Mulinia bicolor Gray, 1837
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publication ID |
https://doi.org/ 10.5281/zenodo.201077 |
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DOI |
https://doi.org/10.5281/zenodo.6186983 |
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persistent identifier |
https://treatment.plazi.org/id/DE7E8786-3F2C-FF84-FF22-FCA987A9FCA4 |
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treatment provided by |
Plazi |
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scientific name |
Mulinia bicolor Gray, 1837 |
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( Figure 5 View 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 View FIGURE 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 View FIGURE 5 C); left valve with one elongated anterior lateral teeth (AII); posterior lateral tooth (PII) shorter; cardinals fused, V-shaped ( Fig. 5 View FIGURE 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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
