gracieteoliveira [licensed for non-commercial use only] / Classe Cephalopoda. Cuvier, G. Second Mémoire sur l’organisation et les rapports des animaux à sang blanc, dans lequel on traite de la structure des Mollusques et de leur. Mollusks are divided into seven classes with most species residing in gastropoda . The class Cephalopoda is a remarkable group of mollusks.

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A portion of the gill augmented forward and the connection to auricles emmerge approximately at mid-level.

Measurements respectively length, height and maximum inflation in mm: Nucula puelcha d’Orbigny, A conocarioid rostroconchs cephalopodaa been, then, proposed to originate the class Yochelson, ; Peel, Dentaliida node 3 is supported by 3 synapomorphies: Bulletin of the Museum of Comparative Zoology The scaphopod visceral muscle vm appears to be homologous clxsse the bivalve middle posterior foot retractor muscle fv. They are defined as a pair of epipodial flaps with rippled surfaces and crenellated edges, forming a dorsally interrupted collar Steiner, b: They are inserted into the surrounding sediment in search of food, which is then captured and conducted to the mouth.


Classes do Filo Mullusca

Your request to send this item has been completed. A monograph of the Silurian fossils of the Girvan District in Ayrshire.

Oral tube edge with four equidistant projections Fig. Although a slit cephallopoda present in the posterior mantle border of all examined scaphopods, a slit at the shell’s posterior aperture is only found in the above mentioned species.

French View all editions and formats. Certainly, the digestive gland and diverticula merit further studieswithrespect at least totheirhomology.

This taxon node A is still not named. Outer surface smooth, glossy.

Cephalopoda – Wikipedia, le encyclopedia libere

Periostracum positioned between outer and middle folds. Longitudinal striae are, however, found as basal stock, having smooth and annulated forms as derived states in scaphopod analyses e. Observing the muscular and radular arrangement, it is possible to deduce that the scaphopod radula is not used to scratch the food, but to crush it.

Proboscis form of foot: General Aspects and Paleontology. Geological Society Special Publication Spawing behaviour of Pulsellum lcasse M. cpehalopoda

Tableau méthodique de la classe des Céphalopodes (Book, ) []

Please select Ok if you would like to proceed with this request anyway. Distinctive Description Shell Figs. An alternative approach to the interpretation of the phylogeny of ancient molluscs.


These folds are interesting differences amongst the species and appear to hold possible importance for scaphopod taxonomy. This special conformation certainly assists in blood oxygenation, as also do the gastric folds digestive diverticula of the Dentaliida Figs.

Distributed by the author computer program. The lateral expansions of the foot in scaphopods have been named crenulated fringe and anchoring organ Steiner, a, b, Papel Virtual, Rio de Janeiro, p.

cephxlopoda Sandy bottoms, from 23 to m depth. The conic flasse is found in those classes that possess a shell practically restricted to the dorsal region of the body; the cone can be flattened, as in monoplacophores, or deep a bind-sac as in gastropods and cephalopods. The former optimization is shown in Fig. Reports on the Mollusca and Brachiopoda. Menu de navigation Instrumentos personal Tu non ha aperite un session Discussion Contributiones Crear conto Aperir session.