For an explanation of the dynamics of numbers of chydorids, appearing a massive group in the littoral of fresh water bodies, the structure of the limbs of 29 species was studied

Smirnov, N.N.

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Structure of the limbs and its significance for the ecology 
and systematica of the family Chydoridae. 
by N.N. SMIRNOV. 
For an explanation of the dynamics of numbers of chydorids, 
appearing a massive group in the littoral of fresh water bodies, the 
structure of the limbs of 29 species was studied. 
2. Data on the structure of the limbs participating in 
movement, feeding and respiration, necessary for the understanding 
of these processes, essentially supplement the specific descriptions 
and appear new bases for the systematics of the family. Recieved 
material together' with data of previous authors for 16 species represents 
18 genera out of the 21 genera of the family of Chydoridae. 
3. The structure of the limbs is of the same type within the 
limits of the family. Within the limits of the genus the structure 
of the limbs is very uniform, between genera there are differences. 
A study of the structure of the limbs of males of 11 species showed 
that only the limbs of the first pair differed from the limbs of 
the female. 
4. The structure of limbs I, II, III of the studied species are 
uniform. Limbs V (and VI if present) display features of simplification 
(diminished number of setae). The exopodite of IV limbs in represent-
atives of different genera has 8, 7, or 6 setae, each distinct in 
number combined with absence of hind setae. 
5. On the basis of distinction in the structure of the limbs 
of. the IV pair (being supported by other indications) 
are planned 3 groups of genera: 1) exopodite of IV limb with 8 setae — 
Eurycercus, Saycia; 2) exopodite of IV limb with 7 setae -
Pleuroxus,(including Peracantha), Dunhevedia,Alonella, Chydorus, 
Anchystronus; 3) exopodite of IV limb with 6 setae - Camptocercus, 
Acroperus, Alonopsis, Alona, Oxyurella, Leydigiopsis, Leydigia, 
Graptoleberis, Euryalcna, Rhynchotalona, Monospilus, 
6. The same groups are contemplated on the basis of structure 
of the head pores(with this difference, that Monostilus stands apart) 
The structure of the IV limbs and head pores appears a new indication, 
allowing reliably to distinguish to the genera Alonella and Alona. 
7. Within the limits of the second and third groups there are 
both weed(-living) and silt-living species, i.e. ecological special-
isation does not coincide with morphological. 
25 Voprosy gidrobiologii. 1965, Moskva. p. 385 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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. 
 
 
 


Structure of the limbs and its significance for the ecology and systematics of the family Chydoridae.  [Translation of: Voprosy Gidrobiologii, p385, 1965]

http://aquaticcommons.org/4766/1/9_1965_smir_stru.pdf

Structure of the limbs and its significance for the ecology and systematics of the family Chydoridae. [Translation of: Voprosy Gidrobiologii, p385, 1965]

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