Temnalges atelodiscus Hernandes & Mironov, 2015, sp. nov.

Temnalges atelodiscus sp. nov.

(Figs. 14–17)

Type material. Male holotype (DZUNESP-RC #3141), 1 male and 1 female paratypes from Opisthocomus hoazin (Müller, 1776) (Opisthocomiformes: Opisthocomidae), BRAZIL, Pará State, Fazenda Fartura, 09°40'S / 50°23'W, Santana do Araguaia, 0 8 September 2013, D.V. Boas-Filho coll. (#1112); other paratypes: 1 male and 1 female, same host, BRAZIL, Rondônia State, Machadinho d’Oeste 08°56′48′′S / 61°59′54′′W, 0 8 October 2014 (#MC153), F. Schunck & V.Q. Piacentini colls.

Depository. Holotype, 2 male and 2 female paratypes at DZUNESP-RC.

Description. MALE (Figs. 14–15). (holotype, range for 2 paratypes in parentheses). Length of idiosoma 259 (244–256), width 175 (167–183). Prodorsal shield: length 91 (86–87), width at posterior margin 51 (46); lateral margins with incisions at level of setae si. Setae vi absent. Scapular setae si slightly anterior to se. Setae se separated by 47 (43–46). Length of hysterosoma 168 (154–163). Hysteronotal shield: length from anterior margin to level of setae h3 152 (147–153), width at anterior margin 71 (61–62); anterior margin straight with rounded margins; lateral margins straight. Setae d1 absent, setae e1 equidistant from hysteronotal gland openings gl and bases of setae e2. Supranal concavity poorly distinct. Opisthosomal lobes poorly developed, body terminus almost rounded (Fig. 14 A). Distances between idiosomal setae: d2: d2 66 (61–64), e2: e2 58 (54–59), d2: e2 64 (55–59), h3: h3 47 (45), ps1: ps1 26 (25).

Epimerites I free with diverging tips, without sclerotized areas, shortest distance between arms 3 (4–5). Epimerites II connected to epimerites III. Coxal fields I, III, IV open, II closed. Epimerites IV with pointed sclerotized areas flanking base of trochanters IV, bearing setae 4a. Genital apparatus situated at anterior level of trochanters III, 17 (18–19) long and 19 (18–19) wide at base; aedeagus minute (Fig. 15 G). Paragenital and adanal apodemes absent. Setae 4b anterior to level of genital apparatus, setae g slightly posterior to this level. Diameter of anal suckers 12 (11). Distance between ventral setae: 4b: 4b 32 (28–31), 4b: g 29 (25–30), g: ps3 40 (44–45).

Tibiae I and II with pair of well-developed acute ventral spines (Fig. 15 A, B). Tibia III with short paraxial spur. Tarsi I, II terminating in pointed claw, tarsus II with large, rounded apophysis among bases of setae ra, wa, s, tarsus IV with a pair of spurs apically, ambulacra IV absent. Length of tarsi: I 38 (38–39), II 42 (41–42), III 55 (61–64) (Fig. 15 G). Setae kT of tibia III and d of tarsus III strong and extremely elongated. Setae d, e of tarsus IV barrelshaped with cap, situated ventrally (Fig. 15 F). Length of solenidia: σ 1 I 65 (63–67), σ II 9 (9–13), σ III 66 (59–82), φ I 77 (55–72), φ II 105 (82–96), φ III 80 (79–84), φ IV 30 (30–32), ω 1 I 27 (26), ω 3 I 49 (49), ω 1 II 51 (48–50).

FEMALE (Figs. 16–17) (range for 2 paratypes). Length of idiosoma 273–277, width at level of humeral shields 168–176. Prodorsal shield: lateral margins without incisions at level of setae si, posterior margin rounded; length 106–107, width 53–57; setae vi absent; setae se separated by 49–53. Length of hysterosoma 161–164. Hysteronotal shield roughly rectangular in shape; lateral and posterior margins slightly sinuous; greatest length 103–107, greatest width at anterior half 68–71 (Fig. 16 A). Setae d1 absent; setae d2 on anterior angles of this shield; gland openings gl situated off hysteronotal shield. Distance between dorsal setae: c2: d 2 27–27, d2: e2 73 – 74, d2: d2 59–61, e2: e2 63 –68.

Epimerites I free with diverging tips, without sclerotized areas (Fig. 16 B). Coxal fields I-IV open. Epigynum semi-circular, 39 long, 55–62 wide with short median acute extension on inner margin. Setae g on posterior tips of epigynum. Copulatory opening ventral, posterior to anal opening. Setae ps1, ps2, f2, h3 minute, filiform about 10 long.

Legs I and II as in male. Setae d of tarsi III extremely strong and elongated, setae e, f of tarsus III lanceolate, remaining setae filiform (Fig. 17 A, B). Tarsus IV short cylindrical, without ambulacrum, seta d modified into thick and long macroseta more than two times as long as the body (Fig. 17 C, D). Length of tarsi: I 35 –38, II 38 –43, III 55 –55. Length of solenidia: σ 1 I 61–63, σ II 8–9, σ III 31–40, φ I 74 –81, φ II 102–111, φ III 64 –74, φ IV 46 –47, ω 1 I 26–29, ω 3 I 42–43, ω 1 II 41–42.

Differential diagnosis. The new species, Temnalges atelodiscus sp. n., is closest to T. hoatzin, described above, in having the ambulacral discs of tarsi I, II deeply incised on the distal margin, and by the absence of the adanal apodemes and epiandrum in males.

Temnalges atelodiscus differs from T. hoazin in having the following features: in both sexes, tarsus II has a large semi-rounded ventral extension, femur II has a large and rounded lateral apophysis (Fig. 15 C), and pretarsus on tarsi IV is absent; in males, the paraxial dorsal spur on tibia III is strongly developed (nearly half as long as tibia), pretarsus of tarsus III is strongly reduced, epimerites II and III on each side of the body are connected, setae 1a and 3a extend beyond the posterior margin of opisthosoma; in females, scapular setae se, si are situated on lateral margins of the prodorsal shield, setae d2 and e2 are approximately as long as the hysteronotal shield, the epigynum extends to bases of setae g, legs IV are half as long as legs III, seta d of tarsus IV is modified into a macroseta more than two times as long as the body. In both sexes of T. hoazin, the ventral extension of tarsus II is spine-like, and femur II lacks the lateral apophysis (Fig. 13 B), pretarsus IV is present; in males, the paraxial dorsal spur on tibia III is much shorter than the corresponding tarsus, pretarsus of tarsus III is normally developed (as on tarsi I, II), epimerites II and III on each side of the body are not connected, setae 1a and 3a are short filiform; in females, scapular setae se, si are situated off the prodorsal shield, setae d2 and e2 are very short (about 10 µm), the epigynum does not extend to bases of setae g, legs IV are slightly longer than legs III, seta d of tarsus IV is normally developed, as on tarsus III.

Etymology. Contraction of a - (Gr., without), telos (Gr., far off, distant) and discos (Gr., disc); this epithet indicates the absence of ambulacral disc on the posterior pair of legs.