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Species / Calyptraphorus

Calyptraphorus

Stromboidea


Original Genus Description by Conrad, 1857, p. 166:

  • "Shell subfusiform; spire acutely rostrated; beak straight, very slender; labrum with a sinus at summit and base, elsewhere entire; a calcareous deposit covers the entire shell within and without."

Type species is Rostellaria velata Conrad, 1833.

Calyptraphorus species are:


History and Synonymy

  • Calyptrophorus Conrad, 1866, Smith. Misc. Coll. 200, p. 13 [nomen nudum].
  • Not Calyptrophorus Cabanis, 1847, Archiv. fur Naturgeschichte, vol. 13, pt. 1, p. 329 [a bird].

1868

Description of the genus Calyptraphorus by Gabb, 1868, p. 142:

  • "Shell elongate, fusiform, spire high, anterior canal long and straight; posterior canal long, closely appressed to the spire and arching on the back, as in some species of Hippochrenes; outer lip moderate, rounded, and thickened on the margin by a smooth border; young shell showing all the volutions, which are hidden in the adult by a polished incrustation covering the entire surface, and in some species bearing tubercles or bosses, their shape, size and number varying in different species."

1933

Comment Gardner, 1933, p. 266:

  • "Though Gabb's name differs by one letter from that proposed twenty years earlier for a bird by Cabanis, the two names are obviously of the same derivation. The Commission on Zoological Nomenclature has considered synonymous, words which differ only in the vowel connecting two roots and has as a rule recognized only the name having priority of publication. Cabanis specified his type and Calyptrophorus is in good standing among the ornithologists, but long and general usage will perchance justify the retention of Gabb's name Calyptraphorus among the malacologists."

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."

2013

Talk on Geocon 2013 by Tomoki Kase and Yolanda M. Aguilar:

  • The Gastropod Genus Calyptraphorus (Strombidae: Molussca [sic]): A Lazarus Taxon from the Piocene[sic] of the Philippines

2014

Kase & Aguilar, 2014:

  • "Calyptraphorus is a distinctive stromboidean gastropod genus with its earliest fossil record from the Campanian (Cretaceous). The genus survived the K-Pg biotic crisis and was thought to have become extinct before the end of the Eocene. Calyptraphorus sp. is described on the basis of a single specimen recovered from the mid-Pliocene Tartaro Formation in northern Luzon, the Philippines. The specimen is similar to Eocene congeners recorded from the southeastern United States and Pakistan. It is left unnamed because the single available specimen is too incomplete for comparison with other known species. The significance of this discovery is that it extends the recorded stratigraphic range of the genus from the end of the Eocene to the Pliocene, leaving a hiatus of approximately 30 Myr, which classifies Calyptraphorus sp. as a Lazarus taxon. The genus apparently survived as a refugee taxon in the tropical Western Pacific, keeping the population density very low and/or the geographic distribution limited to small areas after the Eocene biotic crisis.

References:

  • Conrad, 1857 (1858)
  • Kase, T., Aguilar, Y.M. 2014. The gastropod genus calyptraphorus (Rostellariidae: Stromboidea: Mollusca): A lazarus taxon from the pliocene of the philippines; Paleontological Research, 18 (3) pp. 169-175.
  • Perrilliat & Vega, 1997

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