Anchistrotos laqueus Leigh-Sharpe 1935

Anchistrotos laqueus Leigh-Sharpe, 1935

Anchistrotos laqueus Leigh-Sharpe, 1935:266.—Leigh-Sharpe, 1939:1 70.—Rounds, 1960:485.—Yamaguti, 1963:22.—Kabata, 1979:76.

Anchistrotos hamatus Rounds, 1960:485; 1962:247. [New synonymy.]

Anchistrotos hematus Rounds, 1960:485.—Yamaguti, 1963:22. [New synonymy.]

MATERIAL EXAMINED.—From Serranus scriba Linnaeus: 1 female, 2 immature females collected at Livarno, Italy; 1 female from 35°48′N, 05°45′W; 1 female from Bay of Naples. From Serranus cabrilla Linnaeus: 3 females from Haifa Bay, Israel; 4 females off Tunisia (36°57′N, 10°28′E). From Cliata mustela Linnaeus: 1 female from Baltic Sea, south of Elsinore; 1 female from England.

DESCRIPTION.—Female: Body as in Figure 103A. Total length 0.93 mm (0.89–0.95 mm) and greatest width 0.39 mm (0.36–0.41 mm) based on 3 specimens. Cephalothorax 254 × 395 μm (1 × w), indistinctly separated from second pedigerous segment, and comprising about 25% of total body length. Thoracic segments bearing legs 2, 3, and 4 decreasing in width posteriorly. Genital complex wider than long. 87 × 106 μm. Abdomen 4-segmented; segments from anterior to posterior 51 × 76 μm, 46 × 69 μm, 30 × 62 μm, and 44 × 55 μm (1 × w); anal segment (Figure 103B) unornamented. Caudal ramus (Figure 103B) longer than wide. 36 × 21 μm, and bearing 6 setae; innermost and 2 large terminal setae unilaterally barbed. Egg sac (Figure 103C.) with eggs multiserially arranged.

Rostral area (Figure 103D) with circular sclerotized part on ventral surface. First antenna (Figure 103D) 7-segmented; armature formula as follows: 5, 15, 5, 3, 4, 2 + 1 aesthete, and 7 + 1 aesthete. Second antenna (Figure 103E) apparently 4-segmented; first 2 segments each with a distal seta; third segment with 2 pectinate processes (longer one with small distal seta, and shorter one with seta at midlength) and 1 large curved spine; terminal segment with 2 large curved spines and 4 setae. Postantennal process (Figure 103F) a sharp curved process.

Labrum (Figure 103G) somewhat truncate with row of spinules on medial region of posterior margin. Mandible (Figure 104A) with 2 unequal blades, each spinulated along 1 margin. Paragnath (Figure 104B) a lobe bearing a tuft of setules at base. First maxilla (Figure 104C) with 2 rounded knobs and 6 setae (1 large seta and 1 smaller seta each with 2 rows of bristles). Second maxilla (Figure 104D) 2-segmented; first segment a large sclerotized area; second segment with spinulated terminal process and 2 pinnate setae. Maxilliped (Figure 104E) apparently 3-segmented; first segment with usual seta; second segment (corpus) with 2 naked setae; terminal segment a sigmoidal claw bearing rounded denticles and 2 whip-like setae (one fused to base of claw).

Legs 1–4 (Figures 104F, 105A–D) biramous. Spinal and setal formula as follows:

P1 coxa 0-1 basis 1-1 exopod 1-0; 1-1; 7

endopod 0-1; 6

P2 coxa 0-0 basis 1-0 exopod 1-0; 1-1; II, I, 5

endopod 0-1;0-2; II, I, 3

P3 coxa 0-0 basis 1-0 exopod 1-0;1-1; II, I, 5

endopod 0-1; 0-2; II, I, 2

P4 coxa 0-0 basis 1-0 exopod 1-0; 1-1; II, I, 5

endopod 0-1;0-1; IV (or II, int., I)

Interpodal plates of legs 1–4 (Figures 104F, 105A,C) with spinules on posterior margins; that of leg 1 with convex posterior margin. Plates of legs 2 and 3 reentrant; plate of leg 4 with relatively straight posterior margin. Outer seta of basis of leg 1 (Figure 104F) blunt and stout. Coxae of legs 2–4 (see Figure 105A,C) with rows of spinules on distolateral margins and proximal areas near junction with bases. Exopods of legs 2–4 with outer margins of segments with minute spinules; exopod spines of legs 2–4 (see Figure 105A) not highly sclerotized, and bearing minute bristles. Endopods of legs 2–4 (Figure 105A,B,D) with minute spinules on outer margins of segments; second segment of endopods of legs 2 and 3 with outer spiniform processes and long inner spinules. Endopod spines of legs 2 and 3 (see Figure 105A) bilaterally spinulated. Endopod of leg 4 (Figure 105D) with outermost spine having a hyaline membrane; terminal spine bilaterally spinulated; intermediate spine unilaterally spinulated (bristled) and semipinnate; innermost spine naked. Leg 5 (Figure 105E) with 2 segments; first segment w ith ventral row of distal spinules and a sparsely pinnate seta; second segment 72 × 38 μm (1 × w), bearing 3 setae, each with 1 row of bristles, and 1 naked seta (each seta with row of minute spinules at base), and with longer spinules on distomedial corner near base of innermost seta. Leg 6 represented by 3 setae in area of egg sac attachment.

Male: Unknown.

Plymouth, England

Livarno, Italy

Bay of Naples

Haifa Bay, Israel

off Tunisia

Baltic Sea, south of Elsinore

England

off the coast of Turkey