Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: A comparative morphology of male reproductive structures in some California isopods
Student Author(s): Storey, Porter
Faculty Advisor(s): Abbott, Isabella
Pages: 13
Location: Final Papers Biology 175H
Date: June 1973
Keywords: Isopoda
Abstract: Dissections and drawings were made of the testes and endopodites of eight species of California isopods. The Oniscoidea represented by Alloniscus perconvexus, Armadillidium vulgare, Ligia occidentalis, and Porcellio scaber have three uniformly spaced, elongate testes attached to a seminal vesicle at various positions in the body cavity. All but L. occidentalis have a broad projection from the first endopodite and a sickle-like style from the second endopodite. The Valvifera are represented by Idothea (Pentidotea) resicata and I. stenops. Both of these species have similar elongate testes spread down a thin vas deferens. There are no special modifications of the first endopodites in either species and the second endopodites have a long uniformly wide style. The Flabellifera also show similarities within the suborder. Cirolana harfordi and small Lironeca vulgaris both have bulbous, sac-like testes extending from the apex of a narrow vas deferens which may take many different paths in C. harfordi. The larger L. vulgaris has only an amorphous mass of tissue for testes as it begins its transformation to a female. All three forms have similar tapering styles on the second endoporite.