Discussion of Phylogenetic Relationships
The two families of the Myopsida appear to be closely related. The Australiteuthidae differs from the Loliginidae primarily in the structure of the funnel/mantle locking-apparatus and the position of the mantle component which does not reach the mantle margin. A number of features of phylogenetic importance in the Australiteuthidae, however, are not known: the presence or absence of a branchial canal, an anterior eye pocket, circularis muscles in the suckers, an interstellate connective; the location of spermathecae; the symmetry of the gills; the type and place (pelagic or benthic) of deposition of egg masses and the position of the intestine relative to the cephalic vein and the vena cavae.
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