Notes on Opisthobranchia

Marcus, Ernesto

doi:10.1590/s0373-55241956000100002

Cited by 30 publications

(28 citation statements)

References 8 publications

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“…Tornatina canaliculata (personal observations) is very similar to T. candei (Orbigny) (see Marcus, 1958). Wells & Wells (1962) consider T. canaliculata to belong to the genus Retusa but the presence of the radula and the shape of the gizzard plates preclude any serious consideration of such a move.…”

Section: The Evolution Of the Philinaceaementioning

confidence: 97%

A new species and genus of the Aglajidae and the evolution of the philinacean opisthobranch molluscs

Rudman

1978

Zoological Journal of the Linnean Society

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A new genus and species of the Aglajidae is described. It differs from the other members of the family in having a radula and a rudimentary gizzard, but has sensory bristles and the Yellow Gland, features unique to the Aglajidae. From all the evidence available it is suggested that the families Scaphandridae, Gastro‐pteridae, Philinidae and Aglajidae arose separately from a Cylichna‐wke ancestor with an oodiaulic reproductive system. It is possible that the first three families arose from a common ancestor that had developed a monaulic reproductive system, but it is equally likely that monaulism occurred independently in each family, as it has in the Aglajidae. A new family for Cylichna is proposed. Summary. Cylichna fills many of the requirements of an hypothetical common ancestor of the Philinaceae. From such an ancestor, five distinct lines have evolved, each separately specializing different aspects of their anatomy (Fig. 6). In the Tomatina‐Cylichnella group, the development of a monaulic reproductive system and calcification and elaboration of the gizzard plates, seems to be the only major advances. In the Scaphander‐Paracteocina group we see a tendency to detort with accompanying degeneration of the shell. Monaulism and the calcification and elaboration of the gizzard plates has also occurred. In Philine, bilateral symmetry of the body has evolved, the shell is internal and the reproductive system is monaulic. The alimentary canal in advanced forms shows great elaboration. We find species showing all stages in the evolution of the P. aperta‐type gut from the primitive P. falklandica‐type. In the Gastropteridae, jaw‐plates have been retained, but the gizzard has been lost. The greatest development has been in external body form, with loss of the mantle cavity and presence of an external gill and large wing‐like parapodia for swimming. In the Aglajidae we find the greatest degree of modification. In all but Odontoglaja the radula and gizzard have been lost, and in all cases the body is very stream‐lined, the shell being reduced and internal. Aglajids are capable of infaunal burrowing, but most species are usually epifaunal. Unlike the other families there is a diversity in the structure of the reproductive system.

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Section: The Evolution Of the Philinaceaementioning

confidence: 97%

A new species and genus of the Aglajidae and the evolution of the philinacean opisthobranch molluscs

Rudman

1978

Zoological Journal of the Linnean Society

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“…It would appear that Acteon punctostriatus (C.B. Adams, 1840) has a similar radula (Marcus, 1958). This has unfortunately been used as part of an argument to relate the Acteonidae to the pyramidellids; "... and it is well known that in the Acteonidae the radula carries only extremely small and weak teeth..." (Fretter & Graham, 1949, p. 527).…”

mentioning

confidence: 99%

A study of the anatomy ofPupaandMaxacteon(Acteonidae, Opisthobranchia), with an account of the breeding cycle ofPupa kirki

Rudman

1972

Journal of Natural History

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“…A review of the literature shows that six acteonid species, distributed among Acteon Montfort, 1810, Crenilabium Cossmann, 1889 and Mysouffa Marcus, 1974, have been reported from Brazil (MARCUS 1958, 1970, 1972a, b, SIMONE 2006b, RIOS 2009. Acteon mirim sp.…”

Section: 4mentioning

confidence: 99%

A new species of Acteon (Opisthobranchia: Acteonidae) from Northeast Brazil

Cunha

2011

Zoologia (Curitiba, Impr.)

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Notes on Opisthobranchia

Cited by 30 publications

References 8 publications

A new species and genus of the Aglajidae and the evolution of the philinacean opisthobranch molluscs

A new species and genus of the Aglajidae and the evolution of the philinacean opisthobranch molluscs

A study of the anatomy ofPupaandMaxacteon(Acteonidae, Opisthobranchia), with an account of the breeding cycle ofPupa kirki

A new species of Acteon (Opisthobranchia: Acteonidae) from Northeast Brazil

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