Caridina brevidactyla Roux, 1919

Figs 2K, 25D

Caridina nilotica var. brevidactyla J. Roux, 1919: 320–321 .

Caridina nilotica var. brevidactyla – J. Roux 1926: 204–206.

Caridina brevidactyla – Cai & Ng 2001: 671, fig. 5.— de Mazancourt et al. 2018c: 1435–1438, fig. 5; 2019a: 166, 169–170.

Not Caridina nilotica var. brachydactyla form peninsularis Edmondson, 1935: 5, fig. 1g–k.

Material examined

SOLOMON ISLANDS – Choiseul Island • 1 ♀, cl 5.3 mm; Gu’ma River; 07°01.764´S, 156°49.899´E; 50 m a.s.l.; 17 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2018-168 • 1 ♀ ovig., cl 5.0 mm; Lokasereke River; 06°58.024´S, 156°47.861´E; 13 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2018-169 • 1 ♀ ovig., cl 5.1 mm; same collection data as for preceding; MNHN-IU-2018-170 • 1 ♀ ovig., cl 5.7 mm; same collection data as for preceding; MNHN-IU- 2018-171 • 1 ♀ ovig., cl 5.8 mm; same collection data as for preceding; DNA voucher: CA1345; MNHN-IU-2018-172 • 1 ♀, cl 4.4 mm; Lopakare River; 07°01.834´S, 156°45.789´E; 21 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2018-173 • 1 ♂, cl 3.3 mm; same collection data as for preceding; MNHN-IU-2018-174 • 1 ♀ ovig., cl 5.0 mm; Vorama River; 06°58.687´S, 156°46.746´E; 15 m a.s.l.; 11 Oct. 2014; P. Gerbeaux, P. Keith and G. Marquet leg.; MNHN-IU-2018-175 • 1 ♀ ovig., cl 5.3 mm; same collection data as for preceding; MNHN-IU-2018-176 • 1 ♂, 3.1 mm; same collection data as for preceding; MNHN-IU-2018-177 . – Kolombangara Island • 1 ♀, cl 4.2 mm; Lodumoe River; 07°50.961´S, 157°04.320´E; 16 Nov. 2015; 0 m a.s.l.; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU-2018-178 • 1 ♀ ovig., cl 4.9 mm; same collection data as for preceding; DNA voucher: CA1500; MNHN-IU-2018-179 • 1 ♀ ovig., cl 3.7 mm; Vanga River; 07°54.825´S, 156°57.762´E; 18 Nov. 2015; 5 m a.s.l.; P. Keith, C. Lord and G. Marquet leg.; MNHN-IU-2018-180 • 1 ♀ ovig., cl 3.9 mm; same collection data as for preceding; MNHN-IU-2018-181 • 1 ♂, cl 3.8 mm; same collection data as for preceding; MNHN-IU-2018-182 . – Vella Lavella Island • 1 ♀ ovig., cl 4.6 mm; Maravari River; 07°51.703´S, 156°41.748´E; 31 Oct. 2016; P. Keith and C. Lord leg.; MNHN-IU-2018-183 • 1 ♂; same collection data as for preceding; MNHN-IU-2018-184 • 1 ♀ ovig., cl 4.0 mm; Wariassi River; 29 Oct. 2016; P. Keith and C. Lord leg.; MNHN-IU-2018-186 • 1 ♂, cl 4.2 mm; same collection data as for preceding; MNHN-IU-2018-187 . – Isabel Island • 1 specimen; Kupikolo, Rapa River; 07°28.527´S 158°17.105´E; 0–7 m a.s.l.; 23 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2500; MNHN • 1 specimen; same collection data as for preceding; DNA voucher: CA2501; MNHN • 1 specimen; Kolopakissa River; 07°35.377´S, 158°39.854´E; 40 m a.s.l.; 26 Oct. 2019; P. Keith, C. Lord, R. Causse and D. Boseto leg.; DNA voucher: CA2507; MNHN • 1 specimen; same collection data as for preceding; DNA voucher: CA2508; MNHN • 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: CA2514; MNHN .

Remarks

de Mazancourt et al. (2018c) recently designated a lectotype for C. brevidactyla Roux, 1919 and redescribed it in detail. This species is now known from Indonesia (Aru Island, Halmahera), Papua New Guinea (New Britain), Solomon Islands (Choiseul, Kolombangara, Vella Lavella, Isabel), Vanuatu (Efate, Epi, Malekula and Santo), New Caledonia and Fiji. This species is encountered in the lower part of rivers, sometimes in brackish conditions near the estuary.