Lechytia yulongensis Zhang & Zhang, 2014

Sun, Jianzhou, Guo, Xiangbo & Zhang, Feng, 2024, Revision of the genus Lechytia Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from China, with descriptions of two new species, Biodiversity Data Journal 12, pp. 122612-122612 : 122612

Lechytia yulongensis Zhang & Zhang, 2014

Materials

Type status: Holotype. Occurrence: recordedBy: Aki Nakamura; sex: male; lifeStage: adult; occurrenceID: 66480400-CA62-583D-9866-7EE1B3F3D068; Taxon : scientificName: Lechytia yulongensis; nameAccordingTo: Zhang, F.B and Zhang, F. 2014. First report of the family Lechytiidae (Arachnida: Pseudoscorpiones) from China, with the description of a new species. Acta Zoologica Academiae Scientiarum Hungaricae , 60(3):217-225.; Location : country: China; stateProvince: Yunnan Province; locality: Jade Dragon Snow Mountains , Maoniuping ; verbatimElevation: 3254 m; verbatimCoordinates: 27°08'N, 100°13'E; Event: year: 2012; month: August; day: 3; Record Level: institutionID: the Museum of Hebei University; institutionCode: Ps.-MHBU-YN 12080301 Type status: Paratype. Occurrence: recordedBy: Aki Nakamura; sex: male; lifeStage: adult; occurrenceID: 219D7E73-EF8A-5C45-BC3A-5BAABB6B44A6; Taxon : scientificName: Lechytia yulongensis; nameAccordingTo: Zhang, F.B and Zhang, F. 2014. First report of the family Lechytiidae (Arachnida: Pseudoscorpiones) from China, with the description of a new species. Acta Zoologica Academiae Scientiarum Hungaricae , 60(3):217-225.; Location : country: China; stateProvince: Yunnan Province; locality: Jade Dragon Snow Mountains , Maoniuping ; verbatimElevation: 3254 m; verbatimCoordinates: 27°08′N, 100°13′E; Event: year: 2012; month: August; day: 3; Record Level: institutionID: the Museum of Hebei University; institutionCode: Ps.-MHBU-YN 12080302 Type status: Other material. Occurrence: recordedBy: Aki Nakamura; sex: female; lifeStage: adult; occurrenceID: 3A5C40DA-C533-5F2F-A918-61DE00CFB309; Taxon : scientificName: Lechytia yulongensis; nameAccordingTo: Zhang, F.B and Zhang, F. 2014. First report of the family Lechytiidae (Arachnida: Pseudoscorpiones) from China, with the description of a new species. Acta Zoologica Academiae Scientiarum Hungaricae , 60(3):217-225.; Location : country: China; stateProvince: Yunnan Province; locality: Jade Dragon Snow Mountains ; verbatimElevation: 3240 m; verbatimCoordinates: 27.139°N, 100.229°E; Identification: identifiedBy: Jianzhou Sun; Event: year: 2012; month: August; habitat: conifer forest; Record Level: institutionID: the Museum of Hebei University; institutionCode: Ps.-MHBU-YN12080304

Description

Female (Fig. 13 A, Fig. 14 A-I, K and Figs 15 , 16 ).

Cephalothorax (Fig. 14 C, D, I and Fig. 15 A): carapace nearly subquadrate, 0.87 times longer than broad; anterior margin denticulate; without epistome; two small corneate eyes; with 18 setae arranged 6: 4: 4: 2: 2, most setae heavy, long and gently curved; with four pairs of lyrifissures, first pair situated antero-medially, the second pair situated interno-underneath to the eyes, the third pair situated slightly interior to the sole pair of setae of the intermediate row and the fourth pair situated exterior to the sole pair of setae of the posterior row. Manducatory process with two acuminate distal setae, about equal in length, the distal setae terminally acuminate; apex of coxa I with a triangular apical projection; coxal spines and intercoxal tubercle absent. Chaetotaxy of coxae: P 5, Ⅰ 6, II 6, III 7, IV 6.

Chelicera (Fig. 14 E and Fig. 15 B): 1.80 times longer than broad; five setae present on hand, all setae acuminate, ventrobasal setae shorter than others; movable finger with one medial seta. Cheliceral palm has moderate wrinkles on both ventral and dorsal sides. Fixed finger with one large tooth and two roughened ridges proximally; movable finger with an acute apical tooth and four pointed, conspicuous middle teeth; galea shaped like a tooth (♂♀). Serrula exterior with 17 blades. Rallum with eight blades, subdistal blade strongly recumbent, others in straight row (Fig. 15 C).

Pedipalp (Fig. 14 A, B, H, Fig. 15 D, Fig. 16 A and B): trochanter 1.64, femur 3.31, patella 1.60, chela 3.45, hand 1.45 times longer than broad; femur 1.79 times longer than patella; movable chelal finger 1.48 times longer than hand and 0.62 times longer than chela. Setae generally long and acuminate. Fixed chelal finger and hand with eight trichobothria, ib, isb, eb and esb on dorsum of hand, ib and isb basally, esb submedially, eb closer to ib and isb than to esb; ist situated basally on fixed finger, est and it situated sub-basally and submedially on fixed finger, et and dx distally; movable chelal finger with four trichobothria, b closer to sb than to t, sb closer b than to st; b and sb situated more than one areolar diameter apart (Fig. 14 A and Fig. 16 A); sensilla absent. Both chelal fingers with a row of teeth: fixed finger with 41 developed retrorse, pointed teeth; movable finger with 37 developed retrorse, pointed teeth.

Opisthosoma: tergites and sternites undivided; setae acuminate. Tergal chaetotaxy I-Ⅻ: 6: 6: 6: 6: 6: 6: 6: 6: 6: 4: T2T: 0. Sternal chaetotaxy Ⅱ-Ⅻ: 6: 12: 12: 12: 10: 10: 9: 9: 10: -: 2. Genital area weakly sclerotised with U-shaped frame (Fig. 14 K).

Legs (Fig. 14 F, G, Fig. 16 C and D): leg Ⅰ: femur 1.75 times longer than patella; tarsus 1.92 times longer than tibia. Leg Ⅳ: femoropatella 2.79 times longer than deep; tibia 3.00 times longer than deep; with sub-basal tactile setae on basitarsal segments. Arolium slightly shorter than the claws, not divided; claws simple.

Dimensions (length/breadth or, in the case of the legs, length/depth in mm; ratios in parentheses). Female: body length 1.59. Pedipalps: trochanter 0.18/0.11 (1.64), femur 0.43/0.13 (3.31), patella 0.24/0.15 (1.60), chela 0.69/0.20 (3.45), hand 0.29/0.20 (1.45), movable chelal finger length 0.43. Chelicera 0.27/0.15 (1.80), movable finger length 0.14. Carapace 0.39/0.45 (0.87). Leg I: trochanter 0.11/0.09 (1.22), femur 0.21/0.06 (3.50), patella 0.12/0.06 (2.00), tibia 0.13/0.05 (2.60), tarsus 0.25/0.04 (6.25). Leg Ⅳ: trochanter 0.16/0.12 (1.33), femoropatella 0.39/0.14 (2.79), tibia 0.24/0.08 (3.00), basitarsus 0.14/0.05 (2.80), telotarsus 0.25/0.03 (8.33).

Diagnosis

Revised diagnosis (♂♀). The species belongs to the Lechytia hoffi species-group and is characterised by the following combination of characteristics: trichobothria b and sb situated more than one areolar diameter apart; movable chelal finger with strongly retrorse, pointed teeth; chela 3.45 (♀), 3.55-3.59 (♂) and chelal hand 1.45 (♀), 1.56-1.59 (♂) longer than broad; chelal femur 0.43 mm (♀), 0.40 mm (♂), chelal hand 0.29 mm (♀), 0.27-0.28 mm (♂) and chelal movable finger 0.43 mm (♀), 0.37-0.38 mm (♂) long.

Lechytia yulongensis closest to L. acutidentata sp. nov. due to trichobothria b and sb on movable chelal finger situated more than one areolar diameter apart. However, the species differs from L. acutidentata sp. nov. in the pattern of teeth of fixed chelal finger with retrorse and point teeth in L. yulongensis , but upright and point teeth in L. acutidentata sp. nov ( Zhang and Zhang 2014).

Distribution

China (Yunnan Province).

Taxon discussion

Lechytia yulongensis was described and illustrated only from male specimens by Zhang and Zhang (2014). Although the original diagnosis contains the following character: trichobothria b and sb are only about one areolar diameter apart ( Zhang and Zhang 2014), we found that the distance between trichobothria b and sb is more than one areolar diameter after inspection of the holotype, as shown in the original photo and illustration ( Zhang and Zhang 2014: figs. 2C and 4A). In addition, we observed a triangular projection with a single hump on the apex of coxa I in the holotype of L. yulongensis (Fig. 14 J), rather than a two-humped projection as shown in the original illustration ( Zhang and Zhang 2014: 3A).

The female specimen was collected at the same place as the holotype, they have the same morphological characters, for example, the shape and number of chelal teeth and the positions of trichobothria. Therefore, we described the new specimen as female L. yulongensis . Based on the holotype and the new female specimen, we refined the diagnosis of L. yulongensis (see revised diagnosis) ( Zhang and Zhang 2014).

Figures

Figure 13. Lechytia yulongensis. Female (dorsal view). Scale bars: 0.50 mm.

Figure 14. Lechytia yulongensis, female (A-I, K), holotype male (J): A Left chela (lateral view); B Left chela (dorsal view); C Coxal area and manducatory process (ventral view); D Carapace (dorsal view); E Left chelicera (dorsal view); F Leg Ⅰ (lateral view); G Leg Ⅳ (lateral view); H Left pedipalp (minus chela, dorsal view); I Apex of coxa I (female); J Apex of coxa I (male); K Female genital area (ventral view). Scale bars: 0.20 mm (A, B, H); 0.10 mm (C-G, I-K).

Figure 15. Lechytia yulongensis, female: A Carapace (dorsal view); B Left chelicera (dorsal view), with details of teeth; C Rallum; D Left pedipalp (minus chela, dorsal view). Scale bars: 0.10 mm (A-B); 0.05 mm (C); 0.20 mm (D).

Figure 16. Lechytia yulongensis, female: A Left chela (lateral view), with details of teeth and trichobothrial pattern; B Left chela (dorsal view); C Leg I (lateral view); D Leg IV (lateral view). Scale bars: 0.20 mm (A, B); 0.10 mm (C, D).