Sensillae of the limbs of Cladocera are described with emphasis on Eurycercus lamellatus

Smirnov, N.N.

English

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SMIHNOV, N.N. 1967 Zool. Zh. 46, 286-88. 
On the sensillae of the limbs of Cladocera. 
The sensillae on the trunk limbs of Cladocera were first described in 
1962 by Fryer (G. Fryer, 1962, 1963,) detecting them in the females of 
Eurycereus lamellatus, (O.F. Mülller.) On the basis of the structure and 
arrangement of these sensillae Fryer considers that they serve for distin-
guishing the taste of food. The female E. lamellatus has singly a sen-
silla in the limbs of the 3rd, 4th and 5th pairs and the length of the sen-
sillae is about 45M-
We found such sensillae singly on limbs 3 and 4 of males of Alona 
affinis (Leydig,) on limbs 3 of males of Eurycercus lamellatus, Acroperus 
harpae (Baird), Alonopsis ambigua, lilljeborg, Chydorus globosus Baird, on 
3rd limbs of females of Alona quadrangularis (O.F. Mülller), alonopsis ambigua, 
Camptocercus lilljeborgi Schoedler, Chydorus globosus, Ch. sphaericus (O.F. 
Müller), Pleuroxis laevis G.O. Sars, P. truncatua (O.F. Müller) (syn. Peracantha 
truncata), P. uncinatus Baird, and on the fourth limbs of females of P. aduncus 
(Jurine) (fings. 182). Thus, sensillae of the trunk limbs are possessed by 
specimens, essentially differing in a number of respects, of groupings of 
genera of the family Chydoridae (group Eurycerus, group Chydorus and Pleuroxus, 
group Alona, Alonopsis and Camptocercus; Smirnov, 1966) 
The male Eurycercus lamellatus, the length of which is 1.9 mill has 
sensillae of 24µ length, other crustaceans having length of 0.6-1 mm, have 
sensillae of length within the range 8-l6µ. The sensillae have kinds of 
elongated papillae with blunt tip, at the root somewhat broadened, with thin 
coverings (according to material fixed with formalin). 
The sensillae are arranged at the juncture with the gnathobasal part of 
the endite and directed into the space between the limbs of the right and left 
sides. 
A representative of the near family Macrothricidae - Macrothrix laticornis 
(Jurine) also has sensillae on limbs. On M. laticornis we found a large sen-
I 
silla on the 2nd limbs (fig. 2), wheras it was possible confidently to 
affirm that on the 2nd limb of the 34 species of Chydoridae investigated by 
us there are none. Like the chydorids, in the distal part of the sensillae 
of M. laticornis are apparent strongly light-refracting bodies. 
These sensillae, described very recently may however be found in some 
pictures of limbs published by previous authors. Thus, in the work of 
Dybowski and Grochowski (1898), the sensilla is clearly seen on the 3rd 
limb of the female Eurycercus polydontus Dybowski et Grochowski. A sensilla 
is seen on the drawing of the 2nd limb of M. laticornis in the work of Lund 
(1870). 

ON SENSILLAE OR TRUNK LIMBS OF CLADOCERA 
* N. N. SM1RNOV 
Institute of Pond Fish Culture (Moscow) 
S u m m a r y 
The trunk limbs of 13 species of Chydoridae are found to bear sensillae similar 
to those described by Fryer in Eurycercus lamellatus. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Notice 
 
 
Please note that these translations were produced to assist the scientific staff of the 
FBA (Freshwater Biological Association) in their research. These translations were 
done by scientific staff with relevant language skills and not by professional 
translators. 
 
 
 


On the sensillae of the limbs of Cladocera.  [Translation of: Zoologicheskie Zhurnal 46, 286-288, 1967]

http://aquaticcommons.org/4765/1/8_1967_smir_onth.pdf

On the sensillae of the limbs of Cladocera. [Translation of: Zoologicheskie Zhurnal 46, 286-288, 1967]

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