Latouchia rufa Zhang & Wang, 2021

Zhang, Shu-Yuan & Wang, Cheng-Bin, 2021, Two new species of the genus Latouchia Pocock, 1901 from southeast China (Araneae: Mygalomorphae: Halonoproctidae), Biodiversity Data Journal 9, pp. 72456-72456 : 72456

Latouchia rufa Zhang & Wang, 2021 sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Shu-Yuan Zhang; Ju Zhang ; Bo Su ; individualCount: 1; sex: male; Location : country: CHINA; stateProvince: Guangdong; verbatimLocality: Shenzhen City , Luohu District , Wutongshan National Park ; verbatimLatitude: 22.5838°N; verbatimLongitude: 114.2216°E; Event : year: 2018; month: 4; day: 6; Record Level : institutionCode: MYNU Type status: Paratype. Occurrence: recordedBy: Shu-Yuan Zhang; Ju Zhang ; Bo Su ; individualCount: 5; sex: 1 male, 4 females; Location : country: CHINA; stateProvince: Guangdong; verbatimLocality: Shenzhen City , Luohu District , Wutongshan National Park ; verbatimLatitude: 22.5838°N; verbatimLongitude: 114.2216°E; Event : year: 2018; month: 4; day: 6; Record Level : institutionCode: MYNU

Description

Male (Fig. 1 A and B). Holotype (Ar.-MYNU-GDSZ0001). Total length 17.56 (not including chelicerae), chelicerae 3.17 long. Carapace 9.51 long and 8.59 wide, reddish-brown in ethanol (slightly darker when alive); rim of carapace black and with slight ridge, with a small number of setae; fovea U-shaped, with smooth flabalate thickening posteriorly; caput slightly raised, with numerous transverse grooves between ocular tubercle and fovea. Eyes in two rows, the front row slightly procurved; eye sizes and interdistances: AME 0.28, ALE 0.49, PME 0.26, PLE 0.38, AME-AME 0.14, ALE-ALE 0.64, AME-ALE 0.21, PME-PME 0.50, PME-PLE 0.12, ALE-PLE 0.09. Chelicerae reddish-brown, slightly darker than carapace, rastellum formed by 6-8 stout spines on a tubercle; promargin with 6-7 teeth, retromargin with 6 teeth. Labium 1.35 long and 1.70 wide, without cuspules. Maxillae 2.81 long and 1.78 wide, with 17 cuspules each. Sternum 5.31 long and 5.10 wide, reddish-brown, with large sigilla centrally. Several spinules present on a slightly sclerotised area between carapace and coxae III-IV. Opisthosoma 8.06 long and 5.91 wide, dorsally covered with five pairs of black marks and some irregular dark spots. Leg measurements: leg I 29.48 (9.21, 4.69, 7.36, 5.96, 2.26), leg II 25.02 (8.14, 4.03, 5.70, 5.12, 2.03), leg III 25.11 (6.39, 4.04, 4.32, 6.99, 3.37), leg IV 32.10 (8.27, 4.22, 7.52, 8.10, 3.99). Scopulae present on tarsi I-II and distal metatarsi I-II. Spines on prolateral tibia I-II hooked, the tip of hooked spine almost all upwards.

Palp (Fig. 2 A-D). Embolus medially curved, with a retrolateral keel; terminal part of embolus with a hooked apophysis dorsally. Palpal tarsus with ca. 10 xiphoidal spines distally; tibia with numerous bristles ventrally, without spine.

Female (Fig. 1 C-E). One of paratypes (Ar.-MYNU-GDSZ0002). Total length 22.45 (not including chelicerae), chelicerae 4.78 long. Carapace 10.85 long and 9.00 wide, smooth, reddish-orange in ethanol (slightly darker when alive); fovea U-shaped; caput obviously raised. Eyes in two rows on tubercle; eye sizes and interdistances: AME 0.28, ALE 0.50, PME 0.22, PLE 0.49, AME-AME 0.21, ALE-ALE 0.73, AME-ALE 0.28, PME-PME 0.51, PME-PLE 0.12, ALE-PLE 0.11. Chelicerae robust, reddish-orange, promargin with 7 teeth, retromargin with 5-6 teeth; rastellum formed by 12 stout spines on a tubercle. Labium 1.47 long and 1.96 wide, without cuspules. Maxillae 3.70 long and 2.62 wide, with 16 cuspules each. Sternum 6.72 long and 6.08 wide, yellowish-orange, with large sigilla centrally. Several spinules present on a slightly sclerotised area between carapace and coxae III-IV. Opisthosoma 10.35 long and 7.29 wide, yellowish-brown, pattern as in male. Leg measurements: leg I 22.04 (7.38, 4.43, 4.54, 3.94, 1.75), leg II 18.29 (6.12, 3.59, 3.82, 3.00, 1.76), leg III 18.16 (5.44, 3.85, 2.68, 3.53, 2.66), leg IV 24.94 (7.74, 4.97, 4.88, 5.11, 2.24). Femora I-IV and patellae I-II without spines. Spines on palp, leg I and prolateral leg II almost all hooked.

Vulva (Fig. 3 ). Spermathecae suborbicular, with numerous glandular pores and an outer lateral protrusion; stalks short; basal plates present, slightly sclerotised.

Diagnosis

The male of this new species is similar to Latouchia formosensis Kayashima, 1943 in general appearance, but it is distinguishable from the latter by the medially-curved embolus and the absence of a spine band on retrolateral side of palpal tibia (Fig. 2 A-C) (vs. in L. formosensis , the embolus is relatively straight and median part is not curved; a band of short spines is present on retrolateral side of palpal tibia).

The new species also resembles Latouchia formosensis smithi Tso, Haupt & Zhu, 2003 in the shape of terminal embolus (Fig. 2 D) (both with a ridge proventrally) and in the arrangement of hooked spines on prolateral tibia II in males, but it can be distinguished from the latter by the following characters: in the lateral aspect of male palp, the width of the basal embolus is 2-3 times as wide as the tip (vs. in L. formosensis smithi , the basal embolus in the same aspect is 4-5 times as wide as the tip); in female, the spermathecae have an outer lateral protrusion.

Etymology

The specific name is Latin, means red, referring to the coloration of females. This adjective is in nominative case and feminine.

Distribution

China (Guangdong).

Field observations

Living male and female of this new species as shown in Fig. 4 .

Figures

Figure 1. Habitus of Latouchia rufa sp. n. A male holotype, dorsal view; B male holotype, ventral view; C female paratype, dorsal view; D female paratype, ventral view; E female paratype, lateral view.

Figure 2. Left male palp of Latouchia rufa sp. n., holotype. A retrolateral view; B ventral view; C prolateral view; D tip of embolus.

Figure 3. Vulva of Latouchia rufa sp. n., paratype, dorsal view. Arrows indicate basal plates.

Figure 4. Living Latouchia rufa sp. n. A male (holotype); B female (paratype).