Ideoblothrus safinai, 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 : 135-143

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Ideoblothrus safinai

sp. nov.

Ideoblothrus safinai sp. nov.

Figs 25–30 View Fig View Fig View Fig View Fig View Fig View Fig


Ideoblothrus safinai sp. nov. differs from I. amazonicus , I. brasiliensis , I. caecus , I. kochalkai , I. levipalpus , I. paraensis and I. tenuis in the dimensions of the carapace (♀ I. safinai sp. nov. carapace 0.66/ 0.56 mm, ♂ 0.54–0.59/ 0.44–0.51 mm; ♀ I. amazonicus 0.37 mm; ♀ I. brasiliensis 0.36/ 0.26 mm; ♀ I. caecus 0.56 mm; ♂ I. kochalkai carapace length 0.74 mm; ♀ I. levipalpus 0.38/ 0.38 mm; I. paraensis 0.43–0.46/ 0.34–0.37 mm; ♀ I. tenuis 0.47/ 0.35–0.37 mm). It differs from I. costaricensis and I. fenestratus in the dimensions of the pedipalps (♂ I. safinai sp. nov. femur 0.43–0.52, patella 0.39–0.40, chela (without pedicel) 0.76–0.91, hand 0.38–0.47, pedicel 0.06–0.10 and movable finger 0.38–0.47 mm long, chela (with pedicel) 2.73–3.00 times as long as broad; I. costaricensis hand length (without pedicel) 0.31 mm; ♂ I. fenestratus chela (with pedicel) 2.50–2.60 times as long as broad). It differs from I. colombiae in the chaetotaxy of the carapace (♂ I. safinai sp. nov. with 30 setae arranged 2:4:6:4:6:8; ♂ I. colombiae with 21 setae arranged 4:4:4:4:5 or only 4 at posterior margin).


This species is a patronym for Professor Carl Safina, an American ecologist, whom the first author admires for his academic and literary work.

Material examined

Holotype ECUADOR • ♂; Pichincha Province, La Unión del Toachi, Otongachi Natural Reserve ; 00°19ʹ16.662ʺ S, 78°57ʹ5.867ʺ W; alt. 900 m; Aug. 2013; E.E. Tapia and N. Dupérré leg.; sifting litter and berlese traps; QCAZ. GoogleMaps

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

Paratypes ECUADOR • 2 ♂♂; same collection data as for holotype; ZMH A0015394 View Materials , ZMH A0015395 View Materials GoogleMaps 2 ♂♂; same collection data as for holotype, but 25 Aug. 2013; ZMH A0015397 View Materials , ZMH A0015398 View Materials GoogleMaps .

Other material

ECUADOR • 1 tritonymph; same collection data as for holotype; ZMH A0015396 View Materials GoogleMaps .


Male, adult (holotype, Fig. 25A–C View Fig )

COLOUR. Prosoma and pedipalps dark brown, opisthosoma light brown, femora and patella of the pedipalps with a pattern of light brown circles. Body length 2.03 mm.

PEDIPALP ( Figs 28A, C View Fig , 30A–C View Fig ). Setae on prolateral margin long and acicular; trochanter 1.67, femur 2.32, patella 1.63, chela (with pedicel) 2.73, chela (without pedicel) 2.53, hand 1.23 and movable finger 3.80 times as long as broad; patella with one lyrifissure situated dorsally on pedicel. Chela not granulated. FiXed chelal finger with 8 trichobothria, movable finger with 4 trichobothria: eb and esb situated medially on retrolateral face of hand, isb slightly above base of finger, distance between isb, est and et very similar, 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 lanceolate. Venom apparatus present only in fiXed finger, venom duct rather short. Teeth rounded and juXtadentate, 32 teeth on fiXed finger, 41 on movable finger.

CEPHALOTHORAX ( Figs 27A, C View Fig , 29C–D View Fig ). Carapace 1.20 times as long as broad, rectangular in shape, with pointy ends at top corners; no eyes; epistome triangular; 30 setae arranged 2:4:6:4:6:8; without furrows; two pairs of lyrifissures, first pair situated near anterior margin, second pair situated near setae on posterior row; chaetotaXy of leg coXae I–IV: 12:12:8:10, pedipalpal coXa with 11 setae and 2 apical setae. Posterior section of coxae II slightly overlapping anterior section of coxae III.

CHELICERA ( Figs 27B, D View Fig , 29E–G View Fig ). 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 es, gs situated subdistally on movable finger; fiXed finger with 8 indistinct teeth, movable finger with 10 distinct teeth; rallum with 6 dentate blades, serrula exterior with 25 blades, serrula interior with 6 blades; galea short, rather straight, not extending past tip of movable finger, without rami.

ABDOMEN ( Fig. 27E View Fig ). Tergites and sternites undivided; tergal chaetotaXy: 6:7:8:8:8:8:6:7:8:6:6:2; sternal chaetotaXy: 6:8:9:9:8:9:9:4:2:2; pleural membrane longitudinally striate, without setae.

GENITALIA ( Fig. 29H View Fig ). Small rounded ejaculatory opening, 4 setae arranged linearly above opening, 4 setae congregated under opening and 8 setae below.

LEGS ( Figs 28B View Fig , 29A–B View Fig ). All legs with tarsus longer than metatarsus; not granulate; femur + patella of leg IV 2.96 times as long as broad; legs III and IV with articulation between femur and patella slightly oblique; tibiae III and IV and metatarsi III and IV with tactile setae sub-basally; arolium as long as claws, distally broadened and undivided; claws simple and not serrate.

Female, adult (allotype, Fig. 26A–C View Fig )

Same as holotype, except body length 2.22 mm.

PEDIPALP. Trochanter 1.68, femur 2.67, patella 1.86, chela (with pedicel) 2.84, chela (without pedicel) 2.63, hand 1.34 and movable finger 4.45 times as long as broad.

CEPHALOTHORAX. Same as holotype except carapace 1.18 times as long as broad; 25 setae arranged 4:5:4:4:2:6; chaetotaXy of leg coXae I–IV: 14:10:12:10; pedipalpal coXa with 12 setae.

CHELICERA. Same as holotype.

ABDOMEN. Same as holotype eXcept tergal chaetotaXy: 7:8:8:8:9:9:9:9:7:9:4:2; sternal chaetotaXy: 7:6:7:7:7:8:7:7:7:2:4:2.

GENITALIA ( Fig. 29I View Fig ). Setae arranged linearly in two rows 5:6 on sternite 2 and 7 setae arranged linearly on sternite 3 below opening.

LEGS. Same as holotype, except femora slightly longer than patella in legs I–II.

Variation of male paratypes (adults, n=4)

Same as holotype, except body length 1.39–2.32 mm.

PEDIPALP. Trochanter 1.47–1.69, femur 2.16–2.56, patella 1.60–1.81, chela (with pedicel) 2.78–3.00, chela (without pedicel) 2.53–2.63, hand 1.24–1.52 and movable finger 4.56–4.78 times as long as broad.

CEPHALOTHORAX. Carapace 1.11–1.17 times as long as broad; either 30 setae arranged 2:4:6:4:6:8 (n=2) or 29 setae arranged 2:4:6:4:7:6 (n=2); variation in chaetotaXy of coXae of legs I–IV: 9:10:8:12 (ZMH A0015395), 13:11:8:10 (ZMH A0015394), 13:10:8:10 (ZMH A0015398), 12:10:8:10 (ZMH A0015397); pedipalpal coxa with 12 setae.

ABDOMEN. Tergal chaetotaXy variation: 7:8:8:8:8:8:8:8:8:8:4:2 (ZMH A0015395), 7:7:9: 9:9:9:9:9:9:9:4:2 (ZMH A0015394), 7:7:7:8:8:9:9:9:9:9:4:2 (ZMH A0015398), 7:7:9: 9:8:9:8:9:8:6:4:2 (ZMH A0015397); sternal chaetotaxy variation: 6:9:9:10:10:8:9:9:9:4:2 (ZMH A0015395), 7:8:9:10:10:10:10:7:4:2 (ZMH A0015394), 6:8:8:7:9:9:9:9:4:2 (ZMH A0015398), 6:7:7:8:8:7:8:8:4:2 (ZMH A0015397).


Same as holotype, except body length 1.57 mm.

PEDIPALP ( Fig. 30D–F View Fig ). Trochanter 1.63, femur 2.76, patella 1.73, chela (with pedicel) 2.57, chela (without pedicel) 2.40, hand 1.25 and movable finger 4.90 times as long as broad. FiXed chelal finger with 7 trichobothria, movable with 3 trichobothria: it and sb absent, eb situated at base of fiXed finger, esb, isb and ib situated on dorsal side of fiXed finger, ist and est close together, et situated sub-distally;

b situated sub-basally, st and t situated medially on movable finger. Teeth rounded and juXtadentate, 37 teeth on fiXed finger, no distinct teeth on movable finger.

CEPHALOTHORAX. Same as holotype except carapace 1.09 times as long as broad; 29 setae arranged 2:4:6:4:7:6; chaetotaXy of coXae of legs I–IV: 11:12:8:12, pedipalpal coXa with 14 setae.

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

LEGS. All legs with tarsus longer than metatarsus; arolium as long as claws, distally broadened and undivided; claws simple and not serrate.

Female dimensions (mm, length/width of allotype)

Body length 2.22 mm. Pedipalps: trochanter 0.32/0.19, femur 0.56/0.21, patella 0.54/0.29, chela (with pedicel) 1.08/0.38, chela (without pedicel) 1.00/0.38, hand length 0.51, movable finger length 0.49. Chelicera: 0.36/0.19, movable finger length 0.30. Carapace: 0.66/0.56. Leg I: femur 0.22/0.11, patella 0.21/11, tibia 0.23/0.06, metatarsus 0.13/0.04, tarsus 0.19/0.04. Leg IV: femur 0.21/0.17, patella 0.25/0.17, tibia 0.33/0.07, metatarsus 0.10/0.07, tarsus 0.19/0.06.

Male dimensions (mm, length/width of holotype followed by range of four paratypes in paretheses) Body length 2.03 mm (1.39–2.32 mm). Pedipalps: trochanter 0.25/0.15 (0.22–0.27/0.15–0.16), femur 0.44/0.19 (0.41–0.52/0.18–0.21), patella 0.39/0.24 (0.39–0.49/0.23–0.27), chela (without pedicel) 0.76/0.30 (0.79–0.91/0.29–0.36), chela (with pedicel) 0.82/0.30 (0.87–1.01/0.29–0.36), hand length 0.38 (0.38–0.47), movable finger length 0.38 (0.41–0.47). Chelicera 0.26/0.16 (0.31–0.34/0.12–0.17), movable finger length 0.25 (0.24–0.27). Carapace 0.54/0.45 (0.50–0.59/0.44–0.51). Leg I: femur 0.16/0.06 (0.15–0.19/0.04–0.10), patella 0.19/0.08 (0.19–0.21/0.07–0.09), tibia 0.25/0.05 (0.24– 0.26/0.06–0.07), metatarsus 0.1/0.05 (0.09–0.11/0.04–0.06), tarsus 0.17/0.04 (0.15–0.18/0.04–0.05). Leg IV: femur 0.18/0.15 (0.15–0.26/0.15–0.17), patella 0.26/0.15 (0.24–0.26/0.15–0.17), tibia 0.34/0.09 (0.29–0.39/0.08–0.10), metatarsus 0.12/0.07 (0.09–0.12/0.06–0.07), tarsus 0.19/0.05 (0.16–0.21/0.05– 0.07).

Tritonymph dimensions (mm, length/width)

Body length 1.57 mm. Pedipalps: trochanter 0.25/0.15, femur 0.44/0.19, patella 0.39/0.24, chela (without pedicel) 0.76/0.3, chela (with pedicel) 0.82/0.3, hand length 0.44, movable finger length 0.38. Chelicera: 0.26/0.16, movable finger length 0.25. Carapace 0.54/0.45. Leg I: femur 0.16/0.06, patella 0.19/0.08, tibia 0.25/0.05, metatarsus 0.1/0.05, tarsus 0.17/0.04. Leg IV: femur 0.18/0.15, patella 0.26/0.15, tibia 0.34/0.09, metatarsus 0.12/0.07, tarsus 0.19/0.05


USA, Illinois, Chicago, Field Museum of Natural History (also used by Finnish Museum of Natural History)


Museo de Zoologia, Pontificia Universidad Catolica del Ecuador


Zoologisches Museum Hamburg