Siolicaris sandhya Reddy & Arbizu 2012, comb. nov.

Siolicaris sandhya (Ranga Reddy, 2001) comb. nov.

(Figs. 6 –10)

Synonymy. Parastenocaris sandhya Ranga Reddy — Ranga Reddy (2001), Ranga Reddy & Defaye (2007), Ranga Reddy & Schminke (2008), Ranga Reddy & Defaye (2009).

Material examined. 3 ♂ and 3 ♀♀. Illustrations based on 1 ♂ and 1 ♀ dissected and mounted on 7 slides each.

Type locality. River Krishna at Vijayawada, South India (additional information in Ranga Reddy 2001).

Emended description. Male. Integumental window visible only on cephalothorax (Fig. 6A, B). Furca (Figs. 6A) with 7 setae; setae I–III proximally inserted, anterior to seta VII; seta II reduced; seta IV subdistal, inserting dorsally, on the outer margin of furca; seta V inserting on the distal margin of furca; seta VI shorter than seta V, inserting beneath it; seta VII approximately of the same size as seta VI, socketed at basis and inserting dorsally, on inner margin of furca.

A1 (Fig. 7A–C) haplocer, 8-segmented and prehensile, 7 th segment without a distal inner apophysis; armature beginning with proximal segment: 0/6/4/2 [1 hyaline spine (dotted structure) and 1 seta]/5+Ae/2 [1 hyaline spine (dotted structure) and 1 seta]/2 [1 hyaline spine (dotted structure) and 1 distal seta]/9+Ae.

A2 (Fig. 7D) and Md (Fig. 7E) as described by Ranga Reddy (2001).

Mx1 (Fig. 7F) praecoxal arthrite with 5 elements (1 dorsal surface seta, 3 claw-like pinnate spines and 1 slender seta), coxa with 1 seta, basis with 3 setae.

Mx2 (Fig. 7G) basis with 2 endites, proximal endite with 1 seta, distal endite with 2 slender setae and 1 pinnate spine; proximal endopodal segment drawn into claw; distal endopodal segment with 2 setae.

Mxp (Fig. 7H) subchelate, composed of syncoxa, basis with 1-segmented endopod fused to the claw-like apical seta.

P1 (Fig. 7I) coxa bare, basis with outer seta and outer row of spinules, and row of spinules near the insertion of the enp. Exp 3-segmented, exp-1 with outer spine, exp-2 unarmed, exp-3 with 2 outer spines and 2 geniculate setae of different lengths; enp 2-segmented, slightly bent inwards; enp-1 as long as the combined length of first 2 exopodal segments, with 2 long spinules inserted at inner distal third, enp-2 with 1 outer spine and 1 geniculate seta.

P2 (Fig. 8A–C) coxa bare; basis without outer seta, with outer pore and 1 row of spinules on outer margin; exp 3-segmented, exp-1 with long outer spine and hyaline frill on its distal inner corner; exp-2 without armature, with a distal row of long spinules and 3 superimposed series of long setules on inner margin; exp-3 with 3 setae, hyaline frill on distal inner corner, row of long spinules on outer distal corner and row of long setules proximally inserted on inner margin; enp 1-segmented, shorter than exp-1, obovate, with proximal and medial row of spinules, distally with long seta and large spinule with hyaline margin.

P3 (Fig. 8D–F) coxa naked; basis subquadrate, with row of strong spinules on outer margin, near the insertion of outer seta and pore; apophysis elongate, with distal claw and distal hyaline round tip, 1 large, outer spinule near the insertion of thumb; thumb strong, longer than apophysis, with a broad basis; enp represented by small seta.

P4 (Fig. 8G) coxa naked; basis with outer seta, pore, row of small spinules near the outer margin and row of small spinules near the insertion of enp; exp 3-segmented, exp-1 with outer spine and hyaline frill on distal inner corner; exp-2 without armature and with distal row of long spinules; exp-3 with 2 setae and hyaline frill on distal inner corner; enp much reduced in size, 1-segmented, digitiform, bare.

P5 (Fig. 9A–C) trapezoidal, with slender inner process, connected by a small, triangular intercoxal plate. With a row of small spinules on inner margin and 4 setae, all distally inserted; proximal exopodal seta, adjacent to the outer basal seta tiny and inserted on a small protuberance.

P6 (Fig. 9A–B) as described by Ranga Reddy (2001).

Female. Sexually dimorphic in A1, P2–P5 and genital somite. Integumental window visible only on the cephalothorax (Fig. 6B). Furca (Fig. 6B, C, E) armature as in male; variation in furcal shape as described by Ranga Reddy (2001). Telson with ventral row of spinules near the insertion of each furcal ramus (Fig. 6D).

FIGURE 10. Siolicaris sandhya (Ranga Reddy, 2001) comb. nov., female. A, A1; B, A1 segment V; C, A2; D, P1; E, P2; F, enp P2; G, inner seta exp-3 P2; H, P3; I, J, P4 basis with enp and partially drawn exp-1. Scale bar = 20 µm.

A1 7-segmented (Fig. 10A), not geniculate; armature beginning with proximal segment as follows: 0/4/4/ 1+Ae/2/1/9+Ae.

P2 (Fig. 10E–F) inner margin of exp-2–3 without the series of long setules present in males. Enp claviform, with distal row of spinules and distal seta.

P3 (Fig. 10H) coxa bare. Basis with a long outer seta and inner row of spinules approximately where enp inserts in other species. Enp completely absent. Exp 2-segmented, exp-1 with outer spine and distally, with outer and inner row of small spinules; exp-2 with 2 distal setae, outer row of spinules and usual hyaline frill at distal inner corner.

P4 (Fig. 10I) coxa, basis and exp as in the male, with minor differences in ornamentation; enp reduced in size, smaller than exp-1, 1-segmented, digitiform, bare.

P5 (Fig. 9D) trapezoidal, with moderately pronounced inner process, 1 inner spinule and 3 setae, all distally inserted. Intercoxal sclerite not observed.

P6 (Fig. 9D) formed by 2 lateral and unarmed plates covering the gonopore. Single medially located copulatory pore.