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Species / Tessarolax Antarctica

Tessarolax Antarctica


Original description of Aporrhais (Tessarolax) antarctica by Cox, 1953:

  • "Shell of medium size (height about 45 mm.) and stoutness, with a moderately long, narrow, straight anterior rostrum. Earlier whorls obtusely angular in the middle, the angle bearing small tubercles. Penultimate whorl with a prominent rounded keel, without tubercles, continuing this angle, and with a second rounded keel just visible above the lower suture. Last whorl with two conspicuous, rounded keels which continue those of the penultimate whorl and are separated by a strongly concave band; a third keel, less prominent, lies below them. Faint spiral threads are present on the whole surface of the shell, including the base. Outer lip with two long and very narrow digitations continuing the main keels, the upper one curving upwards to a slight extent. The upper edge of the last whorl stands out as a thin ridge bordering the suture and bends upwards at the termination of the whorl, suggesting that there was a digitation adhering to the spire. The external mould in which this feature is observable is, however, broken away so that the impression of the digitation itself is mi,ssing."

Locus typicus: Fossil Bluff (lat. 7110'S., long. 6819'W.), Alexander Island, west of Palmer Land, Antarctic Peninsula, Antarctica

Stratum typicum: Aptian, lower Cretaceous

Aporrhais (Tessarolax) antarctica (Cox, 1953); Aptian, lower Cretaceous; Fossil Bluff, Alexander Island, west of Palmer Land, Antarctic Peninsula, Antarctica; Coll. BM(NH) nos. G.69799 to G.69801; Copyright BM(NH)

  • Holotype upper left

Comment Han Stoutjesdijk:

  • This species is no Tessarolax. It might be genus between Dicroloma and Struthiochenopus


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