Paratimea duplex, (TOPSENT, 1927)

Morrow, Christine, Cárdenas, Paco, Boury-Esnault, Nicole, Picton, Bernard, Mccormack, Grace, Soest, Rob Van, Collins, Allen, Redmond, Niamh, Maggs, Christine, Sigwart, Julia & Allcock, Louise A., 2019, Integrating morphological and molecular taxonomy with the revised concept of Stelligeridae (Porifera: Demospongiae), Zoological Journal of the Linnean Society 187, pp. 31-81 : 46

publication ID	B075CE1-0B62-4EE9-8EF6-7E51C2745CA8
publication LSID	lsid:zoobank.org:pub:B075CE1-0B62-4EE9-8EF6-7E51C2745CA8
DOI	https://doi.org/10.5281/zenodo.14828968
persistent identifier	https://treatment.plazi.org/id/FA001443-686B-FFF6-FED4-FBA7FC58FB2B
treatment provided by	Plazi
scientific name	Paratimea duplex
status

Treatment

PARATIMEA DUPLEX ( TOPSENT, 1927) View in CoL

( FIG. 3A–D; REPRODUCED FROM TOPSENT, 1928: PL. 6, FIG. 21)

Material examined: Type material: Holotype MNHN-DT-1094, dried specimen, station 1116, 50 miles off the coast of Mogador, Morocco, 31°43.50′N, 10°46.75′W, 2165 m, 11 July 1901; habitat: pink mud made up of Foraminifera (slide only). GoogleMaps

Paratypes: MNHN-DT-1093, station 1116 (see above), specimen in alcohol; MNHN-DT-1191, station 1242, Banc de Seine , France, 240 m, 10 September 1901; habitat: broken shell and gravel (slide only) .

ZMA POR19447 View Materials (slide only), Porcupine Bank , west of Ireland, 55°26.64′N, 16°04.5′W, 6 September 2004, 773 m, Box Core GoogleMaps , RV Pelagia , coll. R. W. M. Van Soest .

Paratype Halicnemia duplex MNHN-DT-1093, station 1116, 31°43.5′N, 10°46.75′W, 50 miles from Mogador, Morocco, 11 July 1901, 2165 m, Prince Albert of Monaco cruises GoogleMaps .

Description: Outer morphology: Topsent (1928) describes two specimens from station 1116 as growing on the deep-water coral Desmophyllum pertusum (Linnaeus, 1758) ; the type is cushion shaped, 3 mm thick, with a conulose surface.

Colour: Topsent (1928) describes the colour as greyish in alcohol.

Choanosomal skeleton: Principal spicules have a disordered arrangement, spongin lacking, making the skeleton lax and friable. Asters abundant throughout skeleton.

Ectosomal skeleton: Tufts of centrotylote oxeas encircle large oxea, which occupy the axis of the conule; asters very abundant ( Fig. 3D).

Megascleres: Megascleres are centrotylote oxeas 2.0– 2.6 mm × 20–40 mm, and styles to subtylostyles 1.6– 1.8 mm × 25–35 µm ( Fig. 3A–C).

A c c e s s o r y o x e a s: We a k l y c e n t r o t y l o t e o x e a s, 360–770 µm. × 7–9 µm.

Microscleres: Microscleres are oxyasters without centrum, smooth rayed, with rays of unequal lengths. Asters 50–100 µm in diameter, with 10–15 rays ( Fig. 3A, C).

Remarks: Topsent (1928) notes that Paratimea duplex is unusual in having a mix of oxeas, styles and tylostyles as the principal megascleres. The oxea are much more common and are larger than the styles or tylostyles.