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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However, based on a different kind of protoconch, this possibility has been rejected Peel, Another five species are outgroups, but they cllasse operationally analyzed as part of the ingroup.
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Content of buccal tube several foranmifer testa and rarely small mollusks. This feature was explored phylogenetically at the ordinal level Steiner, This feature is found in an animal that is actively exploring a new environment. The “proboscis” form is based on structural similarities between the gadilid foot and the gastropod proboscis.
Symbiotic chemoautotrophic bacteria in marine invertebrates from sulphide-rich habitats. Your list has reached the maximum number of items. Part 2 – Gastropoda and Scaphopoda. Additional features can be found in the epithelium of scaphopod anterior mantle edge, which can differentiate both orders Steiner, a, Parallel evolution to closure of the shell aperture only by means of shell flexibility is found in some other groups of molluscs, such as the gastropod sacoglossans Ascobulla Marcus, and Cylindrobulla Fisher, Volvatellidae.
The anatomy of Neopilina galatheae Lemche, Sculpture six longitudinal, equidistant primary ribs close to posterior aperture; gradually secondary ribs appearing between primary ribs towards anterior, about 30 similar-sized ribs close to anterior aperture Figs. Middle posterior foot retractor muscle Figs.
In the Discussion, some terms are used to designate a collective set of taxa, with no taxonomical purpose. Dentaliida node 3 and Gadilida node 4 e. The node represents the family Solemyidae, supported by three synapomorphies such as: 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 casse Scaphopoda.
Although the number of taxa studied here is equivalent to that found in most papers, above related, referent to molecular and ultrastructural aspects, the main objective is not to test the other methodologies, nor their importance for comparative approaches.
In the discussion of the character, a short descriptive sentence is given for each one, followed by plesiomorphic and apomorphic states and conditions in the most parsimonious hypothesis.
Maximum width about half of shell length, located between middle and anterior thirds. Brazilian Journal of Oceanography54 1: Circulatory and excretory systems Figs. Xenoconchias and their bearing on the phylogeny clssse systematics of some molluscan classes. Rarely there is a clear separation between foot and viscera. Esophagus filiform, running between both auxiliary middle pedal retractor muscles up to their middle level; suddenly running posteriorly, gradually expanding and forming stomach; lacking clear limit between esophagus and stomach.
It is equally parsimonious to consider that state 1 is a synapomorphy of node 7 with a reversion in eulamellibranchs node 9or a mere convergence between both above species. Papel Virtual, Rio de Janeiro, p.
Faunal studies of the Wanwanian basal Ordovician Series with special notes on the Ribeiridae and the ellesmereoceroids. From Bivalvia, one or two samples of the main branches of basal taxa, i. The taxon Protobranchia is paraphyletic, an arrangement of at least three branches of basal bivalves.
Characters somewhat similar to those of preceding species, except for more elongated and narrower gonad fashion Fig. Gadilida node 4 is supported by 7 synapomorphies, of which the more important are: Dentalium Fissidentalium floridense Henderson, Brazilian marine mollusks iconography. The invasive rapa whelk Rapana venosa Velencienner Total loss of the gills is cephslopoda long known synapomorphy of Scaphopoda. Most possess that gland only in cephapopoda development Yonge,as is the case of Serratina.
This demonstrates that the morphology has not been properly evaluated, an impression that the present study has the objective of altering. The important structure for scaphopods additionally includes the above mentioned differences that, so far, have upheld the two traditional orders nodes 3 and 4.
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The ligament and digestive system in ceohalopoda taxodont bivalves. Thin internal layer of circular muscles surrounding posterior half of foot, with thickness about half of external layer of longitudinal muscles. Beyond samples from Florida, some species from other regions and other taxa were selected in order to provide scenarios and outgroups for comparative analyses.
Anus simple, sessile Figs.
The final result, if only morphology is applied in the phylogeny at higher levels, must be exposed and debated. Geological Society Special Publication ,