Bactrochondria hoi, (Pillai, 1985)

Bactrochondri a hoi ( Pillai, 1985)

( figures 5-6 View FIG View FIG )

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

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

Antennule ( figure 5F View FIG ) fl eshy, with inflated base tipped with a short, setae-bearing process; armature being (from proximal to distal) 1-1-1-2-2-8. Antenna ( figure 5G View FIG ) two-segmented; terminal segment sharply curved (broken in dissected specimens), with annular sculptures in bent area. Labrum ( figure 5H View FIG ) with posterolateral knob and smooth posterior margin. Terminal blade of mandible ( figure 5I View FIG ) bearing 22 to 24 teeth on convex (inner) side and 13 to 16 teeth on concave (outer) side. Maxillule ( figure 5J View FIG ) with two terminal elements and a subterminal process tipped with three tubercles. Maxilla ( figure 5K View FIG ) two-segmented; first 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 ( figure 5L View FIG ) three-segmented; constructed roughly as in B. papilla with subchelate appearance. Leg 1 ( figure 6A View FIG ) and leg 2 ( figure 6B View FIG ) as in B. papilla .

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

Remarks. In addition to the three differences 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.