Caridina tupaia de Mazancourt, Marquet & Keith, 2019

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 : 52-53

Caridina tupaia de Mazancourt, Marquet & Keith, 2019

Figs 2S , 16

Material examined

SOLOMON ISLANDS – Choiseul Island • 1 ♂, cl 3.2 mm; Creek 2; 06°59.085´S, 156°47.454´E; 93 m a.s.l.; 14 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU- 2018-2877 • 1 ♂, cl 3.4 mm; same collection data as for preceding; MNHN-IU- 2018-2878 • 1 ♂, cl 3.6 mm; same collection data as for preceding; MNHN-IU- 2018-2879 • 1 ♂, cl 3.6 mm; same collection data as for preceding; MNHN-IU- 2018-2880 • 1 ♂, cl 3.9 mm; same collection data as for preceding; MNHN- IU- 2018-2881 • 1 ♀, cl 3.5 mm; same collection data as for preceding; DNA voucher: CA1927; MNHN- IU- 2018-2882 • 1 ♀ ovig., cl 4.5 mm; same collection data as for preceding; MNHN-IU- 2018-2884 • 1 ♀ ovig., cl 5.2 mm; Creek 1; 06°59.085´S, 156°47.454´E; 132 m a.s.l.; 14 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU- 2018-2885 . – Malaita Island • 1 ♂, cl 3.6 mm; Tanana River ; 09°17.383´S, 167°07.012´E; 276 m a.s.l.; 16 Jun. 2015; D. Boseto leg.; DNA voucher: CA1508; MNHN-IU- 2018-2886 • 1 ♂, cl 3.1 mm; small tributary close to Nunubala Camp ; 09°00.056´S, 160°51.893´E; 23 Jun. 2015; 315 m a.s.l.; D. Boseto leg.; MNHN-IU- 2018-2887 .

Description

See de Mazancourt et al. (2019b).

Habitat

This species is largely rheophile and prefers fresh and well-oxygenated waters from the lower course to the higher course of rivers.

Colour pattern

The live general colour of the body is yellowish and slightly translucent. Numerous red spots are visible all over the body. Sometimes, a lighter longitudinal dorsal band is present stretching from the rostrum to the telson (see de Mazancourt et al. 2019b).

Distribution

This species seems to have a wide distribution: Solomon Islands (Malaita and Choiseul), Fiji, Samoa, Cook (Rarotonga) and French Polynesia (Society and Austral archipelagos).

Remarks

Recently de Mazancourt et al. (2019b) have revised the species of the C. weberi group from Polynesia. Contrary to what Edmondson (1935) wrote, C. weberi does not occur in Polynesia but four other species of the C. weberi complex. Among these species, one also occurs in the Solomon Islands: C. tupaia . Curiously, although the dorsal teeth of the rostrum are situated all along its length, with sometimes 1–3 of them situated on the carapace behind the orbital margin in French Polynesia, in Samoa (Upolu) and the Cook Islands, specimens from the Solomon Islands have dorsal teeth situated considerably anterior to the orbital margin with none of them situated on the carapace behind the orbital margin (see Fig. 16 ).

Figures

Fig. 2. Bayesian inference phylogenetic tree of the species studied. Numbers above branches are Bayesian posterior probabilities, numbers under branches are Maximum Likelihood bootstrap values. Results of the three species delimitation methods are indicated by the black bars on the right of the tree. Each bar represents a species recognized by the analysis.

Fig. 16. Caridina tupaia de Mazancourt, Marquet & Keith, 2019. Cephalothorax. MNHN-IU-2018 -2884.