Mulinia bicolor Gray 1837
Creators
Description
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 (3a & 3b) 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.
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Related works
- Cites
- Figure: 10.5281/zenodo.201082 (DOI)
- Is part of
- Journal article: 10.5281/zenodo.201077 (DOI)
- Journal article: http://publication.plazi.org/id/2247FFFE3F29FF82FFB5FF8E8530FFD4 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/DE7E87863F2CFF84FF22FCA987A9FCA4 (URL)
Biodiversity
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.