 mm long, 5.0 mm wide at widest part of opercular crown, 5.0 mm wide at parathoracic chaetigers, ca. 35 abdominal chaetigers (middle parts damaged), incomplete, cauda ca. 3.0 mm long and bent backwards on ventrum. Another paratype incomplete, posterior abdomen missing, abdominal chaetigers 20, body length 30 mm, head region ca. 8.0 mm long, body width 5.0 mm at parathoracic chaetigers. Body of preserved worms light brown. Anterior end of opercular stalk completely fused, not separated into two lobes (Fig. 2 A, B); in lateral view narrowing anteriorly, sloping posteriorly towards dorsal midline. Operculum dish-shaped, flat to slightly concave. Paleae bright yellow or light brown, arranged in three concentric circlets of palea, the outer, the middle, and the inner (Fig. 2 D, E). Outer paleae weakly curved outward from longitudinal axis of shaft, 70 and 77 in number, blade ca. 1.0 mm long, ca. 0.2 mm wide (Figs. 2 B-E, 3 A, B). Inner surface of their blades with ca. 40 to 50 fine closely-spaced thecal bands, with 3 – 5 distal teeth on either side of a pilose plume (Figs. 1 B, 2 D, E, 3 A, B). Middle paleae of long and short kinds in irregular alternating rows; 4 short and 19 long in one of two paratypes (Fig. 2 C) and of a single long form and 36 short forms in another (Fig. 2 D), with blades of long forms with compressed vertically, weakly recurved blunt tips. Inner paleae geniculate, obovate, their anterior ends with pointed tips. Nuchal spines not observed. Anterior outer margin of opercular crown with 18 – 20 fleshy conical papillae in single row on each side (Fig. 2 A, B). Ventral margin of bucal cavity with over 50 longitudinal rows of feeding tentacles on each side. Building organ U-shaped, with conical cirri, forming upper lip on ventral side. Three parathoracic chaetigers with oar-shaped chaetae and spine-like companion chaetae in 2 or 3 rows on each neuropodium with 10 chaetae. Abdominal region with at least 22 – 25 chaetigers. Dorsal branchiae present in parathoracic and anterior-most ca. 10 abdominal chaetigers. Dorsal branchiae diminishing in size posteriorly, with horizontal rows of cirri. Variation. In the original description, Kirtley (1994) described the paleae of middle series with alternating long, curving nearly vertical blades (Fig. 1.6. b of Kirtley 1994: 25) and shorter blades with broad, slightly concave upper surface and rounded, rugose distal margins (Fig. 1.6 c of Kirtley 1994: 25). But in two paratypes observed here, middle paleae arranged in alternate rows, varying from 1 to 19 long paleae per row and from 4 to 36 short paleae per row (Fig. 2 D, E). Eyespots not observed in preserved specimens. Unfortunately, we were not able to obtain the holotype to compare its trunk characters with those in paratypes described here. Tube. No complete tubes were available for examination, only debris from tube fragments were present in the vial.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC7FFDBFF750DF17BC2FDCC.taxon	materials_examined	Type locality. Far Eastern Seas of Russia, Tartar Strait, the Sea of Japan.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC7FFDBFF750DF17BC2FDCC.taxon	distribution	Distribution. Far Eastern Seas of Russia (Bering Sea, Sea of Okhotsk, Sea of Japan).	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC7FFDBFF750DF17BC2FDCC.taxon	discussion	Remarks. Neosabellaria uschakovi is a unique species of the genus in having two kinds of the middle paleae arranged in irregular alternating rows; other six species have only one kind of middle paleae (Bailey- Brock et al. 2007). The exact number of long and short middle paleae varied in each individua more than described by Kirtley (1994).	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFDBFF750DC97856FC51.taxon	diagnosis	Diagnosis. Three parathoracic segments. Opercular crown and stalk completely divided at anterior midline into two symmetrical lobes. Opercular paleae on each lobe arranged in 3 rows made of three or four kinds of paleae. Outer and inner row of paleae of a single kind, and middle row of paleae made either of a single kind of paleae or of two kinds of paleae, long and short. Nuchal spines present or absent. Dorsal branchiae present in parathoracic and abdominal segments.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFD4FF750B1B7EF5FB2C.taxon	materials_examined	Material examined. Paratype BMNH (= NHM) 62 - 14 - 61, one specimen without tube, Galle Face, Colombo, Sri Lanka, examined by Kirtley in 1973.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFD4FF750B1B7EF5FB2C.taxon	description	Description. Paratype, 12 mm long, 2 mm wide at widest part of opercular crown, 1 mm wide at parathoracic chaetigers. Cauda ca. 2 mm long and bent back on ventrum. Body of preserved worms brown. Anterior end of opercular stalk separated into two symmetrical lobes (Fig. 5 B, C). Lobes narrowing anteriorly, sloping posteriorly towards dorsal midline (Fig. 5 A, B). Operculum dish-shaped, flat to slightly concave. Paleae bright yellow or light brown, arranged in three rows (outer, middle, inner) on each lobe. Outer paleae curved outward from longitudinal axis of shaft (Fig. 5 B), inner surface of their blades with ca. 40 – 50 fine, closely-spaced thecal bands. Outer paleae with 3 – 4, up to 5 distal teeth on either side, in some paleae the number asymmetrical, e. g., 3 and 4, 4 and 5 (Fig. 4, 6 A, E). A pilose (i. e., denticulate with 2 – 4 small lateral teeth on each side) median plume emerging from the base or middle of central tooth (Figs. 4 F, G, 6 A, B). Pilose median plume with 5 to 10 small lateral spines on its side (Figs. 4 G, 6 E). Some median plume spines destroyed, one or two small lateral teeth on median plume may present in some outer paleae. Middle paleae of long and short kinds, 4 to 5 long forms and 5 – 6 short forms (Figs. 4 A – D, 6 B, C), blades of long forms laterally compressed with knife-like edges and weakly recurved blunt tips (Figs. 4 F, 6 B). Inner paleae terminating with moderately sharp tips (Figs. 4 H, 6 D). One or two pairs of nuchal spine semi-transparent and straight, with blunt tips. Anterior outer margin of opercular crown with 7 – 9 fleshy conical papillae in a single row on each side (Fig. 5 A, B). Ventral margin of buccal cavity with over 30 longitudinal rows of feeding tentacles on each side. Building organ (bo) U-shaped, with conical cirri, forming upper lip on ventral side. Feeding tentacles pale or with brown pigments, extending beyond the length of the operculum. Three parathoracic chaetigers (pt) with 5 – 10 stout, oar-shaped chaetae and spine-like companion chaetae in 2 or 3 rows on each neuropodium and ca. 10 chaetae on each notopodium. Abdominal region with 21 chaetigers. Ten anterior-most abdominal chaetigers with long dorsal branchiae diminishing in size posteriorly; branchiae absent in most posterior chaetigers (Fig. 5 E). Eyespots not observed in preserved specimens. Variation. The outer paleae ca. 0.4 mm long and ca. 0.1 mm wide. Number of these paleae 22 – 24 on each side. The median plume not seen in some outer paleae. The short kinds of medium paleae rounded.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFD4FF750B1B7EF5FB2C.taxon	materials_examined	Type locality. Colombo, India. Tube. Not available for examination.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFD4FF750B1B7EF5FB2C.taxon	distribution	Distribution. Coast of India.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC2FFD4FF750B1B7EF5FB2C.taxon	discussion	Remarks. The nuchal spines are present in the paratype (Fig. 5 D). Based on Kirtley (1994), the numbers of distal lateral teeth of outer paleae in S. chandraae and S. ranjhi are very similar, and these species are distinguished by the shape of the middle (short) paleae and inner paleae (Kirtley's note on page 56 states that S. ranjhi have more distal teeth on each side of plume than S. chandraae). Based on the examination of paratype of S. chadraae, we suggest possible synonymy of S. chandraae and S. ranjhi because of close similarity of paleae characters and geographic distribution of these two species (around India and adjacent waters). However, the final decision regarding the synonymy should be made after careful comparison of type specimens of both species. Unfortunately, obtaining old type material from the collections in Pakistan and India is very difficult and our search for the type material of S. ranjhi has been unsuccessful.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFCDFFD1FF750A167E84FAF9.taxon	materials_examined	Material examined. Syntype ZMH V- 11422. Four syntypes and parts of tubes (made of sand granules and shell fragments). Soerabaia, Java, 14 – 16 m, collected by Buitendyk, 1906.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFCDFFD1FF750A167E84FAF9.taxon	description	Description. Syntype I - incomplete and posterior abdomen missing, 15 mm long, 2.0 mm at widest part of opercular crown, 16 abdominal chaetigers. Syntype II - complete, 28 mm long, 2.0 mm wide at parathoracic, cauda 7 mm long. Syntype III - complete, 25 mm long, 2.5 mm wide at parathoracic, 3.0 mm width at crown, 25 abdominal chaetigers. Syntype IV - complete, 30 mm long, 2.0 mm wide at parathoracic, cauda 7.0 mm long, 24 abdominal chaetigers. Cauda ca. 5.0 to 7.0 mm long and bent back on ventrum. Body of preserved worm creamy or shiny white. Anterior end of opercular stalk not fused, separated into two symmetrical lobes (Fig. 7 A, B). Lobes of similar width from anterior to posterior, slightly sloping posteriorly toward dorsal midline (Fig. 8 B). Operculum flat to slightly concave or dish-shaped (Figs. 7, 8 C, E). Colour of crown tan to brown with charcoal black specks and blotches. Paleae bright yellow or light brown, arranged in three rows (outer, middle, inner) on each lobe (Figs. 7 A, 8 E). Outer paleal crown with 30 – 36 flattened, semi-triangular paleae on each side (Fig. 8 A, B). Outer paleae curved slightly outward from longitudinal axis of shaft, central tooth ends with median plume, one pair of lateral teeth with sharp, sometimes bent tips (Fig. 9 A, B). Outer palea (op) approximately 1 mm long (excluding median plume) and 0.2 to 0.25 mm wide at base. Inner surface of their blades with approximately 50 fine closely-spaced thecal bands (Fig. 9 A, B). Median plume extended, approximately 0.02 mm long, with base wider than lateral teeth (Fig. 9 A, B). Middle paleae of single kind, 20 – 24 in each row, with rounded tips, blades with thecal bands (Fig. 9 B). Inner row of paleae with 22 – 25 pairs of paleae, slender ones with denticles on distal margins of elongate blade (Fig. 9 D). Surface of excavated blade with thecal bands. Fourfive nuchal spines on each side of anterio-dorsal midline of prostomium (Fig. 8 A). Anterior outer margin of opercular crown with 25 – 30 fleshy conical papillae in single row on each side (Fig. 8 A – C). Ventral margin of buccal cavity with over 20 longitudinal rows of feeding tentacles (ft) on each side (Figs. 7 B, 8 B – C). Building organ (bo) U-shaped, with conical cirri, forming upper lip on ventral side (Fig. 8 C). Feeding tentacles pale or with brown pigments, extending beyond the length of the operculum in some worms or shorter and not obscuring the operculum in others. Inferior lobes of second chaetiger with fascicle of 8 – 10 bipinnate capillary chaetae and conical lateral cirri (Fig. 8 A, B). Superior lobes with achaetous conical cirri along lateral margin of opercular lobe, with dorsal conical branchiae (Fig. 8 A, B). Three parathoracic chaetigers (pt) with 8 – 10 stout, oar-shaped chaetae and spine-like companion chaetae in 2 or 3 rows on each neuropodium and about 10 chaetae on each notopodium (Fig. 9 B). Abdomen with 25 – 30 chaetigers in syntypes, with bundles of 10 – 15 long simple capillaries and finely serrated neurochaetae, and elongate conical ventral cirri with uncinigerous tori. Anterior-most 6 – 10 abdominal chaetigers with long dorsal branchiae diminishing in size posteriorly, but branchiae present in most posterior chaetigers (Fig. 8 E). Branchiae with horizontal cirral rows (Figs. 7 C, 8 A). Eyespots not observed in preserved specimens. Variation. Three of four syntypes complete, 20.0 to 25.0 mm long, 4.0 to 5.0 mm wide at widest part of opercular crown. Many median plumes destroyed and lost from the type specimens. Cauda long, 7 to 8 mm in length, and bent back on ventrum (Fig. 8 E). Tube. The tube constructed of sand granules and shell debris (Fig. 7 D); inner side coated with a thin membrane. Tube length up to 10 mm, tube aperture 3.0 – 4.0 mm in diameter. Approximately ten congregated tubes found in the sample; they probably sometimes form small colonies (Fig. 7 D).	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFCDFFD1FF750A167E84FAF9.taxon	materials_examined	Type locality. Soerabaia, Java, Indonesia.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFCDFFD1FF750A167E84FAF9.taxon	distribution	Distribution. Coast of Java, Indonesia.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFCDFFD1FF750A167E84FAF9.taxon	discussion	Remarks. The species is known only from the type-locality of the syntype (Augener, 1934). Sabellaria javanica differs from other species of the genus by having a single kind of middle opercular paleae and a simple long median plume with a pair of lateral teeth on outer paleae (Figs. 8 E, 9 A, B).	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC8FFCEFF750A6C7B29FA91.taxon	materials_examined	Material examined. Holotype CMNH-ZW 0 1630, collected at Kohazuki beach, Iwawata, Onjuku, Boso Peninsula, intertidal zone of rocky shore, 14 June 2003, by hand, coll. J. Takayama. Paratypes, 20 specimens (AM W. 36825; BPBM-R 3417; CBM-ZW- 1026, 1027; CMNH-ZW 01629; CYPY-POLY 1030, 1031, 1032; NHM 2010.221, 222; MBM 179998, 179999; SAMA E 3730; SMF 19450; USNM 1143566; ZIHU 3899, 3900; ZMUC-POL- 2114), collection data same as for holotype.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC8FFCEFF750A6C7B29FA91.taxon	description	Description. Holotype, immature complete specimen, 20.0 mm long, 1.5 mm wide at widest part of opercular crown, 2.0 mm wide at parathoracic chaetigers. Anterior end of opercular stalk completely divided into 2 bilaterally symmetrical lobes (Fig. 11 A, C) narrowing anteriorly, sloping posteriorly towards dorsal midline (Fig. 11 A, B). Operculum dish-shaped, flat to slightly concave. Paleae bright yellow, with light pink or colourless bases (embedded in tissue). Opercular paleae in three rows (outer, middle, inner) on each lobe (Fig. 13 A). Outer paleae ca. 0.1 mm long and ca. 0.05 mm wide, curved slightly outward from longitudinal axis of shaft (Fig. 13 B), inner surface of their blade with ca. 50 fine closely-spaced thecal bands (Fig. 12 C). Distal ends of outer paleae with a median pilose plume and 2 – 3 pairs of lateral distal teeth with sharp tips (N = 15, average = 2.67, SD = 0.62: paratype CMNH ZW 01629; Fig. 12 A – C). Plume short, pilose (i. e., denticulate with 2 – 4 small lateral teeth on each side), emerging from top or middle of central tooth (N = 15, average = 3.0, SD = 0.53: paratype CMNH ZW 01629), decreasing in size distally (Fig. 12 A – C). Middle paleae of two types, long and short. Long arranged in five pairs, with erect blades tapering slowly to blunt tips recurved towards outer margin of crown (Figs. 12 D, 13 C). Short arranged in five to six pairs, geniculate, with thick wide blades terminating distally in blunt tips (Fig. 12 E). Blades of long and short kinds of paleae with transverse thecal bands. Inner paleae in 9 or 10 pairs, similar in shape to the short form of middle paleae, but usually smaller in size with shorter blades (Fig. 12 F). Surface of excavated blades of inner palea with transverse thecal bands (Fig. 12 F); blades semi-transparent, colorless, slender, straight, with blunt tips. One to three dorsal nuchal spines arising from each side of dorsal midline (Figs. 11 A, 13 B). Anterior outer margin of opercular crown with 9 – 10 fleshy conical papillae in single row on each side (Fig. 11 A, B). Ventral margin of buccal cavity with 10 – 15 longitudinal rows of feeding tentacles on each side (Fig. 11 B, C). A pair of grooved tentacles located after the stoma. Building organ U-shaped, with conical cirri, forming upper lip on ventral side (Fig. 11 C). Inferior lobes of second chaetiger with fascicle of ca. 8 bipinnate capillary chaetae and conical lateral cirrus. Superior lobes with achaetous conical cirri along lateral margin of opercular lobe, with dorsal conical branchia (Fig. 11 A, B). Three parathoracic chaetigers with 8 – 10 stout oar-shaped chaetae (Fig. 13 D) and spine-like companion chaetae in 2 or 3 rows on each neuropodium and ca. 10 chaetae on each notopodium. Abdominal region with 25 chaetigers with bundles of 10 – 15 long simple capillaries and finely serrated neurochaetae (Fig. 13 E), and elongate conical ventral cirri with an uncinigerous torus. Neurochaetal conical cirri arising from base of bundle in first abdominal segment. In the first three abdominal chaetigers the conical cirri have lateral projection, after third abdominal chaetiger, the cirri decrease to short lobe. Uncinigerous tori with chaetae in single row. Notopodial uncini bi-pectinate with 6 or 7 rows of teeth superimposed (Fig. 13 F). Twelve anterior-most abdominal chaetigers with dorsal branchiae, diminishing in size posteriorly (Fig. 11 D). The branchiae short in anterior chaetigers, by third parathoracic the branchiae become longer, and maintain the length until third abdominal chaetiger. After third chaetiger the branchiae decrease towards posterior chaetigers until they disappear in last abdominal chaetigers. Caudal region septate composed of fused achaetous segments, 3.0 mm long and bent back on ventral with anus and 25 – 30 anal appendices. Eyespots brownish to reddish in color on each filament of compound feeding tentacles. Brown eyespots also on opercular peduncle, on inner surface of serial conical palps extended to mid-ventral indentation, on prostomium, on peristomium between compound feeding tentacles, on median cirrus (from base to upper edge), on thoracic region, and on parathoracic region (a large patch of numerous eyespots in ventral side of third chaetiger). Black eyespots on ventral side of abdomen and in caudal region. These eyespots absent on the first abdominal chaetiger, after the second abdominal chaetiger they form C-shaped pads, after 5 th abdominal chaetiger the eyespots increase in number and become organized in patches of numerous eyespots. Variation. Paratypes with four or six pairs of the long form of middle row paleae and five or six pairs of the short form of middle row paleae. Inner surface of the short form depressed in basal part (Fig. 12 D). The paleae in paratypes 15.0 – 30.0 mm long and 0.8 – 2.2 mm wide at parathoracic chaetigers. Abdominal region with 10 – 30 chaetigers. Anterior-most 10 – 15 abdominal chaetigers with dorsal branchiae decreasing in size posteriorly. The cauda 3.0 – 5.0 mm in length. Tube. Tubes constructed of sand and shell debris, with inner side coated with a thin membrane. Tubes highly gregarious, forming large honey-comb colonies over 2.0 m wide. Tube orifice 1.0 – 1.5 mm in diameter.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC8FFCEFF750A6C7B29FA91.taxon	discussion	Remarks. Among 35 species of Sabellaria described worldwide (including S. isumiensis n. sp.), 21 are reported to have both nuchal spines and long middle paleae (Table 1). However, to confirm the presence of nuchal spines, observation of sectioned specimens is required, because nuchal spines can be very small and inserted in the opercular stalk. Sabellaria isumiensis n. sp. differs from all other members of the genus by having both straight nuchal spines and long middle paleae with distal tips curved towards the periphery of the crown (Table 1). The new species resembles closely S. chandraae (de Silva, 1961) from Sri Lanka and S. ranjhi (Hasan, 1960) from Pakistan, in having long and short middle paleae and denticulate outer paleae (Figs. 13, 14). Sabellaria isumiensis n. sp. can be distinguished from those two species by the outer paleae morphology, i. e., pilose median tooth of S. chandraae has 5 – 8 lateral teeth (Fig. 6 A, E), but the medial tooth of S. isumiensis n. sp. has 2, 3 or 4 lateral teeth (Fig. 12 A – C). These three species are easily distinguished by the shape of the short middle palea: S. chandraae and S. ranjhi have clavate short middle paleae, while S. isumiensis n. sp. have elliptical ones.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC8FFCEFF750A6C7B29FA91.taxon	etymology	Etymology. The species epithet S. isumiensis is chosen for the type locality, Isumi area, Onjuku and Katuura, Boso Peninsula, Chiba Prefecture.	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
707B8788FFC8FFCEFF750A6C7B29FA91.taxon	materials_examined	Type locality. Onjuku to Katsuura, Isumi area, Pacific side of Boso Peninsula, Honshu, Japan. FIGURE 13. Sabellaria isumiensis n. sp. Scanning electron micrographs. Opercular crown (A), nuchal spine and outer paleae (B), middle palea (C), 3 rd parathoracic oar-shaped chaetae (D), abdominal chaetae (E), and posterior abdominal uncini (F).	en	Nishi, Eijiroh, Bailey-Brock, Julie Helen, Santos, Andre Souza Dos, Tachikawa, Hiroyuki, Kupriyanova, Elena K. (2010): Sabellaria isumiensis n. sp. (Annelida: Polychaeta: Sabellariidae) from shallow waters off Onjuku, Boso Peninsula, Japan, and re-descriptions of three Indo-West Pacific sabellariid species. Zootaxa 2680: 1-25, DOI: 10.5281/zenodo.199292
