Ideobisium kichwa, Mau & Harvey & Harms, 2022

Mau, Sofía Amieva, Harvey, Mark S. & Harms, Danilo, 2022, New syarinid pseudoscorpions from Ecuador (Pseudoscorpiones, Syarinidae: Ideobisium and Ideoblothrus), European Journal of Taxonomy 821 (1), pp. 102-149 : 106-113

Ideobisium kichwa sp. nov.

urn:lsid:zoobank.org:act:52558090-54CC-4788-81CF-A4ECAC101421

Figs 3–8

Diagnosis

Ideobisium kichwa sp. nov. differs from I. crassimanum by the length of the chela (without pedicel) (♀ I. crassimanum 0.93 mm, ♀ I. kichwa sp. nov. 0.80–0.85 mm). It differs from I. ecuadorense in dimensions of the palpal femur (♂ I. kichwa sp. nov. 2.56–2.59, ♂ I. ecuadorense 2.89 times as long as broad), and in the number of teeth on the cheliceral fiXed finger (♂ I. kichwa sp. nov. fiXed finger 5, movable finger with 6–8, ♂ I. ecuadorense with 14–15 and 11–12, respectively). It differs from I. peckorum Muchmore, 1982 in the dimensions of the chelal hand (♂ I. kichwa sp. nov. chelal hand 1.26–1.29, ♂ I. peckorum 1.44–1.55 times as long as broad) and a longer movable chelal finger (♂ I. kichwa sp. nov. 0.95–1.00, ♂ I. peckorum 0.81–0.87 times as long as hand). It differs from I. schusteri Mahnert, 1985 from Brazil in the carapace size (♂ I. kichwa sp. nov. length/width 0.39– 0.42/ 0.31–0.34 mm, ♂ I. schusteri 0.49–0.59/ 0.43–0.57 mm). It differs from I. susanae sp. nov. in the position of trichobothrium esb, which is midway between e b and isb in I. susanae sp. nov. and closer to eb than isb in I. ecuadorense , I. sonqo sp. nov. and I. kichwa sp. nov.

Etymology

This species is named in honour of the Kichwa indigenous people of Ecuador. The name is to be treated as a noun in apposition.

Material examined

Holotype ECUADOR • ♀; Napo Province, Tena, Colonso Chalupas Natural Reserve ; 00°54ʹ32.904ʺ S, 77°53ʹ9.168ʺ W; alt. 1048 m; 9–15 Mar. 2020; pitfall traps; N. Dupérré, E.E. Tapia and A.A. Tapia leg.; QCAZ.

Allotype ECUADOR • ♂; same collection data as for holotype; QCAZ.

Paratypes ECUADOR • 1 ♂; same collection data as for holotype; ZMH A0003685 • 2 ♀♀; same collection data as for holotype; ZMH A0003686 , ZMH A0003687 .

Description

Female, adult (holotype; Fig. 3A–C )

COLOUR. Prosoma and pedipalps dark brown, opisthosoma light brown, femora and patella of pedipalps with a pattern of light brown circles. Body length 1.90 mm.

PEDIPALP ( Figs 5E–F , 8A–C ). Setae on prolateral margin long and acicular; trochanter 1.50, femur 2.53, patella 1.82, chela (with pedicel) 2.42, chela (without pedicel) 2.22, hand 1.25 and movable finger 4.10 times as long as broad. Patella with one lyrifissure situated dorsally near pedicel. Chela scarcely granulated at base; fiXed chelal finger with 8 trichobothria, movable finger with 4 trichobothria: eb situated near base of chela, esb situated medially on retrolateral face of hand, isb next to base of finger, distance between isb and est greater than between est and et, et situated near tip of fiXed finger, est situated between et and isb; trichobothrium b situated basally on movable finger, sb, st and t situated medially, close to each other; trichobothrium t short and lanceolate. Venom apparatus present only in fiXed finger, venom duct short. All teeth rounded and juXtadentate, 28 teeth on fiXed finger, 38 on movable finger.

CEPHALOTHORAX ( Figs 5A–B , 7C–D ). Carapace 1.24 times as long as broad, rectangular in shape; 2 corneate eyes on each side, anterior eyes prominent and with a lens, posterior eyes reduced to a dark cuticular patch; epistome rounded; 24 setae arranged 4:4:4:6:6, without furrows; four small lyrifissures, one behind each eye and two near posterior margin, one on each side; chaetotaXy of leg coxae I–IV: 8:8:8:8; pedipalpal coxa with 8 setae and 2 apical setae. Posterior section of coxae II slightly overlapping anterior section of coxae III.

CHELICERA ( Figs 5C–D , 7E–G ). Smooth; 1 dorsal lyrifissure between ls and is; 5 setae on hand, 1 seta on movable finger, setae is, ls, and sbs longer than bs and eb, gs situated subdistally on movable finger; fiXed finger with 5, movable finger with 10 distinct teeth; rallum with 7 dentate blades; serrula eXterior with 25 blades; serrula interior with 9 blades; galea long and slightly curved, eXtending past tip of finger, without rami.

ABDOMEN ( Fig. 6A–C ). Tergites and sternites undivided, tergal chaetotaxy 6:6:7:8:8:8:8:7:7:6:6:2; sternal chaetotaxy 10:10:7:9:8:8:8:8:6:4:2; pleural membrane granulate anteriorly near cephalothorax, granulo-striate posteriorly; without setae.

GENITALIA ( Fig. 8E ). Setae arranged linearly in two rows 2:6 on sternite 2 and 8 setae arranged linearly on sternite 3 below opening.

LEGS ( Fig. 7A–B ). All legs with tarsus longer than metatarsus; scarcely granulate; femur + patella of leg IV 2.47 times as long as broad; legs III and IV with articulation between femur and patella segments slightly oblique; tibiae III and IV and metatarsi III and IV with tactile setae; tarsi of legs III and IV with tactile setae sub-basally; arolium shorter than claws, distally broadened and undivided; claws simple and not serrate.

Male, adult (allotype; Fig. 4A–C )

Same as holotype, except body length 1.84 mm.

PEDIPALP. Same as in holotype except trochanter 1.79, femur 2.59, patella 1.71, chela (with pedicel) 2.61, chela (without pedicel) 2.39, hand 1.29 and movable finger 4.44 times as long as broad; 39 distinct teeth on movable finger.

CEPHALOTHORAX. Same as in holotype except carapace 1.27 times as long as broad; chaetotaxy of leg coXae I–IV: 8:8:7:8.

CHELICERA. Movable finger with 8 distinct teeth.

ABDOMEN. Tergal chaetotaXy 6:6:6:7:8:8:8:8:7:7:6:2; sternal chaetotaXy 10:9:10:9:7:7:8:6:4:2.

GENITALIA ( Fig. 8D ). Setae arranged linearly around small rounded ejaculatory opening; 2:4 setae above and 2:2:8 setae arranged linearly under ejaculatory opening.

Variation of female paratypes, adults (n= 2)

Same as holotype except body length 2.08–2.25 mm.

PEDIPALP. Trochanter 1.50–1.69, femur 2.53–2.72, patella 1.88–2.05, chela (with pedicel) 2.33–2.54, chela (without pedicel) 2.15–2.30, hand 1.15–1.24 and movable finger 4.00–4.20 times as long as broad; 30 juXtadentate teeth on fiXed finger.

CEPHALOTHORAX. Same as in holotype except carapace 1.17 times as long as broad. Chelicera. Same as in holotype eXcept movable finger with 7 distinct teeth (n=1).

Variation of male paratype, adult (n =1)

Same as allotype, except body length 1.43 mm.

PEDIPALP. Same as in allotype, except trochanter 1.71, femur 2.56, patella 1.85, chela (with pedicel) 2.77, chela (without pedicel) 2.53, hand 1.26 and movable finger 4.63 times as long as broad; 31 juXtadentate teeth on fiXed finger, 36 on movable finger.

CEPHALOTHORAX. Carapace 1.32 times as long as broad; chaetotaXy of leg coXae I–IV: 7:8:7:8.

CHELICERA. Movable finger with 6 distinct teeth.

ABDOMEN. Tergal chaetotaXy 6:6:6:6:8:7:8:8:7:7:6:2; sternal chaetotaXy 10:8:7:8:7:8:8:6:4:2.

GENITALIA. Same as in allotype, eXcept setae arranged 2:5:2:2:8.

Female dimensions (mm, length/width of holotype followed by range of paratypes in parentheses) Body length 1.90 mm (2.08–2.25 mm). Pedipalps: trochanter 0.24/0.16 (0.24–0.25/0.16–0.18), femur 0.43/0.17 (0.48–0.49/0.18–0.19), patella 0.40/0.22 (0.45/0.22–0.24), chela (without pedicel) 0.80/0.36 (0.84–0.85/0.37–0.39), chela (with pedicel) 0.87/0.36 (0.91–0.94/0.37–0.39), hand length 0.45 (0.46– 0.47), movable finger length 0.41 (0.40–0.42). Chelicera 0.35/0.17 (0.36–0.37/0.18), movable finger length 0.26 (0.26). Carapace 0.62/0.50 (0.61–0.62/0.52–0.53). Leg I: femur 0.18/0.07 (0.18–0.21/0.07), patella 0.19/0.08 (0.21–0.23/0.07–0.08), tibia 0.22/0.05 (0.24–0.25/0.05–0.06), metatarsus 0.10/0.04 (0.10–0.11/0.06), tarsus 0.19/0.04 (0.19–0.22/0.04–0.05). Leg IV: femur 0.20/0.19 (0.21–0.22/0.19), patella 0.27/0.19 (0.28–0.30/0.19), tibia 0.37/0.09 (0.39–0.40/0.09), metatarsus 0.12/0.06 (0.12– 0.14/0.06–0.07), tarsus 0.23/0.06 (0.26/0.07).

Male dimensions (mm, length/width of allotype followed by paratype in parentheses)

Body length 1.84 mm (1.43 mm). Pedipalps: trochanter 0.25/0.14 (0.24/0.14), femur 0.44/0.17 (0.39/0.16), patella 0.36/0.21 (0.37/0.20), chela (without pedicel) 0.74/0.31 (0.76/0.30), chela (with pedicel) 0.81/0.31 (0.83/0.30), hand length 0.40 (0.39), movable finger length 0.40 (0.37). Chelicera 0.31/0.15 (0.31/0.15), movable finger length 0.24 (0.22). Carapace 0.56/0.44 (0.51/0.41). Leg I: femur 0.17/0.07 (0.17/0.06), patella 0.16/0.06 (0.17/0.06), tibia 0.22/0.05 (0.22/0.05), metatarsus 0.10/0.05 (0.09/0.05), tarsus 0.18/0.04 (0.18/0.04). Leg IV: femur 0.19/0.17 (0.21/0.16), patella 0.26/0.17 (0.26/0.16), tibia 0.32/0.09 (0.33/0.10), metatarsus 0.10/0.07 (0.10/0.06), tarsus 0.23/0.06 (0.21/0.05).

Figures

Fig. 3. Ideobisium kichwa sp. nov., holotype, ♀ (QCAZ). A. Habitus in dorsal view. B. Habitus in ventral view. C. Habitus in lateral view. Scale bars = 1 mm.

Fig. 4. Ideobisium kichwa sp. nov., allotype, ♂ (QCAZ). A. Habitus in dorsal view. B. Habitus in ventral view. C. Habitus in lateral view. Scale bars = 1 mm.

Fig. 5. Scanning electron micrographs of Ideobisium kichwa sp. nov., paratypes. A. Carapace with asterisks next to setae. B. Coxa. C. Rallum. D. Chelicera in ventral view with traced galea. E. Chela in retrolateral view showing trichobothria. F. Close-up view of E showing lanceolate trichobothrium t (arrow). A–B: ♂ (ZMH A0003685); C–D: ♀ (ZMH A0003687); E–F: ♂ (ZMH A0003685).

Fig. 6. Scanning electron micrographs of Ideobisium kichwa sp. nov., ♀, paratype (ZMH A0003686). A. Pleural membrane. B. Close-up of the anterior pleural membrane, showing a granulate structure becoming granulo-striate posteriorly; granulate structure indicated with an arrow. C. Close-up of the posterior pleural membrane, showing a granulo-striate structure (arrow).

Fig. 7. Ideobisium kichwa sp. nov., ♀♀. A. Leg I. B. Leg IV. C. Coxa. D. Carapace. E. Serrula exterior. F. Chelicera in dorsal view, showing trichobothria and galea. G. Rallum. A–F: holotype (QCAZ); G: paratype (ZMH A0003687). Abbreviations: Fe = femur; Me = metatarsus; Pa = patella; Ta = tarsus; Ti = tibia. Scale bars: A–C, F = 0.25 mm; D = 0.50 mm; E = 50 µm; G = 30 μm.

Fig. 8.Ideobisium kichwa sp. nov. A. Chela in dorsal view, showing trichobothria.B. Chela in retrolateral view, showing lanceolate trichobothrium t. C. Chela in ventral view. D. Outer genital area, showing setal arrangement. E. Genital area, showing setal arrangement. A–C, E: holotype, ♀ (QCAZ); D: allotype, ♂ (QCAZ). Scale bars: A–C = 25 µm; D–E = 50 μm.