Ichthydium maximum Greuter, 1917

Trokhymchuk, R. R., 2020, New Reports Of Gastrotricha For The North-Eastern Ukraine, Zoodiversity 54 (5), pp. 349-356 : 354-355

Ichthydium maximum Greuter, 1917 ( fig. 3 , E)

Material. 3 specimens. TL 207–220 µm, al 9–11 µm, pl 63–65 µm, md 8 µm, hw 36–38 µm, nw 33 µm, tw 13,5 µm.

D e s c r i p t i o n. The morphology and the dimensions of the animals collected correspond to the literature data ( Schwank, 1990). Slender body. Head five-lobed with two pairs of cephalic sensory ciliary tufts. Two pairs of dorsal sensory bristles. Furca is short. Both dorsal and ventral sides are naked. Mouth subterminal.

D i s t r i b u t i o n a n d e c o l o g y. Reported from Europe: Great Britain, Poland, Romania, Russia, Switzerland and Japan. Usually reported from eutrophic water bodies ( Kånneby, 2009).

Remarks. This species is reported in Ukraine for the first time.

Family Dasydytidae Daday, 1905

Genus Haltidytes Remane, 1936

Haltidytes festinans (Voigt, 1909) ( fig. 3 , F)

Material. 1 specimen. TL 126 µm, pL 37 µm, md 7.8 µm, hw 45 µm, nw 22 µm, tw 20 µm.

D e s c r i p t i o n. The morphology and the dimensions of the animal collected correspond to the literature data ( Schwank, 1990). Stocky body. Triangular head. Cephalic ciliature composed by 3 paired tufts. Dorsal side has 5 pairs of long crossing spines. Ventrally, beyond the trunk end, saltatorial and caudal spines do not cross. Mouth terminal.

Distribution and ecology. Usually reported from mesosaprobic water bodies ( Sladeček, 1976). Reported from Poland and Brazil ( Kisielewski, 1991). Typical semiplanktonic species.

Remarks. This species is reported in Ukraine for the first time.

A list of all species reported from Ukraine is presented in table 1.

Figures

Fig. 3. Gastrotrichs of the Karyakiv ravine pond: A — Chaetonotus (Zonochaeta) bisacer, B — Chaetonotus (Primochaetus) heideri, C — Lepidodermella minor minor, D — Lepidodermella squamata, E — Ichthydium maximum, F — Haltidytes festinans. Scale bars 30 µm.