L. Forró - É. Murai szerk.: Miscellanea Zoologica Hungarica 5. 1989 (Budapest, 1989)

Hołyńska, M.; Hołynski, R.: Scapholeberis erinaceus Daday, 1903 (Crustacea: Cladocera) at Bátorliget (Hungary)

DADAY's original material - collected at Balatonkeresztúr, Kéthely and Fonyód - consists of four vials, deposited in the Zoological Department of the Hungarian Natural History Museum. Holotype has not been designated, thus we selected one of the parthenogenetic females from the vial labelled: "

Scapholeberis erinaceus Daday, Fonyód, VANGEL, 1902, Typus, Collectio Dadayana, Cladocera 11-330" as the lectotype. This particular specimen has been chosen because of its relatively good condition, in spite of the fact, that its postabdomen is not visible (all specimens with produced postabdomen being damaged) and its body measurements differ from those given in the original description. This disparity is common to all members of the type-series and is certainly due to post-mortem shrinkage caused by fixatives. Our measurements of the lectotype, and those given by DADAY (1903) for all his material, are given in Table 1. The Bátorliget material was collected on 14, 16, and 19 August 1985, and on 13 July 1986 in a temporary, shallow, muddy pool, populated mostly by sedges, Carex spp. ; a detailed description of the sampling stations, as well as of the Bátorliget relict mire in general, is given by LEGÁNY (1984) who is the same person as the first author of the present paper. A plankton net of 21 _/im mesh size was used, the material was fixed immediately in formaldehyd (ca 5% solution). We have found 8 parthenogenetic females and 36 juveniles in 1985, and 23 parthenogenetic females, 22 ephippial females, and 2 juveniles in 1986. This relatively rich material enabled us to compare the morphology of various age categories and the two forms of adult females. The scheme of measurements is shown in Fig. 3. Samples usually contain only females, only MANU I LOVA (1964) and HOLLWEDEL (1984) found males in Siberian and Hungarian materials, respectively. Unfortunately, they compared their specimens merely with adult females, but they did not mention any characters distinguishing the males from juveniles, which differ from adult females exactly as described for the specimens in question. We had the possibility to study the male specimen found by HOLLWEDEL (19 84); the claw of the first thoracic leg (Fig. 2) proved to be very distinctive in S. erinaceus

, too. Some differences in body shape (dorsal line is more straight) also seem to distinguish adult males from older (5. instar! female juveniles, but this remains to be confirmed by studying a more representative sample. We found several differences between the morphology of parthenogenetic and ephippial females. In ephippial females (Fig. 4) the dorsal part of testa is deeply longitudinally depressed along the midline from the distinct hump just behind the head to the almost completely obliterated dorsoposterior angle, in the parthenogenetic form (Fig. 5) there is no signe of an anterior hump. The dorsal surface is strongly convex without any depression, and the dorsal line meets the posterior margin in a distinct, protruding angular protuberFig. 3. Scheme of measurements 1= total body length; 2= length of mucro; 3 = Fig. 2. Scapholeberis erinaceus Daday, 1903 maximal height of body; 4= length of head A; Male, first leg, from Hollwedel's material 5= length of head B; diameter of eye is the mean of long and short axes