Comprehensive Description

provided by Smithsonian Contributions to Zoology
Abasia tripartita (Shiino, 1955)

Alicaligus tripartitius Shiino 1955:56–61.

MATERIAL EXAMINED.—One and 1 from the gills of Synodus ulae Schultz from Wakanoura, Japan. One from the same host from Misaki, Japan. Three collections containing 15 and 2 from the gills of Synodus hoshinonis from Japan.

Female: Body form as in Figure 34a,b. Total length 3.55 mm, greatest width 2.04 mm (measured at widest part of genital segment). Cephalon slightly wider than long (1.42 × 1.27 mm), folded laterally. Thoracic segments fused with cephalon dorsally. Genital segment wider than long (2.04 × 1.37 mm), globular in dorsal view but flattened dorsoventrally, dorsal surface papillose (Figure 41a). Abdomen 2–segmented, nearly as long as wide (1.09 × 1.26 mm); first segment encompassing second laterally, distal corners extend beyond caudal rami. Caudal rami (Figure 34c) longer than wide (106 × 54 μm) armed with 2 outer lateral, 3 terminal, and 1 subterminal plumose setae, longest 189 μm.

Rostrum with distinct frontal lunules (Figures 41b–f, 42a) and ventral rugose area (Figure 42b,c). First antenna (Figure 34d) with 2 segments, about equal in length, armed as in figure, an aesthete on last segment. Second antenna (Figure 34e) not as robust as other species of genus; claw recurved, bearing 2 setae. Mouth tube truncate at tip (Figure 42d). Tip of mandible (Figure 34f) bearing 12 teeth. Strigil within mouth tube (Figure 42e,f). First maxilla (Figure 34g) basically as in other species of genus, bearing one long, stout seta and 2 shorter ones. Second maxilla (Figure 34h; Figure 43a,b) armed as in other species, palmate process (Figure 43c) near base of terminal processes small, longest terminal process with rows of spinules. Maxilliped (Figure 34i) stout, armed as in other species of genus.

Leg 1 (Figure 35a) biramous, basipod with an inner and outer seta; exopod 2–segmented, first segment with a short spine on outer distal corner, second segment with 3 spines and a sparsely plumose seta distally (Figure 43d,e): endopod reduced to a short process bearing a small distal knob. Leg 2 (Figure 35b) basipod with an outer naked seta; exopod 3–segmented, first segment with a prominent outer spinulose spine (Figure 43f) and an inner seta, second segment armed as in first, third segment with 3 outer spines (distalmost longest and fringed with a hyaline membrane along outer edge and short plumosities on inner) and 5 setae; endopod 3–segmented, first segment with patch of prominent spinules on outer distal corner (Figure 44a) and an inner seta, second segment with prominent spinules along outer edge and 2 inner setae, last segment with 6 setae. Leg 3 (Figure 35c) basipod lamelliform, bearing a naked seta and patch of setules on outer edge, a short hyaline membrane and plumose seta on inner edge, and a patch of spinules near insertion of interpodal plate; exopod 2–segmented, first segment heavily sclerotized with a stout spine distally, second segment with 4 setae, outer 3 naked and broad, innermost finely plumose; endopod 1–segmented bearing a patch of setules distally and an inner seta. Leg 4 (Figure 35d; Figure 44b) as in A. platyrostris. Legs 5 and 6 absent. Egg strings of usual caligoid type.

Male: Body form as in Figure 35e. Total length 2.30 mm, greatest width 1.20 mm (measured at widest part of cephalon). Cephalon about as long as wide. Genital segment (Figure 35f) somewhat wider than long (543 × 502 μm), widest anteriorly. Abdomen 2–segmented, first segment wider than long (35 × 183 μm), second segment longer than wide (271 × 230 μm). Caudal rami armed as in female, about twice as long as wide (136 × 71 μm), longest seta 295 μm. Frontal lunule and rostral area (Figure 35g) well developed. Appendages as in female except second antenna more dactylate with second segment bearing rugose areas on inner surface (Figure 35h).
bibliographic citation
Cressey, Roger F. and Cressey, H. B. 1979. "The parasitic copepods of Indo-West Pacific lizardfishes (Synodontidae)." Smithsonian Contributions to Zoology. 1-71. https://doi.org/10.5479/si.00810282.296


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Japan: Wakanora and Misaki
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Ju-shey Ho [email]