Amphineura sentence example

amphineura
  • Amphineura (see Chiton).
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  • A similar modification of the velum occurs in Dentalium and in Myzomenia among the Amphineura.
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  • The Chitonidae and the Aplacophora are now separated from the Gastropoda and raised to the rank of a distinct class, under the name of Amphineura.
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  • Among the Amphineura we find one pair of coelomic ducts in the Aplacophora, two pairs in the Chitons.
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  • This is the condition of the nervous system found in Chiton and the other Amphineura, but may not be in all respects the ancestral condition.
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  • Hermaphroditism is secondary, and occurs in one sub-class of Gastropoda, in some Lamellibranchs, and in one sub-order of Amphineura.
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  • True viviparity, that is the development of the ova within the oviduct, is very rare, occurring only in one case among the Amphineura and in some aquatic and pulmonate Gastropoda.
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  • Paul Pelseneer (1906) raised the group to the rank of a class of Mollusca, under von Jhering's name Amphineura.
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  • The most important theoretical question concerning the Amphineura is how far do they represent the original condition of the ancestral mollusc?
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