Arctosa delaportei, Omelko & Marusik, 2022

Omelko, M. M. & Marusik, Y. M., 2022, First data on Arctosa wolf spiders (Araneae: Lycosidae) from Laos with description of a new species, Raffles Bulletin of Zoology 70, pp. 397-406 : 398

Arctosa delaportei , new species

( Figs. 1 , 7, 8 , 15–17 , 26 , 37 )

Material examined. Holotype: male ( ZMMU), LAOS, Vientiane Prov., env. Of Nam-Lik Eco-Village , 18°36′53.18″N 102°24′31.87″E, pitfall traps on edge of dry rice field, coll. M.M. Omelko, 9–12 June 2016 . Paratype: male ( FEFU), same place and collector, 4–9 June 2017 .

Etymology. The specific name is a patronym in honour of the French naval officer, artist, and explorer of Indochina, Louis Delaporte (11 January 1842 – 3 May 1925).

Diagnosis. By the general appearance (especially leg colouration) and palp structure, the new species is similar to A. tangguoi Wang et al., 2021 known from Hainan Island. It differs by 1) having poorly distinct white markings on the carapace (vs. distinct); 2) dorsal abdominal pattern poorly distinct (vs. distinct); 3) bulb height/cymbium tip length ratio 1.16 (vs. 1.3); 4) course of embolus (Em) is less steep in new species (ca. 20° vs. 30°); 5) tip of tegular apophysis (Tg) is abruptly sharp (vs. rounded); 5) embolus and terminal apophysis (Ta) not contiguous (vs. contiguous); 6) sperm duct (Sd) less curved in its middle part in the new species (103° vs. 83°).

Description. Male, holotype. Total length 4.62. Carapace 2.46 long, 1.65 wide. Abdomen 1.90 long, 1.23 wide. Carapace uniformly dark brown, lacking distinct pattern ( Fig. 1 ). Eye region black. Radial stripes poorly visible. Eye sizes and interdistances: AME 0.09, ALE 0.08, PME 0.20, PLE 0.14; AME–AME 0.06, AME–ALE 0.03, PME–PME 0.11, PME–PLE 0.14. Clypeus 0.03 high. Chelicerae brown. Number of cheliceral teeth as in Table 7. Labium dark brown, longer than wide. Endites light brown, longer than wide. Sternum brown, without pattern, with sparse brown setae.

Legs with contrasting colours. Coxae I–II light brown, III–IV yellow. Femur I dark brown with brown tips, II–IV black with yellow basal parts; patellae I–II light brown, III–IV dark brown; tibiae and metatarsi brown with yellowish annulation; tarsi brown. Length of leg segments as in Table 1. Spination of legs I and II as in Table 8.

Abdomen dorsally dark grey, with lanceolate cardiac mark in anterior half and whitish irregular markings in posterior half part. Venter of abdomen dark grey, with grey spinnerets. Lateral sides grey.

Male palp as in Figs. 7, 8 , 15–17 , 26 . Femur light brown. Tibia same colour, 1.7 times longer than wide (in ventral view), as long as bulb. Cymbium 2.1 times longer than wide, with 4 spines apically, tip almost as long as bulb. Bulbus oval, 1.25 times longer than wide; sperm duct with ca. 100° bent above subtegulum. Tegular apophysis (Tg) with only retrolateral arm (Ra). Retrolateral arm with abruptly sharp tip and deep groove (Ag) visible in retrolateral view ( Fig. 17 ). Terminal apophysis (Ta) short, slightly curved, with widened tip. Conductor (Co) wide, semi-transparent, membranous, poorly visible. Embolus (Em) wide and short, with rounded projection (Ep) near tip ( Fig. 26 ).

Distribution. Type locality only ( Fig. 37 ).

Figures

Figs. 1–6. General appearance of Arctosa delaportei, new species (1), A. depectinata (2, 3), A. kiangsiensis (4, 5), and A. springiosa (6). 1, 2, 4, 6, male; 3, 5, female. Scale = 1 mm.

Figs. 7–14. Male palps of Arctosa delaportei, new species (7, 8), A. depectinata (9, 10), A. kiangsiensis (11, 12), and A. springiosa (13, 14). 7, 9, 11, 13, ventral; 8, 10, 12, 14, retrolateral. Scale = 0.2 mm. Abbreviations: Pa – posterior arm, Ra – retrolateral arm.

Figs. 15–25. Bulbs of Arctosa delaportei, new species (15–17), A. kiangsiensis (18–21), and A. springiosa (22–25). 15, 18, 22, ventral; 16, 21, 25, anterior; 17, 20, 24, retrolateral; 19, 23, prolateral-anterior. Scale = 0.1 mm. Abbreviations: Aa1–3 – anterior arms 1–3, Ag – arm groove, Co – conductor, Ra – retrolateral arm, Sd – sperm duct, St – subtegulum, Ta – terminal apophysis, Te – tegulum, Tg – tegular apophysis, Tt – tegular apophysis teeth.

Figs. 26–30. Embolic divisions of Arctosa delaportei, new species (26), A. kiangsiensis (27, 28), and A. springiosa (29, 30). 26, 28, 30, anterior; 27, 29, ventral. Scale = 0.1 mm. Abbreviations: Em – embolus, Ep – embolus projection, Ta – terminal apophysis.

Fig. 37. Distribution records of Arctosa spp.: A. delaportei, new species (1), A. depectinata (2), A. kiangsiensis (3), and A. springiosa (4). New localities in Laos are outlined by red circles.