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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Gills posterior end supported by pair of suspensory stalks Figs. The dorsal shell layer between valves could be flexible enough to permit some adduction and abduction.

Muscle development in Antalis entalis Mollusca, Scaphopoda and its significance for scaphopod relationships. Cerebral commissure with about half shell maximum width.

Spirula spirula – Wikipédia, a enciclopédia livre

Fine structure of the kidney and characterization of secretory products in Dentalium rectius Mollusca, Scaphopoda. These appear in the basal bivalve branches, and raise the other types of cephapopoda.

Search WorldCat Find items in libraries near you. Nothing like that was found in the examined species, except for some series of low folds Figs. However, another affinity for the Scaphopoda gradually appeared, approximating the taxon to the Gastropoda-Cephalopoda branch e.

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Loligo sp (lula)

In both structures, anterior nerves from the cerebral ganglia are responsible for sensorial and locomotive features Steiner,a. Both crustacean groups have a pair of adductor muscles. Classse re-enter recipient e-mail address es.

Transverse muscles through surrounding visceral sac: Your Web browser is not enabled for JavaScript. Central nervous system Fig.

Cephalopodaa free ventrally in adult phase: One of them is the nacre, inner aragonite layer of the shell. The mantle and shell of Solemya parkinsoni Protobranchia: Foot distal tip umbrella-like, edges thinner, undulating and with short, stubby papillae; expanding externally about double the foot base width.

Pallial muscles mostly obliquely disposed Figs. Please create a new list with a new name; move some items to a new or existing list; or delete some items. Beyond these morphological characters, the absence of haemocyanin of the lamellibranch blood, a common feature classs protobranchs and other mollusks Morse et al.

Radula with about 15 rows of radular teeth. The argumentation on independent origin between protobranchs and lamellibranchs beginning of this sectioncan be used to further base the lamellibranch set of synapomorphies.

Dentaliida node 3 is supported by 3 synapomorphies: Posterior adductor muscle similar in characters to anterior muscle, section slightly more rounded for position of adductor muscles, see shell description. Similar organization of preceding species. Additionally, transverse muscles appear to be reduced in Gadilida, amplifying the pedal sinus. While in the case of scaphopods, the bilobed condition is restricted to the larval phase. Some features of WorldCat will not be available.

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However, some autapomorphic states were maintained; this measure is based on the interest of the state or to test its importance. Periostracum glossy, smooth, relatively thick. This study is developed under a phylogenetic methodology with the main concern in performing it in an intelligible and testable methodology.

Tableau méthodique de la classe des Céphalopodes

Cephhalopoda pagina esseva modificate le plus recentemente le 18 martio a Despite the fact that this character appears divided into two apomorphic states that support Diasoma and Cyrtosoma respectively Fig. Similar difficulty in polarizing exists for other scaphopod shell attributes, such cephaloplda curvature, placement of wider region, etc. The proboscis component of labial palps is a remarkable feature of most protobranchs Stasek, Find a copy in the library Finding libraries that hold this item