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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Pair of foot protractor muscle Fig. Comparative morphological study and phylogeny of representatives of the Superfamily Calyptraeoidea including Hipponicoidea Mollusca, Caenogastropoda.

This measure is for testing the monophyly of Diasoma; conversely, the indices are shared with these taxa.

However, those cases are convergences or, in the light of the present study, possibly reversions. Suspensory membrane becoming shorter and wider towards anterior, supporting entire gills Figs.

Anterior edge very thick Figs.

Loligo forbesii Steenstrup, – Taxonomy

Bivalve seashells of western North America. Central nervous cephalopoxa Figs. This leads to an interpretation that infaunal habits appear as insufficient explanations to justify the common organization between bivalves and scaphopods. Your request to send this item has been completed.

A monograph of the east American scaphopod mollusks. Foot capable of enfolding along itself at about half its length Figs. Discussion of Each Branch of the Cladogram Fig. Zoologica Scripta27 1: Although they are not the main goal of this paper, the taxa Scaphopoda and Bivalvia are supported by 8 and by 7 synapomorphies respectively.

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The csphalopoda of two scaphopod species from Japan. Foot tip with central foramen corresponding to its enfolding portion. The age of appearance of the filibranch branch is late Cambrian or early Ordovician Cope, showing a very ancient path of evolution.

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Patterns of morphological diversification among the Rostroconchia.

Please re-enter recipient e-mail address cehpalopoda. Some combined molecular approaches have even demonstrated that scaphopods are related to a set grouping cephalopods and nonconchiferan aplacophorans, at the base of Mollusca Giribet et al.

A parallel concept is applied in relation to birds, which are considered to be modified, existent dinosaurs Currie et al.

Representationes Leger Modificar Modificar fonte Vider historia. A revision of the Scaphopoda from Australian waters Mollusca. Ciliary connections attach the gills to neighboring structures, such as mantle lobes and visceral sac Figs. Gonoduct running towards anterior, between stomach and mantle, gradually running obliquely, from median line to right, crossing esophageal insertion; insertion on dorsal-right surface of kidney, just by side of local portion of esophagus.

Pair of small palp muscles located in postero-dorsal corner between both hemipalps Figs. Taking into consideration Paleontology, the Cambrian genus Heraultia has been indicated as the stem group of Diasoma, raising scaphopods, rostroconchs and bivalves Pojeta et al. Observations on the anatomy of the classw mantle, and the description of a new family, the Fustiariidae.

Comparative morphology cephallpoda phylogeny of representatives of the superfamilies of architaenioglossans and the Annulariidae Mollusca, Caenogastropoda. Solemya mediterranea Lamarck,SD Children, Journal of Zoological Systematics and Evolutionary Research This approach is possibly based on a set of highly derived characters that modern solemyids have, which, when analyzed alone, suggest they could not be placed at the base of protobranchs.

Loligo sp (lula)

Nephropore a pair of slits as cephaloopda ends of kidney; apparently lacking sphincter, protected by pair of low flaps, one anterior and another posterior. This study deals with detailed morphology and anatomy of 4 species of Scaphopoda and 5 species of protobranch Bivalvia. Cadulus tetraschistus Watson an earlier name for C.

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There is an expansion surrounding the tip that assists the animal in anchoring into sediment Drew, The classse history of these groups shows that rostroconchs are highly diverse in the lower Paleozoic, mainly in the Ordovician, being gradually replaced by bivalves Pojeta, However, another affinity for the Scaphopoda gradually appeared, approximating the taxon to the Gastropoda-Cephalopoda branch e.

The ligament and digestive system in the taxodont bivalves. Yet characters 21 and 22 explore special features of the Diasoma classes, which are absent in the remaining ones. Considering that the scaphopod mouth is at the base of the oral tube see character 36both captacula and palps are lateral expansions of this structure, being located in the same region.

The large sized gills possibly raised some confusion in early literature, as protobranchs supposedly should possess only small, merely respiratory gills. On the gutless Protobranchia Bivalvia. Consequently, in the point of view of the present result, Rostroconchia is not an isolated extinct class, and two rostroconch branches are still living today – Bivalvia and Scaphopoda.

Peroxysomes in the digestive diverticula of the bivalve mollusc Nucula sulcata. Nothing cephaoopoda that was found in the examined species, except for some series of low folds Figs. The oral tube is a flexible and muscular cone projected forwards, normally full of prey, such as foraminifers and more rarely, small mollusks and other organisms.

Palps and digestive diverticula described above.