Bactrochondria hoi, (Pillai, 1985)

Ju-Shey, 2000, Chondracanthid copepods parasitic on flatfishes of Kerala, India, Journal of Natural History 34 (5), pp. 709-735 : 717-720

Bactrochondri a hoi ( Pillai, 1985)

(®gures 5±6)

Material examined. Nine adult mm (seven with attached l) found on gill ®laments of Cynoglossus lida (Bleeker) : one collected on 11 March 1994 and eight on 20 July 1994.

Female. Body (®gure 5A) elongated and cylindrical, measuring 2.26±3.02 mm long. Head (®gure 5B) longer than wide, 495Ö 385 m m (not including ināted antennule), with small rounded knob at each anterolateral corner and distinctly swollen oral region (®gure 5C). First pediger forming neck region (®gure 5C). Second pediger fused with remaining prosomal somites into a long, cylindrical trunk. Genital double somite (®gure 5D) distinctly wider than long, with abdomen attaching to it like a narrow ring. Caudal ramus (®gure 5E) a spiniform pointed process bearing three setae and a tubercle. Egg sac not seen.

Antennule (®gure 5F) ¯eshy, with ināted base tipped with a short, setae-bearing process; armature being (from proximal to distal) 1-1-1-2-2-8. Antenna (®gure 5G) two-segmented; terminal segment sharply curved (broken in dissected specimens), with annular sculptures in bent area. Labrum (®gure 5H) with posterolateral knob and smooth posterior margin. Terminal blade of mandible (®gure 5I) bearing 22 to 24 teeth on convex (inner) side and 13 to 16 teeth on concave (outer) side. Maxillule (®gure 5J) with two terminal elements and a subterminal process tipped with three tubercles. Maxilla (®gure 5K) two-segmented; ®rst segment robust and unarmed; second segment bearing one small, simple seta, one large seta with hyaline tip and a row of 14 to 18 teeth on terminal process. Maxilliped (®gure 5L) three-segmented; constructed roughly as in B. papilla with subchelate appearance. Leg 1 (®gure 6A) and leg 2 (®gure 6B) as in B. papilla .

Male. Body (®gure 6C) 151 m m long, with swollen cephalosome and cylindrical metasome and urosome. Genital somite (®gure 6D) with usual ventrolateral ridges. Abdomen (®gure 6D) indistinguishably fused with genital somite. Caudal ramus (®gure 6D) a naked spiniform process. Antennule (®gure 6E) short and stubby, armature being 1-1-1-2-1-7. Antenna (®gure 7F) two-segmented and without armature. Mandible (®gure 6G) with fewer teeth on terminal blade, 11 on convex side and ten on concave side. Maxillule (®gure 6H) tipped with three elements. Maxilla (®gure 6I) with 12 to 14 teeth on terminal process. Maxilliped (®gure 6J) two-segmented, lacking terminal claw. Legs 1 and 2 missing.

Remarks. In addition to the three diOEerences enumerated in the Remarks to B. papilla , the two species can be distinguished further by having in the present species more teeth (16±18 vs. eight or nine) on the terminal process of the female maxilla and in lacking legs entirely in the male.