Dr. Éva Murai szerk.: Miscellanea Zoologica Hungarica 2. 1984 (Budapest, 1984)
Subchev, A. M.: On Hungarian Branchiobdellids (Oligochaeta: Branchiobdellidae)
chelae. This subspecies, described as B. pentodonta orientális POP, 1965, is known for Hungary from material collected in Újbánya, the host is not mentioned (POP, 1965). Later this subspecies was synonymized to B. balcanica balcanica by KARAMAN (1970). Branchiobdella pentodonta. 27 specimens of this species were collected on Astacus as- tacus L. from the Bükk National Park, Csernely-patak (a small brook), Hungary; they include 11 mature and 16 unmature worms. The branchiobdellids were fixed in 80% alcohol and than examined by means of a stereoscope; two of the mature worms were dissected and the reproductive system and the jaws were removed for more detailed investigations. The material was identified as B. pentodonta by the form of the body and the form of the jaws and the reproductive system. No differences from the original description of the species and from Bulgarian material were found. The body of the fixed mature worms is dorso-ventrally flattened, but the extension from the 3rd to the 6th trunk segment is gradual, unlike in the previous species; the jaws are similar to the jaws of B. balcanica balcanica. In addition to this there is a certain distinction between the reproductive systems of B. pentodonta and B. bal canica respectively. In B. pentodonta the glandular part of the atrium is distinctly longer than the nonglandular one (ductus ejaculatorius) while the situation is vice versa in B. balca nica balcanica; in B. pentodonta the duct of the spermatheca is shorter than its length and well defined, and in B. balcanica balcanica the duct is relatively longer and no distinct dividing line between the theca and the ductus is visible as is the case in B. pentodonta. For all Hungarian species except B. pentodonta and B. balcanica the form of the jaws is a reliable feature for identification. In addition to this the fixed material of the species could be divided in two groups (which is useful for preliminary identification): big branchiobdellids (mature worms usually longer than 5 mm) - B. astaci and B. parasita and mediumsized branchiobdellids (mature worms usually shorter than 5 mm) - B. hexodonta, B. pento donta and B. balcanica. KEY TO THE HUNGARIAN SPECIES OF THE GENUS BRANCHIOBDELLA 1. Jaws triangular 2 Jaws not triangular, with 5 or 6 teeth , 3 2. Jaws equal in size B. parasita Dorsal jaw more than twice larger than ventral one B. astaci 3. Jaws with long lateral and equal in size 3 or 4 medial teeth B. hexodonta Jaws with lateral and medial teeth larger than others 4 4. Body widening gradually from 3rd to 6th trunk segment, glandular part of the atrium distinctly longer than nonglandular B. pentodonta 4th trunk segment in mature worms distinctly wider than 3rd; glandular part of atrium distinctly shorter than nonglandular B. balcanica The sixth European branchiobdellid species - B. italica is not expected to be found in Hungary since its only host Austropotamobius italicus, does not inhabit this country. So far the remaining species, B. kozarovi , is known only from Bulgaria and the Ukraine (BOSHKO, 1983). ACKNOWLEDGEMENTS are due to Dr. L. FORRÓ, for the material of B. pentodonta.
