Lamellibranchia sentence example

lamellibranchia
  • and Lamellibranchia.
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  • D, Lamellibranchia.
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  • 'OvrpaKobipuara, shell-bearing Anaema (=Echini, Gastropoda and Lamellibranchia).
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  • Lamellibranchia.
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  • COCKLE, in zoology, a mollusc (Cardium) of the class Lamellibranchia.
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  • Cardium belongs to the order of Lamellibranchia in which the gills present the maximum of complexity, the original vertical filaments of which they are composed being united by interfilamentar and interlamellar junctions.
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  • LAMELLIBRANCHIA (Lat.
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  • The Lamellibranchia are mainly characterized by the rudimentary condition of the head, and the retention of the primitive bilateral symmetry, the latter feature being accentuated by the lateral compression of the body and the development of the shell as two bilaterally symmetrical plates or valves covering each one side of the animal.
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  • The Lamellibranchia present as a whole a somewhat uniform structure.
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  • There are no pores in the foot or elsewhere in Lamellibranchia by which water can pass into and out of the vascular system, as formerly asserted.
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  • The Lamellibranchia live chiefly in the sea, some in fresh waters.
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  • In development some Lamellibranchia pass through a free-swimming trochosphere stage with preoral ciliated band; other fresh (I) ' Av B m 10 ad 3r ?/ a.: a il J FIG.
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  • As an example of the organization of a Lamellibranch, we shall review the structure of the common pond-mussel or swan mussel (Anodonta cygnea), comparing it with other Lamellibranchia.
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  • The gill-plates have a structure very different from that of the labial tentacles, and one which in Anodonta is singularly complicated as compared with the condition presented by these organs in some other Lamellibranchs, and with what must have been their original condition in the ancestors of the whole series of living Lamellibranchia.
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  • Classification Of Lamellibranchia The classification originally based on the structure of the gills by P. Pelseneer included five orders, viz.: the Protobranchia in which the gill-filaments are flattened and not reflected; the Filibranchia in which the filaments are long and reflected, with non-vascular junctions; the Pseudo-lamellibranchia in which the gill-lamellae are vertically folded, the interfilamentar and interlamellar junctions being vascular or non-vascular; the Eulamellibranchia in which the interfilamentar and interlamellar junctions are vascular; and lastly the Septibranchia in which the gills are reduced to a horizontal paltition.
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  • Ridewood, " On the Structure of the Gills of the Lamellibranchia," Phil.
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  • - Lamellibranchia.
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  • The Chitons and their allies were placed under the Gastropoda, as a distinct branch called Isopleura, and for the Acephala de Blainville's name Lamellibranchia was substituted.
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  • The Lamellibranchia are no longer regarded as a distinct branch in contrast to the remaining Mollusca; according to Pelseneer they are allied to the Gastropoda and Scaphopoda, all three classes being derived from a common hypothetical ancestor, called Prorhipidoglossum.
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  • Among the Lamellibranchia again the kidneys serve as genital ducts in the Protobranchia and some Filibranchia.
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  • The latter are represented in the Upper Cambrian formations, together with Lamellibranchia and Gastropoda, and there are no earlier Molluscan fossils than these.
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  • It was present in the ancestral mollusc, occurs in nearly all archaic types, and is only absent in the most specialized forms, in which it has evidently been lost; these forms are certain Neomeniomorpha, all the Lamellibranchia, various degenerate Gastropoda, and the Cirrhoteuthidae among Cephalopods.
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  • In the larvae of several Gastropoda and Lamellibranchia occur excretory organs which have the characters of true nephridia.
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  • The Lamellibranchia have markedly diverged from the original type by the adoption of filtration as a method of feeding.
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  • The sea mussel (Mytilus edulis) belongs to the second order of the class Lamellibranchia, namely the Filibranchia, distinguished by the comparatively free condition of the gillfilaments, which, whilst adhering to one another to form gillplates, are yet not fused to one another by concrescence.
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  • An account of the anatomy of Anodon is given in the article Lamellibranchia.
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  • In 1857 Lacaze-Duthiers raised them to the rank of a division equal to Lamellibranchia.
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  • The nervous system resembles that of Gastropoda and Lamellibranchia.
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  • The organization of the oyster, as compared with that of a typical lamellibranch such as Anodon (see Lamellibranchia), is brought about by the reduction of the anterior part of the body accompanying the loss of the anterior adductor, and the enlargement of the posterior region.
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