Zarcosia sumatrensis, 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 : 174-175

Zarcosia sumatrensis n. sp.

( Figures 1 ; 3g,h ; 4p ; 5o ; 6f )

Etymology. The species’ name refers to its geographical origin.

Type locality. Republic of Indonesia: Sumatra, Goea Limau Moangkaer [04°14’ N 98°10’ E] .

Distribution. Republic of Indonesia: Sumatra ( Figure 1 ).

Description. ( Figure 3g,h ). Body length. ♂ holotype: 3.00 mm; ♀: 2.65± 0.19 mm (n=7). Dark brown, darker anteriorly, gracile, covered with very short, pulverulent pubescence. Appendages orange-brown.

Head. Small, dark, barely wider than pronotum. Palpi orange, last article securiform. Integument, finely and densely punctuated, lightly rugose. Occiput lined with a very fine fringe of dense and short silver hairs posteriorly.

Antennae. A third longer than elytra in ♂, as long as elytra in ♀, orange-brown, regularly filiform with antenommeres 3–10 cylindrical.

Pronotum ( Figure 6f ). Round and convex, slightly elongated in ♂, as long as wide in ♀. Sides regularly curved. Surface mat, finely and densely punctuated, covered with dense, pruinose double pubescence.

Elytra. Length: ♂ holotype: 2.00 mm; ♀: 1.95± 0.10 mm (n=7). Punctation fine and shallow, dense (space between points as wide as the points themselves). Disc depressed. Pubescence dense and short, whitish, comprised of short hairs borne from the points and interspersed pulverulent hairs.

Legs. Particularly elongated. Foretibia thickened in a smooth tooth on their inner side ( Figure 5o ). Mesothoracic legs not observed (a single male devoid of mesothoracic legs was present in the type series).

Aedeagus ( Figure 4p ). Sides subparallel in dorsal view, apex tapered in apical fifth, ending with a button. Strongly bent in lateral view, apex with a weak upward deflection. Appendages visible near apex.

Type material. Holotype (♂, BMNH). Republic of Indonesia: Sumatra, Goea Limau Moangkaer , 04°14’ N 98°10’ E (J. C. van der Meer Mohr) 20.III.1932 . Paratypes. Republic of Indonesia: Sumatra, Goea Limau Moangkaer , 04°14’ N 98°10’ E (J. C. van der Meer Mohr) 20.III.1932 (2 ♀ paratypes, BMNH) ; Sumatra, Goea Lau Rakit I, 02°20’ N 98°40’ E (J. C. van der Meer Mohr) 5.X.1934 (6 ♀ paratypes, BMNH; 2 ♀ paratypes, NGPC) .

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.