Chelarctus aureus (Holthuis, 1963)
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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-FFC7-BD64-4B3F-FE2CE563FEAC |
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treatment provided by |
Felipe |
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scientific name |
Chelarctus aureus (Holthuis, 1963) |
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Chelarctus aureus (Holthuis, 1963) View in CoL
Stage VI (SHU09-3, Fig. 8 View Fig )
TL = 9.40 mm; CL = 5.81 mm; CW = 8.88 mm; TW = 4.50 mm; AL = 1.26 mm; CW/CL = 1.30; CW/ TW = 2.1. This description was completed for the specimen collected at 26°09'N, 126°01'E (around the Ryukyu Archipelago) on 10 June 2009.
Cephalic shield ( Fig. 8A View Fig ): wide sub-rectangular; wider than long, more than twice as wide as thorax, slightly concaved posterior edge. Antennule ( Fig. 8B View Fig ): biramous, 3-segmented, exceeding antenna; distal segment with two flagella (primary and accessory); primary flagellum unsegmented with at least six rows of sensory setae, slightly longer than accessory flagellum. Antenna ( Fig. 8B View Fig ): bifurcated, unsegmented, half H-shaped (├); short lateral process projecting horizontally. Maxillule 1 ( Fig. 8E View Fig ): anterior lobe with denticulate three strong setae; posterior lobe with denticulate three strong setae. Maxillule 2 ( Fig. 8C View Fig ): rudimentary bilobed. Maxilliped 1 ( Fig. 8C View Fig ): elongated bud. Maxilliped 2 ( Fig. 8C, D View Fig ): 5-segmented, tiny coxal spine; four setae on dactylus; three long setae on distal margin of propodus. Maxilliped 3 ( Fig. 8A View Fig ): damaged propodus; tiny spine on ventral margin of coxa; exopod absent. Pereiopods 1–4 ( Fig. 8A View Fig ): biramous, distinct coxal spine, 5-segmented endopod; ischio-merus fused to basis; two short distal spines on basis; two sharp distal spines on ischio-merus; two distal spines on the carpus; a dense of setae covering ischio-merus. Pereiopod 5 ( Fig. 8F, G View Fig ): 2-segmented, tiny coxal spine, extending to half of abdomen. Abdomen ( Fig. 8F, G View Fig ): four pairs of unbilobed pleopods; bilobed uropods, rounded posterior margin locating far anterior of central margin of telson; posterolateral spines of telson similar in length with uropod exceeding posterior central margin of telson.
Stage VII (SHU09-4, Fig. 9 View Fig )
TL = 17.78 mm; CL = 13.09 mm; CW = 18.19 mm; TW = 7.17 mm; AL= 4.57 mm; CW/CL = 1.34; CW/ TW = 2.54. This description was completed for the specimen collected at 26°10'N, 126°01'E (around the Ryukyu Archipelago) on 10 June 2009.
Cephalic shield ( Fig. 9A View Fig ): more than 2.5-times wider than thorax, concaved posterior edge. Antennule ( Fig. 9B View Fig ): primary flagellum with at least 14 rows of sensory setae, similar in length to accessory flagellum. Maxillule 2 ( Fig. 9C View Fig ): slightly bilobed. Maxilliped 1 ( Fig. 9C View Fig ): rudimentary bilobed. Maxilliped 2 ( Fig. 9C, D View Fig ): bearing six short setae on dactylus; exopod bud. Maxilliped 3 ( Fig. 9A View Fig ): 5-segmented, tiny coxal spine; dense of setae covering surface of fourth and fifth segments. Pereiopod 5 ( Fig. 9F, G View Fig ): 3-segmented, distinct coxal spine, exceeding half of abdomen. Abdomen ( Fig. 9F, G View Fig ): four pairs of bilobed pleopods; posterolateral spines of telson slightly shorter than uropod.
Stage VIII (SHU09-5, Fig. 10 View Fig )
TL = 23.38 mm; CL = 16.12 mm; CW = 21.99 mm; TW = 9.85 mm; AL = 8.43 mm; CW/CL = 1.36; CW/ TW = 2.23. This description was completed for the specimen collected at 25°30'N, 126°05'E (around the Ryukyu Archipelago) on 8 June 2009.
Antennule ( Fig. 10B View Fig ): primary flagellum with 15 rows of sensory setae, shorter than accessory flagellum. Antenna ( Fig. 10B View Fig ): lateral process slightly projecting antero-diagonally. Maxillule 2 ( Fig. 10C View Fig ): bilobed, more flattened and anterior and posterior lobes extend more than stage VII. Maxilliped 1 ( Fig. 10C View Fig ): bilobed; posterior lobe extending backwards and larger than anterior lobe. Maxilliped 2 ( Fig. 10C View Fig ): distinct coxal spine. Pereiopods 1−4 ( Fig. 10A View Fig ): gill buds present on the base of the coxa, short strong coxal spine, at least 20 pairs of short spine-like setae scattered over the surface of propodus. Pereiopod 5 ( Fig. 10F, G View Fig ): 4-segmented extending more than during stage VII. Abdomen ( Fig. 10F, 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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