Mulinia byronensis 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 byronensis; Argentina; Lamarck; Williamson; Ushuaia; Gauthier; Guido; Valparaíso; lota; Tierra del Fuego
• Online Access: https://dx.doi.org/10.5281/zenodo.6186985; https://zenodo.org/record/6186985

Mulinia byronensis Gray, 1837 (Figures 6–7) Mulinia byronensis Gray, 1837: 376, fig. 33; Hanley, 1843: 35, pl. 10, fig. 38; Adams & Adams, 1856: 380; Dall, 1909: 274, 286–287; Carcelles & Williamson, 1951: 343. Mactra byronensis d´Orbigny, 1846: 511; Reeve, 1854: pl. 15, fig. 77; Weinkauff, 1884: 101, pl. 34, figs. 3–4. Mulinea byronensis Gray. Conrad, 1868: 31. Mactra byroni Weinkauff, 1884: 101 ( nomen nudum ). Mactra byroneana Weinkauff, 1884: 101 ( nomen nudum ). Mactra jousseaumi Mabille & Rochebrune, 1889: 106. Mactra pencana Philippi, 1893: 8, pl. 1, fig. 2. Mactra lotensis Philippi, 1893: 10, pl. 3, fig. 8. Diagnosis. Shell oval, elongated, dorsal margin delimited by a line from umbo to posterior end; short lateral teeth close to cardinals. Description. Shell oval to trigonal, equilateral, compressed; dorsal margins curved; line from umbo to posterior end very clear; ventral margin curved; external surface smooth with irregular growth lines, brownish periostracum (Fig. 6 A–H). Umbos prosogyrous, not inflated. Internally white with V-shaped pallial sinus of 1 / 3 of shell length; internal ligament in trigonal chondrophore ventrally developed. Right hinge with two anterior and two posterior lateral teeth, strong, each with one rounded cusp (Fig. 7 A); two cardinal teeth on anterior side of chondrophore, posterior cardinal vertically oriented; Left valve with one anterior and one posterior lateral teeth (Fig. 7 B), anterior cardinal tooth oblique in relation to dorsal margin. Ultrastructure of two layers, internal with cross lamellar complex and external with simple cross lamellar structure (Fig. 7 C–D). Type material. [ M. byronensis ] NHM 196324, 5 syntypes (figs. 6 A–H); [ M. pencana ] MNHNC (unnumbered), holotype from Talcahuano, Chile (figs. 6 I –K); [ M. jousseaumi ] MNHN (unnumbered), one syntype from Orange Bay (figs. 6 L–M); [ Mactra lotensis ] MNHNC (unnumbered), holotype from Lota, Chile (figs. 6 N–O). Type locality. “South America ”. Other material examined. Peru . Peru (NHM 1563, 2 complete valves). Chile . Valparaíso, Chile (MLP 5355, 3 valves); Concepción, Chile (NHM s/n°, 4 valves); Talcahuano, Chile (MACN 13804, coll. in 1923, 26 valves); Puerto El Hambre (AMNH 34041, 1 valve); Magellanic Strait (MLP 1848, 1 valve; MZUSP 13060, 3 valves; AMNH 34039, 1 valve; NHM 79.10.15.68, coll. by Coppinger on H.M.S. Alert). Argentina . Ushuaia, Tierra del Fuego (MZUSP 22298, 2 valves, 1981). Distribution. Peru to Ushuaia, Argentina. Remarks. Weinkauff (1884) mentioned that Gray should have named this species Mulinia byroni or byroneana . However, these nominal taxa must be considered unjustified emendations. Mulinia byronensis is characterized by a more elongated shell than M. edulis . The posterodorsal line that delimits the posterior area in M. byronensis is absent in M. typica . Mactra jousseaumi , collected in Orange Harbor (Magellanic Strait) by the “Mission Scientifique du Cap Horn” (Fig 6 L–M), and Mactra pencana (Fig. 6 I–K) and Mactra lotensis (Fig. 6 N–O), both described by Philippi (1893) living on the Chilean coast, are clearly synonyms. : 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 53-54, 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.", "Carcelles, A. & Williamson, S. (1951) Catalogo de los moluscos marinos de la provincia Magallanica. Revista del Instituto Nacional de Investigacion de las Ciencias Naturales, 2 Ciencias Zoologicas, 225 - 383.", "Reeve, L. (1854) Monograph of the genus Mactra. In Reeve, L. (1843.1873) Conchologia Iconica; or, Illustrations of the shells of Molluscous Animals. London, 8, 21 pls.", "Weinkauff, H. C. (1884) Die Gattung Mactra. In: Kuster, H. C. & Weinkauff, H. C. (1841, 1842, 1880, 1881, 1882, 1884) Systematisches Conchylien Cabinet von Martini und Chemnitz. Bauer and Raspe, Nuremberg, 11 (2), pp. 93 - 124.", "Conrad, T. A. (1868) Catalogue of the family Mactridae. American Journal of Conchology, 3, appendix, 31 - 47.", "Mabille, J. & Rochebrune, A. (1889) Mission Scientifique du Cap Horn. Paris, Gauthier-Villars et fils. 6 Zoologie 2, 143 pp.", "Philippi, R. A. (1893) Las especies chilenas del genero Mactra. Anales del Museo Nacional de Chile, Zoologia, 1 - 15."]}