Caridina variabilis de Mazancourt, Marquet, Rogers & Keith, 2018

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 : 23

Caridina variabilis de Mazancourt, Marquet, Rogers & Keith, 2018

Figures 3K and 10C,D .

- Caridina variabilis de Mazancourt, Marquet, Rogers, and Keith, 2018b: 43, Figure 4 [type locality: Palau, Babeldaob Island, TabechedingRiver, 07 ◦ 27.169 ′ N, 134 ◦ 31.748 ′ E].—de Mazancourt et al., 2018 [9]: 6, Figure 2 ; 2019 [47]: 167, Figures 2 –5; 2020 [43]: 20, 31;

- Caridina brachydactyla uncata de Mazancourt, Marquet, Rogers, and Keith, 2018: 40 (nomen nudum);

- Caridina nilotica var. brachydactyla — Bouvier, 1925 [7]: 155 (part, specimens from Marianas);

- Caridina weberi — Leberer and Nelson, 2001 [19]: 389;

- Caridina brachydactyla — Bright, 1989 [23]: 35.—Leberer and Cai, 2003 [18]: 354;

- Caridina mertoni — Leberer and Cai, 2003 [18]: 354;

- Caridina longirostris — Leberer and Nelson, 2001 [19]: 389;

Material examined

See [9].

Distribution

This species occurs only in Guam and Palau [9].

Remarks

Holthuis (year unknown) named specimens from Palau, based on material collected by H. A. Fehlmann on the 30 October 1956 from Arakitaoch stream and deposited in USNM as C. brachydactyla uncata (“holotype” USNM 105430, “paratypes” UNSNM 105434) but never described or published this taxon. This species was previously confused with C. brachydactyla De Man, 1908 or C. mertoni Roux, 1911 , depending on its variable morphology (see [9]).

Figures

Figure 2. Rivers and sites surveyed in Babeldaob, Guam, and Pohnpei (dots: prospected sites).

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 4. Atyoida chacei sp. nov. (a) first pereiopod of female; (b) first pereiopod of male; (c) second pereiopod of female; (d) second pereiopod of male; (e) third pereiopod; (f) dactylus of third pereiopod; (g) fifth pereiopod; (h) dactylus of fifth pereiopod; (i) uropodal diaeresis; (j) pre-anal carina; (k) telson; (l) male first pleopod, endopod; (m) male second pleopod; (n) undeveloped eggs; (o) cephalothorax; (p,q) rostrum variations. Holotype MNHN-IU-2024-439 (DNA: 1858): i, l, m, and p. Paratypes: MNHN-IU-2024-440 (DNA: CA1859): b, d, and q; MNHN-IU-2024-442 (DNA: CA1860): e, f, j, k, and o; MNHN-IU-2024-446 (DNA: CA1871): a, c, g, h, and n.

Figure 10. (A) Caridina appendiculata from Pohnpei (P. Keith); (B) Caridina variabilirostris from Pohnpei (P. Gerbeaux); (C) Caridina variabilis from Guam (M. Sasazuka, One’s habitat); (D) Caridina variabilis from Babeldaob (P. Keith).