биота российских вод японского моря - Materials of Alexey Shipunov

The class Pycnogonida is currently divided into no larger taxa than families. Thesection on sea spiders is based on the taxonomic system proposed by Schimkewitsch(1929) with minor later additions and changes (Hilton, 1942a,b; Hedgpeth, 1948;Pushkin, 1993). Ten families are established within the class, namely: Ammotheidae,Nymphonidae, Callipallenidae, Phoxichiliidae, Austrodecidae, Colossendeidae,Decolopodidae, Rhynchothoracidae, Endeidae, and Pycnogonidae.At present there are 50 species of the pycnogonids registered for the Sea ofJapan, belonging to 17 genera and 6 families, of which 21 species of 7 genera and 4families occur in the Russian waters of the Sea of Japan. The taxa which have not yetbeen found in this region are marked with an asterisk (*).Systematic partKEY TO THE FAMILIES OF THE CLASS PYCNOGONIDA1(8). Adults have chelifores; in some species chelifores reduced to small buds.2(5). Both sexes have palps, consisting of 5 to 10, or 20 segments.3(4). Chelifore strong, longer than proboscis, with 2 segments; fingers of chela haveteeth or tubercles on inner margin; palp consists of 4–7 segments .................................................................................................................. I. Nymphonidae (p. 94)4(3). Chelifore feeble, shorter than proboscis, with 1–3 segments; fingers of chelareduced, or not reduced, but without teeth on inner margin; palp of both sexesconsists of 8–10, or 20 segments ................................. II. Ammotheidae (p. 105)5(2). Palp absent, or consists of 1–4 segments.6(7). Both sexes have ovigers composed of 9–10 segments, with compound spines on4 distal segments ..................................................... *III. Callipallenidae (p. 119)7(6). Only males have ovigers composed of 5–6 segments ...... ....................................................................................................................... IV. Phoxichilidiidae (p. 122)8(1). Adults without chelifores.9(10). Palp consists of 8–9 segments; oviger of both sexes consists of 10 segments,with claw and several rows of compound spines ............ .......................................................................................................................... *V. Colossendeidae (p. 127)10(9). Palps absent; ovigers absent or present only in males, with 7–9 segments .............................................................................................. VI. Pycnogonidae (p. 129)I. Family NYMPHONIDAE Wilson, 1878Trunk elongated and divided into segments (excluding the genus Paranymphon);segment 1 with broad anterior part and narrow middle one, forming neck. Cheliforelong, 2-segmented, with well-developed chela. Palp longer than proboscis, consists of4–7 segments. Oviger of both sexes consists of 10 segments, segments 7 to 10 havecompound spines placed in single row. 4–6 pairs of legs present.Only one genus of this family is represented in the Sea of Japan.94