Hypotrabala indefinita, Takano & László, 2024

Takano, Hitoshi & László, Gyula M., 2024, Descriptions of new Hypotrabala Holland, 1893 (Lepidoptera: Lasiocampidae: Lasiocampinae: Selenepherini) in the collections of the African Natural History Research Trust, with notes on allied genera and the description of a new genus, Ecologica Montenegrina 72, pp. 19-63 : 47-48

Hypotrabala indefinita sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:E30FB846-7134-47B6-A26B-C0323DB5742B

( Figs 52–53 , 69 )

Holotype ♂ ( ANHRT):

“ SIERRA LEONE 375m / Kono Province , Gori Hills, / Near Giehum / 08°27’47”N, 10°46’17”W / 22- 29.ii.2020 / Kalnoi, G., Sinyaev, V. Leg. // ANHRT:2020.14 // ANHRTUK / 00288690 // Gen. slide No. / LG 6324 ♂ / prep. by Gy. M. Laszlo [black border; partially handwritten]”

Paratype ♂:

SIERRA LEONE: same data as holotype (1♂ ANHRT) .

Description.

Forewing length: holotype 25 mm; paratype: 22 mm.

Upperside. Ground colour of head, thorax and forewings orangey-brown; abdomen and hindwings warm buff. Forewing pointed at apex, outer margin gently arcuate. Forewing irrorated with golden yellow scales basally and anteriorly. Antemedial fascia mahogany, bilineate, crenulate, the inner of the two less pronounced, arising perpendicularly from costa, and gently angled to terminate perpendicularly along anal margin. Discal spot small, reniform, silvery-white and ringed in mahogany. Postmedial fascia greyish-brown, bilineate, the inner of the two crenulate, the outer of the two indistinct. Both arise perpendicularly from the costa the inner angled strongly at vein R5 terminating along anal margin. Area between postmedial and subterminal fascia with heavy brown scaling, becoming darker and greyer at tornus. Subterminal fascia charcoal, broadly running parallel to the outer margin, irregular, indented, most strongly defined on its outer edge. Terminal fascia greyish-brown bisected by orange scales along veins. Fringe dark greyish-brown. Hindwing outer margin arcuate, almost angled at vein CuA2; ground colour turning darker towards the anal fold. Costa with mahogany scaling. Fringe buff becoming dark brown at the tornus.

Underside. Ground colour of head, thorax and abdomen buff; forelegs brown. Ground colour of both wings buff, hindwing slightly paler. Discal spot narrow, creamy-white, indistinct. Postmedial fascia well-defined only at along costa. Subterminal and terminal fascia as on upperside but less well-defined. Hindwing with mahogany scaling along costa.

Male genitalia. Socius long, ca. half the length of valve, arms gradually tapered to pointed apex, arising far apart from each other, largely diverging at ca. 120° angle. Tegumen moderately long and broad, inner margin evenly arcuate. Valve long, narrow basally, gradually tapered to pointed tip, subapically gently arched. Juxta with short, rounded posteromedial process. Vinculum narrow ribbon-like medially, with short, truncate lateral plates with straight margins. Phallus short, coecum penis large, as long as sclerotised part of phallus, membranous sack-like, tightly attached to juxta; sclerotised section of phallus slightly dilated medially, then tapered and curved dorsad, apically pointed. Vesica basally inflated, relatively large, somewhat ovoid, finely scobinate, anteriorly with two densely serrate longitudinal plates consisting of fine teeth, forming a V-shape with slightly sigmoidal arms; posterior section of inflated vesica with short, dentate diagonal sclerotisation. Sclerotised plate of eighth sternite anteriorly slightly concave with relatively long, thin anterolateral apodemes, posteriorly dilated to two short, triangular plates with short posterior sclerotisations of variable width divided by shallow medial depression.

Diagnosis. Hypotrabala indefinita is most similar to H. giustii but in the latter the ground colour of the forewing is paler and the outer half is darker, whilst in the genitalia, the socii are shorter and broader and the valves are longer and subapically angled. The male genitalia of H. indefinita is most similar to the phenotypically distinct H. pruinosa but in the latter, the socii are shorter and apically rounded, the valves are slightly shorter and the posterior projection of the eighth sternite is shorter.

DNA divergences. Unavailable.

Derivatio nominis. The new species derives its name from the plain habitus which lacks any definite characters.

Figures

Figures 50–59. Hypotrabala species: 50. H. pruinosa sp. n., holotype ♂. 51. Id., paratype ♂. 52. H. indefinita sp. n., holotype ♂. 53. Id., paratype ♂. 54. H. pallens sp. n., holotype ♂. 55. Id., paratype ♂. 56. H. obscura sp. n., holotype ♂. 57. Id., paratype ♂. 58. H. dollmani Tams, 1925, holotype ♂ [NHMUK 010292293]. 59. Id., paratype ♂ [NHMUK 010292327].

Figures 66–71. Male genitalia of Hypotrabala species, a: clasping apparatus, b: lateral view of phallus, c: eighth sternite, d: dorsal view of phallus (a, b, c to scale, d magnified). 66. H. exquisita sp. n., holotype [LG 6307]. 67. H. extenuata sp. n., holotype [LG 6309]. 68. H. pruinosa sp. n., holotype [LG 6285]. 69. H. indefinita sp. n., holotype [LG 6324]. 70. H. pallens sp. n., holotype [LG 6293]. 71. H. ophioglossa sp. n., holotype [LG 6287].