Cosmolaelaps latisetis Joharchi 2022, sp. nov.

Cosmolaelaps latisetis Joharchi sp. nov.

(Figures 25–44)

Type material. Holotype, female, on the coast of the Sea of Japan (East Sea), Sakhalin Island, Russia, 46°42'49.5"N 141°53'14"E, 11 August 2021, O. Joharchi coll., in the nest of Lasius flavus (Fabricius, 1782) (Hymenoptera: Formicidae) (in TUMZ). Paratypes: two females, same data as holotype (in TUMZ).

Diagnosis (adult female). Dorsal shield well reticulate, with 39 pairs of scimitar-like setae, reaching well past base of next posterior setae, Z5 shorter than J5 (ratio of J5/Z5 ≈ 1.5); presternal area poorly sclerotised, sternal shield with lineate-reticulate ornamentation on lateral surface, bearing three pairs of long setae, extending slightly beyond of next posterior setae, ratio of shield length/width (at broadest level) ≃ 0.65; genital shield ratio of length/ width (at broadest level) ≃ 1.9, shield ornamented posteromedially by seven cells flanked by a median Λ-shaped ornamentation, anal shield ratio of length/width (at broadest level) ≃ 1.2, post-anal seta thickened, sparsely barbed, apically bent (hook shaped); distance between genital and anal shields is shorter than length of anal shield, almost all opisthogastric setae well thickened (especially Jv5, apically bent) and arising on minute sclerotised platelet, except Jv1–2 and Zv1. Fixed digit of chelicera with five teeth, including two large proximal teeth (posterior to pilus dentilis). Legs without spatulate setae but most setae conspicuously thickened and some inserted on small tubercles. Legs I and IV shorter than length of idiosoma.

Description. Female (n=3)

Dorsal idiosoma (Figs 25, 30, 32, 33). Dorsal shield semi-circular, large, reticulate throughout, 498–512 long, 404–410 wide, covering entire dorsal idiosoma. Shield with 39 pairs of very long scimitar-like setae, 22 podonotal, 17 opisthonotal, including two pairs of Zx setae between J and Z setae, and three unpaired setae Jx between J2 and J4, setae reaching well past base of next posterior setae, mostly subequal in length (60–73), all dorsal setae very thick and slightly swollen at base, except j1 (20–23) and z1 (17–20) simple and shortest, ratio of J5 (37–40)/Z5 (22–25) ≈ 1.5, Z5 sparsely barbed (Figs 25, 30, 32, 33). Dorsal shield with 23 pairs of pore-like structures, including seven pairs of gland openings (gd1, gd2, gd4, gd5, gd6, gd8, gd9) and 16 pairs of poroids. Shape, position and relative length and shape of setae shown in Figures 25 and 30.

Ventral idiosoma (Figs 26, 31, 34, 40). Tritosternum with paired pilose laciniae (77–80), fused basally (6–8), columnar base 27–29 × 15–17 wide; presternal area poorly sclerotised. Sternal shield (length 90–95) narrowest between coxae II (94–97), widest (143–147), anterior margin of shield hardly conspicuous, posterior margin distinctly concave, anterolateral corners narrowly slightly extending between coxae I–II, gland pores gvb indistinct; endopodal elements between coxae II and III fused with shield and endopodal elements III/IV relatively small, subtriangular, posteriorly not extended. Sternal shield with three pairs of subequal smooth setae (st1-3) (42–46) and two pairs of large slit-shaped pore-like structures (iv1 adjacent to setae st1; iv2 between st2 and st3), setae extending slightly beyond base of following setae; shield with lineate-reticulate ornamentation on lateral surface, longitudinally median part smooth (or faintly reticulated) (Figs 26, 31). Metasternal setae st4 (42–44) and metasternal poroids located on soft integument; metasternal platelets absent. Genital shield flask-shaped, slightly expanded laterally past level of setae st5, length 208–212, maximum width 108–111, posterior margin rounded, anterior hyaline margin of shield irregularly convex, overlapping posterior area of sternal shield (extending beyond base of setae st3), surface ornamented posteromedially by seven cells flanked by a median Λ-shaped ornamentation; bearing a pair of simple setae st5 (38–40) (Figs 26, 31, 34). Shield flanked by two pairs of minute, oval paragenital platelets; paragenital poroids iv5 located on soft cuticle lateral to shield near seta st5. Anal shield subtriangular, rounded anteriorly, length 91–95, width 75–78, anterior half faintly lineate-reticulate, bearing a pair of simple para-anal setae (23–26), postanal seta (30–32) thickened, sparsely barbed, apically bent (hook shaped) (see Figs 26, 31, 34, 40) and with a pair of marginal pores (gv3); cribrum consisting of a terminal tuft with 3–4 irregular rows of spicules, anteriormost rows of spicules extending slightly beyond post-anal seta (Figs 26, 31, 34, 40). Soft opisthogastric cuticle surrounding genital and anal shields with seven pairs of poroids, including one pair of paragenital poroids iv5, ivp and five pairs of ivo, inguinal gland pores gv2 on soft cuticle close to parapodals and one pair of suboval metapodal plates (13–16 long × 8–10 wide) present, soft cuticle with two minute paragenital platelets between metapodals and genital shield, bearing 16 pairs of thick setae (Jv1–Jv5, Zv1– Zv 5, R1–R4, UR2–UR3); almost all setae uniform in length (20–30), and arising on small sclerotised platelet, except Jv1–2 (33–35) and Zv1 (38–40) longer and setiform (Figs 26, 31, 34). Peritrematal shield well developed laterad peritremes, bearing one gland pore and one poroid at level near coxae II–III, post-stigmatic extension of shield relatively wide, not reaching posterior level of coxae IV, with two pairs of poroids and one pair of gland pores; anterior region of peritrematal shield fused to anterior margin of dorsal shield behind setae z1. Peritremes long, extending to mid-level of coxa I (near id1). Two exopodal platelets between coxae II–III and III–IV present, anterior platelet small and subtriangular, those between coxae III–IV linear, narrow, more or less abutting to parapodal more or less abutting to parapodals.

Gnathosoma (Figures 27–29, 35, 36, 39). Anterior margin of epistome convex, irregularly denticulate, with smooth median spike, lineate posteriorly (Fig. 28). Hypostomal groove with six transverse rows of denticles, each row with 6–16 small denticles, except anteriormost row widest, slightly convex, with 28–30 small denticles, groove with smooth posterior transverse line and progressively narrowing from anterior to posterior (Figs 27, 36). Corniculi horn-like, internal malae longer than corniculi, comprising a pair of pilose median projections, and 10–12 lateral, shorter, tentacle-like, smooth projections (Fig. 27); labrum acuminate, longer than internal malae, fringed; hypostomal and capitular setae smooth, h3 (48–51)> h1 (36–39)> pc (28–30)> h2 (17–20) (Figs 27, 36). Chaetotaxy of palps: trochanter 2, femur 5, genu 6, tibia 14, tarsus 15, all setae smooth except palpfemur with seta d3 thickened and inserted on small tubercles, seta al thickened; palpgenu with al1 stout, al2 paddle-like; palp tarsal claw two-tined (Fig. 35). Supralabral process indistinct. Fixed digit of chelicera with an offset and subapical tooth (gabelzhan), followed by four teeth, including two large proximal teeth posterior to a setaceous pilus dentilis, dorsal cheliceral seta prostrate, arthrodial membrane with a rounded flap and normal filaments; cheliceral lyrifissures distinct, movable digit of chelicera bidentate (Figs 29, 39).

Insemination structures. Not seen, apparently unsclerotised.

Legs (Figs 41–44). Legs II and III short (352–356, 343–348), I and IV longer (465–470) (excluding pre-tarsus). Chaetotaxy normal for free-living Laelapidae (sensu Evans, 1963a): Leg I (Fig. 41): coxa 0-0/1, 0/1-0, trochanter 1-1/1, 0/2-1 (al and ad thickened and inserted on small tubercles), femur 2-3/1, 2/3-2 (all setae on segment thickened except al2, av, pl1, pl2, ad2 and al1, ad1, ad3 inserted on small tubercles, see Figures 37, 38), genu 2-3/2, 3/1-2 (all setae on segment thickened and dorsals inserted on small tubercles, see Figures 37& 38), tibia 2-3/2, 3/1-2 (all setae on segment thickened and dorsals inserted on small tubercles, see Figures 37, 38). Leg II (Fig. 42): coxa 0-0/1, 0/1-0, trochanter 1-0/1, 0/2-1 (al thickened), femur 2-3/1, 2/2-1 (all setae on segment thickened except al2, and ad1, pd1, pd2 inserted on small tubercles, pd2 longest), genu 2-3/1, 2/1-2 (dorsals and ventrals thickened and dorsals inserted on small tubercles), tibia 2-2/1, 2/1-2 (all setae on segment thickened except anterolaterals). Leg III (Fig. 43): coxa 0-0/1, 0/1-0, trochanter 1-1/1, 0/2-0 (al and ad thickened and inserted on small tubercles), femur 1-2/1, 1/0-1 (dorsals and anterolateral thickened, ad1 and ad2 inserted on small tubercle), genu 2-2/1, 2/1-1 (all setae on segment thickened), tibia: 2-1/1, 2/1-1 (all setae on segment thickened). Leg IV (Fig. 44): coxa 0-0/1, 0/0-0, trochanter 1-1/1, 0/2-0 (al and ad thickened and inserted on small tubercles), femur 1-2/1, 1/0-1 (ad1, ad2 thickened and inserted on small tubercles), genu 2-2/1, 3/0-1 (all setae on segment slightly thickened), tibia 2-1/1, 3/1-2 (all setae on segment slightly thickened). Tarsi II–IV with 18 setae (3- 3/2, 3/2-3 + mv, md); almost all setae on tarsus II–IV thickened, see Figures 42–44. All pretarsi with well-developed paired claws, rounded pulvilli and normal ambulacral stalk.

Male. Unknown.

Etymology. The specific name latisetis, from the Latin " lati -" meaning broad, thick and " setis " meaning hair, refers to the broad dorsal setae.