Caridina variabilirostris, Mazancourt & Marquet & Keith, 2018

Mazancourt, Valentin de, Marquet, Gerard & Keith, Philippe, 2018, Caridina variabilirostris (Crustacea: Decapoda: Atyidae), a new species of freshwater shrimp from Pohnpei (Micronesia), European Journal of Taxonomy 453, pp. 1-16 : 7

Caridina variabilirostris sp. nov.

urn:lsid:zoobank.org:act:63F36D6C-9049-4D5E-902E-D38A3BCA3B0A

Figs 3–4

Etymology

The new species is named variabilirostris for its variable rostrum length.

Material examined

Holotype

POHNPEI (Station 8): ♂, cl 3.5 mm, Nanpil river , 06°54.252′ N, 158°11.491′ E, 180 m a.s.l., 13 Mar. 2012 (MNHN-IU-2018-231, DNA: CA 1397).

Paratypes

POHNPEI – Nanpil river ( Station 1): 1 ♂, cl 3.2 mm, 06°55.242′ N, 158°12.265′ E, 127 m a.s.l., 9 Mar. 2012, (MNHN-IU-2018-232); 1 ♀, cl 4.6 mm, same data as for preceding (MNHN-IU-2018-233); 1 ♀ ovig., cl 4.1 mm, same data as for preceding (MNHN-IU-2018-234, DNA: CA 1396). – Nanpil river ( Station 3): 1 ♂, cl 3.4 mm 06°55.111′ N, 158°12.878′ E, 52 m a.s.l., 9 Mar. 2012 ( MNHN- IU-2018-235); 1 ♀ ovig., cl 4.5 mm, same data as for preceding (MNHN-IU-2018-236). – Lehn Mesi river ( Station 5): 2 ♀♀, cl 4.7 mm (MNHN-IU-2018-237) and 4.8 mm (MNHN-IU-2018-238); 1 ♀ ovig., cl 4.7 mm (MNHN-IU-2018-239), 06°51.107′ N, 158°11.896′ E, 139 m a.s.l., 10 Mar. 2012. – Senipehn river ( Station 7): 1 ♀, 06°51.906′ N, 158°16.010′ E, 95 m a.s.l., 12 Mar. 2012, cl 4.4 mm (MNHN-IU-2018-240); 2 ♀♀, ovig., cl. 4.1 mm (MNHN-IU-2018-241) and 4.5 mm ( MNHN- IU-2018-242), same data as for preceding. – Nanpil river ( Station 8): 3 ♂♂, cl 3.4 mm ( MNHN- IU-2018-243, DNA: CA 1399), 3.5 mm (MNHN-IU-2018-244) and 3.6 mm (MNHN-IU-2018-245, DNA: CA 1398), 06°54.252′ N, 158°11.491′ E, 180 m a.s.l., 13 Mar. 2012; 1 ♀, cl 4.4 mm ( MNHN- IU-2018-246), same data as for preceding; 1 ♀ ovig., cl 5.1 mm (MNHN-IU-2018-247), same data as for preceding. – Nanpil estuary ( Station 9): 2 ♂♂, cl 2.2 mm (MNHN-IU-2018-248, DNA: CA 1401) and 2.7 mm (MNHN-IU-2018-249), 06°56.609′ N, 158°13.550′ E, 5 m a.s.l., 13 Mar. 2012; 2 ♀♀, 3.5 mm (MNHN-IU-2018-250, DNA: CA 1400) and 3.7 mm (MNHN-IU-2018-251), same data as for preceding; 2 ♀♀ ovig., cl 4.0 mm (MNHN-IU-2018-252) and 4.4 mm (MNHN-IU-2018-253), same data as for preceding. – Mahnd river ( Station 10): 2 ♂♂, cl 2.9 mm (MNHN-IU-2018-254) and 3.3 mm (MNHN-IU-2018-255), 06°50.221′ N, 158°17.212′ E, 107 m a.s.l., 14 Mar. 2012; 1 ♀ ovig., cl. 4.3 mm (MNHN-IU-2018-256), same data as for preceding.

Figures

Fig. 3. Caridina variabilirostris sp. nov., showing the variation in rostrum length related to the altitude (ac), drawings made from different specimens. a, m–n. ♂, cl 3.5 mm (MNHN-IU-2018-244). a. Rostrum. m. First pleiopod. n. Second pleiopod. b. ♀, cl 5.6 mm, rostrum (MNHN-IU-2018-252). c, j, o. ♀, cl 4.0 mm (MNHN-IU-2018-253) c. Rostrum. j. Uropodial diaeresis. o. Eggs. d–i, k. ♀, cl 3.5 mm (MNHN-IU-2018-250). d. First pereopod. e. Second pereopod. f. Third pereopod. g. Dactylus of third pereopod. h. Fifth pereopod. i. Dactylus of fifth pereopod. k. Telson. l. ♀, cl 4.3 mm, pre-anal carina (MNHN-IU-2018-256). of third pereopod. h. Fifth pereopod. i. Dactylus of fifth pereopod. k. Telson. l. ♀, cl 4.3 mm, pre-anal carina (MNHN-IU-2018-256).

Fig. 4. Caridina variabilirostris sp. nov., showing drawings made from different specimens: a. ♂, cl 3.5 mm, general appearance (MNHN-IU-2018-244). c–d. ♀, cl 3.5 mm (MNHN-IU-2018-250). c. Right mandible. d. First maxilla. b, e–h. ♀, cl 4.8 mm, (MNHN-IU-2018-238). b. Left mandible. e. Second maxilla. f. Third maxilliped. g. Second maxilliped. h. First maxilliped.