Shravana zhui Gao & Zhang, 2024

Gao, Zhizhong, Zhang, Kaiquan & Zhang, Feng, 2024, First report of the family Ideoroncidae (Arachnida, Pseudoscorpiones) from China, with description of a new species, Biodiversity Data Journal 12, pp. 117319-117319 : 117319

Shravana zhui Gao & Zhang sp. nov.

Materials

Type status: Holotype. Occurrence: individualCount: 1; sex: male; lifeStage: adults; occurrenceID: D99B349E-2A03-5F69-856D-E3B8D8039759; Taxon : scientificName: Shravana zhui; family: Ideoroncidae ; Location : country: China; stateProvince: Xizang Autonomous Region ; county: Lang County; locality: Dongga Town ; verbatimElevation: 3062 m; verbatimLatitude: 29°05.053′N; verbatimLongitude: 93°08.995′E; Event : year: 2014; month: 8; day: 11; Record Level : institutionID: the Museum of Hebei University ; institutionCode: MHBU; collectionCode: Ps.-MHBU- XZ 14081101 Type status: Paratype. Occurrence: individualCount: 1; sex: female; lifeStage: adult; occurrenceID: D87124B9-C664-52E6-B0AE-B38AE570E2B1; Taxon : scientificName: Shravana zhui; family: Ideoroncidae ; Location : country: China; stateProvince: Xizang Autonomous Region ; county: Lang County; locality: Dongga Town ; verbatimElevation: 3062 m; verbatimLatitude: 29°05.053′N; verbatimLongitude: 93°08.995′E; Event : year: 2014; month: 8; day: 11; Record Level : institutionID: the Museum of Hebei University ; institutionCode: MHBU; collectionCode: Ps.-MHBU- XZ 14081102

Description

Adult male. Carapace and tergites dark brown, chelicerae, pedipalps and legs yellowish-brown (Fig. 1 a). Colour of females lighter than males.

Setae: generally long, straight or slightly curved and acicular.

Cephalothorax (Figs 2 , 4 ). Carapace (Fig. 2 a, Fig. 4 a) distinctly longer than broad (1.50 times); 2 bulging eyes; surface of carapace broadly reticulate; blunt rounded epistome present on anterior margin; 34 setae on the carapace, include 4 setae near anterior and 6 near posterior margin, with shallow posterior furrow (same in the females); four lyrifissures present (marked as dotted lines). Coxal region (Fig. 3 a). Manducatory process with 2 long apical setae, chelal coxa with 6-8 setae (1 tactile seta), chaetotaxy of coxa I 7, II 5, III 7, IV 6. Chelicera (Fig. 2 b, Fig. 4 b) palm with 6 simple setae; fixed finger with about 5 small teeth, movable finger with 6 erect and pointed teeth; galea (Fig. 4d) simple, smooth, long and straight; serrula exterior with 18-19 blades, serrula interior with 14-16 blades, thin lamina exterior present. Rallum (Fig. 4 c) in a row and composed of 4 anteriorly dentate blades. Pedipalps (Fig. 2 c-d, Fig. 4 e-f): Trochanter, femur and patella medially coarsely granulate (Fig. 2 c), hand medio-distally finely granulate; trochanter with a small round dorsal hump, 2.11 times longer than broad, femur 4.73 times longer than broad, patella 4.05 times longer than broad, fixed finger with 38-44 acute teeth (females with 39-42), which, in the middle, smaller than that in both ends; movable finger with 36-42 irregular acute teeth (females with 37-40); 31 trichobothria (21+10), 3 on prolateral hand face. Venom apparatus present in both chelal fingers, venom duct long, see Fig. 4 e. Opisthosoma. Abdomen Ovate; tergites and sternites undivided and uniseriate, all setae acuminate; tergites brown-yellowish, sternites yellowish; tergal chaetotaxy: 4: 6: 8: 9: 9: 8: 10: 9: 9: 8: 5, including 2 tactile setae on the last tergites; white spot on each lateral side of sternites V-IX, sternal chaetotaxy (IV-XI): 10: 11: 10: 12: 10: 10: 10: 7, including 2 tactile setae on the last sternites; anterior genital operculum with a median and posterior group of 10-12 setae (Fig. 3 b); posterior genital sternite with 16-17 setae (Fig. 3 b); pleural membrane finely striate. Legs. Leg I (Fig. 2 e, Fig. 3 c, Fig. 4 g) slender, trochanter, femur and patella medially coarsely granulate. Leg IV (Fig. 3 d, Fig. 4 h) stout, with one tactile seta present on basitarsus (TS = 0.21), subterminal tarsal seta apically trifurcate, arolium undivided, without ventral hooked process, slightly longer than the smooth and simple claws (Fig. 2 e, Fig. 4 i). Measurements (length/breadth or depth in mm, ratios in parentheses). Male (holotype). Body length 2.53. Carapace 0.87 × 0.58 (1.50). Palpal trochanter 0.40 × 0.19 (2.11), femur 1.04 × 0.22 (4.73), patella 0.89 × 0.22 (4.05), chela (with pedicel) 1.67/0.40, chela (without pedicel) 1.58/0.40, hand length (with pedicel) 0.77, hand length (without pedicel) 0.67, movable finger length 0.96. Leg I trochanter 0.22 × 0.16 (1.38), femur 0.51 × 0.11 (4.64), patella 0.26 × 0.11 (2.36), tibia 0.41 × 0.08 (5.13), basitarsus 0.25/0.06 (4.17), telotarsus 0.32/0.05 (6.40). Leg IV trochanter 0.30 × 0.16 (1.88), femur+patella 0.79 × 0.27 (2.93), tibia 0.56 × 0.12 (4.67), basitarsus 0.31/0.09 (3.44), telotarsus 0.42/0.06 (7.00). Measurements (female paratype). Mostly same as holotype (Fig. 1 b), body length 2.67. Carapace 0.88 × 0.61 (1.44). Palpal trochanter 0.38 × 0.19 (2.00), femur 1.08 × 0.23 (4.70), patella 0.92 × 0.22 (4.18), chela (with pedicel) 1.67 × 0.40 (4.18), chela (without pedicel) 1.58 × 0.40 (3.95), hand length (with pedicel) 0.81, hand length (without pedicel) 0.70, movable finger length 1.04. Leg I trochanter 0.24 × 0.16 (1.50), femur 0.52 × 0.12 (4.33), patella 0.27 × 0.12 (2.25), tibia 0.42 × 0.07 (6.00), basitarsus 0.28/0.06 (4.67), telotarsus 0.36/0.05 (7.20); leg IV trochanter 0.32 × 0.18 (1.78), femur+patella 0.80 × 0.26 (3.08), tibia 0.56 × 0.12 (4.67), basitarsus 0.36/0.09 (4.00), telotarsus 0.45/0.06 (7.50).

Comparison

The new species share the character of presence of only two trichobothria in the b region with S. pohli (Mahnert, 2007) and S. socotraensis (Mahnert, 2007); it differs from them by the presence of 21 trichobothria on the fixed chelal finger and hand, whereas S. pohli has 23-24, S. socotraensis has only 20 trichobothria ( Mahnert 2007, Harvey 2016)

Diagnosis

For the diagnosis for the genus Shravana , see Harvey (2016). This new species differs from all the other members of the genus Shravana by the following combination of characteristics: thin lamina exterior present, arolia without a ventral hook and slightly longer than the claws; 21 trichobothria on chelal fixed fingers, 10 on movable fingers, two trichobothria in the b region of the chela; tergites and sternites undivided, white spot on each lateral side of sternites V-IX; the presence of 34 setae on the carapace, include four near anterior margin, six near the posterior margin, with shallow posterior furrow; slender chela (femur 4.73 times, patella 4.05 times longer than broad); cheliceral palm with six simple setae.

Etymology

This species is named in memory of Prof. Mingsheng Zhu (1950-2010), a famous arachnologist from China, who made a great contribution to the study of Chinese arachnology.

Distribution

The new species is known only from Xizang Autonomous Region, China.

Notes

Shravana zhui sp. nov. is the first member of the family Ideoroncidae to be discovered in China, which expanded the distribution range of this family in Asia; two specimens were collected on the wet inner side under stones at a relatively higher elevation (3062 m).

Figures

Figure 1. Shravana zhui sp. nov., a. holotype, dorsal view; b. female paratype, dorsal view.

Figure 2. Shravana zhui sp. nov., holotype: a carapace, dorsal view; b chelicera, dorsal view; c pedipalp, dorsal view; d chelal fingers, prolateral view; e tarsus of leg IV, lateral view.

Figure 3. Shravana zhui sp. nov., holotype: a coxae, ventral view; b genital area, ventral view; c Leg I, lateral view; d Leg IV, lateral view.

Figure 4. Shravana zhui sp. nov., holotype: a carapace (dorsal view); b left chelicera (dorsal view); c rallum; d galea; e chelal fingers (prolateral view); f left palp (minus chela, dorsal view); g leg I (lateral view); h leg IV; i tarsus IV (lateral view). Scale bars: 0.10 mm (b-d); 0.50 mm (a, e-h).