Jurassic Trigoniid bivalves from Canada and western United States of America

Larval ecology of Cretaceous inoceramid bivalves from northwestern Hokkaido, Japan

“…Changes on area ornamentation do not differ significantly from those identified by Maeda and Kawabe (1966) for Myophorella orientalis from the Upper Jurassic to Lower Cretaceous of Japan. In fact it may probably be common to most Myophorella species, as pointed out in the characterization for the genus by Crickmay (1932) and as can be seen in many published materials (e.g., Poulton 1979;Cooper 1991: fig. 5;Leanza 1993: pls.…”

“…Subsequently he related it to Myophorella hillebrandti Reyes and Pérez, 1985 from the Neocomian of Chile and to M. eufalensis (Gabb, 1860) from the Upper Cretaceous of Mexico and the USA (Leanza 1993). There are also species from other basins that show some common features with M. garatei, like M. orientalis Kobayashi and Tamura, 1955, from the North Pacific, or M. argo (Crickmay, 1930b) from Western North America (Maeda and Kawabe 1966;Poulton 1979), but both of them differ from the former in their relatively wider area. Myophorella yellowstonensis Imlay, 1964, found in Middle Jurassic rocks from Western North America, is very similar to M. garatei according to the description and figures provided by Poulton (1979: 36, pl.…”

“…They were a very diverse group of bivalves during the Mesozoic (Cox 1952), but nowadays they are represented by a few species restricted to Australian sea waters (Fleming 1964). Much work has been done on the systematics of the group either on a regional scale (Hoepen 1929;Kobayashi 1954;Poulton 1979;Kelly 1984;Fleming 1987;Leanza 1993;Pérez et al 2008) or on a global one (Crickmay 1932;Cox 1952), including some papers trying to establish the phylogenetic relationships among genera (Saveliev 1958;Newell and Boyd 1975;Cooper 1991;Boyd and Newell 1997). All genera have been usually interpreted as shallow burrowers (Newell and Boyd 1975), with shell morphology and ornamentation strongly correlated to their life habits and habitat (Stanley 1977; see also Francis and Hallam 2003 for a more recent review on the topic).…”

A Late Permian to Early Triassic Bivalve Fauna From the Dongpan Section, Southern Guangxi, South China

“…Circumpacific domain: Late Triassic: Carnian of Japan (Hayami, 1975); Norian of ?Oregon (United States) (Newton in Newton & others, 1987); Early Jurassic: Hettangian-Sinemurian of Texas (United States) (Liu, 1995); Sinemurian of northern Canada and Nevada (United States) (Poulton, 1979), Sonora (Mexico) (Scholz, Aberhan, & González-León, 2008), Peru (Pérez & Reyes, 1991), Chile (Pérez & others, 2008).…”

A conch with a collar: early ontogeny of the enigmatic fossil bivalveMyoconcha

“…They were a very diverse group of bivalves during the Mesozoic (Cox 1952), but nowadays they are represented by a few species restricted to Australian sea waters (Fleming 1964). Much work has been done on the systematics of the group either on a regional scale (Hoepen 1929;Kobayashi 1954;Poulton 1979;Kelly 1984;Fleming 1987;Leanza 1993;Pérez et al 2008) or on a global one (Crickmay 1932;Cox 1952), including some papers trying to establish the phylogenetic relationships among genera (Saveliev 1958;Newell and Boyd 1975;Cooper 1991;Boyd and Newell 1997). All genera have been usually interpreted as shallow burrowers (Newell and Boyd 1975), with shell morphology and ornamentation strongly correlated to their life habits and habitat (Stanley 1977; see also Francis and Hallam 2003 for a more recent review on the topic).…”