Zarcosia ilonae, Gompel, 2020

Gompel, Nicolas, 2020, Synopsis of the Asian species in the genus Zarcosia Collado & Alonso-Zarazaga 1996 with new combinations and descriptions of fourteen new species, Zootaxa 4838 (2), pp. 151-178 : 161-162

Zarcosia ilonae n. sp.

( Figures 1 ; 3c ; 4g ; 5k ; 6b )

Etymology. The species is named after my wife, Ilona Grunwald, to acknowledge her patience and support of my work with insects.

Type locality. Thailand: Surat Thani Province, Phanom District, Tham Wararam , 08°52’ N 98°39’ E .

Distribution. Thailand ( Figure 1 ).

Description. ( Figure 3c ). Female unknown. Body length. ♂ holotype: 2.55 mm. Slender, orange-brown with darker head, covered with very short, pulverulent, white pubescence. Appendages pale.

Head. Moderately transverse, barely wider than pronotum. Palpi yellow, last article securiform. Finely and densely punctuated. Occiput lined with a fringe of dense and short white hairs posteriorly.

Antennae. 1.5 times longer than elytra, entirely yellowish, filiform with antenommeres 3–10 elongated.

Pronotum ( Figure 6b ). Convex, slightly longer than wide, sides regularly curved, wider, almost gibbose in its anterior third.

Elytra. Length: 1.80 mm. Punctation strong and dense, with larger points. Space between points slightly wider than the points themselves. Disc subconvex. Pubescence dense and short, comprised of very short hairs borne from the points and interspersed pulverulent hairs.

Legs. Particularly elongated. Foretibia weakly broadened in the middle of their inner side ( Figure 5k ).

Aedeagus ( Figure 4g ). Sturdy, lightly pigmented, sides divergent from base in dorsal view, then largely rounded near apex and ending in a broad stinger. Nearly flat in lateral view, with no kink. Lateral appendages thick and as long as the apical stinger.

Type material. Holotype (♂, MNHN). Thailand: Surat Thani Province, Phanom District, Tham Wararam, Cave , 08°52’ N 98°39’ E (250 m) (L. Deharveng and A. Bedos) 24.VII.1987.

Note. The extremely thin and elongated appendages of species likely represent adaptations to life in caves.

Figures

FIGURE 1. Distribution of Zarcosia species across South Asia. New taxa are indicated in boldface. For Z. lemairei n. sp., the broader geographical range is highlighted with a red area with a dotted line.

FIGURE 3. Habitus of new Zarcosia species. a, Z. lemairei n. sp., ♂ holotype, from Laos. b, Z. lemairei n. sp., ♀ paratype, from Laos. c, Z. ilonae n. sp., ♂ holotype, from Thailand. d, Z. gerstmeieri n. sp., ♂ holotype, from Vietnam. e, Z. weigeli n. sp., ♂ holotype, from China (Yunnan). f, Z. deharvengi n. sp., ♂ holotype, from Republic of Indonesia (Sumatra). g, Z. sumatrensis n. sp., ♂ holotype, from Republic of Indonesia (Sumatra). h, Z. sumatrensis n. sp., ♀ paratype, from Republic of Indonesia (Sumatra). i, Z. barclayi n. sp., ♂ holotype, from Malaysia. j, Z. barclayi n. sp., ♀ paratype, from Malaysia. k, Z. schawalleri n. sp., ♂ holotype, from Malaysia. l, Z. schawalleri n. sp., ♀ paratype, from Malaysia. m, Z. bedosae n. sp., ♂ holotype, from Laos. n, Z. sinuata n. sp., ♂ holotype, from Thailand. o, Z. sinuata n. sp., ♀ paratype, from Thailand. p, Z. spinifemur n. sp., ♂ holotype, from Sri Lanka. q, Z. dentatifemur (Pic, 1912), ♂ holotype, from Sri Lanka, after remounting (same specimen as in Fig. 2o). r, Z. srilankaensis n. sp., ♂ paratype, from Sri Lanka. s, Z. intermedia n. sp., ♂ paratype, from Sri Lanka. s, Z. brunnea n. sp., ♂ paratype, from Sri Lanka. Scale bars: 0.5 mm.

FIGURE 4. Aedeagus of selected Zarcosia species. a, Z. barclayi n. sp., holotype, from Malaysia, lateral and dorsal views. b, Z. bedosae n. sp., holotype, from Laos, lateral and dorsal views. c, Z. bipartita (Pic, 1901) from India, lateral view. d, Z. cephalica (Pic, 1901) from Republic of Indonesia, lateral view. e, Z. deharvengi n. sp., holotype, from Laos, lateral and dorsal views. f, Z. gerstmeieri n. sp., holotype, from Vietnam, lateral and dorsal views. g, Z. ilonae n. sp., holotype, from Thailand, lateral and dorsal views. h, Z. kempi (Blair, 1924), holotype, from India, lateral and dorsal views. i, Z. lemairei n. sp., holotype, from Laos, lateral and dorsal views. j, Z. obscuricornis (Pic, 1927) from Vietnam, lateral view. k, Z. palliditarsis (Pic, 1912) from Sri Lanka, lateral view. l, Z. picina (Fairmaire, 1893), lectotype, from Vietnam, lateral view. m, Z. rubrobasalis (Pic, 1921) (slight uncertainty on the identity of this specimen) from Singapore, lateral view. n, Z. schawalleri n. sp., holotype, from Malaysia, lateral and dorsal views. o, Z. sinuata n. sp., holotype, from Thailand, lateral and dorsal views. p, Z. sumatrensis n. sp., holotype, from Republic of Indonesia (Sumatra), lateral and dorsal views. q, Z. troglodytes (Champion, 1916), holotype, from Malaysia, lateral view. r, Z. weigeli n. sp., holotype, from China (Yunnan), lateral and dorsal views. s, Z. spinifemur n. sp., holotype, from Sri Lanka, lateral and dorsal views. t, Z. dentatifemur (Pic, 1912), holotype, from Sri Lanka, lateral and dorsal views. u, Z. srilankaensis n. sp., paratype, from Sri Lanka, lateral and dorsal views. v, Z. intermedia n. sp., paratype, from Sri Lanka, lateral and dorsal views. w, Z. brunnea n. sp., paratype, from Sri Lanka, lateral and dorsal views. Scale bars: 100 µm.

FIGURE 5. Morphological details of selected Zarcosia species. a–d, Z. lemairei n. sp., ♂ holotype, from Laos: head in lateral (a), frontal (b) and dorsal (c) views; mesothoracic (left) and metathoracic (right) tarsae (d). e–g, Z. palliditarsis (Pic, 1912), ♂, from Sri Lanka: head in lateral (e), frontal (f) and dorsal (g) views. h, Z. srilankaensis n. sp., ♂ paratype, from Sri Lanka: tuft of pubescence at elytral apex. i, Z. weigeli n. sp., ♂ holotype, from China (Yunnan): elytral pubescence on disc. j, Z. gerstmeieri n. sp., ♂ holotype, from Vietnam: elytral pubescence on disc. k–t: male forelegs of Z. ilonae n. sp., holotype, from Thailand (k); Z. deharvengi n. sp., holotype, from Republic of Indonesia (Sumatra) (l); Z. schawalleri n. sp., holotype, from Malaysia (m); Z. sinuata n. sp., holotype, from Thailand (n); Z. sumatrensis n. sp., holotype, from Republic of Indonesia (Sumatra) (o); Z. srilankaensis n. sp., paratype, from Sri Lanka (p); Z. intermedia n. sp., paratype, from Sri Lanka (q); Z. dentatifemur (Pic, 1912), holotype, from Sri Lanka (r); Z. brunnea n. sp., paratype, from Sri Lanka (s); Z. weigeli n. sp., holotype, from China (Yunnan) (t). u–x: male mesothoracic legs of Z. cephalica (Pic, 1901) from Republic of Indonesia (u); Z. gerstmeieri n. sp., holotype, from Vietnam (v); Z. dentatifemur (Pic, 1912), holotype, from Sri Lanka (w); Z. spinifemur n. sp., holotype, from Sri Lanka (x). Scale bars: 100 µm.

FIGURE 6. Thoraces of selected Zarcosia species in dorsal view. a, Z. lemairei n. sp., ♂ holotype, from Laos (left) and Z. lemairei n. sp., ♀ paratype, from Laos (right). b, Z. ilonae n. sp., ♂ holotype, from Thailand. c, Z. gerstmeieri n. sp., ♂ holotype, from Vietnam. d, Z. weigeli n. sp., ♂ holotype, from China (Yunnan). e, Z. deharvengi n. sp., ♂ holotype, from Republic of Indonesia (Sumatra). f, Z. sumatrensis n. sp., ♂ holotype, from Republic of Indonesia (Sumatra) (left) and Z. sumatrensis n. sp., ♀ paratype, from Republic of Indonesia (Sumatra) (right). g, Z. barclayi n. sp., ♂ holotype, from Malaysia (left) and Z. barclayi n. sp., ♀ paratype, from Malaysia (right). h, Z. schawalleri n. sp., ♂ holotype, from Malaysia (left) and Z. schawalleri n. sp., ♀ paratype, from Malaysia (right). i, Z. bedosae n. sp., ♂ holotype, from Laos. j, Z. sinuata n. sp., ♂ holotype, from Thailand (left) and Z. sinuata n. sp., ♀ paratype, from Thailand (right). k, Z. dentatifemur (Pic, 1912), holotype, from Sri Lanka. l, Z. intermedia n. sp., ♂ paratype, from Sri Lanka. m, Z. srilankaensis n. sp., ♂ paratype, from Sri Lanka. n, Z. spinifemur n. sp., ♂ holotype, from Sri Lanka. o, Z. brunnea n. sp., ♂ paratype, from Sri Lanka. Scale bars: 100 µm.