Chelarctus, Holthuis, 2002
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publication ID |
https://doi.org/ 10.6620/ZS.2021.60-75 |
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persistent identifier |
https://treatment.plazi.org/id/03FC87F3-FFCA-BD61-4B13-FF4CE1ACFD4C |
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treatment provided by |
Felipe |
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scientific name |
Chelarctus |
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? Chelarctus View in CoL sp-1
Stage V (SHU09-6, Fig. 12 View Fig )
TL = 9.64 mm; CL = 6.09 mm; CW = 7.69 mm; TW = 4.22 mm, AL = 1.24 mm, CW/CL = 1.26, CW/ TW = 1.82. This description was completed for the specimen collected at 25°33'N, 127°02'E, Ryukyu Archipelago, on 23 June 2009.
Cephalic shield ( Fig. 12A View Fig ): sub-pentagon; wider than long, nearly twice as wide as thorax. Antennule ( Fig. 12B View Fig ): similar in length to antenna; biramous, 3-segmented, distal segment with two flagella (primary and accessory); primary flagellum unsegmented with at least eight rows of sensory setae, slightly longer than accessory flagellum. Antenna ( Fig. 12B View Fig ): bifurcated, unsegmented, half H-shaped (├), short lateral process projecting horizontally. Maxillule 1 ( Fig. 12E View Fig ): anterior lobe with denticulate three strong setae; posterior lobe with denticulate two strong setae. Maxillule 2 ( Fig. 12C View Fig ): unbilobed. Maxilliped 1 ( Fig. 12C View Fig ): rudimentary bud. Maxilliped 2 ( Fig. 12C, D View Fig ): 5-segmented, coxal spine absent, three short setae on dactylus; six long setae on posterior margin of propodus ( Fig. 12D View Fig ). Maxilliped 3 ( Fig. 12A View Fig ): 5-segmented, distinct coxal spine; distal parts of propodus and dactylus setosed densely; exopod absent. Pereiopods 1–4 ( Fig. 12A View Fig ): biramous, distinct coxal spine and 5-segmented endopod; ischio-merus fused to basis; two distal spines on ischio-merus; two distal spines on the carpus. Pereiopod 5 ( Fig. 12F, G View Fig ): 2-segmented, coxal spine absent, extending to half of abdomen. Abdomen ( Fig. 12F, G View Fig ): four pairs of undeveloped pleopod buds; slightly bilobed uropod, rounded posterior margin locating well anterior of central margin of telson; posterolateral spine of telson well exceeding posterior central margin of telson, similar in length to uropod.
Stage VI (SHU09-7, Fig. 13 View Fig )
TL = 13.71 mm; CL = 10.02 mm; CW= 13.04 mm; TW = 5.66 mm; AL = 2.88 mm; CW/CL = 1.30; CW/ TW = 2.30. This description was completed for the specimen collected at 25°33'N, 127°02'E, Ryukyu Archipelago, on 23 June 2009.
Cephalic shield ( Fig. 13A View Fig ): wide sub-rectangular; larger CW/CL and CW/TW than in stage V. Maxillule 2 ( Fig. 13C View Fig ): posterior lobe slightly projecting backward. Maxilliped 1 ( Fig. 13C View Fig ): bud. Maxilliped 2 ( Fig. 13C, D View Fig ): tiny coxal spine; four setae on dactylus. Pereiopod 5 ( Fig. 13F, G View Fig ): 3-segmented, distinct coxal spine, exceeding half of abdomen. Abdomen ( Fig. 13F, G View Fig ): bilobed uropods.
Stage VII (SHU09-8, Fig. 14 View Fig )
TL = 17.41 mm; CL = 10.95 mm; CW = 16.20 mm; TW = 6.46 mm; AL = 4.69 mm; CW/CL = 1.47; CW/ TW = 2.51. This description was completed for the specimen collected at 25°33'N, 127°02'E, Ryukyu Archipelago, on 23 June 2009.
Cephalic shield ( Fig. 14A View Fig ): larger CW/CL and CW/TW than in stage VI. Antennule ( Fig. 14B View Fig ): primary flagellum similar in length to accessory flagellum. Maxilliped 1 ( Fig. 14C View Fig ): rudimentary biramous. Maxilliped 2 ( Fig. 14C View Fig ): distinct coxal spine. Maxilliped 3 ( Fig. 14A View Fig ): damaged. Abdomen ( Fig. 14F, G View Fig ): four pairs of bilobed pleopods.
Stage VIII (SHU09-9, Fig. 15 View Fig )
TL = 23.65 mm; CL = 13.86 mm; CW = 18.84 mm; TW = 8.4 mm; AL = 7.36 mm; CW/CL = 1.35; CW/TW = 2.24. This description was completed for the specimen collected at 25°16'N, 124°58'E, on 19 June 2009.
Cephalic shield ( Fig. 15A View Fig ): smaller CW/CL and CW/TW than in stage VII. Antenna ( Fig. 15B View Fig ): lateral process projecting slightly antero-diagonally. Maxillule 1 ( Fig. 15E View Fig ): posterior lobe with denticulate two strong setae. Maxillule 2 ( Fig. 15C View Fig ): flattened and outer lobe extending backward. Maxilliped 1 ( Fig. 15C View Fig ): biramous; anterior lobe shorter than posterior lobe. Pereiopods 1−4 ( Fig. 15A View Fig ): gill buds. Pereiopod 5 ( Fig. 15F, G View Fig ): 4-segmented. Abdomen ( Fig. 15F, G View Fig ): round uropod margin near reaching but never exceeding posterior central margin of telson; posterolateral spines of telson shorter than uropod.
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