© Entomologica Fennica. 30 December 2014 Two new species of the pseudoscorpion genus Lagynochthonius from China (Pseudoscorpiones: Chthoniidae) Fubin Zhang & Feng Zhang* Zhang, F. & Zhang, F. 2014: Two new species of the pseudoscorpion genus Lagynochthonius from China (Pseudoscorpiones: Chthoniidae). — Entomol. Fennica 25: 170–179. Two new pseudoscrorpion species belonging to the genus Lagynochthonius of the family Chthoniidae are described from China: Lagynochthonius brachy- digitatus sp. n., from Zhejiang Province, and L. medog sp. n., from Xizang Au- tonomous Region. Lagynochthonius microdentatus Hu & Zhang, 2012 is found to be a junior primary homonym of L. microdentatus Mahnert, 2011 and is re- placed with Lagynochthonius harveyi Hu & Zhang, nom. n. F. Zhang & F. 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 22 April 2014, accepted 19 July 2014 1. Introduction chelal finger displaced onto the dorso-antiaxial face (Judson 2007). The arachnid order Pseudoscorpiones is a cosmo- While examining pseudoscorpion specimens politan group of small arthropods mainly occur- collected from Jiulong Mountains (Zhejiang Pro- ring in leaf litter, under rocks and stones, or with- vince) and Medog County (Xizang Autonomous in caves. There are 26 families currently recog- Region) in China, we found two new species of nized, including 3,533 species in 454 genera Lagynochthonius, which we here name L. bra- (Harvey 2013). Chthoniidae, currently contain- chydigitatus sp. n. and L. medog sp. n. We also ing 28 genera and 650 species worldwide, is the provide the replacement name Lagynochthonius second-most speciose family in the order. To harveyi Hu & Zhang, nom. n. for Lagyno- date, only two genera (Lagynochthonius Beier, chthonius microdentatus Hu & Zhang, 2012. 1951, and Tyrannochthonius Chamberlin, 1929) of the tribe Tyrannochthoniini have been re- corded from China (Harvey 2013). 2. Material and methods The genus Lagynochthonius was erected by Beier (1951) as a subgenus of Tyrannochthonius The terminology used in this paper follows Chamberlin, but Chamberlin (1962) later ele- Chamberlin (1931), Harvey (1992) and Judson vated it to generic status. The genus is character- (2007). The setal formula of the palp femur fol- ized by the flask-shaped chelal hand, the greatly lows Vachon (1941) (rows in sequence anterior- enlarged sclerotic apodeme of the movable finger anterodorsal-dorsal-posterodorsal-posterior- and the modified tooth (or distal tooth) of fixed ventral). All specimens are preserved in 75% al- ENTOMOL. FENNICA Vol. 25 • Two new species of pseudoscorpions from China 171 Fig. 1. Habitus of Lagynochthonius brachydigitatus sp. n., dorsal view. – a. Holo- type male. – b. Para- type female. cohol, and they were examined and illustrated us- 3.1. Lagynochthonius harveyi ing a Leica 205A stereomicroscope with a draw- Hu & Zhang, nom. n. ing tube, which was also used for the measure- ments. Hu & Zhang (2012) published a new Lagyno- Detailed examination was carried out with an chthonius species (collected from Yunnan Pro- Olympus BX53 general optical microscope. vince, China) which was named L. microden- Temporary slide mounts were made in glycerol. tatus, but, unfortunately, the same name had been All measurements are given in millimetres. The used by Mahnert (2011) for a different Lagyno- type specimens are deposited in the Museum of chthonius species (collected from the Canary Is- Hebei University (MHBU), Baoding City, China. lands, Spain). Mark Harvey (personal communi- The following abbreviations are used in the cation, 2013) pointed out to us that Lagyno- text for the trichobothria: b = basal; sb = sub- chthonius microdentatus Hu & Zhang, 2012 is a basal; st = sub-terminal; t =terminal;ib =interior junior primary homonym of Lagynochthonius basal; isb = interior sub-basal; ist = interior sub- microdentatus Mahnert, 2011. Therefore, we terminal; it = interior terminal; eb =exterior here provide the replacement name Lagyno- basal; esb = exterior sub-basal; est = exterior sub- chthonius harveyi Hu & Zhang, nom. n. for terminal; et = exterior terminal; dx = duplex Lagynochthonius microdentatus Hu & Zhang, trichobothria. Carapacal chaetotaxy is expressed 2012. in the form 6–2 (18), where 18 refers to the total number of setae, 6 the number on the anterior 3.2. Descriptions of new species margin and 2 the number on the posterior margin. 3.2.1. Lagynochthonius brachydigitatus sp. n. (Figs. 1–3) 3. Genus Lagynochthonius Beier, 1951 Type material. Holotype male (Ps.-MHBU- Lagynochthonius Beier, 1951: 61; Chamberlin, ZJ13070401): China, Zhejiang Province, 1962: 314; Judson, 2007: 53–68; Mahnert, 2011: Suichang County, Jiulong Mountains, Yanping 33–38; Muchmore, 1991: 113; Harvey, 1999: [28°22’ N, 118°53’ E], alt. 868 m, 4.VII.2013, 247; Edward & Harvey, 2008: 280; Hu & Zhang, Fubin Zhang leg. Paratypes: four males (Ps.- 2011: 223–232; Hu & Zhang, 2012: 21–25. MHBU-ZJ13070402–05) and five females (Ps.- 172 Zhang & Zhang • ENTOMOL. FENNICA Vol. 25 Fig. 2. Lagynochtho- nius brachydigitatus sp. n. holotype male (a–f, h–j), female (g). – a. Carapace, dorsal view. – b. Left chelicera, dor- sal view. – c. Right chela, lateral view. – d. Right palp (minus chela), dorsal view. – e. Coxal spines on leg II. – f. Rallum. – g. Right chela, lateral view. – h. Right chela, dorsal view. – i. Left leg I, lat- eral view. – j. Left leg IV, lateral view. Scale bars: 0.04 mm (e), 0.1 mm (f), 0.15 mm (b), 0.25 mm (a, c, d, g–i), 0.5 mm (j). MHBU-ZJ13070406–10), same data as for holo- broad; male chela 5.82–6.20 (female 4.88–5.00) type. times longer than broad; male movable finger Diagnosis. Lagynochthonius brachydigitatus 1.03 (female 0.97–1.00) times longer than hand. is characterized by the following combination of Description. Male. Colouration: Carapace, characters: medium sized (body length male abdomen, pedipalpal femur and legs moderately 1.16–1.26 mm, female 1.58–1.59 mm); carapace olive-brown, other parts yellowish (Fig. 1a). without epistome; anterior pair of eyes well de- Carapace (Figs. 2a, 3b): Subquadrate, some- veloped, posterior pair of eyes reduced to what longer than broad, constricted posteriorly; eyespots; chelal fingers without intercalary teeth; nearly smooth, but anterior margin denticulate, eb-esb-ist nearly in straight line; male pedipalpal posterior part with squamous sculpturing; ante- femur 5.75 (female 5.50–6.00) times longer than rior pair of eyes well developed, the posterior ENTOMOL. FENNICA Vol. 25 • Two new species of pseudoscorpions from China 173 Fig. 3. Lagynochtho- nius brachydigitatus sp. n. holotype male (a–d, f, g), female (d). – a. Right chela, lateral view. – b. Carapace, dorsal view. – c. Left chelicera, dorsal view. – d. Genital area of male. – e. Genital area of female. – f. Left leg I, lateral view. – g. Left leg IV, lateral view. ones rudimentary, merely lighter spots; eyes al- slightly shorter. Intercoxal tubercle absent; coxa I most one diameter from each other, anterior pair with a short, lateral, finger-like projection; coxa II of eyes 1/2 diameter from the anterior margin of with 8 distally incised spines arranged in oblique the carapace; epistome absent, space between row (Fig. 2e); setae P 5, I 3, II 3–4, III 5, IV 5. median setae weakly depressed; carapacal Chelicera (Figs. 2b, 3c): Distinctly shorter chaetotaxy: m4m–2 (18), including 16 long setae than carapace; hand with 5 setae, bs short, galeal and 2 preocular microsetae. seta located in middle of movable finger; hand Coxal area: Of usual facies; manducatory pro- with tiny granulation laterally. Fixed finger with cess with 2 distal setae, one long and the other 8–10 conspicuous teeth, the apical one large and 174 Zhang & Zhang • ENTOMOL. FENNICA Vol. 25 others small; movable finger with 9–11 acute, 6: 6: 6: 4: T2T: 0; anterior genital operculum with conspicuous teeth; one lyrifissure at base of fixed 10 setae and 12 setae along posterior margin, 22 finger; spinneret flattened and broad, larger and in total; sternal chaetotaxy III–XII: 12–13: 11: 11: more distinct in female than in male. Serrula exte- 11: 11: 11–12: 9: 10: -: 2. rior with 15 lamellae; serrula interior with 10 Measurements (length/breadth or, for legs, lamellae. Rallum composed of 8 blades, distal length/depth in mm, ratios in parentheses). Male blade recumbent basally, with fine barbules and (holotype and paratype). Body length 1.16–1.26. set apart from others, latter tightly grouped and Carapace 0.32–0.35×0.31–0.34 (1.03). Chelicera with long pinnae, some of which are divided, the 0.29×0.15 (1.93), movable finger length 0.16. basal one shorter than the others (Fig. 2f). Palpal trochanter 0.14–0.15×0.08 (1.75–1.88), Pedipalp (Figs. 2c, 2h, 3a): Palpal femur setal femur 0.46×0.08 (5.75), patella 0.17–0.18×0.08 formula 5–5–1–3–4–0; chelal hand elongate and (2.13–2.25), chela 0.62–0.64×0.10–0.11 (5.82– constricted distally, dorsal surface of hand with a 6.20), hand 0.30–0.31×0.10–0.11 (2.73–2.82), single row of 4 chemosensory setae between movable finger length 0.31–0.32 (1.03×hand). trichobothria esb and ib/isb; a short spine-like Leg I trochanter 0.10×0.08 (1.25), femur seta near the base of fixed finger. Fixed finger 0.25×0.05–0.06 (4.17–5.00), patella 0.14×0.05 with 15 well-spaced pointed teeth, without inter- (2.80), tibia 0.12–0.14×0.04 (3.00–3.50), tarsus calary teeth; movable finger with 8–9 well- 0.28–0.29×0.03 (9.33–9.67); leg IV trochanter spaced pointed teeth (reaching midway between 0.14×0.09–0.10 (1.40–1.56), femur+patella b and sb), without intercalary teeth; fixed finger 0.42–0.44×0.17–0.18 (2.33–2.59), tibia with a modified accessory tooth on dorso- 0.28×0.06–0.07 (4.00–4.67), basitarsus antiaxial face (Fig.