Langerra easoensis, Hoang, 2024

Langerra easoensis sp. nov.

Figs 1–11 View FIGURES 1–6 View FIGURES 7–11

Type material. Holotype: ♂ ( VNMN-ARA-SAL-560 ), VIETNAM: Dak Lak Province: Ea Kar District, Ea So Nature Reserve , 12.9883°N, 108.6742°E, 150 m, 18 February 2024, leg. Q. D. Hoang. GoogleMaps Paratypes: 3♂ ( VNMN-ARA-SAL-560.1-3 ), 3♀ ( VNMN-ARA-SAL-571.1-3 ), same data as for the holotype GoogleMaps .

Etymology. The specific name is derived from the type locality, Ea So Nature Reserve.

Diagnosis. The new species, Langerra easoensis sp. nov., closely resembles the type species, L. oculina Żabka, 1985 in having tibia with a wide ventro-prolateral membrane, cymbium with a retrolateral apophysis extending over tibia, and embolus with tooth-like projections; epigyne with wide and oval copulatory openings, and copulatory ducts running anteriorly. But it can be distinguished from the latter by the following characteristics: male’s palpal tibia with a dorsal apophysis distally ( Fig. 9 View FIGURES 7–11 ) (absent in L. oculina , see fig. 54 in Logunov 2021); retrolateral tibial apophysis long and wide at the end ( Figs 7–8 View FIGURES 7–11 ) compared to L. oculina (figs 52–53 in Logunov 2021); cymbium apophysis short and covering about ¼ of tibia length (long and covering more than half of tibia length in L. oculina , see figs 52–54 in Logunov 2021), embolus originating at 5 o’clock and accompanied ca. seven small tooth-like projections medially ( Fig. 7 View FIGURES 7–11 ) (at 3 o’clock and with two teeth near the base, see fig. 52 in Logunov 2021); female, epigyne with a large depression accompanying the copulatory openings, but without a transversal rim above the copulatory openings ( Fig. 10 View FIGURES 7–11 ; vs. flat and with a transversal rim in L. oculina , fig. 251 in Żabka 1985, and figs 57, 59 in Logunov 2021), anterior part of copulatory ducts almost straight and narrow ( Figs 10–11 View FIGURES 7–11 ; slightly wide and bent outward in L. oculina , figs 251–252 in Żabka 1985, and figs 57, 59 in Logunov 2021).

Description. Male (holotype, Figs 1, 3, 5 View FIGURES 1–6 , 7–9 View FIGURES 7–11 ): Measurements: Total length 4.51; Carapace length 2.33, width 2.22; Abdomen length 2.18, width 1.56. Carapace reddish brown, clothed with dense long dark setae, and two lateral bands of dense white setae; around eye region sparsely covered with orange setae, with a wide area of dense long white setae extends from PME to PLE. Anterior eyes surrounded by red orange orbital setae. Clypeus reddish brown, and densely covered by long white setae. Sternum yellowish brown, with a darker margin. Endites and labium dark brown, and lighter at tips. Chelicerae reddish brown, with some long white setae at the base; promargin with two teeth, and a wide fissidentate tooth on retromargin. Abdomen pale yellow, with three pairs of sigilla on the dorsum, and some dark markings, anterior part of the dorsum covered with long white setae. Posterior spinnerets dark brown, anterior yellow and light brown apically. All legs dark brown (except for all tarsi and metatarsi of legs III, IV yellowish), legs I robust and longest, legs IV shortest. Width of eye rows: anterior eye row 2.18; posterior medial eye row 1.86; posterior lateral eye row 1.97. Distance between ALE-PME 0.89; ALE-PLE 1.63. Diameter of eyes: AME 0.68; ALE 0.42; PME 0.14; PLE 0.37. Length of leg segments: I 2.29 + 1.35 + 2.04 + 1.43 + 0.55 (7.66); II 1.51 + 0.93 + 1.09 + 0.92 + 0.36 (4.97); III 1.81 + 0.86 + 0.98 + 1.16 + 0.38 (5.19); IV 1.46 + 0.67 + 0.93 + 1.25 + 0.44 (4.75). Leg formula I–III–II–IV. Leg spination: I: Fm d 1–1–2; Pt pr rt 1; Tb pr 1–1; v 2–2–2; Mt v 2–2. II: Fm d 1–1–3; Pt pr rt 1; Tb pr 1–1, v 2–2–2; Mt p 1–1; v 2–2. III: Fm d 1–1–3; pr 0–0–1; Pt pr rt 1; Tb pr rt 1–1; v 1–0; Mt d 0–0–2; pr rt 1–0–1; v 2–2. and IV: Fm d 1–1–2; Pt pr rt 1; Tb pr rt 1–1; Mt d 0–1–2; pr 1–1–1; rt 1–0–1.

Palp ( Figs 7–9 View FIGURES 7–11 ) yellowish brown; tibia longer than wide, with a wide ventro-prolateral membrane approximately half tibia length, and a blunt distal apophysis; retrolateral tibial apophysis slightly shorter than tibia, blunt, and wide tip in retrolateral view; cymbium with a long furrow extending nearly half its length retrolaterally, and a pointed triangular apophysis proximally with its tip directed outwards; bulbus almost rounded; embolus thin, with pointed tip and accompanied by ca. seven short tooth-like structures at the 9 o’clock position (arrowed in Fig. 7 View FIGURES 7–11 ).

Female ( Figs 2, 4, 6 View FIGURES 1–6 , 10–11 View FIGURES 7–11 ): Measurements: Total length 3.58; Carapace length 1.74, width 1.71; Abdomen length 1.84, width 1.55. Similar to the holotype, except for the following differences: carapace lighter, and without an area of dense long white setae behind the PME as seen the holotype; the sternum, endites, labium and chelicerae lighter than those of the holotype; legs reddish brown. Width of eye rows: anterior eye row 1.72; posterior medial eye row 1.46; posterior lateral eye row 1.57. Distance between ALE-PME 0.56; ALE-PLE 1.13. Diameter of eyes: AME 0.56; ALE 0.35; PME 0.09; PLE 0.33. Length of leg segments: I 1.37 + 0.81 + 1.02 + 0.68 + 0.39 (4.27); II 1.16 + 0.64 + 0.71 + 0.59 + 0.36 (3.46); III 1.42 + 0.63 + 0.72 + 0.88 + 0.32 (3.97); IV 1.19 + 0.52 + 0.75 + 0.93 + 0.32 (3.71). Leg formula I–III–IV–II. Leg spination: I: Fm d 0–0–2; Tb pr 1; v 2–2–2; Mt v 2–2. II: Fm d 1–1–3; Tb pr 1–1, v 2–2–2; Mt pr 1–1; v 2–2. III: Fm d 0–1–3; pr 0–0–1; Pt pr rt 1; Tb pr rt 1–1; v 1–0; Mt d 0–0–2; pr rt 1–0–1; v 2–2. and IV: Fm d 1–1–2; Pt rt 1; Tb pr rt 1–1; Mt d 0–1–2; pr 0–0–1; rt 0–0–1.

Epigyne ( Figs 10–11 View FIGURES 7–11 ) as long as wide, with a large depression containing the oblique, oval-shaped copulatory openings; copulatory ducts long, partially touching each other, anterior part almost straight, running anteriorly, the remaining coiled; spermathecae and copulatory ducts nearly uniform, spermathecae partially covered by copulatory ducts, base of spermathecae almost transverse, and fertilization ducts long and wide.

Distribution. Known only from the type locality.