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Description of two new species of Rhynchelmis (Oligochaeta :Lumbriculidae) from Lake Baikal (Russia), using classicalmorphology and ultrastructure of spermatozoa

Published online by Cambridge University Press:  01 February 2009

P. Martin ,
M. Ferraguti  and
I. Kaygorodova
P. Martin
Affiliation:
Institut royal des Sciences naturelles de Belgique (IRScNB), Section Biologie des Eaux douces, 29 rue Vautier, B-1000 Bruxelles, Belgium
M. Ferraguti
Affiliation:
Dipartimento di Biologia, Université di Milano, Via Celoria 26,1-20133, Milano, Italy
I. Kaygorodova
Affiliation:
Limnological Institute, Siberian Branch of the Academy of Sciences of Russia, Ulan-Batorskaya 3, 664033 Irkutsk, Russia
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Abstract

The study of new samples of oligochaetes from Lake Baikal (Siberia) made possible description of two new species of the genus Rhynchelmis, R. alyonae sp. n. and R. shamanensis sp. n. Rhynchelmis alyonae sp. n. has modified genital setae, a character mentioned for the third time in the Lumbriculidae. These species belong to a complex of small Rhynchelmis, characterised by two pairs of testes, two pairs functional sperm funnels, no connection between spermathecae and gut cavity, and short, elongate, straight atria extending, at most, into segment XII. Other representatives of this group are R. olchonensis, R. paraolchonensis and probably R. spermatochaeta. The Hrabe specimens of R. olchonensis are not considered to belong to this species and are included into R. shamanensis sp. n. An examination of the ultrastructure of spermatozoa of R. alyonae sp. n. indirectly gives some support to the validity of this group. The group is suspected to harbour other new species in Lake Baikal where it seems more and more to constitute a species flock.

Keywords

aquatic oligochaeteslumbriculidaerhynchelmistaxonomyBaikaloligochètes aquatiqueslumbriculidaerhynchelmistaxinomieBaïkal
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 34 , Issue 3 , September 1998 , pp. 283 - 293
Copyright
© Université Paul Sabatier, 1998

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