Coillina baka Yin & Peng, 1998

Suzuki, Yuya, Aung, Mu Mu & Ono, Hirotsugu, 2021, First record of Coillina baka Ying & Peng, 1998 (Araneae: Gnaphosidae) from Myanmar, with a description of the previously unknown female, Zootaxa 4984 (1), pp. 274-280 : 275-278

Coillina baka Yin & Peng, 1998

Tables 1‒4 , Figs 1‒21

Coillina baka Yin & Peng 1998: 266 , figs 17‒25 (holotype male from Baka Village , Menglun Township , 20º30’N, 100º30’E, presumably 600‒700 m elevation, in Mengla County, Xishuangbanna , southwestern Yunnan Province, China, preserved in the Department of Biology , Hunan Normal University , Changsha, not examined).

Coillina baka: Song et al. 2004: 44 , fig. 22 (redescription of the holotype).

Material examined. MYANMAR: Chin State: 1male, 1 female, Mindat District, base of the Natma Taung National Park, Mindat Township , Eastside of Mindat town, 21º19’‒ 21º47N, 93º24’‒ 94º29’E, 1,200‒1,250 m elevation, H. Ono leg. 28.11.2017 (BRC, provisionally preserved in NMNS) .

Description (based on the specimens from Myanmar): Female. Measurements: Body length 8.07, carapace length 3.56, width 2.62, opisthosoma length 4.36, width 2.49, legs as in Table 1 . Size of eyes and their distances: AME 0.20, ALE 0.18, PME 0.18, PLE 0.16, AME‒AME 0.10, AME‒ALE 0.03, PME‒PME 0.09, PME‒PLE 0.16.

Carapace yellowish brown, hirsute, longer than wide, with a distinct fovea ( Fig. 1 ), anterior eye row recurved, posterior eye row procurved ( Fig. 3 ). Chelicerae reddish brown, promargin of fang furrow with three teeth and two denticles, retromargin with three teeth ( Figs 5 , 14 ), maxillae, labium and sternum yellowish brown, legs yellowish brown without annulations. Leg formula, 4123. Spination of legs as in Table 3 . Opisthosoma light grey with anterior dorsum light yellowish brown, without any marking ( Fig. 1 ). Anterior lateral spinnerets with eight cylindrical spigots ( Figs 7 , 16 ).

Epigyne ( Figs 9‒10 , 18–19 ). Epigynal plate longer than wide, lacking scape, with small slit-like copulatory openings located on the anterior part of the genital plate; a sac-like structure (bursa copulatrix?) attached to the entrance of each insemination duct, insemination ducts long and spiraled, occupying most part of vulva; receptacles rather small, globular and sclerotized, situated posteriorly.

Male. Measurements: Body length 5.03, carapace length 2.66, width 1.94, opisthosoma length 2.49, width 1.78, legs as in Table 2. Size of eyes and their distances: AME 0.15, ALE 0.12, PME 0.15, PLE 0.13, AME‒AME 0.08, AME‒ALE 0.03, PME‒PME 0.07, PME‒PLE 0.09.

The condition and the coloration of prosoma and opisthosoma ( Fig. 2 ), arrangement of eyes ( Fig. 4 ), dentation of chelicera ( Figs 6 , 15 ) and leg formula are almost same as those in the female. Spination of legs as in Table 4. There is a slight difference in the number of spines on the leg I between the holotype ( Yin & Peng 1998) and the present male. A distinct dorsal scutum present on the abdomen. Anterior lateral spinnerets with seven spigots ( Figs 8 , 17 ). Although the number of spigots on posterior lateral spinnerets of the male is not identical with that of the holotype of this species, we regard that the discrepancy does not represent a species difference nor variation because the material is not enough for such decision.

Male palp ( Figs 11‒13 , 20–21 ): Femur with a rounded, thumb-shaped apophysis ventrally ( Figs 11 : arrow, 20), a strong denticle (probably a short spine) prolaterally ( Figs 12 : arrow, 21) and two dorsal spines; tibia short with dorsal edge somewhat sclerotized, but lacking distinct apophysis; retrolateral edge of cymbium sclerotized with a basal projection; palpal bulb lacking median apophysis and conductor, embolic base without apophyses and spines, embolus long and coiled, its distal part filiform and extending into alveolus of cymbium.

Distribution. Myanmar (Chin State) and China (Yunnan Province).

Figures

FIGURES 1‒8. Coillina baka Yin & Peng, 1998 from Chin State, Myanmar (1, 3, 5, 7 female; 2, 4, 6, 8 male). 1–2 Habitus, dorsal. 3–4 Eye region, dorsal. 5–6 Chelicera, ventral. 7–8 Spigots on anterior lateral spinneret.

FIGURES 9‒13. Coillina baka Yin & Peng, 1998 from Chin State, Myanmar (9–10 female, 11–13 male). 9 Epigyne, ventral. 10 Vulva, dorsal. 11–13 Left palp (11 ventral, with arrow indicating thumb-shaped, ventral apophysis; 12 dorsal, with arrow indicating prolateral denticle; 13 retrolateral).Abbreviations: Co—copulatory opening; Cy—cymbium; E—embolus; Eb—embolus base; Fd—fertilization duct; Id—insemination duct; Re—receptacle.

FIGURES 14–21. Coillina baka Yin & Peng, 1998 from Chin State, Myanmar (14, 16, 18–19 female; 15, 17, 20–21male). 14–15 Cheliceral furrow with pro- and retromarginal teeth. 16–17 Spigots on anterior lateral spinneret. 18 Epigyne, ventral. 19 Vulva, dorsal. 20 Thumb-shaped apophysis on male palpal femur, ventral. 21 Denticle on male palpal femur, dorsal. Abbreviations. Co—copulatory opening; Fd—fertilization duct; Id—insemination duct; Re—receptacle.