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Journal Article

Anatomy of the Hadal Limpet Macleaniella moskalevi (Gastropoda, Cocculinoidea)

Ellen E. Strong and M. G. Harasewych
Invertebrate Biology
Vol. 118, No. 2 (Spring, 1999), pp. 137-148
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3227055
Stable URL: http://www.jstor.org/stable/3227055
Page Count: 12

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Topics: Ganglia, Salivary glands, Anatomy, Esophagus, Nerves, Animal glands, Sinuses, Thoracic aorta, Septum, Epithelium
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Anatomy of the Hadal Limpet Macleaniella moskalevi (Gastropoda, Cocculinoidea)
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Abstract

The anatomy of the hadal, cocculinid limpet Macleaniella moskalevi is described. This species has a small, symmetrical, cap-shaped shell with a prominent internal transverse septum. As in other cocculinid genera, broad oral lappets and epipodial tentacles are present. Vestigial eyes are also present, but lack pigment and are modified into the basitentacular gland. The unique aortic vessel and associated hemal gland are present. Mantle cavity morphology is characteristic of cocculinid taxa; the cavity contains a pseudoplicatid gill, hypobranchial gland, and shallow brood pouch. Adults are simultaneous hermaphrodites, possessing a gonad with distinct egg and sperm producing regions; the common gonoduct is glandular. The single receptaculum seminis is connected to the anterior gonoduct via an enclosed duct. An enlarged right cephalic tentacle is inferred to function as a copulatory organ. The digestive gland occupies that part of the visceral mass confined above the septum and opens by way of two ducts into the distal esophagus. The anterior digestive tract is characterized by the presence of extremely well-developed esophageal pouches, a cuticularized sublingual pouch, and an unpaired jaw. A subradular sense organ and salivary glands are lacking. M. moskalevi is remarkably unique among previously described cocculinids in the anatomy of the reproductive tract and of the organs associated with the mantle cavity. In particular, the conformation of the nervous system in this species is unknown among cocculinids described thus far.

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