Caridina spathulirostris Richters, 1880

Mazancourt, Valentin De, Mennesson, Marion, Marquet, Gérard & Keith, Philippe, 2025, Revision of the species of Caridina (Decapoda: Atyidae) from the Western Indian Ocean islands with description of a new species, European Journal of Taxonomy 1007, pp. 57-86 : 64-65

Caridina spathulirostris Richters, 1880

Figs 2B , 5C

Caridina serrata Richters, 1880: 163 , pl. 17 figs 24–27 (junior homonym of Caridina serrata Stimpson, 1860 ).

Caridina spathulirostris Richters, 1880: 163 , pl. 17 fig. 28.

Caridina spatulirostris f. rectirostris Bouvier, 1925: 197.

Caridina spatulirostris f. curvirostris Bouvier, 1925: 197 .

Caridina richtersii Thallwitz, 1891: 27 (nomen novum for Caridina serrata Richters, 1880 ).

Caridina Richtersi f. typica Bouvier, 1912c: 165; 1925: 203.

Caridina apiocheles Bouvier, 1904: 134 .

Caridina apiocheles mutation Edwardsi Bouvier, 1904: 134 .

Caridina spathulirostris – Ortmann 1894b: 406 (key). — Bouvier 1905: 93 (key); 1912a: 291; 1913a: 464 (key); 1925: 197, figs 416–422. — Costa 1980: 691. — Keith et al. 2006: 60.

Caridina richtersi – Ortmann 1894b: 402 (key), 404. — Edmondson 1929: 28. — Holthuis 1954: 3. — Carpenter 1978: 350. — Costa 1980: 690. — Keith et al. 2006: 54 (incorrect spelling).

Caridina Richtersi – Bouvier 1904: 134 ; 1905: 86; 1912a 293; 1912b: 919; 1912c: 163; 1913a: 464 (key); 1913b: 184; 1914: 699; 1925: 201, figs 432–457. — Bouvier & d’Emmerez de Charmoy 1919: 317. — Woltereck 1937a: 246 (incorrect spelling).

Caridina apiocheles – Bouvier 1905: 69, 86, fig. 3. — Bordage 1909: 108, fig. 6.

Caridina apiocheles mutation Edwardsi – Bouvier 1905: 69, 87, 103, fig. 3; 1912c: 166. — Bordage 1909: 108, fig. 6.

Caridina Richtersi f. apiocheles – Bouvier 1912a: 295; 1912c: 165; 1925: 203.

Ortmannia Edwardsi – Bouvier 1912 a: 296; 1912c: 166; 1912d: 691, fig. 3; 1913a: 459 (key); 1914: 700; 1925: 265, figs 445–447, 449, 452–453, 598–605. — Bouvier & d’Emmerez de Charmoy 1919: 317. — Woltereck 1937b: 322.

Caridina richtersi var. apiocheles – Bouvier 1925: 205. — Costa 1980: 690.

Ortmannia edwardsi – Edmondson 1929: 28. — Holthuis 1954: 3. — Costa 1980: 699.

Caridina richtersi var. typica – Costa 1980: 690.

Type locality

Pamplemousses Botanical Garden, Mauritius.

Material examined

Caridina spathulirostris Richters, 1880

MAURITIUS • 1 ♀ ovig. (cl 3.9 mm), 1 ♀ (cl 5.3 mm); quartier militaire, rivière importante; 20°17.260′ S, 57°35.948′ E; 390 m a.s.l.; 10 Dec. 2005; C. R. Turner leg.; MNHN-Na 772; MNHN • 1 ♀ (cl 5.8 mm); same data as for preceding; DNA voucher: CA2165 ; MNHN-2025-125; MNHN. Caridina richtersii Thallwitz, 1891

MAURITIUS • 1 ♀ ovig. (cl 5.8 mm); quartier militaire, rivière importante; 20°17.260′ S, 57°35.948′ E; 390 m a.s.l.; 10 Dec. 2005; C. R. Turner leg.; DNA voucher: CA2166 ; MNHN-2025-126; MNHN • 1 ♂ (cl 6.5 mm); same data as for preceding; DNA voucher: CA2167 ; MNHN-2025-127; MNHN .

Distribution

Endemic to Mauritius.

Habitat

Freshwater in rivers and ponds.

Remarks

Our genetic study shows that Caridina richtersi Thallwitz, 1891 and C. spathulirostris Richters, 1880 are conspecific and we consider the former to be a junior synonym of C. spathulirostris . The specimens of this species are polymorphic in the shape of the rostrum and the chelipeds, which led to the description of numerous forms like C. spathulirostris f. rectirostris, C. spathulirostris f. curvirostris , C. richtersi f. typica, C. richertsi f. apiocheles . This kind of variability was also described in another endemic species of Caridina from the SWIO, C. similis (see Marquet & Keith, 2008).

Figures

Fig. 2. Bayesian inference phylogenetic tree obtained from the 16S marker. Numbers above branches represent Bayesian posterior probabilities, numbers under branches are Maximum Likelihood bootstraps. Letters indicate clades recognized as valid species and colored boxes are species complexes.

Fig. 5. Live coloration of the species of Atyidae from the South West Indian Ocean. A. Atyoida serrata Bate, 1888 from La Réunion (credit E. Vigneux). B. Caridina natalensis De Man, 1908 from the Seychelles (credit P. Keith). C. Caridina spathulirostris Richters, 1880 from Mauritius (credit Hoareau). D. Caridina henriettae sp. nov. from the Seychelles (credit P. Keith). E. Caridina similis Bouvier, 1904 from the Seychelles (credit Y. Zitte). F. C. typus H. Milne Edwards, 1837 from La Réunion (credit E. Vigneux). G–H. C. henriettae sp. nov. from La Réunion (credit E. Vigneux).