Zarcosia lemairei Gompel 2020, n. sp.
Creators: name: Gompel, Nicolas
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Aderidae
Zarcosia
Zarcosia lemairei

description: <i>Zarcosia lemairei</i> n. sp. (Figures 1; 3a,b; 4i; 5 a–d; 6a) <b>Etymology.</b> The species is named after Jean-Michel Lemaire, who sent me the first specimens of this species, thereby seeding the present synopsis. <b>Type locality.</b> Laos: Khammouan province, Boualapha, Tham Nam Ock [17°35’ N 105°50’ E]. <b>Distribution.</b> Laos, Myanmar, Vietnam (Figure 1). <b>Description.</b> (Figure 3 a–b). Body length. &amp;male;: 3.70± 0.28 mm (n=6); &amp;female;: 3.98± 0.29 mm (n=12). Entirely black, slender, with long appendages. Body shape reminiscent of strict cave beetles (Carabidae: Trechini or Leiodidae: Leptodirini). Pubescence dense, very short, almost pulverulent, composed of stout bristles arising from the punctation, interspersed with very short whitish hairs, arising from the entire body surface, and giving a mat appearance to the insect. <i>Head</i> (Figure 5 a–c). As wide as pronotum in dorsal view. Eyes bigger in males than in females. Palpi black, last article securiform, as broad as the length of the first two antennomeres together. Frons deeply carved in males, flat in females. The deep pit on the male forehead differs in shape from that of <i>Zarcosia palliditarsis</i> (Pic, 1912) (Figure 5 e–g) and possesses a long and wavy tuft of silky yellow bristles, borne from the bottom of the head pit. <i>Antennae</i>. Filiform, 20% longer than elytra in males, hardly longer than elytra in females. <i>Pronotum</i>. Slightly longer than wide. Sides convergent in their anterior third, otherwise roughly parallel to each other, with a slight sinuosity or constriction. The dorsal surface is regularly rounded, with an anterior gibbosity. Combined, the anterior gibbosity and the slight posterior constriction place the largest width of the pronotum in its anterior third. Base of the pronotum with two sinuosities: one at the level of the midline and two flanking this first one, on each side. Sexual dimorphism: in males, the dorsal surface is posteriorly impressed by ill-defined foveola that singles out a carena-like bulge along the midline. <i>Elytra</i>. &amp;male;: 2.61± 0.18 mm (n=6); &amp;female;: 2.71± 0.21 mm (n=12). 2.3 longer than wide in both sexes, with sides slightly but regularly curved in females, straight, convergent in their posterior half in males. Dorsal surface moderately convex. <i>Legs</i>. Black, except the second half of the penultimate and the last tarsal segment that are orange in both sexes. Surface of femora micro-reticulated. Sexual dimorphism: (i) Tibias of forelegs and hindlegs slightly thickened and sinuated in males, flattened on their inner face; (ii) first tarsal segments of mesothoracic legs thickened in males (Figure 5d, left); (iii) hindtarsae extraordinarily elongated in males, in particular the last segment, which is 50–70% the length of the first tarsal segment (Figure 5d, right). By contrast, in females, the last segment of the hindtarsae is 40% the length of the first tarsal segment. <i>Aedeagus</i>. Figure 4i. Slender, narrow, sides weakly convergent in dorsal view. Slight curvature in lateral view, with apex sharply bent upward. <b>Type material.</b> Holotype (&amp;male;, MNHN). <b>Laos</b>: Khammouan province, Boualapha, Tham Nam Ock, Cave, Hin Nam No Project, 17°35’ N 105°50’ E (270 m) (H. Steiner) 3.III.2016. Paratypes. <b>Laos</b>: Ban Du, Tham Pha Houm, cave, 17°33’ N 105°49’ E (170 m) (J. Lips) 1.III.2016 (2 &amp;male; paratypes, NGPC; 3 &amp;female; paratypes, JMLC); Nong Ping, Tham Pha Pong, cave, 17°21’ N 105°54’ E (226 m) (J. Lips) 25.II.2016 (1 &amp;female; paratype, JMLC); Vientiane Province, Vang Vieng, Tham Ling Kham, Cave, 18°56’ N 102°26’ E, by hand (L. Johansson) 18.II.2004 (1 &amp;female; paratype, MNHN); Vientiane, Tham Paka, 19°01’ N 101°53’ E, cave (M. Ferrand) 5.III.2016 (1 &amp;male; and 1 &amp;female; paratypes, JMLC); Khammouan province, Boualapha, Tham Nam Ock, Cave, Hin Nam No Project, 17°35’ N 105°50’ E (270 m) (H. Steiner) 3.III.2016 (1 &amp;female; paratype, NGPC); Khammouan province, Boualapha, Tham Xe Bangfai, cave, Hin Nam No Project, 17°22’ N 105°50’ E (270 m) (H. Steiner) 22.II.2016 (1 &amp;female; paratype, NGPC); <b>Myanmar</b>: Shan State, Mondawa Gu, cave, 22°12’ N 95°52’ E, by hand (F. Brehier) 1.XII.2015 (1 &amp;female; paratype, MNHN); <b>Vietnam</b>: Hà Nam Ninh Province, Cúc Phuong, Water Fairy cave, 20°18’ N 105°36’ E, by hand (L. Deharveng) 11.X.1998 (1 &amp;female; paratype, NGPC); Bắc Kạn Province, Ba B ể District, Hoàng Tr&amp;itilde;, Nà sai, Tham Phay Cave, 22°19’ N 105°38’ E (490 m) (A. Faille) 22.X.2018 (1 &amp;male; paratype, SMNS; 1 &amp;male; paratype, NGPC); Quang Binh, Cha Noi, Hang Cha Noi, 17°38’ N 106°06’ E (260 m), by hand, (L. Deharveng and A. Bedos) 8.I.1995 (1 &amp;female; paratype, MNHN); Quang Binh, Dong Hoi, Grotte de Troc, 17°39’ N 106°14’ E (70 m), by hand (L. Deharveng and A. Bedos) 15.III.1997 (1 &amp;female; paratype, MNHN).
description: Published as part of <i>Gompel, Nicolas, 2020, Synopsis of the Asian species in the genus Zarcosia Collado &amp; Alonso-Zarazaga 1996 with new combinations and descriptions of fourteen new species, pp. 151-178 in Zootaxa 4838 (2)</i> on pages 163-164, DOI: 10.11646/zootaxa.4838.2.1, http://zenodo.org/record/4403783