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Species / Struthiolarella Mcmurdoensis

Struthiolarella Mcmurdoensis

Stromboidea


Original description of Struthiolarella mcmurdoensis by Stilwell, 2000

  • "Shell medium-sized for genus (about 30 mm in height for adults), moderately thick, with moderately elevated spire of 5 subquadrate, somewhat angled to very slightly convex whorls; spire angle variable from about 60-70; protoconch broadly and obtusely conical, paucispiral, mammillate, of 2-2 smooth whorls; suture slightly impressed; whorl inflation rapid; last whorl moderately to greatly inflated, biangulate, ornamented with 12-14 collabrally inclined, rounded, moderately protruding and strong tubercles, extremely weak spiral threads (about 2 threads per mm), and very strong Anarctodarwinella-like sinuous growth lines that increase in strength at onset of cessation of growth in gerontic individuals; adapical portion of sutural ramp short, slightly concave; adapertural angulation blunt and somewhat inflated; basal constriction short, rapid; spire whorls with about 12 tubercles situated at center of whorl marking a strong angulation; some tubercles dissected by sinuous growth lines that have a moderately deep posterior sinus angle (PSA) of about 30-35; fasciole moderately developed, characterized by strong peribasal ridge; aperture moderately large, peristome sublenticular in outline; siphonal canal shallow, short; columella moderately short, distinctly concave; callus pad on labium relatively narrow, but thickened; outer lip slightly projecting as blunt wing."

Locus typicus: McMurdo Sound, Ross sea, Southern Ocean, Antarctica

Stratum typicum: Eocene

Geographic distribution: McMurdo Sound, Ross sea, Southern Ocean, Antarctica

Etymology: Species named for its sole known presence in McMurdo Sound

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