Caridina neglecta Cai & Ng, 2007
Mazancourt, Valentin de, Boseto, David, Marquet, Gerard & Keith, Philippe, 2020, Solomon’s Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species, European Journal of Taxonomy 696, pp. 1-86 : 14-17
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|Caridina neglecta Cai & Ng, 2007|
Caridina neglecta Cai & Ng, 2007: 1595 , figs 4–5 (type locality: Sungai Batang, 13 km on road from Palopo to Wotu, Sulawesi, Indonesia).
INDONESIA • ♂, cl 4.3 mm; Sulawesi, Sungai Batang, 13 km on road from Palopo to Wotu ; Mar. 1989; M. Kottelat and A. Werner leg.; MZB Cru 1570.
INDONESIA • 1 ♀, cl 4.4 mm; same collection data as for holotype; ZRC 2007.0096 View Materials .
SOLOMON ISLANDS – Choiseul Island • 1 ♂, cl 4.5 mm; Lokasereke River ; 06°58.024´S, 156°47.861´E; 45 m a.s.l.; 13 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; DNA voucher: CA1310; MNHN-IU- 2018-2808 GoogleMaps . – Kolombangara Island • 1 ♀ ovig., cl 4.2 mm; Liva River ; 08°03.863´S, 157°10.633´E; 18 m a.s.l.; 11 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; MNHN- IU-2019-106 GoogleMaps • 1 ♂, cl 3.1 mm; same collection data as for preceding; MNHN-IU-2019-105 GoogleMaps • 1 ♀ ovig., cl 5.0 mm; Jack Harbour River ; 08°03.085´S, 157°10.945´E; 11 m a.s.l; 11 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU- 2018-2811 GoogleMaps • 1 ♀ ovig., cl 4.7mm; Vanga 2 River ; 07°54.825´S, 156°57.762´E; 17 m a.s.l.; 18 Nov. 2015; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU- 2018-2812 GoogleMaps . – Vella Lavella Island • 1 ♀ ovig., cl 4.9 mm; Vala Kadju River ; 07°49.860´S, 156°42.644´E; 17 m a.s.l.; 28 Oct. 2016; P. Keith and C. Lord leg.; DNA voucher: CA1703; MNHN-IU- 2018-2813 GoogleMaps • 1 ♀, cl 4.1 mm; Joroveto River ; 07°49.918´S, 156°42.887´E; 18 m a.s.l.; 28 Oct. 2016; P. Keith and C. Lord leg.; MNHN-IU- 2018-2814 GoogleMaps .
VANUATU – Santo Island • 1 ♀ ovig., cl 5.6 mm; Sarataka River ; 15°30.078´S, 167°09.261´E; 25 Jul. 2003; D. Kalfatak, P. Keith and G. Marquet leg.; MNHN-IU-2015-1767 GoogleMaps . – Isabel Island • 1 specimen; Kolopakissa, Fufuna River ; 07.64456° S, 158.71918° E; 15 m a.s.l.; 25 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2504; MNHN GoogleMaps • 1 specimen; same collection data as for preceding; DNA voucher: CA2505; MNHN GoogleMaps • 1 specimen; Rakata River confluence; 07.64190° S, 158.71504° E; 27 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2513; MNHN GoogleMaps .
CEPHALOTHORAX. Antennal spine short, situated below inferior orbital angle. Pterygostomian margin rectangular round. Rostrum ( Fig. 5m View Fig ): strongly upturned, very long, 1.6–2.2 of cl, reaching far beyond distal end of scaphocerite, armed with 5–9 teeth on dorsal margin, with 1–2 apical teeth, non of them situated on carapace behind orbital margin, ventral margin with 21–27 teeth. Eyes well developed, anterior end reaching to 0.7 times length of basal segment of antennular peduncle. Antennular peduncle 0.69 (♀) – 0.88 (♂) times as long as carapace. Anterolateral angle reaching 0.32 length of second segment, second segment distinctly longer than third segment. Stylocerite reaching to 0.86 length of basal segment of antennular peduncle.
PEREIOPODS. Epipods on first four pereiopods. P1 ( Fig. 5a View Fig ): chela about 2.2–2.5 times as long as wide, movable finger 3.2–4.2 times as long as wide, 1.1–1.5 times length of palm; carpus 2.3–3.1 times as long as wide. P2 ( Fig. 5b View Fig ) more slender and longer than first pereiopod, with chela 2.5–3.1 times as long as wide; movable finger 3.7–4.9 times as long as wide, 1.2–1.6 times length of palm; carpus slender, 5.2–6.4 times as long as wide. P3 ( Fig. 5c View Fig ): stout, dactylus ( Fig. 5e View Fig ) 3.3–4.7 times as long as wide (terminal spiniform seta included), with 5–7 spiniform setae on flexor margin in addition to the terminal one; propodus 11.8–17.3 times as long as wide, 4.1–5.4 times as long as dactylus. P5 ( Fig. 5d View Fig ): dactylus ( Fig. 5f View Fig ) 4.0–5.3 as long as wide, with 31–53 spinifrom setae on flexor margin; propodus 12.9–21.1 times as long as wide, 3.7–4.5 times as long as dactylus.
ABDOMEN. Third abdominal somite with moderately convex dorsal profile. Sixth abdominal somite 0.80 as long as carapace, 1.76 times as long as fifth somite, slightly shorter than telson.
TELSON ( Fig. 5i View Fig ). 3.4–3.7 times as long as wide, with three or four pairs of dorsal spinules and one pair of dorsolateral spinules; posterior margin with a median process, distal setae short, lateral pair slightly longer than intermediate setae (mostly two pairs).
MALE PLEOPODS. Pl1 ( Fig. 5j View Fig ): endopod subtriangular, 1.5 times as long as wide, 0.17 times as long as exopod, with an appendix interna, on the subdistal outer margin, which reaches beyond distal end of endopod by a short length. Pl2 ( Fig. 5k View Fig ): appendix masculina reaching 0.57 times length of endopod; appendix interna reaching 0.71 of appendix masculina.
PRE- ANAL CARINA ( Fig. 5g View Fig ). With a spine.
UROPODAL DIAERESIS ( Fig. 5h View Fig ). With 7–10 spinules.
EGGS ( Fig. 5l View Fig ). Size: 0.40–0.53 × 0.24–0.30 mm.
In the lower course of streams, near the estuary.
Colour pattern ( Fig. 25B View Fig )
Totally translucent body with a characteristic red ventral margin on the rostrum.
This species occurs in Indonesia, the Philippines, the Solomon Islands and Vanuatu.
Our specimens fit well with the description given by Cai & Ng (2007): rostrum very long, reaching far beyond distal end of scaphocerite, strongly upturned, with presence of 0 postorbital teeth (vs 0 in Cai & Ng (2007)), 5–9 dorsal teeth (vs 4–8) and 21–27 ventral teeth (vs 21–30); P1 carpus 2.3–3.1 times as long as wide (vs 2.3–2.9); P2 carpus 5.2–6.4 times as long as wide (vs 6.2–6.7). P3 dactylus with 5–7 spiniform setae (vs 6), propodus 4.1–5.4 as long as dactylus (vs 4.1–5.1); P5 dactylus with about 31–53 spiniform setae (vs 37–44) and propodus 3.7–4.5 times as long as dactylus (vs 3.7–3.8); uropodal diaresis 7–10 (vs 9); small eggs 0.40–0.51 × 0.24–0.30 mm (vs 0.40 × 0.25 mm); appendix interna on the endopod of the male first pleopod.
The presence of an appendix interna on the endopod of the male first pleopod (vs no appendix interna) and a longer P1 carpus, 2.3–3.1 times as long as wide (vs 1.5–1.9), and P2 carpus, 5.2–6.4 times as long as wide (vs 3.2–5.1), separates C. neglecta from C. gracilirostris .
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