Kroyeria longicauda Cressey 1970

Kroyeria longicauda

Figures 64–77

MATERIAL.—Two collections containing 10 collected from between gill filaments of Carcharinus limbatus. Holotype (USNM 128496) and 8 paratypes (USNM 128497) from above host collected 20 August 1965 at Sarasota, Florida.

FEMALE.—Body form as in Figure 64. Total length 3.7 mm. Greatest width 0.6 mm measured at widest part of cephalon. Cephalon slightly wider than long (0.6 × 0.5 mm). Thoracic segments bearing legs 2–4 free. Segment bearing leg 1 (fused with cephalon) with well-developed aciculum 475 μ in length and bearing a subapical accessory process (Figure 65). Genital segment long (2.3 mm), comprising about two-thirds body length. Abdomen 3-segmented, last 2 segments incompletely divided; entire abdomen 0.45 mm long. Caudal rami (Figure 66) about 5 times as long as wide (224 μ × 45 μ), each ramus with outer lateral fringe and bearing 6 setae, 3 naked subterminal and 3 plumose terminal, longest seta 51 μ long.

Oral area as in other members of genus. First antenna (Figure 67) 8-segmented, each armed as in the figure; terminal segment with 12 setae and an aesthete at its tip (Figure 68). Second antenna (Figure 69) of usual chelate type; movable claw fits within cup-shaped tip on immovable claw (Figure 70), short spine on inner border of movable claw. Mouth tube without lateral lobes. Mandible (Figure 71) with few teeth, prominent apical tooth, 2 small subapical teeth, and 2 larger proximal teeth. Second maxilla (Figure 72) with fringed apical process, spinose subapical knob, and subapical patch of hairs. Maxilliped (Figure 73) terminal segment in form of prominent recurved claw.

Legs 1–4 biramose. Rami 3-segmented. Spine and seta formula as follows:

Leg 1

Leg 2

Leg 3

Leg 4

exo

end

exo

end

exo

end

exo

end

Seg. 1

I:0

0:0

I:1

0:1

I:1

0:1

I:1

0:1

Seg. 2

0:1

0:1

I:1

0:0

I:1

0:0

I:1

0:1

Seg. 3

II:4

6

III:4

6

III:4

4

II:4

3

First leg (Figure 74) exopod armed as in figure; endopod first segment with fringe (usually row of hairs on other species) on outer margin, 5 spinules on outer margin of second segment, and 4 small spinules on outer margin of terminal segment. Leg 2 (Figure 75) armed as in leg 1 except for outer spine on second exopod segment and additional spine on last segment. Leg 3 (Figure 76) armed as in leg 2 except for reduced number of setae on terminal segment of exopod. Leg 4 (Figure 77) as in leg 3 except for inner seta present on second segment of exopod and 1 less seta on terminal segment. Leg 5 represented by group of 4 setae on lateral midmargin of genital segment; setae in 2 groups of 2 each. Leg 6 in other species represented by a single seta at posterior corner of genital segment. No seta at this site could be found in the examined specimens of this species, but it could have been broken off.

Egg strings uniseriate.

MALE.—Unknown.

ETYMOLOGY.—The name longicauda refers to length of caudal rami relative to width.