Catatemnus tengchongensis, Hou & Zhao & Zhang, 2023

Hou, Yanmeng, Zhao, Lingchen & Zhang, Feng, 2023, First record of the genus Catatemnus Beier, 1932 from China, with the description of six new species (Pseudoscorpiones, Atemnidae), ZooKeys 1168, pp. 295-327 : 295

Catatemnus tengchongensis sp. nov.

Figs 13 , 14 , 15 (腾冲猫伪蝎)

Type material.

Holotype: China • ♂; Yunnan Province, Tengchong City, Houqiao Town, Yangjiatian Village; 25°21.413'N, 98°15.308'E; 1824 m a.s.l.; 07 Jun. 2017; Chi Jin, Beibei Zhou and Xiao Zang leg.; Ps.-MHBU-YNTC171201. Paratypes: • 3♀; same data as the holotype; Ps.-MSWU-YNTC171202-04.

Diagnosis (♂♀).

This new species is characterized by: the serrula exterior with 25 lamellae; movable chelal finger with 28 teeth; palpal femur (♂) 2.59 ×, (♀) 2.42-2.52 ×, chela with pedicel (♂) 2.72 ×, (♀) 2.57-2.67 ×, chela without pedicel (♂) 2.51 ×, (♀) 2.37-2.42 × longer than broad; distance between est and esb farther to that of ist and isb.

Description.

Adult male (Figs 13A , 14A-D, F-I , 15A, B, D-H, J ). Color: carapace dark brown, slightly paler in tergites and sternites; pedipalps reddish brown, but paler in trochanter; legs pale yellow. Carapace (Figs 14A , 15A ): 1.20 × longer than broad; surface smooth, but with a medial furrow; with two distinct eyespots situated near anterior margin of carapace; anterior margin with five setae, posterior margin with eight setae, each seta acicular and very slightly curved. Chelicera (Fig. 15B, D ): much smaller than carapace length; surface smooth; four setae (sbs absent; es shorter than others) and two lyrifissures (exterior condylar lyrifissure and exterior lyrifissure) present on hand; movable finger with one galeal seta (shorter than others); bs and es dentate apically, is and ls long and acute. Fixed finger with seven unequally sized teeth, movable finger with two large teeth; galea present, shorter with two small branchlets and two dentations (Fig. 15B ). Serrula interior connected to fixed finger for entire length, proximally modified to form velum, serrula exterior with 25 lamellae, the basal one longest; lamina exterior present. Rallum composed of four blades, the basal two blades shorter than others, the distal two dentated anteriorly, remainder smooth (Fig. 15D ). Pedipalp (Figs 14B-D , 15G, J ): stout, trochanter 1.77 ×, femur 2.59 ×, patella 1.95 ×, chela with pedicel (without pedicel) 2.72 × (2.51 ×), hand with pedicel (without pedicel) 1.66 × (1.45 ×) longer than broad; movable chelal finger 0.64 × (0.74 ×) longer than hand with pedicel (without pedicel) and 0.39 × (0.42 ×) longer than chela with pedicel (without pedicel). Setae generally long and acuminate. All segments (except chelal fingers) with fine granulations; trochanter with an inconspicuous ventral tubercle and a well-developed conical dorsal tubercle. Fixed chelal finger with eight trichobothria, movable chelal finger with four trichobothria: eb and esb situated at base of fixed finger on retrolateral face, esb slightly distal to eb; ib and isb situated at base of fixed finger on prolateral face, isb slightly distal to ib; est in the middle of fixed finger; et near sub-distal of fixed finger; est midway between et and esb; it slightly distal to est and proximal to et; ist situated proximal to est and distal to isb; it closer to ist than to fingertip; distance between est and esb farther to that of ist and isb; distance between it and fingertip nearly equal to distance between ist and isb; b and sb situated at base of movable finger on retrolateral face; t in the middle of movable finger and at same level as est; sb closer to b than to st; st closer to sb than to t (Fig. 15G ). Venom apparatus only present in fixed chelal finger, venom ducts curved and short, terminating in inflated nodus ramosus between et and est. Both chelal fingers with a row of acute teeth, spaced contiguously along the margin, slightly rounded proximally: fixed chelal finger with 24 teeth; movable chelal finger with 28 teeth (nearly as large as teeth on fixed chelal finger); without accessory teeth (Fig. 15G ). Femur without long tactile setae. Movable chelal finger slightly curved in lateral view (Figs 14B , 15G ). Opisthosoma: typical, all setae long and acuminate; pleural membrane longitudinally striate, without setae. Tergites incompletely divided, tergal chaetotaxy I-XI: 10: 8: 5: 11: 13: 14: 15: 15: 17: 17(13 + 4T): 12(10 + 2T). Sternites X and XI undivided and other sternites divided, sternal chaetotaxy IV-XI: 5-5: 8-8: 8-8: 7-8: 7-7: 7-7: 18: 16; sternites X and XI each with two pairs of long tactile setae. Anus (tergite XII and sternite XII) without raised rim. Anterior genital operculum with five or seven setae on each side, posterior margin with eight setae. Legs (Figs 14G-I , 15E, F ): generally typical, fairly smooth, slightly stout; junction between femora and patellae I and II oblique. Femoropatella of leg IV 2.80 × longer than deep; tibia 3.86 × longer than deep; with basal tactile setae on tarsal segment: tarsus 3.55 × longer than deep (TS = 0.10); subterminal tarsal setae arcuate and acute. Arolium slightly shorter than claws, not divided; claws smooth.

Adult females (Figs 13B , 14E , 15I ): mostly same as the male, but larger and paler. Chelicera: galea distinct relatively short, with five distinct larger branchlets (Fig. 15C ); serrula exterior with 25 lamellae, the basal one longest. Pedipalp: stout, trochanter 1.67-1.78 ×, femur 2.42-2.52 ×, patella 2.00-2.25 ×, chela (with pedicel) 2.57-2.67 ×, chela (without pedicel) 2.37-2.42 ×, hand (with pedicel) 1.61-1.69 ×, hand (without pedicel) 1.41-1.44 × longer than broad, movable chelal finger 0.58-0.60 × (0.68 ×) longer than hand with pedicel (without pedicel) and 0.37 × (0.40-0.41 ×) longer than chela with pedicel (without pedicel); palpal coxa with four apical setae, sub-terminal seta larger; all segments (except chelal fingers) with fine granulations. Opisthosoma: tergites incompletely divided, tergal chaetotaxy I-XI: 8: 9: 10: 13: 16: 14: 15: 17: 15: 16(12 + 4T): 11(9 + 2T). Sternites divided, sternal chaetotaxy IV-XI: 7-8: 8-8: 8-8: 8-9: 8-8: 9-9: 16(12 + 4T): 14(12 + 2T). Genitalia simple, spermathecae provided with separated median cribriform plates; anterior genital operculum with five setae on each side, posterior margin with four or five setae on each side. Legs: femoropatella of leg IV 2.81-2.93 × longer than deep; tibia 3.28-3.41 × longer than deep; with basal tactile setae on tarsal segment: tarsus 3.75-4.00 × longer than deep (TS = 0.09-0.11).

Dimensions (length/breadth or, in the case of the legs, length/depth in mm). Male (females in parentheses): body length 2.73 (4.25-4.40). Carapace 0.85/0.71 (0.93-1.01/0.80-0.84). Pedipalp: trochanter 0.46/0.26 (0.45-0.48/0.27), femur 0.75/0.29 (0.75-0.78/0.31), patella 0.72/0.37 (0.72-0.81/0.36), chela (with pedicel) 1.28/0.47 (1.39/0.52-0.54), chela (without pedicel) 1.18 (1.26-1.28), hand (with pedicel) 0.78 (0.87-0.88), hand (without pedicel) 0.68 (0.75-0.76), movable finger length 0.50 (0.51-0.52). Leg I: trochanter 0.18/0.15 (0.17-0.20/0.14-0.17), femur 0.25/0.19 (0.24-0.26/0.20-0.21), patella 0.37/0.17 (0.41/0.18), tibia 0.39/0.12 (0.42-0.44/0.12), tarsus 0.38/0.09 (0.40-0.42/0.08-0.09). Leg IV: trochanter 0.29/0.16 (0.32-0.33/0.21), femoropatella 0.70/0.25 (0.76-0.79/0.27), tibia 0.54/0.15 (0.58-0.59/0.17-0.18), tarsus 0.39/0.11 (0.44-0.45/0.11-0.12).

Remarks.

Catatemnus tengchongensis sp. nov. can be distinguished from C. birmanicus by the smaller body size (♂) (e.g., body length 2.73 mm vs 4.27 mm; palpal femur 2.59 × vs 2.44 × longer than broad, length 0.75 mm vs 1.09 mm; movable chelal finger length 0.50 mm vs 0.78 mm) and the trait of eyespots (with two distinct eyespots vs with two faint eyespots); from C. concavus by the trait of eyespots (with two distinct eyespots vs with two faint eyespots), the stouter pedipalps (♀) (e.g., palpal femur 2.42-2.52 × vs 2.29 × longer than broad, length 0.75-0.78 mm vs 0.90 mm) and the traits of the three first tergites (regularly convex from the one side to the other vs with a descending lateral portion, perpendicular on the dorsal part); from C. monitor by the trait of eyespots (with two distinct eyespots vs no eyespots visible) and the stouter pedipalps (e.g., palpal femur (♂) 2.59 × vs 2.25 ×, (♀) 2.42-2.52 × vs 2.27 × longer than broad, length (♂) 0.75 mm vs 1.01 mm, (♀) 0.75-0.78 mm vs 0.95 mm); from C. nicobarensis by the trait of eyespots (with two distinct eyespots vs with two indistinct eyespots) and the traits of the palpal trochanter (anterior surface granular vs smooth or almost smooth); from C. thorelli by the trait of furrow on the carapace (distinctly curved vs almost straight) and the traits of pedipalps (surface of all segments except chelal fingers granular vs surface of palps smooth; palpal femur 2.59 × vs 2.40 × longer than broad, length 0.75 mm vs 1.15 mm; movable chelal finger teeth length 0.50 mm vs 0.70 mm) ( Thorell 1889; Balzan 1891; With 1906; Beier 1932).

Distribution.

Known only from the type locality.

Etymology.

Named after the type locality, Tengchong (Yunnan).

Figures

Figure 13. Catatemnus tengchongensis sp. nov. A holotype male, habitus (dorsal view) B paratype female, habitus (dorsal view). Scale bars: 2.00 mm (B); 1.00 mm (A).

Figure 14. Catatemnus tengchongensis sp. nov., holotype male (A-D, F-I), paratype female (E) A carapace (dorsal view) B left chelal fingers (lateral view) C left chela (lateral view) D left pedipalp (dorsal view) E female genital area (ventral view) F male genital area (ventral view) G tarsus of left leg IV (lateral view) H left leg I (lateral view) I left leg IV (lateral view). Scale bars: 0.50 mm (A, C, D); 0.20 mm (B, E-I).

Figure 15. Catatemnus tengchongensis sp. nov., holotype male (A, B, D-H, J), paratype female (C, I) A carapace (dorsal view) B male galea C female galea D rallum E left leg I (lateral view) F left leg IV (lateral view) G left chelal fingers (lateral view), with details of trichobothrial pattern H male genital area (ventral view) I female genital area (ventral view) J left pedipalp (dorsal view). Scale bars: 0.50 mm (F, J); 0.25 mm (A, E, G-I); 0.10 mm (B-D). Abbreviations: b = basal; sb = sub-basal; st = sub-terminal; t = terminal; ib = interior basal; isb = interior sub-basal; ist = interior sub-terminal; it = interior terminal; eb = exterior basal; esb = exterior sub-basal; est = exterior sub-terminal; et = exterior terminal.