Shell structure of the Galapagos Rift limpet Neomphalus fretterae McLean 1981, with notes on muscle scars and insertions

Title Variants

Alternative: Galapagos Rift limpet

Related Titles

Series: American Museum novitates, no. 2776

By

Batten, Roger Lyman

Type

Book

Material

Published material

Publication info

New York, N.Y, American Museum of Natural History, c1984

Notes

Title from caption.

"January 30, 1984."

"The principal shell layers of Neomphalus fretterae McLean, 1981, are an inner concentric crossed-lamellar and an outer complex crossed-lamellar layer. The protoconch is unusual in being composed of four layers rather than one or two as in most other gastropods. The narrow, high-angled crossed-lamellae of the inner principal layer are nearly identical with those of advanced mesogastropods, rather than the broader, low-angled archeogastropod crossed-lamellae. This, along with shell shape, ornament, and the presence of a muscle platform suggests a closer relationship with the mesogastropod limpets than with the archeogastropods. Muscle attachment is by direct muscle fiber insertion, forming tubules in the shell, and also by myo-adhesive epithelial cells which may form a myostracal layer. Based on the multiple layers found in the protoconch, I speculate on the possibility that the larval stage may have remained planktonic for an extended period"--P. [1].

Subjects

Anatomy , Galapagos Islands , Limpets , Living fossils , Mollusks , Neomphalus fretterae , Pacific Ocean

Call Number

QL1 .A436 no.2776, 1984

Language

English

Identifiers

OCLC: 10630930