Monodacna colorata

Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine & Wilke, Thomas, 2019, Mollusc species from the Pontocaspian region - an expert opinion list, ZooKeys 827, pp. 31-124 : 50-51

Monodacna colorata (Eichwald, 1829)

*1829 G. [lycymeris] colorata Eichwald: 279-280, pl. 5, fig. 4a, b.

1838 Adacna colorata m. - Eichwald: 169-170.

?1838 Monodacna pontica Eichwald: 168-169.

1926 Monodacna colorata var. ialpugensis Borcea: 452, pl. 15, fig. 16.

1926 Monodacna colorata var. angusticostata Borcea: 452-453, pl. 15, figs 27, 28, pl. 16, figs 90, 91, pl. 18, figs 143, 169, 173, pl. 21, fig. 7.

1926 Adacna Luciae Borcea: 469-471, pl. 18, figs 146, 148-149, 151-153, pl. 21, figs 8, 9.

1952 Monodacna colorata (Eichwald, 1829). - Zhadin: 351, fig. 328.

?1972 Hypanis caspia grossui Scarlato and Starobogatov: 214, pl. 4, fig. 1a, b.

1973 Hypanis caspia grossui Scarlato & Starobogatov, 1971. - Grossu: 140, text fig. 21, pl. 1, fig. 8.

1973 Hypanis angusticostata angusticostata Borcea, 1926. - Grossu: 141, pl. 1, fig. 12.

1973 Hypanis luciae Borcea, 1926. - Grossu: 138, text fig. 18.

1973 Hypanis ialpugensis Borcea, 1926. - Grossu: 142, fig. 24, pl. 1, figs 9, 10.

1973 Hypanis colorata Eichwald, 1829. - Grossu: 142-143, fig. 25, pl. 1, figs 13-15.

1973 Hypanis pontica Eichwald, 1838. - Grossu: 143, fig. 26, pl. 1, fig. 11.

2006a Hypanis colorata (Eichwald, 1829). - Munasypova-Motyash: 42-43.

?2006a Hypanis pontica (Eichwald, 1838). - Munasypova-Motyash: 43-44.

?2006a Hypanis angusticostata angusticostata (Borcea, 1926). - Munasypova-Motyash: 44.

2009 Monodacna pontica Eichwald, 1838. - Popa et al.: 10, text fig. 2.

2009 Monodacna colorata Eichwald, 1829. - Popa et al.: 10-11, text fig. 3.

2012 Hypanis colorata (Eichwald, 1829). - Popa et al.: 153, 154.

2012 Hypanis angusticostata (Borcea, 1926). - Popa et al.: 153, 154.

2013 Adacna (Monodacna) colorata (Eichwald, 1829). - Kijashko in Bogutskaya et al.: 383, fig. 158.

2016 Adacna (Monodacna) angusticostata (Borcea, 1926). - Vinarski and Kantor: 66.

2016 Adacna (Monodacna) grossui (Scarlato et Starobogatov, 1972). - Vinarski and Kantor: 67.

2016 Adacna (Monodacna) ialpugensis (Borcea, 1926). - Vinarski and Kantor: 68.

Status. Pontocaspian species, native to Black Sea Basin (including lower Danube River), invasive in Caspian Sea and Volga River.

Type locality. "Hypanin fluvium, ad nigrum usque mare" [Lower course of the Yuzhnyi Bug River, all the way to the Black Sea, Ukraine].

Distribution. Native to all Black Sea Basin Pontocaspian habitats and lower courses of adjacent rivers such as the Danube, Dnieper, and Dniester; invasive in Caspian Sea Basin and lower Volga, as well as Lake Balkhash (Kazakhstan). Occurs hundreds of kilometres upstream in major tributaries (Danube: Popa et al. 2009; recent observations in Volga River upstream Volgograd by MV and AFS).

Taxonomic notes. Monodacna colorata appears to be a morphologically very variable species. Here, we propose to synonymise several local Black Sea species with this taxon. Given the difficulty to distinguish relatively flat shells typically associated with M. colorata from the more convex shells typically associated with M. pontica in, e.g., Lake Razim (Romania) and the apparent lack of genetic differentiation of convex specimens from M. colorata we assume that M. pontica is a synonym of M. colorata . Shell differences have been attributed to substrate differences. Further investigations to confirm the synonymy are required. Monodacna angusticostata was synonymised by Popa et al. (2012) based on molecular evidence, even though some morphological distinction was reported from M. colorata , which they attributed to differential habitat preference (sediment type).

Conservation status. Not assessed.