Miscellanea Zoologica Hungarica 11. 1997 (Budapest, 1997)

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

Description of the holotype (female) Length of the body (excluding furcal seta) = 1060 um; prosome/urosome = 1.62; céphalothorax length/width =1.15 Antennula. (Fig. IB) 17-segmented, last two segments with finely serrate hyaline membrane. Hyaline membrane of segment 17 with one strikingly large notch (Fig. 1C ). Anterior surface of articles 1, 4, 5, 7-14(!) adorned with spinule rows. The armature formula as in M. leuckarti, and M. thermocyclopoides: 8s, 4s, 2s, 6s, 4s, ls+lsp, 2s, Is, Is, 0, Is, ls+lae, 0, Is, 2s, 3s, 7s+ae (Fig. ID). Some of the setae on the holotype were broken off, therefore the real armature had to be reconstructed by the use of other specimens as well. Antenna. (Fig. IG) Coxa, basis, and three-segmented endopod with 0, 3, 1, 7, 7 setae respectively. Basis, caudal spinule pattern (Fig. IE, I): near base long spinules on outer rim, very small ones on inner rim; next to spinules on outer rim oblique row of spinules; longitudinal row of 14 distally growing spinules along the outer rim; oblique row of very fine spinules, starting from ca. half of inner rim; group of small spinules next to implantation of inner setae; tiny spinules next to the distal rim of basis in one of two antennae. Basis, frontal spinule pattern (Fig. IF): longitudinal row of 22 spinules on outer rim; no spinule group next to implantation of exopod seta; transverse row of tiny spinules near base of segment. Labrum. (Fig. 1J) Distal margin toothed. On external (ventral) surface two longitudinal ridges, each bearing one transversal row of long hairs. Paragnath. (Fig. 1K) Ventral armature: medialmost lappet with spinules; longitudinal row of teeth in distal third of inner rim; two longitudinal rows of setules, external ones longer and proximally shifted; on inner side of paragnath large serrate teeth, perpendicular to its axis. Mandibula. (Fig. 2D) Gnathobase with strongly chitinized teeth. One segmented palp with two long and one short setae. Near the palp three groups of spinules on frontal surface. Spinule-like structures on praecoxa. Maxillula. (Fig. 2B) Praecoxal arthrite with three claws distally, at their base one spiniform seta on ventral surface. The largest, setulose seta on the inner rim is broken off in the holotype. Two medium-sized and three small spiniform setae on inner rim, and small spine at base of praecoxal arthrite. Palp (Fig. 1H) with one spine and two setae apically, one, external seta proximally, and three seta on external lobe. No spinules on palp. Maxilla. (Fig. 2A) Syncoxa, basis, and one-segmented endopod. Praecoxa bears one endite with two setae, coxa has one endite with one seta (broken off in the holotype) in distal two thirds, and one distal endite bearing one spiniform apical seta, and one ca. half as long, slender subapical seta. Basis with two setae, shorter seta placed caudally, the longer one inserted in front of the claw-like basal endite armed with strong teeth. One-segmented endopod with five setae. Two small setae of endopod inserted on caudal surface of external spiniform setae, near its articulation on endopod. Coxa with longitudinal spinule rows on frontal surface. Maxilliped (Fig. 2C) Syncoxa, basis and two-segmented endopod. Coxa with three inner setae. Basis with one inner (broken off in the holotype) seta at distal third, and one spiniform seta shifted to frontal surface. Caudally two groups of spinules near outer margin. Long spinules on inner margin and frontal surface below the insertion of basal setae. Enpl with one stout seta and few spinules on frontal surface. Enp2 with three setae of increasing length from outermost to innermost.