Scyllarides haanii, (De Haan, 1841) (De Haan, 1841)

Results View in CoL

DNA analysis. The nucleotide sequence determined was 432 bp and available in the public databases through the DNA Data Bank of Japan under the International Nucleotide Sequence Databases (INSD) accession number LC763119. Against this sequence, the most similar sequences returned by BLAST search were of Scyllarides haanii (INSD accession numbers JN701690, JN701691, and MN817127), in which the K2P distances between the sequences ranged 0.00%–1.17%. The phylogenetic tree ( Fig. 1 View Fig ) unambiguously determined this phyllosoma to be S. haanii .

Larval description of Scyllarides haanii , stage X. The phyllosoma stage of the present specimen was determined according to Robertson’s (1969a) stage key for phyllosoma.

Dimensions: TL= 39.5 mm, CL= 28.8 mm, CW =25.0 mm, TW = 17.8 mm, PL = 6.4 mm.

Cephalothorax ( Figs 2 View Fig , 3A View Fig ): outline of cephalic shield ellipsoid, slightly wider than long (CL/CW ratio = 1.15), and much wider than thorax (CW/TW ratio = 1.40). Small overhang plate behind the base of eyestalk ( Fig. 3B View Fig ).

Antennule ( Fig. 4A View Fig ): peduncle 3-segmented, outer flagellum longer than half length of inner flagellum, with 5–6 tiers of aesthetascs on its inner margin.

Antenna ( Fig. 4B View Fig ): flattened dorsoventrally, 3-segmented, the second segment anteriorly pointed.

Mandibles ( Fig. 4C View Fig ): slightly flattened dorsoventrally, asymmetrical in dentition. Incisor process and medial gnathal edge with a series of teeth. Molar process crowned by many denticules and minute papillae. Distal inner half portion of mandible covered with labrum and paragnath.

Maxillule ( Fig. 4D View Fig ): no endopod projection. Basal endite with 3 stout spines and 8 subterminal setae. Coxal endite with 12–13 stout setae.

Maxilla ( Fig. 4E View Fig ): endopodal area with 2 thin setae. Basal and coxal area with 2 and 1 thin anterior setae, respectively. Scaphognathite without marginal plumose setae.

Maxilliped 1 ( Fig. 4F View Fig ): 3-lobed process, with a short seta on endopodal area.

Maxilliped 2 ( Fig. 4G View Fig ): endopod 5-segmented, penultimate segment with 2 stout spines and 12 setae in total. Exopod rudimentary bud. No gill rudiments.

Maxilliped 3 ( Fig. 4H View Fig ): endopod 4-segmented, with many setae on distal segment. Exopod rudimentary bud. No gill rudiments.

Pereiopods 1–5 ( Fig. 3A View Fig ): exopods distally flagellated with annuli bearing a pair of natatory setae. No gill rudiments on pereiopods and thorax pleura.

Pleon ( Fig. 3C View Fig ): much narrower than thorax, somite segmented with biramous rudiments of pleopods ( Fig. 3D View Fig ) on somites 2–5. Uropod biramous, posterior margins of endopod and exopod reaching that of the telson. Telson oval without spines.