Description

Description. Adult male (Figs 4 A, 5 A-E, G-I, 6 A, B, D, E-G, I-K). Color: carapace and tergites dark brown; pedipalps reddish brown, paler in trochanter; chelicerae pale yellow. Carapace (Figs 5 A, 6 A): 1.24 x longer than broad; surface smooth, but with a medial furrow; with two distinct eyespots situated near anterior margin of carapace; anterior margin with six setae, posterior margin with seven setae, 47 in total, each seta acicular and very slightly curved; with lyrifissures on both halves. Chelicera (Fig. 6 B, D): much smaller than carapace length; surface smooth; four setae (sbs absent) 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 six large retrorse teeth and three small apical teeth, movable finger with two large teeth; galea present, slender and apically with five dentations (Fig. 6 B). Serrula interior connected to fixed finger for entire length, proximally modified to form velum, serrula exterior with 27 or 29 lamellae, the basal one longest; lamina exterior present. Rallum composed of four blades, the basal two blades shorter than others, the distal one dentated anteriorly, remainder smooth (Fig. 6 D). Pedipalp (Figs 5 B-D, 6 G, K): slightly stout, trochanter 1.80 x, femur 2.46 x, patella 2.02 x, chela with pedicel (without pedicel) 2.68 x (2.43 x), hand with pedicel (without pedicel) 1.71 x (1.46 x) longer than broad; movable chelal finger 0.57 x (0.67 x) longer than hand with pedicel (without pedicel) and 0.37 x (0.41 x) longer than chela with pedicel (without pedicel). Setae generally long and acuminate. Retrolateral surface of trochanter and hand, prolateral surface of patella, femur, and hand granular; trochanter with a rounded 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 closer to et than to 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 ist and isb twice that of ist and it; 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 midway between t and sb (Fig. 6 G). 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 26 or 28 teeth, with 12 sense spots between esb and est; movable chelal finger with 30 or 33 teeth (nearly as large as teeth on fixed chelal finger), basal half with ten sense spots; without accessory teeth (Fig. 6 G). Femur without long tactile setae. Movable chelal finger slightly curved in lateral view (Figs 5 B, 6 G). Opisthosoma: typical, all setae long and acuminate, setal bases distinct larger; pleural membrane longitudinally striate, without setae. Tergites I and XI undivided and other tergites incompletely divided, tergal chaetotaxy I-XI: 8: 8: 8: 12: 13: 7 - 8: 7 - 7: 8 - 7: 8 - 9: 8 - 8 (14 + 2 T): 16 (14 + 2 T). Sternites incompletely divided, sternal chaetotaxy IV-XI: 6 - 5: 8 - 9: 8 - 8: 7 - 7: 7 - 8: 8 - 8: 8 - 8 (14 + 2 T): 14 (10 + 4 T). Anus (tergite XII and sternite XII) without raised rim. Anterior genital operculum with 18 setae, posterior margin with nine setae. Male genitalia (Figs 5 E, 6 I, J): the distal part (l) of lateral apodemes with a distinctive inner ridge curved into semicircle; the hooked branch (br) bowed distally and terminated in a plate-like tip; the proximal part with a distinct dark sclerotized bar (c); the longitudinal fold of medial diverticula (d) with a projection midway along its length, forming a digitiform bulge; the ejaculatory canal atrium (e) not well-developed, curved distally; the lateral rods (f) long and diverging proximally; the tip of dorsal apodeme (g) completely joined; the ventral diverticulum (h) bilobed; genital atrium without genital setae. Legs (Figs 5 G-I, 6 E, F): typical, fairly smooth, slightly stout; junction between femora and patellae I and II oblique. Femoropatella of leg IV 2.74 x longer than deep; tibia 3.43 x longer than deep; with basal tactile setae on tarsal segment: tarsus 4.23 x longer than deep (TS = 0.11); subterminal tarsal setae arcuate and acute. Arolium slightly shorter than claws, not divided; claws smooth. Adult females (Figs 4 B, 5 F, 6 C, H): mostly same as the male, but distinct larger; pedipalps color paler than that of male; carapace 1.17 - 1.23 x longer than broad. Chelicera: galea distinct large, with five large dentations and a bifurcate tip (Fig. 6 C); serrula exterior with 21 lamellae. Pedipalp: stout, trochanter 1.61 - 1.68 x, femur 2.39 - 2.51 x, patella 2.11 - 2.15 x, chela (with pedicel) 2.54 - 2.57 x, chela (without pedicel) 2.29 - 2.35 x, hand (with pedicel) 1.65 - 1.69 x, hand (without pedicel) 1.40 - 1.47 x longer than broad, movable chelal finger 0.55 - 0.58 x (0.63 - 0.68 x) longer than hand with pedicel (without pedicel) and 0.36 - 0.38 x (0.39 - 0.42 x) longer than chela with pedicel (without pedicel). Opisthosoma: genital structure (Figs 5 F, 6 H) simple, spermathecae provided with separated median cribriform plates; anterior genital operculum with 11 short setae, posterior margin with four marginal setae on each side, arranged in a row. Legs: femoropatella of leg IV 2.73 - 2.75 x longer than deep; tibia 3.30 - 3.71 x longer than deep; with basal tactile setae on tarsal segment: tarsus 4.21 - 4.43 x longer than deep (TS = 0.08). Dimensions (length / breadth or, in the case of the legs, length / depth in mm). Male (females in parentheses): body length 4.00 (5.72 - 5.86). Carapace 1.13 / 0.91 (1.23 - 1.29 / 1.05). Pedipalp: trochanter 0.63 / 0.35 (0.57 - 0.58 / 0.34 - 0.36), femur 1.01 / 0.41 (0.98 / 0.39 - 0.41), patella 1.01 / 0.50 (0.97 - 0.99 / 0.46), chela (with pedicel) 1.69 / 0.63 (1.73 - 1.75 / 0.68), chela (without pedicel) 1.53 (1.56 - 1.60), hand (with pedicel) 1.08 (1.12 - 1.15), hand (without pedicel) 0.92 (0.95 - 1.00), movable finger length 0.62 (0.63 - 0.65). Leg I: trochanter 0.21 / 0.20 (0.23 - 0.24 / 0.19 - 0.20), femur 0.33 / 0.26 (0.34 - 0.35 / 0.26), patella 0.54 / 0.24 (0.55 - 0.57 / 0.22 - 0.23), tibia 0.57 / 0.17 (0.58 - 0.59 / 0.17 - 0.18), tarsus 0.50 / 0.12 (0.51 - 0.52 / 0.11 - 0.12). Leg IV: trochanter 0.40 / 0.25 (0.41 - 0.42 / 0.27 - 0.28), femoropatella 0.96 / 0.35 (0.99 - 1.01 / 0.36 - 0.37), tibia 0.72 / 0.21 (0.76 - 0.78 / 0.21 - 0.23), tarsus 0.55 / 0.13 (0.59 - 0.62 / 0.14).

Common Names

Taxonomic Hierarchy

Kingdom: Animalia

Phylum: Arthropoda

Class: Arachnida

Order: Pseudoscorpiones

Family: Atemnidae

Genus: Catatemnus

Species: Catatemnus laminosus Hou, Zhao & Zhang, 2023