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The naines uf iltese
mani groups.
Sunvnary oj the
differences between my
opinion of the
fundamental classification
of the recent
Ostra-cods and that of
G. O. Sars and
G. W. Midler.
1 did not think it convenient to use the nomenclature introduced bv G. O. Sars for
these groups. It seems unsuitable for the following reasons. The names Myodocopa and
Podocopa have been used by preceding writers in different senses; if the name Myodocopa is
retained for the Cypridinids or for the Halocyprids, it would be used in a new
sense, differing from both G. 0. SARS’ and G. W. MÜLLEr’s view. If we retain the names
Myodocopa, Cladocopa, Podocopa and Platycopa it would be impossible to introduce a thoroughly
consistent nomenclature. G. 0. SARS took these names from the structure of the second
antenna in the different groups: Myodocopa refers to the muscular structure of this limb,
[xuwcbjç et xwTtyj, „the muscular oar“*. Cladocopa refers to the faet that both the exopodite and
the endopodite are developed as natatory implements, xÀâdoç et „the branched oar“.
Podocopa refers to the faet that this limb is developed as a crawling leg, ~oåoc et xwm, „the
leg-shaped oar“. Platycopa refers to the flatness of the same appendage, -Àa-toç et xwrcrj,
„the flattened oar“. It seems impossible to find a suitable analogous name for C y p r i d i n i d s
and Halocyprids, as these groups have second antennae of almost quite the same type.
It is also to be noted that the term Cladocopa suits one genus among the Halocyprids
as well, namely Thaumatocypris.
For these reasons it seems to me most convenient to give quite nëw names to these five
groups, which, according to G. W. MÜLLER, may be termed sub-orders. I have chosen for them
the terms: Cypridiniformes, Halocypriformes, Polycopif ormes, Cypriformes and Cytherelliformes.
The difference between G. 0. SARS’, G. W. MÜLLEr’s and my classification is shown in
lo wing table: 1 H alocypriformes
Myodocopa G. W. MÜLLER Myodocopa G. 0. Sars 1 Cypridiniformes
Cladocopa „ „ ,, [ Polycopif ormes
Podocopa ,, ,, ,, 1 Podocopa ,, ,, ,, { Cypriformes
\ Platycopa ,, ,, ,, [ C y ther elli for mes.
The mutual relations
of my five main
groups.
C y pr idin i formes.
H dlocy pr if ormes
and
Po ly co p i form es.
The question of the mutual relations between these groups seems to be exceedingly
difficulté to answer satisfactorily.
G. W. Müller assumes that Halocyp riformes and Polycopif ormes
are more closely related to each other than they are to Cypridiniformes;
Polycopi-formes are to be considered as a small brauch of the first-mentioned group, a branch
that has preserved primitive features in a number of respects. The characters that show
the doser relationship of these two groups would be the position of the first antenna high
up on the forehead and the misymmetrical exit of the sexual organs. I think that G. W.
Müller has been somewhat too hasty in this déduction. These two characters, the place
of attachment of the first antenna and the way in which the sexual organs open out,
* G. O. Sars writes, 1865, p. 10: „Den sidste Del af Sammensaetningen, xamr), Aare, er specielt anvendl
paa disse Antenner, da deres Betydning som Bevaegelseorganer er noget, man vil finde mere eller mindre tydeligt udpraeget
gaar igjennem den hele store Krebsdyrafdeling. Entomostraca. (The last part of the compound, xcéîtïj, oar, is specially
used for these antennae, as their importance as locornotory organs will he found moro or less marked throughout the
u hole great Crustacean group Entomostraca.)
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