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Description of a New Species of the Genus Anatemnus Beier, 1932 (Pseudoscorpiones: Atemnidae) from China

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Description of a New Species of the Genus Anatemnus Beier, 1932 (Pseudoscorpiones: Atemnidae) from China Research Article ISSN 2336-9744 (online) | ISSN 2337-0173 (print) The journal is available on line at www.biotaxa.org/em https://zoobank.org/urn:lsid:zoobank.org:pub:282D3202-B863-4AA1-8A8B-5464E562B0F6 Description of a new species of the genus Anatemnus Beier, 1932 (Pseudoscorpiones: Atemnidae) from China ZHIZHONG GAO & FENG ZHANG* The Key Laboratory of Invertebrate Systematics and Application, College of Life Sciences, Hebei University, Baoding, Hebei 071002, P. R. China; E-mail: [email protected] *Corresponding author: [email protected] Received 25 November 2016 │ Accepted 14 December 2016 │ Published online 16 December 2016. Abstract A new pseudoscorpion species, Anatemnus reni sp. nov., belonging to the family Atemnidae Kishida, 1929, is reported from Yunnan Province, Southwest China. The detailed diagnosis, description and illustrations of important morphological characters are presented in this paper. Key words: taxonomy, pseudoscorpion, morphology. Introduction The pseudoscorpion family Atemnidae Kishida, 1929 contains two subfamilies: Atemninae and Miratemninae. The genus Anatemnus Beier, 1932 belongs to the subfamily Atemninae. It was erected by Beier (1932b) for the species Chelifer javanus Thorell, 1883, and currently includes 21 known species which are widespread in Africa, North America, South America, Australia and Asia (Hu and Zhang 2012; Harvey 2013; Alexander et al. 2014). More than half of the species (12) are distributed in Southeast Asia, and only two, A. chaozhouensis Hu and Zhang, 2012 and A. orites (Thorell, 1889), have been recorded in China (Hu and Zhang 2012; Harvey 2013). While examining pseudoscorpion samples collected under bark from Yunnan Province, China, we found one atemnid specimen which conforms to the following generic characters of Anatemnus: distance between trichobothrium it and fingertip equals that between ist and isb; distance between est and esb longer than that between ist and isb; pedipalpal patella not evidently expanded and nearly oval (Beier 1932a; Hu and Zhang 2012). For these reasons we placed it within the genus Anatemnus as a new species. The aim of the current study is to describe and diagnose the new pseudoscorpion species. Material and Methods The material was preserved in 75% ethyl alcohol. Photographs were taken by a Leica M205a stereomicroscope equipped with a Leica DFC550 camera and using a LAS software (Ver. 4.6), from which the latter was also used for drawings (with a drawing tube) and measurements. Detailed examination was carried out with an Olympus BX53 compound light microscope. Temporary slide mounts were made in glycerol. The specimens are deposited in the Museum of Hebei University (MHBU), Baoding City, China. Ecol. Mont., 7, 2016, 567-572 NEW SPECIES OF THE GENUS ANATEMNUS FROM CHINA Terminology and mensuration mostly follow Chamberlin (1931), with some minor modifications to the terminology of trichobothria (Harvey 1992), chelicerae (Judson 2007) and faces of appendages (Harvey et al. 2012). The chela and chelal hand are measured in lateral view. All measurements are given in mm unless noted otherwise. The following abbreviations are used in the text. Chelal trichobothria: 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. Cheliceral setae: es = exterior seta; is = interior seta; ls = laminal sata; bs = basal seta. Taxonomy Family Atemnidae Kishida, 1929 Genus Anatemnus Beier, 1932 Beier, 1932a: 578; Beier, 1932b: 48; Harvey, 1991: 451. Anatemnus reni sp. nov. (Figs. 1–3) Type material. Holotype male (Ps.–MHBU–YN070803): China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Mengla County, Mohan Town (Now called Shangyong Town), under bark [N21°14′38.20″ E101°43′27.08″], 3,205 m a.s.l., 3 August 2007, Guodong Ren leg. Figure 1. Anatemnus reni sp. nov., holotype male: habitus, dorsal view. 568 GAO & ZHANG Figure 2. Anatemnus reni sp. nov., holotype male: a. carapace, dorsal view; b. left pedipalp, dorsal view; c. left pedipalpal chela, retro-lateral view; d. trochanter of left pedipalp, retro-lateral view; e. genital area, ventral view; f. tarsus of left leg IV, lateral view; g. left leg I, lateral view; h. left leg IV, lateral view. Scale bars: 0.50 mm (a and b) and 0.20 mm (c-h). Etymology. The new species is named after Prof. Dr. Guodong Ren, who collected and donated the specimen to the author of this study. Diagnosis. The new species differs from most congeners by the presence of two well-developed conical tubercles on pedipalpal trochanter (Beier 1932a; With 1906, 1908), while from the morphologically Ecol. Mont., 7, 2016, 567-572 569 NEW SPECIES OF THE GENUS ANATEMNUS FROM CHINA closest species (Anatemnus elongatus (Ellingsen, 1902), A. rotundus (With, 1906), A. vermiformis (With, 1906) and A. voeltzkowi (Ellingsen, 1908)) differs by the bicolor carapace, the gaping pedipalpal chelal fingers, the grouped trichobothria eb, esb, ib and isb situated basally and the widely spaced trichobothria it and isb. Figure 3. Anatemnus reni sp. nov., holotype male: a. carapace, dorsal view (the position of lyrifissures indicated by black bars); b. left chelicera, dorsal view; c. left rallum; d. left galea; e. left pedipalp without chela, dorsal view; f. left pedipalpal chela, retro-lateral view; g. distal part of left pedipalpal chela, retro-lateral view; h. tarsus of left leg IV, lateral view; i. left leg I, lateral view; j. left leg IV, lateral view. Scale bars: 0.25 mm (a, e-j) and 0.10 mm (b-d). 570 GAO & ZHANG Description. Body moderately flattened. Pedipalps and anterior half of carapace reddish-brown, legs, tergites and sternites yellowish-brown. Body setae straight, acuminate and short (Fig. 1). Each chelicera with four setae on hand (sbs absent) (Fig. 3b), surface smooth. Movable finger with one sub-distal seta. Trichobothria bs and es finely dentated, is and ls long and acute. Movable finger with 2-3 tiny teeth distally, while fixed finger with 4-5 moderately-sized pointed teeth. One lyrifissure present on fixed finger basally (Fig. 3b); galea with a bifurcate tip and one small sub-median ramus (Fig. 3d); rallum composed of four blades, only the distal one dentated anteriorly (Fig. 3c); serrula exterior with 23-24 blades; lamina exterior present, moderately broad. Pedipalp. Mostly smooth; setae moderately long and acicular. Trochanter elongated, with two well- developed conical tubercles (Fig. 2d, 3e); both chelal fingers gaping (Fig. 3g); trochanter 1.36, femur 2.72, patella 2.48, chela (with pedicel) 3.35, chela (without pedicel) 3.12, hand (with pedicel) 2.19, hand (without pedicel) 1.96 times as long as broad, movable finger 0.58 times as long as hand with pedicel. Femur without long tactile setae. Fixed chelal finger with eight trichobothria, whilst movable chelal finger with four trichobothria (Fig. 3g): eb, esb, ib and isb grouped and situated basally; esb in the middle between eb and isb; ist near to it, near the middle of fixed finger; est in the middle of fixed finger; ist distal to isb and est; et near sub-distal end of fixed finger; sb closer to b than to st; t slightly closer to st than to tip of movable finger; with no microsetae present on both fingers. Venom apparatus present only in fixed finger, venom ducts short and slender. Fixed finger with 28-29 pointed teeth, while movable finger with 35-36 pointed teeth except basally, where teeth are obtuse; with one accessory tooth in tip of fixed finger. Carapace (Fig. 2a, 3a). Smooth, 1.35 times as long as broad; anterior half of the carapace reddish- brown, remaining part yellowish-brown; without transverse furrow; with a pair of eyespots situated near anterior margin of carapace; with ca. 45 setae in total, including two on anterior and 10 on posterior margin; with two pairs of lyrifissures (indicated by black bars in Fig. 3a). Manducatory process with one long seta and three short setae. Abdomen. Pleural membrane longitudinally striate. Tergites divided except the first three, sternites unconspicuously divided. Tergal chaetotaxy (I-XI): 9: 10: 10: 7-8: 7-7: 8-7: 7-8: 8-9: 8-12: 8-10: 11 + 2T; all setae acicular. Sternal chaetotaxy (IV-XI): 7-8: 8-9: 9-9: 7-9: 8-9: 8-9: 10-10: 14 + 2T; setae uniseriate and acuminate; each tergite and sternite with 2-4 lyrifissures; male genital area as in the Fig. 2e; glandular setae absent, but some tactile spots present; anus with four setae, not surrounded by sternite XI. Legs (Figs. 2g, 2h, 3i, 3j). The junction between femora and patellae I and II oblique; femur + patella of leg IV 2.79 times as long as broad; tactile seta on tarsus IV (Fig. 3h) situated proximally (TS = 0.15); sub- terminal tarsal setae curved and apically acute; arolium undivided, clearly shorter than smooth and large claws. Measurements (length/breadth or height in mm, ratios in parentheses). Body length 4.68. Pedipalps: trochanter 0.64/0.47 (1.36), femur 1.25/0.46 (2.72), patella 1.24/0.50 (2.48), chela (with pedicel) 1.91/0.57 (3.35), chela (without pedicel) 1.78 (3.12), hand length (with pedicel) 1.25 (2.19), hand length (without pedicel) 1.12 (1.96); movable finger length 0.73. Carapace 1.27/0.94 (1.35). Leg I: trochanter 0.23/0.21 (1.10), femur 0.37/0.25 (1.48), patella 0.59/0.24 (2.46), tibia 0.54/0.17 (3.18), tarsus 0.40/0.12 (3.33); leg IV: trochanter 0.39/0.23 (1.70), femur + patella 1.09/0.39 (2.79), tibia 0.76/0.23 (3.30), tarsus 0.48/0.13 (3.69).
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