Chelarctus crosnieri, Holthuis, 2002

Ueda, Kenta, Yanagimoto, Takashi, Chow, Seinen, Kuroki, Mari & Yamakawa, Takashi, 2021, Molecular Identification of Mid to Final Stage Slipper Lobster Phyllosoma Larvae of the Genus (Crustacea: Decapoda: Scyllaridae) Collected in the Pacific with Descriptions of Their Larval Morphology., Zoological Studies 60 (75), pp. 1-21 : 10

Chelarctus crosnieri sub sp. 1

Stage V (KH16-4-1, Fig. 11 )

TL = 6.60 mm; CL = 4.70 mm; CW = 5.62 mm; TW = 3.05 mm; AL = 0.61 mm; CW/CL = 1.19; CW/ TW = 1.84. This description was completed for the specimen collected from 19°00'S, 147°30'W (offshore of French Polynesia, the south Pacific) on 11 September 2016.

Cephalic shield ( Fig. 11A ): sub-pentagon, slightly wider than long, nearly twice as wide as thorax. Antennule ( Fig. 11B ): biramous, 3-segmented, exceeding antenna; distal segment with two flagella (primary and accessory); primary flagellum unsegmented with at least eight rows of sensory setae, much longer than accessory flagellum. Antenna ( Fig. 11B ): bifurcated, unsegmented, half H-shaped (├), short lateral process projecting horizontally. Maxillule 1 ( Fig. 11E ): anterior lobe with denticulate three strong setae; posterior lobe with denticulate two strong setae Maxillule 2 ( Fig. 11C ): rudimentary flattened. Maxilliped 1 ( Fig. 11C ): rudimentary bud. Maxilliped 2 ( Fig. 11C, D ): 5-segmented, coxal spine absent, four long terminal setae on propodus, at least four fine setae on dactylus. Maxilliped 3 ( Fig. 11A ): 5-segmented, ventral coxal spine, distal part of the propodus and dactylus densely setosed; exopod absent. Pereiopods 1–4 ( Fig. 11A ): biramous, distinct coxal spine and 5-segmented endopod, ischio-merus fused to basis, single long distal spine on basis, two distal spines on ischio-merus and carpus. Pereiopod 5 ( Fig. 11F, G ): two-segmented, coxal spine absent, extending to half of abdomen. Abdomen ( Fig. 11F, G ): four pairs of pleopod bud; slightly bilobed uropod, rounded posterior margin locating far anterior of central margin of telson; not well developed posterolateral spines of telson exceeding posterior central margin of telson.

Figures

Fig. 11. Phyllosoma larva of Chelarctus crosnieri sub sp., stage V. A, ventral view; B, ventral view of eye, antennule and antenna; C, 2nd maxillule, 1st and 2nd maxilliped; D, distal end of 2nd maxilliped; E, ventral view of 1st maxillule; F, ventral view of 5th pereiopod and abdomen; G, dorsal view of 5th pereiopod and abdomen.