Mulinia bicolor Gray 1837

• Main Authors: Signorelli, Javier H., Pastorino, Guido
• Format: Text
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Veneroida; Mactridae; Mulinia; Mulinia bicolor; Bering Strait; Pacific; De la Costa; Lamarck; Gonzalez; Cape Horn; Guido; Ryen
• Online Access: https://dx.doi.org/10.5281/zenodo.6186983; https://zenodo.org/record/6186983

Mulinia bicolor Gray, 1837 (Figure 5) Mulinia bicolor Gray, 1837: 375; Hanley, 1843: 34, pl. 10, fig. 31; Dall, 1909: 274; Bernard, 1983: 40. Mactra bicolor Gray, 1837. d’Orbigny, 1846: 510, pl. 78 fig. 18; Hupé in Gay, 1854: 348, Philippi, 1893: 11, pl. 3, fig. 9. Diagnosis. Shell subcircular, large, inflated; posterior area not defined by line or keel; umbos inflated. Description. Shell trigonal, subcircular; maximum length up to 12, 25 cm; anterior and posterior ends rounded; ventral margin curved. External surface smooth, with yellow to brownish periostracum (Fig. 5 A–B). Right hinge with two anterior (AI & AIII) and two posterior (PI & PIII) lateral teeth; anterior teeth similar in length, dorsal tooth stronger than ventral one; ventral posterior lateral tooth more elongated than dorsal; two unfused cardinal teeth (3 a & 3 b) flanked by accessory lamella (Fig. 5 C); left valve with one elongated anterior lateral teeth (AII); posterior lateral tooth (PII) shorter; cardinals fused, V-shaped (Fig. 5 D). Type material. Holotype (NHM 196323), one left valve. Type locality. Unknown, not indicated in the original description. Other material examined. Chile . South America (NHM 1843.661, 2; 68.7.6.22, 1 1962.1090, 3); Chile (AMNH 34042, 2); Talcahuano, Chile (MACN 13804, 8 valves with periostracum). Distribution. Caldera to Talcahuano, Chile. Remarks. The distribution of this species was mentioned by Soot-Ryen (1959) and Osorio et al. (1979), and later confirmed by González et al. (2002). Mulinia bicolor is a Recent valid species present on the south-central coast of Chile. This is one of the largest species of the genus (holotype length: 12.25 cm). Despite its large size, it is a very rare species judged by its presence in the collections studied (only eight specimens were analyzed) M. bicolor was included by Gray (1837) in a group of taxa with the anterior end delimited by a line. The type material housed at NHM agrees with d´Orbigny’s (1846) description. In addition, the French author pointed out the larger size of this form compared with the type material of Mulinia edulis and M. byronensis . The illustrations labeled as M. bicolor published by Hanley (1843: 34, pl. 10, fig. 31) and Philippi (1893: 11, pl. 3, fig. 9) are not adequate to confirm the taxonomic status of Gray species. : Published as part of Signorelli, Javier H. & Pastorino, Guido, 2011, Revision of the Magellanic Mactridae Lamarck, 1809 (Bivalvia: Heterodonta), pp. 47-67 in Zootaxa 2757 on pages 52-53, DOI: 10.5281/zenodo.201077 : {"references": ["Gray, J. E. (1837) A synoptical catalogue of the species of certain tribes of genera of shells contained in the collection of the British Museum. The Magazine of Natural History, n. s. 1, 370 - 376.", "Dall, W. H. (1909) Report on a collection of shells from Peru, with a summary of the littoral marine Mollusca of the Peruvian zoological Province. Proceedings of the United States National Museum, 37, 147 - 294.", "Bernard, F. R. (1983) Catalogue of the living Bivalvia of the eastern Pacific Ocean: Bering Strait to Cape Horn. Canadian Special Publication of Fisheries and Aquatic Sciences, 61, 1 - 102.", "Philippi, R. A. (1893) Las especies chilenas del genero Mactra. Anales del Museo Nacional de Chile, Zoologia, 1 - 15.", "Soot-Ryen, T. (1959) Reports of the Lund University Chile Expedition 1948 - 49. Pelecypoda. Lund University Arsskrift, 2 nd serie, 55 (6), 1 - 86.", "Osorio, C., Atria, J. & Mann, S. (1979) Moluscos Marinos de importancia economica en Chile. Biologia Pesquera (Chile), 11, 3 - 47.", "Gonzalez, C., Pia Mena, C., Gallardo, M. H. & Clasing, E. (2002) Variabilidad genetica en los miembros del genero Mulinia (Gray, 1837) (Bivalvia, Mactridae) a lo largo de la costa chilena. Ciencia y Tecnologia Marina, 25, 147 - 156."]}