Miscellanea Zoologica Hungarica 11. 1997 (Budapest, 1997)

Hołyńska, M.: A new representative of Mesocyclops thermocyclopoides-circle (Copepoda: Cyclopoida) from India

Leg 1-4. Spine and seta formula as in M. leuckarti and M. thermocyc

lupoides (Table 2). Group of small spinules in semicircular arch on frontal surface of leg 1 basis (Fig. 2H). Lateral rim of leg 1-4 coxa with hairs. Apical part of medial expansion of leg 1 -4 basis bearing hairs. On medial expansion of leg 4, proximal group of few long hairs caudally also present. Intercoxal sclerite of leg 4 haired on caudal surface (Fig. 2E), naked frontally. No hairs either frontally or caudally on intercoxal sclerite of leg 1-3. Two small acute outgrowths on intercoxal sclerite of leg 4. Caudal armature of leg 4 coxa (Fig. 2F): intermittent group of large spinules (6+5) near distal rim; oblique, oblique row of long spinules inserted side by side on outer distal corner; long hairs next to and on lateral rim; many small spinules in 2 or 3 rows near proximal rim. Leg 4 enp3 (Fig. 2G): length/width = 2.55; inner apical sp/outer apical sp = 1.22; inner apical sp/enp3 length - 1.0; outer edge of inner apical spine, except the proximal third, with teeth at full length . Table 2. Armature of leg 1-4 of Mesocyclops dadayi sp. n. (Spines are denoted by Roman-, setae by Arabic numerals. The armature on theouter margin of any segment is given first, it is followed by the elements on the apical and inner margins) Coxa Basis Exopod Endopod Leg 1 0-1 1-0 1-1; I-1; 1-11,1-2 0-1; 0-2; 1-1,1-3 Leg 2 0-1 1-0 1-1; I-1; 1-11,1-3 0-1; 0-2; 1-1,1-3 Leg 3 0-1 1-0 I-LI-l; 1-11,1-3 0-1; 0-2; 1-1,1-3 Leg 4 0-1 1-0 I-LI-l; 1-11,1-3 0-1; 0-2; 1-II-2 Leg 5 (Fig. 3A) Segmentation and armature as typical of the genus. Spiniform (inner) seta of exopod/seta of bascoendopod = 0.74. Apical exopod seta ca. half as long as the genital double somite. Leg 6. Long medial seta and two short spines of about equal length. Pediger 5 (Fig. 3B) Laterally and dorsally haired. Genital double somite. (Fig. 3A, B) Dorsal surface densely haired in proximal half . Receptaculum seminis. (Fig. 3A) Lateral arms short, weakly curved posteriorly; anterior margin of proximal part strongly concave in the middle; horseshoe-shaped copulatory pore moved upward to the level of the transverse ducts (posterior margin of proximal part); transverse ducts do not form acute angle ("V-shaped") before their connection with copulatory duct (pore canal); part of copulatory duct connecting copulatory pore and transverse ducts is not recognizable; two hardly discernible - light microscope observations leave some doubt about their presences - circular pores posterior to copulatory pore; copulatory duct curved, with ring-like structures at full length (Fig. 3C). Anal segment. (Fig. 3D, E) Distal margin with several well-developed spinules ventrally, and only few small medially shifted ones on dorsal surface. Furca. (Fig. 3D, E) Length/width = 3.40; dorsal s/posterolateral s = 1.33; length of apical setae from innermost to outermost: 195 (m, 380 (m, 265 (m, 70 (m; longest furcal s/urosome length = 0.94. Spinules at base of insertion of posterolateral furcal setae only. Hairy medial and ventral surface.