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Species / Eocalyptraphorus

Stromboidea


Type Species: "The type species is Calyptraphorus binodiferus PERRILLAT & VEGA, 1997 from the Maastrichtian of Mexico (PERRILLAT & VEGA, 1997: figs. 18)."

Original Diagnosis by Bandel, 2007, p. 131:

  • "Diagnostic characters: The shell resembles that of Rimella in shape and ornament and the callus deposits on the adult shell are similar to those of Calyptraphorus. In difference to the latter the callus deposits do not cover the spire and the body whorl in total. They cover only the sides of the spire and the widened inner lip of the Body whorl."

Derivation nominis: An early (eo) group of the Calyptraphorinae with shell resembling that of Calyptraphorus.

Comment Bandel, 2007, p. 131:

  • "Calyptraphorus binodiferus PERRILLIAT & VEGA, 1997 from the Maastrichtian of Mexico has a 2 mm high protoconch with rounded apex and embryonic whorl 0.13 mm wide. The teleoconch consists of six whorls which are ornamented by rounded axial ribs and some fine spiral lines and the shell is about 30 mm high. A large callus extends from the aperture and covers much of the shell with exception of the apex. It is bordered by a slit that is covered by the lobe on the side formed by the continuation of the outer lip (KIEL & PERRILLIAT, 2001: fig. 1.45, 2.13). This slit-like canal forms a curved channel through the callus up to the fourth whorl of the spire then cures downward (PERRILLIAT & VEGA, 1997). In difference to Calyptraphorus velatus the callus with the groove does not cover the whole spire but only the sides and the surface of the apertural side of the shell. The slit and its callus rims extends from the posterior part of the outer lip to the other side of the shell crossing the apex, and ends before reaching again the callus cover of the body whorl. The Indian Eocalyptraphorus palliatus (FORBES, 1846) resembles Eocalyptraphorus binodiferus, both are of Maastrichtian age (STOLICZKA, 1868: pl. 2, fig. 20). The Indian species has more rounded whorls but also a callus that does not cover the total shell. The groove in the callus ridge is open to the dorsal side of the shell, as in the Mexican species. Eocalyptraphorus palliatus from the Maastrichtian of Tamil Nadu, India and Eocalyptraphorus binodiferus have characters as found in Rimella, but the callus with the slitlike groove in it is quite similar to that of Calyptraphorus velatus."

Species

might belong to Eocalyptraphorus


History and Synonymy

2009

Comment Kollmann, 2009, p. 59:

  • "In Cretaceous taxa hitherto allocated to Calyptraphorus Conrad, 1857, the callus conceals the ventral side of the shells completely and the dorsal side marginally. The new genus Eocalyptraphorus Bandel, 2007, is applicable exclusively to the type species, E. binodiferus Perrilliat & Vega, 1997, from lower Maastrichtian deposits of Mexico (see Kiel & Perrilliat 2001). In contrast to other taxa it posseses a rather low last whorl with heavy, irregular nodes. The spiral whorls have a sculpture of delicate collabral ribs and spiral threads. This type of sculpture is also developed in C. hopkinsi Olsson, 1934, from the late Cretaceous Monte Grande formation of Peru, in which the last whorl is only moderately inflated. In C. palliata (Forbes) from the Campanian-Maastrichtian of India and Madagascar (Kronenberg & Burger, loc.cit., Stoliczka 1868), the whorls are moderately concave. They show densely spaced growth lines but no other sculpture. C. africana Cox, 1952, from Campanian deposits of Ghana needs closer examination because of its oblique columella."

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