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Family I. Cypridae, with the sub-families Cyprinae and Cytherinae
,, II. Halocypridae. ,. .. ,, Cypridininae and Halocyprinae.
This classification may be said to form the basis for the present system of the
Ostracods.
On the basis laid down by J. D. Dana G. O. SARS went further. The classification used
by this latter author in his work „0 v e r s i g t a f Norges marine Ostracode r“.
1865, is particularly noteworthy, partly because it established two new main groups based
on forms quite or almost quite unknown to previous writers, partly because in this work the
naines now used for the large main groups were used for the first time. This writer divides
the Ostracods into four main groups, comprising six families altogether:
I. Podocopa, comprising the families Cypridae and Cytheridae.
II. Myodocopa, ,, ,, ,, Cypridinadae and Conchoeciadae
[II. Cladocopa, ,, .. family Polycopidae
IV. Platycopa, „ „ „ Cytherellidae.
Most of the investigators who have worked in this field have adopted the foundation
of the Ostracod system as accepted by G. < h S A RS without any alteration at all. G. W. MÜLLER,
who is undoubtedly our greatest Ostracod expert, has, on the other liand, somewhat modified
this system. In his large monograph on the Ostracods of the Bay of Naples he has
returned to the classification into two main groups adopted by J. D. Dana. On p. 202 in this
work he classifies the Ostracod world as foliows:
Tribus I. Myodocopa, comprising the families Cypridinidae, Halocypridae and Polycopidae
,, II. Podocopa, „ .. .. Cypridae, Nesideidae, Cytheridae, Cytherellidae
Which oj the systems
o/ the previous
nuthors is the most
natur al?
and Darwinvlidae.
In other words, of G. O. SARS’s four groups G. \Y. MÜLLER combines Cladocopa and
Myodocopa on the one hånd and Platycopa and Podocopa; on the other. In his later works too,
even in the one published most recently, 1012, G. W. MÜLLER uses this classification. Only
one writer has adopted his view, namely T. R. R. Stebbing in a work of 1910.
( )nly one author, namely C. Claus, entirely rejects the main classification adopted by
G. O. Sars. While G. W. Müller states in 1894, p. 188, that „die gesammten
Ostracod e n sondern sich in zwei scharf getrennte Unterordnungen — Podocopa und Myodocopa“,
we find the following statement in C. Claus’s work of 1876, p. 97: „Sie“ (Cypridinidae) „würden
den Cytheri den und Cypriden des süßen Wassers gegenüber in eine besondere
Unterordnung zu bringen sein, wenn nicht die marinen Halocypriden in der inneren
Organisation den Cypridinen nahe verwandt, im Bau der Gliedmaßen unmittelbar zu
jenen beiden Familien hinführten und somit als Uebergangsgruppe eine schärfere Scheidung
der aufzustellenden Unterordnungen verhinderten“. C. Claus also défends the saine view
in his later works, e. g. 1891a, p. 6. We thus see that this writer divides the Ostracod group
directly into families.
Are we to consider that any of these three authors, G. O. SARS, C. Claus and G. W.
Müller, is correct? In other words w h i c h fundamental classification o f
the O s t r a cod s i s t o b e consider e d m o s t n a t u r a 1?
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