CLASSE CEPHALOPODA PDF

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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Nephropore a pair of slits as lateral ends of kidney; apparently lacking sphincter, protected by pair of low flaps, one anterior and another posterior. There is a clear tendency clasae the position of the ganglia of the central nervous system to be distant from the esophagus in most Diasoma, although some basal cepjalopoda still maintain a nerve ring surrounding it Figs. This character, exclusive of the lamellibranchs, is related to the increase of gills.

Pallial longitudinal muscle running along ventral pallial fusion Fig. The feature is very difficult to polarize, as all kinds of cephalopofa are found both in ingroups and outgroups.

Spirula spirula – Wikipédia, a enciclopédia livre

Mantle lobes symmetrical, thin, translucent, colorless. This branch groups nuculids and lamellibranchs, supported by seven synapomorphies.

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This portion, exclusive of the bivalves, is a pair, i. Kidney solid, antero-posteriorly short, but with about same shell width.

Classes do Filo Mullusca

Pair of pedal ganglia of equivalent size to cerebral ganglia, located in opposite side of cerebral ganglia, ventrally to mouth; form of each claxse roughly spherical. Different degrees of mantle fusion are, on the other hand, observed in lamellibranchs e.

Zoologica Scripta32 4: Locomotion in Solemya and its relatives. Functional morphology of the class Helcionelloida nov.

Tableau méthodique de la classe des Céphalopodes

De Wikipedia, le encyclopedia libere. All drawings were obtained with the aid of a camera lucida. Discussion Solemya notialis has a shell very similar to S.

Inner fold differentiated in about 12 small pairs of papillae in ventro-posterior region Fig. Two main approaches were responsible for this change of concepts: For Bivalvia, the following general papers are considered: A gland that secretes byssus is not present in protobranch bivalves.

Of course most of this controversial relationship of the Scaphopoda, whether it be related to the Bivalvia or Cyrtosoma classes, was stressed in early literature e. In most protobranch bivalves, gills serve merely a respiratory purpose, as in other mollusks.

Dorsal surface touching stomach centro-anterior region; ventral surface bulging inside pallial cavity; anterior and a portion cepphalopoda dorsal surface touching kidney. Except for connection with esophagus, no other structure connecting odontophore with neighboring structures. Cephwlopoda possess that gland only in early development Yonge,as is the case of Serratina. Several other characters were selected but excluded from this analysis, because their states were overlapping or purely autapomorphic.

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gracieteoliveira [licensed for non-commercial use only] / Classes do Filo Mullusca

cephzlopoda Transactions of the Royal Society of South Australia62 2: Muscle development in Antalis entalis Mollusca, Scaphopoda and its significance for scaphopod relationships. The inflation is wider in the foot’s tip.

Proceedings of the National Academy of Sciences of the U. The expression of an engrailed protein during embryonic shell formation of the tusk-shell, Antalis entalis Mollusca, Scaphopoda.

Pair of cerebral ganglia more elongated laterally, possessing a single anterior nerve each Fig. This character was inserted in order to organize the pair of cyrtosome outgroups. Scaphopod captacula have been proposed to be homologous to cephalopod arms.