Siolicaris jakobi ( Noodt, 1963a )

Reddy, Ranga & Arbizu, Martínez, 2012, Revision of the genus Siolicaris Jakobi, 1972, with redescriptions of S. sioli (Noodt, 1963) and S. jakobi (Noodt, 1963) from South America, and S. sandhya (Ranga Reddy, 2001) comb. nov. from India (Copepoda, Harpacticoida,, Zootaxa 3493, pp. 49-71 : 55-58

Siolicaris jakobi ( Noodt, 1963a)

( Figs. 3–4)

Synonymy. Parastenocaris jakobi Noodt — Noodt (1963a), Dussart (1984), Dussart & Defaye (1990), Rouch (1986, 1988),

Reid (1998), Ranga Reddy (2001). Parastenocaris jakobii Noodt (incorrect spelling)— Jakobi (1972), Corgosinho et al. (2008). Siolicaris jakobii (Noodt) (incorrect spelling)— Corgosinho et al. (2008). Siolicaris jakobi (Noodt) —Corgosinho et al. (2010). Parastenocaris digitata Noodt , syn. nov. — Noodt (1963a), Jakobi (1972), Löffler (1981), Dussart (1984), Rouch (1986, 1988),

Dussart & Defaye (1990), Reid (1998), Ranga Reddy (2001). Siolicaris digitata (Noodt) , syn. nov. — Jakobi (1972).

Material examined. Parastenocaris jakobi , type (Case 2, slide 16), 1 ♂ dissected and mounted on a single slide; Parastenocaris digitata , syntype (Case 2, slide 19), 2 ♂ dissected and mounted on a single slide (plus an undissected female of Remaneicaris clandestina and a dissected male of P. jakobi ); Parastenocaris jakobi , 1 damaged ♂ sorted from Noodt’s material stored in formalin, dissected and mounted on a single slides with glycerin (added to Noodt’s collection).

Type locality. Coastal groundwater of the Amazon River at Santarém-PA ( Brazil) .

Description. Male. Body size of 350 µm (after Noodt 1963a). Telson smooth, anal operculum smooth and slightly concave ( Fig. 3A and Noodt 1963a: 133, fig. 71). Furca ( Figs. 3A) with 7 setae; setae I–III proximally inserted, anterior to seta VII; seta II reduced; seta IV subdistal, inserting dorsally, on outer margin of furca; seta V inserted 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 inserted dorsally, on inner margin of furca.

A1 ( Fig. 3B–F) haplocer, 8-segmented and prehensile, 7 th segment without a distal inner apophysis; armature beginning with proximal segment: 0/6/4/1(short spine)/5+Ae/2? [1 hyaline spine (dotted structure) and 1 setae?]/2 [1 hyaline spine (dotted structure) and 1 distal seta]/9+Ae; distal segment with distal hyaline margin.

A2 ( Fig. 3G) with allobasis; abexopodal margin with 2 rows of spinules; 1-segmented exp with 1 apical seta, and 1-segmented enp bearing 7 setae.

Md ( Fig. 3H) with a coxal gnathobasis (gnathobasal seta not obeserved) and 1-segmented palp with 2 setae.

Mx1 ( Fig. 3H) praecoxal arthrite with 5 elements (1 dorsal surface seta, 3 claw-like pinnate spines (small ventral seta not observed), coxa with 1 seta, basis with 3 setae.

Mx2 ( Fig. 3I) basis with 2 endites, proximal endite with 1 seta, distal endite with 2 slender setae and a 1 pinnate spine, proximal endopodal segment drawn into claw, distal endopodal segment with 2 setae.

Mxp ( Fig. 3J) subchelate, composed of syncoxa, basis, 1-segmented endopod and 1 claw-like apical seta.

P1 ( Fig. 3K) coxa bare; basis with outer seta and outer row of spinules, 1 inner row of long spinules and 1 row of spinules near the insertion of enp. Exp 3-segmented, exp-1 with outer spine, exp-2 unarmed, exp-3 with 1 outer spine, 1 spine on anterodistal corner, and 2 geniculate apical setae of different lengths; enp 2-segmented, slightly longer than exp, 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 apical outer spine and 1 apical geniculate seta.

P2 ( Fig. 3L) coxa ornamented with row of tiny spinules near distal inner corner; basis without outer seta, with outer pore and row of spinules on outer margin; exp 3-segmented, exp-1 with long outer spine and hyaline frill on distal inner corner; exp-2 without armature and with distal row of long spinules; exp-3 with 3 setae, hyaline frill on distal inner corner and row of long spinules on outer distal corner; enp 1-segmented, somewhat cylindrical, distinctly shorter than exp-1, with 2 spinules distally, 1 outer spinule and 1 distal seta.

P3 ( Fig. 4A, C–F, I) coxa bare; basis rectangular, with a row of strong spinules on outer margin, above the insertion of outer seta and pore; exp complexly built, 2-segmented, represented by exp-1 and apophysis (exp-2, broken in P. digitata ); exp-1 robust, with 2 processes with blunt tip at the distal margin, apophysis strong, drawn out into a claw curved to the outside; thumb strong, longer than apophysis, with distal hyaline membrane and a proximal spur, enp reduced to tiny seta.

P4 ( Fig. 4G–H, J–K) coxa with 3 long spinules on anterior margin; basis trapezoidal, with outer seta and 3 spinules near its insertion; exp 3-segmented, exp-1 with outer spine and spinules on distal inner corner; exp-2 without armature and with distal row of long spinules; exp-3 somewhat bent inwards, with 2 setae and hyaline frill on the distal inner corner; enp greatly reduced, somewhat variable: bud-like with blunt tip and 3 tiny apical spinules ( Fig. 4H, K) or digitiform with distal inner corner produced into setiform structure ( Fig. 4B, G).

P5 ( Fig. 3M) trapezoidal, without inner process, with an inner row of small spinules and 3 setae, all distally inserted; both limbs close to each other. Intercoxal sclerite not observed.

P6 as irregular plate with lateral triangular projections.

Female. Unknown.