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Larcopyle eccentricum Lazarus et al, 2005

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Larcopyle eccentricum
Derivation of name. The name refers to the slightly asymmetric ellipsoidal shape of the shell.
Holotype. Plate 6, figs 1–3, 689B-6H-1, 59–61 cm (Middle Miocene, Weddell Sea). Museum für Naturkunde, Mikropaläontologie No. ECO-19.
Description. The shell is elongate egg-shaped and about 120 µm long. The interior of the shell is usually empty, although a delicate set of widely spaced elongated medullary shells can be seen in some specimens. A well-developed pylome with teeth is visible at one pole, which often forms a tube-like structure. The medium-sized pores are circular and rather regularly arranged. They are surrounded by weak frames. The surface varies from smooth to somewhat thorny due to variably developed pore frames. The outer shell wall is rather thin.
Occurrence. Early Miocene–Mid Miocene, scattered, rare questionable occurrences to the Early Pliocene.
Remarks. Differs from Cenolarcopyle fragilis Tan, 1927 (described from tropical sediments of uncertain Tertiary age), despite a superficial similarity in overall shell shape, in that, according to Tan Sin Hok’s description, C. fragilis has a pylonid (larnacilla) inner shell, irregularly distributed pores on the cortical shell and is significantly smaller (length 105 µm).
Lazarus et al 2005


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