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Species / Calyptraphorinae


Bandel, 2007, p. 130:

  • Diagnostic characters: The juvenile shell resembles that of Rimella or Ectinochilus in shape and ornament. When fully grown a callus is added to the slender conical shell and its shape changes due to a broadening of the sides. The callus of the inner lip joins the callus of the margin of the outer lip and extends onto the spire forming a groove and pad. Callus may also cover the surface of the apertural side of the shell. Callus covers part of the shell in Eocalyptraphorus n. gen., and it completely transforms shell shape by additions of callus in Calyptraphorus. The shell of Aulacodiscus is extremely coated over with callus. Cyclomops [sic] has the shell similar to Ectinochilus with callus sheets attached to the margins of the apical callus groove and thus broadening the body whorl.
  • Derivatio nominis: The subfamily is named according to the characteristic genus Calyptraphorus belonging here.
  • The species of the Calyptraphorinae document a change from the juvenile stage to the adult stage that represents a similar drastic reconstruction of the shell during ontogeny as noted in Aporrhaidae and Strombidae among the living Stromboidea. While the adult stage is characterized by a much widened apertural region that aids in having a stable position when moving openly on soft substrate (SAVAZZI, 1991), the juvenile shell is slender and thin that helps in rapid growth and moving through entangled vegetation and within the sediment, as is the case with juvenile Strombus (BANDEL & WEDLER, 1987). Calyptraphorinae have made that change by shell additions to the sides and by adding smooth callus to the upper and lower side of the shell. Shell was secreted by mantle tissue that was extended over the shell, and spread out to add shell material over its surface. The genus Calyptraphorus is characteristic to the Calyptraphorinae n. subfam. with type species Calyptraphorus velatus from the Eocene of Mississippi. Eocalyptraphorus n. gen. lived in the Tethys Ocean during the Late Cretaceous of Mexico (PERRILAT & VEGA, 1997) and India (STOLICZKA, 1868). No species are known from later than the Eocene (COSSMANN, 1904), and the subfamily existed for more than 35 Million years.
  • Calyptraphorus Conrad, 1857
  • Cyclomolops Gabb, 1868
  • Eocalyptraphorus Bandel, 2007
  • Jaumaporta Etayo-Serna, 1979
  • Veatchia Maury, 1912
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