New Cancellariidae (Mollusca, Gastropoda) From the Miocene Gatun Formation of Panama, With Eleven New Species

Abstract

Thirty species of Cancellariidae in 11 genera from the Miocene Gatun Formation in the Panama Canal area, Caribbean Panama, are discussed including two species not represented by specimens suitable for formal description. The following 11 species are described as new:Cancellaria harzhauserin. sp.,Cancellaria mixtan. sp.,Bivetiella dilatatan. sp., Euclia alacertatan. sp.,Pyruclia tweedledumn. sp.,Pyruclia tweedledeen. sp.,Massyla toulain. sp.,Aphera aphroditen. sp.,Axelella cativan. sp.,Agatrix agathen. sp.,Ventrilia coatesin. sp. This assemblage of cancellariids is very diverse and highly endemic, with 18 (60 percent) species found only in the Miocene Gatun Formation. These assemblages all lie within the Gatunian Neogene Paciphile Molluscan Unit 1 (GNPMU1).

The Family Cancellariidae (Mollusca: Gastropoda) in the Neogene of the Bocas Del Toro Region, Panama, with the description of seven new species

“…Narona barystoma Woodring, 1970 was described from the lower Pliocene Gatun Formation of Panama. It was subsequently reported from the lower Miocene Cantaure Formation of Venezuela (Landau and Petit, 1997), and has also been found in the upper Miocene Cercado Formation of the Dominican Republic (Landau, unpublished data). Narona barystoma is much larger shelled than N. decaptyx, with more rounded, less angular whorls, more numerous axial ribs, broader folds on the columella and heavier denticulation within the aperture.…”

“…The tropical American Massyla species can be separated into two main groups. One consisting of those with solid, squat shells, strongly depressed spires and strap-like spiral cords, such as the living American Pacific M. obtusa (Deshayes, 1830) and M. cumingiana (Petit de la Saussaye, 1844), including the fossil M. lopezana Jung and Petit, 1990 from the lower Miocene Baitoa Formation of the Dominican Republic, M. cantaurana Landau and Petit, 1997 from the lower Miocene Cantaure Formation of Venezuela, and M. cubaguaensis Landau, Petit and Silva, 2007 from the lower Pliocene Araya Formation of Cubagua Island, Venezuela. Species in the other group have rather less solid, more fusiform shells, with more elevated spires such as M. venusta (Tuomey and Holmes, 1856) and M. propevenusta (Mansfield, 1929) both from the Plio-Pleistocene of the Carolinas and Florida, and M. distinguenda.…”

Revisión de la Subfamilia Crassatellinae (Bivalvia: Crassatellidae) del Paleógeno—Neógeno de Argentina

“…The Quaternary Californian species, H. fluctuatus, has a widely divergent posterior ridge, a foreshortened posterior, and dorsally truncated left anterior cardinal tooth (Fig. 2E), one or more characters of which are shared with Pacific specimens of the late Eocene or early Oligocene northern Peruvian H. disenum, the early Miocene (Marks 1951) or early middle Miocene (Deniaud et al 1999) Ecuadorian species, H. carrizalensis (Marks, 1951), the late Miocene (Landau et al 2012) Ecuadorian species H. picaderus (Olsson, 1964) (Fig. 5A, B), and Caribbean specimens of the late Miocene (Bold 1966) Colombian species, H. tuberus (Olsson, 1964) (Fig.…”

First record of buccinid genusChauvetia(Mollusca: Gastropoda) from the fossil record of the New World (Miocene, Venezuela) and its paleobiogeographic implications

“…The rich Lower to Middle Miocene marine fossiliferous deposits of the Cantaure Formation, Paraguaná Peninsula, northern Venezuela (e.g., Jung, 1965; Gibson-Smith and Gibson-Smith, 1974; Landau and Petit, 1996; Landau et al, 2007) continue to astound us and to yield interesting results as well as surprising findings. In this paper, we report and discuss the unexpected presence of the buccinid genus Chauvetia Monterosato, 1884 in the Cantaure assemblage, with the description of a new species.…”