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Species / Austroaporrhais Larseni

Austroaporrhais Larseni


Original Description of Austroaporrhais larseni by Zinsmeister and Griffin, 1995

  • "Shell moderately large-sized, high turreted spire of at least nine whorls; spire angle 30-32 degrees; early whorls with subdued keel, but with keel increasing in strenght and shifting from a central to a more anterior location on later whorls; shell surface ornamented with delicate spiral threads, with tend to increase in strength and become more widely spaced on body whorl; axial ornamentation consists of approximately 10 wavy ribs per whorl; ribs variable, ranging from very strong to blunt axially elongated nodes; sinuous varices irregularly developed; aperture moderately wide, elongated, sublenticular; anteriorly with a narrow canal continuing into a long, curved canal frequently bifurcated; outer lip of aperture expanded into a sub-trapezoidal wing carrying two very prominent digitations, both reflected from wing and curved outward; interior surface of wing with two narrow grooves running into digitations; margins of wing not appreciably thickened at any point; fairly thin callous pad on inner lip of aperture."

Locus typicus: Seymour Island, James Ross Island group, Antarctic Peninsula, Antarctica

Stratum typicum: Maastrichtian part of the López de Bertodano Formation, upper Cretaceous


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