Ideoblothrus nadineae, 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 : 127-133

Ideoblothrus nadineae sp. nov.

urn:lsid:zoobank.org:act:AB219A7E-8F0A-4834-B3EF-41B4DF23FBED

Figs 19–24

Diagnosis

Ideoblothrus nadineae sp. nov. differs from I. brasiliensis ( Mahnert, 1979) , I. caecus ( Mahnert, 1979) , I. colombiae Muchmore, 1982 and I. kochalkai Muchmore, 1982 in carapace dimensions (♂ I. nadineae sp. nov. carapace 0.37–0.42 mm long, ♂ 1.16–1.29, ♀ 1.19 times as long as broad, ♂ I. brasiliensis 1.38, ♀ I. caecus 1.27 times as long as broad, ♂ I. colombiae 0.55 mm long, ♂ I. kochalkai 0.74 mm long. It differs from I. costaricensis in pedipalpal dimensions (♂ I. nadineae sp. nov. trochanter 0.16–0.18 mm long, I. costaricensis 0.22 mm long). It differs from I. fenestratus (Beier, 1955) in the absence of a deep furrow on the carapace. Ideoblothrus nadinae sp. nov. differs from I. amazonicus ( Mahnert, 1979) , I. costaricensis , I. levipalpus Mahnert, 1985 , I. paraensis Mahnert, 1985 and I. tenuis Mahnert, 1985 in the dimensions of the chela and carapace, with I. nadineae sp. nov. having smaller dimensions (♂ I. nadineae sp. nov. chela 2.55 2.95, ♀ 2.71 times as long as broad, carapace 0.37–0.42/ 0.31–0.34 mm, chela with pedicel 0.56–0.61 mm and 0.61 mm without pedicel, I. amazonicus carapace 0.35–0.37/ 0.28–0.36 mm and chela length 0.49–0.54 mm, I. costaricensis chela 2.5 times as long as broad, ♀ I. levipalpus chela with pedicel 0.49 mm, ♂ I. paraensis chela length 0.58–0.66 mm, ♀ I. tenuis chela without pedicel 0.74–0.75 mm). It differs from I. safinai sp. nov. in the positions of trichobothria eb, esb and isb, which are closer to each other in I. safinai sp. nov. compared to I. nadineae sp. nov.

Etymology

This specific epithet is a patronym for Nadine Dupérré, collection manager at the ZMH, who collected this new species and mentored the senior author during her studies.

Material examined

Holotype ECUADOR • ♂; Napo Province, Tena, Colonso Chalupas Natural Reserve ; 00°54ʹ33.084ʺ S, 77°53ʹ9.131ʺ W; alt. 1044 m; 14 Mar. 2020; N. Dupérré, E.E. Tapia and A.A. Tapia leg.; sifting litter and Berlese traps; QCAZ.

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

Paratypes ECUADOR • 5 ♂♂; same collection data as for holotype; ZMH A0003695 to A0003699 .

Description

Male, adult (holotype; Fig. 19A–C )

COLOUR. Prosoma and pedipalps reddish-brown, opisthosoma pale brown, femora and patella of pedipalps with a pattern of light brown circles. Body length 1.14 mm.

PEDIPALP ( Figs 21B , 22A , 24A–C ). Setae on prolateral margin long and acicular; trochanter 1.64, femur 2.69, patella 2.00, chela (with pedicel) 2.81, chela (without pedicel) 2.57, hand 1.24 and movable finger 5.33 times as long as broad. Chela granulate, fiXed chelal finger with 8 trichobothria, movable finger with 4 trichobothria: eb situated near base of movable finger chela, esb situated slightly above and close to eb on retrolateral face of hand, isb also near base of finger and slightly above esb, eb, esb and isb very close to each other, est situated medially on fiXed finger, et situated near tip of fiXed finger, distance between isb and est similar to distance between est and et, 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 lanceolate. Venom apparatus present only in fiXed finger, venom duct short; all teeth rounded and juXtadentate, 29 teeth on fiXed finger, 37 on movable finger.

CEPHALOTHORAX ( Figs 21A, C , 23C–D ). Carapace 1.25 times as long as broad, rectangular in shape, no eyes, epistome small and triangular; 26 setae arranged 4:6:4:6:6; without furrows; three pairs of lyrifissures, first pair placed near anterior margin, second pair placed sub-medially, third pair near posterior margin; chaetotaXy of leg coXae I–IV 10:10:8:10, pedipalpal coXa with 10 setae and 2 apical setae. Posterior margin of coxae II slightly overlapping anterior section of coxae III.

CHELICERA ( Figs 22B , 23E–G ). Smooth; 2 dorsal lyrifissures, 1 between ls and is and 1 basally; 5 setae on hand, 1 on movable finger, setae is, ls and sbs longer than bs and eb, gs situated subdistally on movable finger; fiXed finger with 11, movable finger with 6 teeth, rallum with 7 dentate blades; serrula exterior with 25 blades, serrula interior with 11 blades, galea rather short, not extending past tip of movable finger, straight, without rami.

ABDOMEN. Tergites and sternites undivided; tergal chaetotaXy: 7:7:9:9:9:9:9:9:9:7:7:2; sternal chaetotaXy: 6:9:10:10:10:10:6:6:4:4:2; pleural membrane longitudinally striate, without setae.

GENITALIA ( Figs 22C , 24D ). Small rounded ejaculatory opening; 4 setae arranged linearly above opening, 4 setae congregated under opening and 5 setae below.

LEGS ( Fig. 23A–B ). All legs with tarsus longer than metatarsus; not granulated; femur + patella of leg IV 2.41 times as long as broad; legs III and IV with articulation between femur and patella slightly oblique; tibiae III and IV with medial tactile setae; metatarsi III and IV with basal tactile setae; arolium as long as claws, distally broadened and undivided, claws simple and not serrate.

Female, adult (allotype; Fig. 20A–C )

Same as holotype, except body length 1.11 mm.

PEDIPALP. Trochanter 1.58, femur 2.64, patella 1.67, chela (with pedicel) 2.71, chela (without pedicel) 2.54, hand 1.13 and movable finger 3.88 times as long as broad; 32 distinct teeth on movable finger.

CEPHALOTHORAX. Carapace 1.19 times as long as broad; chaetotaXy of leg coXae I–IV 10:12:8:12.

CHELICERA. Fixed finger with 12, movable finger with 7 teeth. ABDOMEN. Tergal chaetotaXy 7:8:9:8:8:8:9:9:8:7:7:2; sternal chaetotaXy 8:10:11:11:11: 9:9:7:7:4:2.

GENITALIA ( Fig. 24E ). 2 setae arranged linearly on sternite 2 and 8 setae linearly on sternite 3 below opening.

Variation of male paratypes (adults; n =5)

Same as holotype, except body length 1.01–1.23 mm.

PEDIPALP. Trochanter 1.55–1.64, femur 2.38–2.69, patella 1.76–1.94, chela (with pedicel) 2.55–2.95, chela (without pedicel) 2.36–2.75, hand 1.14–1.29 and movable finger 4.29–5.00 times as long as broad; 27 (n =2) or 29 (n=3) juXtadentate teeth on fiXed finger, 35 (n= 1), 36 (n= 3) or 37 (n =1) on movable finger.

CEPHALOTHORAX. Carapace 1.15–1.29 times as long as broad; one paratype with 27 setae arranged 4:6:4:6:7; variation in chaetotaXy of coXae of legs I–IV: 10:10:8:10 (ZMH A0003695), 10:10:6:8 (ZMH A0003696), 8:8:6:10 (ZMH A0003697), 10:10:8:10 (ZMH A0003698), 10:8:8:10 (ZMH A0003699); pedipalpal coxa with 8 (n =2) or 10 (n= 3) setae.

CHELICERA. FiXed finger with 10 (n=1) or 13 (n =2) teeth, movable finger with 6 (n=3) teeth.

ABDOMEN. Same as holotype, eXcept variations in tergal chaetotaXy: 6:7:9:9:9:9:9:9:9:7:6:2 (ZMH A0003695), 7:6:8:9:9:9:9:9:8:6:6:2 (ZMH A0003696), 6:7:8:9:9:9:9:9:9 (ZMH A0003697), 7:8:9:9:9:9:9:9:9:7:6:2 (ZMHA0003698), 7:7:8:9:9:9:9:8:9:9:7:2 (ZMHA0003699); variations in sternal chaetotaxy: 6:10:10:11:11:10:9:7:4:4:2 (ZMH A0003695), 6:8:8:9:9:8:8:9:4:4:2 (ZMH A0003696), 6:9:10:10:10:9:8:9:7:6:2 (ZMH A0003697), 10:10:9:8:8:9:8:8:7:7:2 (ZMH A0003698), 6:9:9:9:10:10:10:8:6:4:2 (ZMH A0003699).

Female dimensions (mm, length/width of allotype)

Body length 1.11 mm. Pedipalps: trochanter 0.18/0.11, femur 0.37/0.14, patella 0.30/0.18, chela (without pedicel) 0.61/0.24, chela (with pedicel) 0.65/0.24, hand length 0.27, movable finger length 0.31. Chelicera 0.25/0.13, movable finger length 0.19. Carapace 0.43/0.36. Leg I: femur 0.11/0.06, patella 0.14/0.06, tibia 0.19/0.06, metatarsus 0.07/0.04, tarsus 0.14/0.03. Leg IV: femur 0.12/0.13, patella 0.21/0.13, tibia 0.27/0.13, metatarsus 0.09/0.05, tarsus 0.15/0.05.

Male dimensions (mm, length/width of holotype followed by range of five paratypes in parentheses) Body length 1.14 mm (1.01–1.23 mm). Pedipalps: trochanter 0.18/0.11 (0.17–0.18/0.10–0.11), femur 0.35/0.13 (0.31–0.35/0.12–0.13), patella 0.32/0.16 (0.29–0.31/0.16–0.17), chela (without pedicel) 0.54/0.21 (0.52–0.56/0.20–0.22), chela (with pedicel) 0.59/0.21 (0.56–0.61/0.20–0.21), hand length 0.26 (0.24–0.27), movable finger length 0.32 (0.30). Chelicera 0.22/0.11 (0.20–0.22/0.10–0.12), movable finger length 0.18 (0.16–0.17). Carapace 0.40/0.32 (0.37–0.42/0.31–0.34). Leg I: femur 0.12/0.06 (0.11– 0.12/0.05–0.07), patella 0.11/0.07 (0.12/0.06–0.07), tibia 0.17/0.04 (0.16–0.18/0.04–0.05), metatarsus 0.07/0.04 (0.08/0.04), tarsus 0.12/0.03 (0.11–0.13/0.03). Leg IV: femur 0.09/0.12 (0.09–0.12/0.10–0.12), patella 0.20/0.12 (0.19–0.20/0.10–0.12), tibia 0.22/0.07 (0.21–0.23/0.06–0.07), metatarsus 0.09/0.05 (0.07–0.09/0.04–0.05), tarsus 0.12/0.04 (0.12–0.13/0.04).

Figures

Fig. 19. Ideoblothrus nadineae sp. nov., holotype, ♂ (QCAZ). A. Habitus in dorsal view. B. Habitus in ventral view. C. Habitus in lateral view. Scale bars = 1 mm.

Fig. 20. Ideoblothrus nadineae sp. nov., allotype, ♀ (QCAZ). A. Habitus in dorsal view. B. Habitus in ventral view. C. Habitus in lateral view. Scale bars = 1 mm.

Fig. 21. Scanning electron micrographs ofIdeoblothrus nadineae sp. nov., paratype, ♂ (ZMHA0003695). A. Carapace with asterisks next to setae. B. Chela in retrolateral view, showing trichobothria. C. Coxa.

Fig. 22. Scanning electron micrographs ofIdeoblothrus nadineae sp. nov., paratype, ♂ (ZMHA0003695). A. Close-up view of chela, showing lanceolate trichobothrium t. B. Chelicera in dorsal view, showing trichobothria. C. Genital area.

Fig. 23. Ideoblothrus nadineaesp. nov., holotype, ♂ (QCAZ). A. Leg I.B. Leg IV.C. Coxa.D. Carapace. E. Serrula exterior. F. Chelicera in dorsal view, showing trichobothria. G. Rallum. Abbreviations: Fe = femur; Pa = patella; Ti = tibia; Me = metatarsus; Ta = tarsus. Scale bars:A–D = 0.25 mm; E = 100 µm; F = 0.125 mm; G = 20 µm.

Fig. 24. Ideoblothrus nadineae sp. nov. A. Chela in dorsal view, showing trichobothria. B. Chela in retrolateral view. C. Chela in ventral view. D. Outer genital area. E. Genital area. A–D: holotype, ♂ (QCAZ); E: allotype, ♀ (QCAZ). Scale bars: A–C, E = 0.25 mm; D = 100 µm.