Complex morphological novelties on a simple basis: an example of transformation of the female structures of reproductive system into an aberrant copulative apparatus in opisthobranchs molluscsстатья
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Аннотация:Copulative apparatus of opisthobranch
mollusсs is characterized by the high complexity and
frequent presence of hard chitinous structures. The
latter can be roughly classified into solid hooks and
hollow apical stylets. The paper is devoted to additional
study of aberrant copulative apparatus in nudibranchs
molluscs of the group Dunginini (Eubranchidae). This
apparatus does not fit into the above mentioned scheme
and represents a special type of copulative apparatus
within opisthobranchs molluscs. This should be taken
into consideration in phylogenetic studies. The origin
of the aberrant copulative apparatus is discussed.