Atyopsis spinipes (Newport, 1847)

Mazancourt, Valentin de, Marquet, Gérard & Keith, Philippe, 2024, An Integrative Taxonomic Revision of the Freshwater Atyid Shrimps (Crustacea: Decapoda: Caridea) of Micronesia, Diversity 16 (200), pp. 1-31 : 7

Atyopsis spinipes (Newport, 1847)

Figures 3A and 9A

- Atya spinipes Newport 1847: 159 [type locality: Philippine Islands];

- Atyopsis spinipes —Chace 1983 [44]: 35, Figures 20–22.

Material examined

PALAU: Babeldaob Island . Tabechedingriver , station 1 , 27 February 2011, 07 ◦ 27.169 ′ N, 134 ◦ 31.748 ′ E, observed only; Ngerchokl river , station 2 , 27 February 2011, 07 ◦ 36.527 ′ N, 134 ◦ 36.958 ′ E, observed only; Tireloich river , station 3 , 07 ◦ 41.417 ′ N, 134 ◦ 37.754 ′ E, 28 February 2011, coll. M. Castelin, P. Keith, P. Gerbeaux, G. Marquet, and L. Taillebois, observed only; Ngardmau waterfall , station 7 , 2 March 2011, 07 ◦ 35.482 ′ N, 134 ◦ 35.573 ′ E, observed only; USNM 105280 : 4 ♀, cl 7.3 mm –11.0 mm, south fork of Arakitaoch stream , station 170A , 26 November 1956, coll. H.A. Fehlmann; USNM 190993 : 1 ♀, cl 12.0 mm, Metengakakumer river , station 2-MR- 4-05 , 13 February 1973, coll. G. Bright. Tissue only: CA1861 and CA1862, no locality data.

Koror Island . USNM 104899 : 1 ♀, cl 8.3 mm, station 216, 7 ◦ 20.424 ′ N, 134 ◦ 29.642 ′ E, 11 October 1955, coll. H.A. Fehlmann.

FEDERATED STATES OF MICRONESIA: Pohnpei Island . Nanpil river station 1 , 9 March 2012, 127 m a.s.l., 06 ◦ 55.242 ′ N, 158 ◦ 12.265 ′ E; Nanpil river station 2 , 9 March 2012, 93 m a.s.l., 06 ◦ 54.498 ′ N, 158 ◦ 13.270E, observed only; Nanpil river station 3 , 9 March 2012, 52 m a.s.l., 06 ◦ 55.111 ′ N, 158 ◦ 12.878 ′ E, observed only; Lehn Mesi river station 1 , 10 March 2012, 197 m a.s.l., 06 ◦ 51.055 ′ N, 158 ◦ 10.890 ′ E, observed only; Lehn Mesi river station 2 , 10 March 2012, 139 m a.s.l., 06 ◦ 51.107 ′ N, 158 ◦ 11.396 ′ E, observed only; Senipehn river station 2 , 12 March 2012, 95 m a.s.l., 06 ◦ 51.906 ′ N, 158 ◦ 16.010 ′ E, observed only; Nanpil river station 5 , 5 m a.s.l., 06 ◦ 56.683 ′ N, 158 ◦ 13.550 ′ E, observed only; Mahnd river , 14 March 2012, 107 m a.s.l., 06 ◦ 50.609 ′ N, 158 ◦ 17.212 ′ E, observed only; unnamed river 1 estuary, 5 m a.s.l., 06 ◦ 51.120 ′ N, 158 ◦ 17.854 ′ E, observed only; Senipehn river station 3 , 119 m a.s.l., 06 ◦ 51.795 ′ N, 158 ◦ 15.622 ′ E, observed only, M. Castelin, P. Keith, P. Gerbeaux, G. Marquet and L. Taillebois. Tissue only: CA1873 CA1872 and CA1874, no locality data, coll. M. Castelin, P. Keith, P. Gerbeaux, G. Marquet, and L. Taillebois.

Short diagnosis

Body pigmented, eyes well-developed. Rostrum not strongly compressed laterally, dorsal carina typically unarmed, ventral margin with two–six discrete teeth, and anterior margin of carapace armed with antennal spine. Pterygostomian margin sharply acute. first and second pereopods with chelae monomorphic (without palm); fingers tipped with brushes of long setae adapted for filter feeding. Third pereopods of large males with prominent spur on merus.

Distribution

Pacific, extending from the Philippines and Indonesia to Samoa.

Habitat

This species prefers fresh and fast-flowing waters. Its biotope is characterized by rocky walls under waterfalls, where individuals aggregate in great numbers.

Figures

Figure 3. Phylogenetic tree of the atyid species from Micronesia obtained by Bayesian inference from the 16S rRNA. Numbers above branches indicate Bayesian posterior probabilities, numbers under branches indicate maximum likelihood bootstraps. Letters A–K for the clades refer to the species listed in the taxonomic account.

Figure 9. Coloration in life. (A) Atyopsis spinipes from Pohnpei (P. Keith); (B) Atyoida chacei sp. nov. from Palau (H. Ketebengang, inaturalist.org); (C) Caridina ponapensis sp. nov. from Pohnpei (P. Gerbeaux); (D) Caridina rintelenorum sp. nov., paratype MNHN-IU-2024-463 from Isabel, Solomon Islands (P. Keith).