A Generic Revision Of The Family Loliginidae (cephalopoda; Myopsida) Based Primarily On The Comparative Morphology Of The Hectocotylus (zoogeography)

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Doctor of Philosophy (Ph.D.)


Biology and Living Resources


The hectocotylus, the sexually modified arm of male cephalopods, is described from 39 species representing both families of the suborder Myopsida. The hectocotylus is shown to be an important character in the study of myopsid squid. Six morphological hectocotylus "Types" are described and the hectocotyli of representative species of each Type are illustrated. The loliginid genera are revised primarily on the basis of the morphology of the hectocotylus although other characters of generic significance are considered, supplemented by zoogeographic distributions and paleogeographic data. The genus Doryteuthis is redefined to include all of the American species currently in Loligo, thereby eliminating the genus Loligo from American waters. Loliolus and Uroteuthis are reduced to subgeneric status under Loligo while Nipponololigo and Photololigo are considered to be junior synonyms of Loligo. Loliolopsis is shown to be a junior synonym of Lolliguncula. The African members of the genus Lolliguncula are placed in a new genus, Afrololigo. Heterololigo is shown to be a junior synonym of Doryteuthis. Phylogenetic relationships within the Loliginidae, as indicated by the hectocotylus morphology in conjunction with other characters are given.


Biology, Oceanography

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