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Family Cypridinidae
Fam. Cypridinidae, G. 8. Br AD Y and A. M. Norman, 1896, p. 638.
Sub-Fam. CypridininaeSub-Fam. Philomedinae (part.), G. W. Müller, 1906 b. p. 12.
„ „ n 1912, pp. 8, 24.
Description: — Shell: — With or without sexual dimorphism. —The rostral incisur
is in most forms rather deep, in others, on the contrary, more or less shallow, but is never,
however, quite absent; the upper lip of the incisur does not grow over the under one. The selvage
varies in type, but is always lamelliform and most frequently well developed both on the
rostrum and along the greater part of the ventral margin of the shell; it runs about parallel
to and somewhat within the free edge of the valve. The list runs from the rostral incisur in
an even, unbroken bow along the ventral and posterior edge of the shell, and finishes at the
back near the hinge of the shell (exception among the hitherto known forms: Siphonostra and
Cypridinodes, ef. below, the diagnoses of these sub-genera); it is sometimes narrow throughout
its whole length or else somewhat broader at the back; the distance from the list to the edge
of the shell is, on the average, somewhat greater along the back edge of the shell than along
the ventral edge. The valves, as in all forms belonging to the Ostracod s, are joined
along less than liait the periphery; in only a single one of all the genera so far known, the genus
Gigantocypris (cf. below, the diagnosis of this genus) are they joined along more than half the
periphery of the valves. The males never have a ring of hairs round the posterior part of the shell.
First antenna: — This has more or less strongly marked sexual dimorphism.
— The sensory bristle of the fifth joint developed very variously, sometimes entirely absent
in the females. The original sixth joint has always only one bristle, placed distally-medially.
Distally this limb has seven to eight bristles, three to four of which are probably to be
considered as belonging to the original seventh joint and four to the original eighth joint. The
anterior bristle on the original seventh joint (a-bristle, cf. below, the terminology for the
sub-family Cypridininae) is never developed in the shape of a claw.
Second antenna: — In a number of forms this limb is characterized by sexual
dimorphism, in others it is almost or entirely without it. — Endopodite: In the female
most frequently rather small and weak, sometimes even more or less entirely reduced. In the
male this brauch is sometimes of the same type as in the female, sometimes it is developed as
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