Bassaniana birudis, Im & Kim & Lee, 2021

Im, Jae Seong, Kim, Seung Tae & Lee, Sue Yeon, 2021, Bassaniana birudis sp. nov., a new crab spider (Araneae, Thomisidae) from South Korea, Biodiversity Data Journal 9, pp. 73109-73109 : 73109

Bassaniana birudis sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Jae Seong Im and Seung Tae Kim ; individualCount: 1; sex: male; lifeStage: adult; Taxon : phylum: Arthropoda ; class: Arachnida ; order: Araneae ; family: Thomisidae ; Location : continent: Asia ; country: South Korea; countryCode: KR; stateProvince: Gyeongsangbuk-do; municipality: Gumi-si ; locality: Gupo-dong ; decimalLatitude: 36.128139; decimalLongitude: 128.396056; Identification : identifiedBy: Seung Tae Kim ; Event : samplingProtocol: sweep net; eventDate: Jun-25-2020; habitat: mixed forest; Record Level: institutionID: Nakdonggang National institute of Biological Resources (NNIBR) Type status: Paratype. Occurrence: recordedBy: Sue Yeon Lee and Seung Tae Kim ; individualCount: 1; sex: male; lifeStage: adult; Taxon : phylum: Arthropoda ; class: Arachnida ; order: Araneae ; family: Thomisidae ; Location : continent: Asia ; country: South Korea; countryCode: KR; stateProvince: Gyeongsangbuk-do; municipality: Gumi-si ; locality: Gupo-dong ; decimalLatitude: 36.128139; decimalLongitude: 128.396056; Identification : identifiedBy: Seung Tae Kim ; Event : samplingProtocol: sweep net; eventDate: May-14-2020; habitat: mixed forest; Record Level: institutionID: Konkuk University (KKU)

Description

Holotype male. Total length 4.20 (habitus). Carapace: 2.15 long/2.20 wide, dark reddish-brown, round, slightly wider than long, clothed sparsely with serrated setae especially along the cervical furrow, cephalic region of prosoma flat with a pair of light stripes along the median line, numerous warts present, cervical and radial furrows distinct, dark longitudinal fovea slightly depressed (Fig. 2 A and, C-E). Eyes: ALE 0.10, AME 0.06, PLE 0.14, PME 0.06, ALE-AME 0.17, AME-AME 0.30, PLE-PME 0.37, PME-PME 0.31, ALE-PLE 0.30, AME-PME 0.37, AER 0.58, PER 0.59, all eyes on the eye tubercle and lateral eye tubercles conspicuously developed, eight eyes in two rows, AER almost straight and PER recurved from above, AER strongly procurved and PER slightly procurved from front, PER longer than AER (Fig. 2 E and, F). Chelicera; 0.62 long/0.35 wide, dark reddish-brown, light stripe and cross-shaped pattern on dorsal surface (Fig. 2 C), no cheliceral teeth, fang very short. Endite: 0.45 long/0.18 wide, dark reddish-brown. Labium: 0.28 long/ 0.25 wide, dark reddish-brown. Sternum: 1.00 long/0.98 wide, mottled with dark and light reddish-brown, subcordate, clothed sparsely with long blackish-brown setae, pointed anteromedial margin protrudent, posterior end round and not protrudent between the coxae of leg IV (Fig. 2 B). Legs: I 7.67 (2.40, 0.80, 1.67, 1.90, 0.90), II 6.84 (2.07, 0.80, 1.50, 1.65, 0.82), III 3.92 (0.87, 0.60, 0.85, 0.93, 0.67), IV 4.40 (1.00, 0.52, 0.90, 1.18, 0.80), ivory, stout and strongly developed, I and II mottled severely with dark reddish-brown, III and IV mottled weakly with dark reddish-brown (Fig. 2 A and, D), femur with ventral stripe (Fig. 2 B), femur I with two small rod-like proximal protuberances on prolateral surface (Fig. 2 G), leg formula I-II-IV-III. Abdomen: 2.10 long/2.03 wide, ivory, flat and mottled with blackish-brown, yellowish-brown and reddish-brown, trapezoidal, slightly longer than wide, a pair of dark reddish-brown triangular markings paramedianly, numerous round or irregular pits on dorsal surface, clothed densely with semi-transparent clavate and serrated setae (Fig. 2 A, C and, D; Fig. 3 E and, F). Palp: 2.57 (0.46, 0.41, 0.20, -, 0.70), bulb round and simple, left margin of tegulum slightly constricted, no tegulum apophysis, embolus thick with a pointed embolus tip straight rotating largely clockwise and close to the tegulum, thumb-like VTA large with a bent tip, thumb-like blunt RTA large (Fig. 3 A-D).

Female. Unknown.

Diagnosis

The male of the new species can be easily distinguished from congeners of this genus, except B. ora by the thumb-like blunt RTA without a terminal spur (Fig. 3 B and, C); versus thumb-like RTA with a spine-like terminal spur in B. baudueri (Simon, 1877) ( Breitling et al. 2016: 44, figs. 8-9), B. decorata (Karsch, 1879) ( Paik 1974: 120, figs. 5-6), B. floridana (Banks, 1896) ( Bowling and Sauer 1975: 188, f. 4), B. utahensis (Gertsch, 1932) ( Dondale and Redner 1978: 136, figs. 439 and, 441), and B. versicolor ( Dondale and Redner 1978: 139, figs. 443 and, 445). The male of the new species is most similar to B. ora in the shape of the palpal organ, but can be easily distinguished from the latter by the body appearance, the shape of VTA, tegulum, and embolus: males of B. birudis sp. nov. have no white patterns on the carapace and abdominal dorsum (Fig. 2 A), a thick thumb-like VTA (Fig. 3 C), a slightly constricted tegulum (Fig. 3 B), and an embolus close to the tegulum (Fig. 3 B), versus white marginal patterns on the carapace and abdominal dorsum, a slender finger-like VTA, a round tegulum, and an embolus separated from the tegulum in B. ora ( Seo 1992: 79, figs. 1-4).

Etymology

The species name is a combination of Latin prefix ‘bi-’ (meaning two) and noun ‘rudis’ (meaning small stick) referring to two small rod-like proximal protuberances on the prolateral surface of the femur I (Fig. 2 G).

Distribution

South Korea: Gumi-si, Gyeongsangbuk-do (Fig. 1 A).

Notes

Remarks

The species was collected with a sweep net between shrubs in a mixed forest of hilly terrain near the tributary of the Nakdonggang River. Currently, females have not been collected and are not known, and no ecological information is available for this species other than its habitat.

Figures

Figure 1. Distribution map and habitat. A. Distribution of three species of Bassaniana in South Korea; B, C. Habitat of Bassaniana birudis sp. nov.

Figure 2. Bassaniana birudis sp. nov., holotype male. A. Habitus in dorsal view; B. Ditto in ventral view; C. Ditto in frontal view; D. Ditto in lateral view; E. Eye area from above; F. Ditto from front; G. Femur; I. in prolateral view (arrow indicates two proximal protuberances). Scale bars in mm.

Figure 3. Bassaniana birudis sp. nov., holotype male. A. Palp in prolateral view; B. Ditto in ventral view; C. Ditto in retrolateral view; D. Ditto in dorsal view; E. Clavate seta; F. Serrated seta (E, embolus; RTA, retrolateral tibial apophysis; VTA, ventral tibial apophysis). Scale bars in mm.