Didacna profundicola
| Didacna profundicola | |
|---|---|
| Illustrations of a specimen initially identified as Cardium catillus and now attributed to D. profundicola (1887) | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Cardiida |
| Family: | Cardiidae |
| Genus: | Didacna |
| Species: | D. profundicola
|
| Binomial name | |
| Didacna profundicola Logvinenko & Starobogatov, 1966
| |
Didacna profundicola is a brackish-water bivalve mollusc of the family Cardiidae, the cockles. It has a trapezoidal, thin, white or pink-white shell, up to 10–15 mm (0.39–0.59 in) in length, with flattened ribs. The species is the deepest-dwelling bivalve of the Caspian Sea. It is endemic to the middle and southern parts of the lake where it lives at depths between 75 and 475 m (246–1,558 ft).
Description
Didacna profundicola has a trapezoidal, thin, moderately convex shell, with a narrower anterior margin, 25–38 flattened radial ribs and a distinct rounded posterior ridge. It is rather small compared to other species of its genus. Its shell length is up to 10–15 mm (0.39–0.59 in), the height is up to 7–9 mm (0.28–0.35 in), and the convexity is up to 7 mm (0.28 in). The coloration is white or pink-white, with thin yellow-grey periostracum. The cardinal tooth of the left valve is distinctly curved anteriorly.[1][2][3]
Distribution and ecology
Didacna profundicola is the deepest-dwelling bivalve of the Caspian Sea. It is endemic to the middle and southern parts of the lake where it lives at depths between 75 and 475 m (246–1,558 ft). The distribution limit of the species is presumably at a depth of around 500 m (1,600 ft) or 700 m (2,300 ft).[2][4][5]
The species is only known from the modern (Holocene) fauna.[3][6]
Taxonomy
Didacna profundicola was described by Boris Mikhailovich Logvinenko and Yaroslav Igorevich Starobogatov in 1966. Together with Didacna protracta the species has been placed in the new section Protodidacna[7] which is now considered to be a tentative synonym of the genus Didacna.[8] The type locality of D. profundicola is in the central part of the Caspian Sea off Turkmenistan (39°38'N, 52°02'E) at a depth of 94 m (308 ft). The holotype is stored in the Zoological Institute of the Russian Academy of Sciences.[9][10]
The specimens described by Oscar Andreevich Grimm in 1877 under the name Cardium catillus[11] are now attributed to D. protracta and D. profundicola.[2][5]
References
- ^ Logvinenko, B. M.; Starobogatov, Y. I. (1969). "Tip Mollyuski. Mollusca" [Phylum Molluscs. Mollusca]. In Birshteyn, Y. A.; Vinogradov, L. G.; Kondakov, N. N.; Kuhn, M. S.; Astakhova, T. V.; Romanova, N. N. (eds.). Atlas bespozvonochnykh Kaspiyskogo morya [Atlas of the Invertebrates of the Caspian Sea] (in Russian). Moscow: Pishchevaya Promyshlennost. p. 328.
- ^ a b c Kijashko, P. V. (2013). "Mollyuski Kaspiyskogo morya" [Molluscs of the Caspian sea]. In Bogutskaya, N. G.; Kijashko, P. V.; Naseka, A. M.; Orlova, M. I. (eds.). Identification keys for fish and invertebrates of the Caspian Sea (in Russian). Vol. 1. Fish and molluscs. St. Petersburg; Moscow: KMK Scientific Press Ltd. p. 356. ISBN 978-5-87317-932-9.
- ^ a b ter Poorten 2024, p. 160.
- ^ Tarasov, A. G. (1997). "Rakoviny mollyuskov iz psevdoabissali Kaspiya" [Shells of molluscs from the Caspian pseudabyssal]. Doklady Rossiyskoy Akademii nauk (in Russian). 358 (1): 91–92.
- ^ a b Vinarski, M. V.; Kijashko, P. V.; Andreeva, S. I.; Sitnikova, T. Y.; Yanina, T. A. (2024). "Atlas and catalogue of the living mollusks of the Aral and Caspian Seas". Vita Malacologica. 23: 1–124. ISBN 978-3-948603-50-2.
- ^ Nevesskaja, L. A. (2007). "History of the genus Didacna (Bivalvia: Cardiidae)". Paleontological Journal. 41 (9): 861–949. Bibcode:2007PalJ...41..861N. doi:10.1134/s0031030107090018.
- ^ Logvinenko, B. M.; Starobogatov, Y. I. (1966). "Novyye dvustvorchatyye mollyuski iz kaspiyskoy profundali" [New bivalve molluscs from the Caspian profundal]. Biologicheskie Nauki (in Russian). 2: 13–16.
- ^ ter Poorten 2024, p. 156.
- ^ Vinarski, M. V.; Kantor, Y. I. (2016). Analytical catalogue of fresh and brackish water molluscs of Russia and adjacent countries. Moscow: A. N. Severtsov Institute of Ecology and Evolution of Russian Academy of Sciences. p. 72. ISBN 978-5-9908840-7-6.
- ^ Wesselingh, F. P.; Neubauer, T. A.; Anistratenko, V. V.; Vinarski, M.; Yanina, T.; ter Poorten, J. J.; Kijashko, P.; Albrecht, C.; Anistratenko, O. Y.; D'Hont, A.; Frolov, P.; Gándara, A. M.; Gittenberger, A.; Gogaladze, A.; Karpinsky, M.; Lattuada, M.; Popa, L.; Sands, A. F.; van de Velde, S.; Vandendorpe, J.; Wilke, T. (2019). "Mollusc species from the Pontocaspian region – an expert opinion list". ZooKeys (827): 31–124. Bibcode:2019ZooK..827...31W. doi:10.3897/zookeys.827.31365. PMC 6472301. PMID 31114425.
- ^ Grimm, O. A. (1877). Kaspijskoe more i ego fauna [The Caspian Sea and its Fauna]. Trudy Aralo-Kaspiiskoi Ekspeditsii (in Russian). Vol. 2 (2). St. Petersburg: St. Petersburg Society of Naturalists. pp. 58–62.
Cited texts
- ter Poorten, J. J. (2024). A taxonomic iconography of living Cardiidae. Harxheim: ConchBooks. ISBN 978-3-948603-48-9.