Nuevos hallazgos de fósiles de Macrocheira (Brachyura, Inachidae) en el Pacífico nororiental
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Resumen
Nuevos ejemplares fósiles de Macrocheira, colectados en rocas del Eoceno al Mioceno de Canadá y el oeste de Estados Unidos, incrementan el registro de los Inachidae. Macrocheira está representada únicamente por una especie actual, M. kaempferi, endémica de Japón y Taiwán. Dos especies fósiles han sido previamente descritas del Estado de Washington y Macrocheira longirostra Schweitzer y Feldmann, 1999, de la Arenisca Quimper del Eoceno, y M. teglandi (Rathbun, 1926) de la Formación Makah del Oligoceno. En este trabajo, se reportan tres nuevas especies: M. jayi n. sp., del Eoceno tardío al Oligoceno de la Formación Hesquiat, de la Isla Vancouver, Columbia Británica, Canadá; M. sullivani n. sp., del Eoceno tardío al Oligoceno temprano, de la Formación Keasey, Estado de Oregon, E.U.A.; y M. columbiaensis n. sp., del Mioceno temprano a medio de la Formación Astoria del Estado de Washington, E.U.A. Varios ejemplares de Macrocheira se han reportado también en el Mioceno de Japón, pero su afinidad sistemática es incierta, por lo que de forma preliminar, se identifica como Macrocheira sp. aff. M. kaempferi. Con la descripción de tres especies nuevas de Macrocheira, se incrementa a cinco el número de especies fósiles y el género queda ahora bien establecido para el Eoceno al Mioceno del Pacífico Noreste de Norteamérica
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