Hypotrabala cinereamargo, 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 : 35-36

Hypotrabala cinereamargo sp. n.

https://zoobank.org/ urn:lsid:zoobank.org:act:70E12A3C-CDE5-485C-A40B-6218FE1B7BB3

( Figs 24–25 , 78 )

Holotype ♂ ( ANHRT):

“ GUINEA 700m / Nimba Mountains , SMFG / concession area ( Societé des / Mines de Fer de Guinée), Cité 1 / 7°42’2.83”N, 8°23’58.60”W / 25.viii-05.ix.2017 General Coll. / Sáfián, Sz., Simonics, G. Leg. / ANHRT:2017.36 // ANHRTUK / 00221066 // Gen. slide No. / LG 6310 ♂ / prep. by Gy. M. Laszlo [black border; partially handwritten]”

Paratypes (2♂♂):

GUINEA: same data as holotype but 16–25.viii.2017, leg. S. Sáfián (1♂ ANHRT) ; SIERRA LEONE: Gori Hills , 375m, 08°27’47”N, 10°46’17”W, 22–29.ii.2020, leg. G. Kalnoi & V. Sinyaev (1♂ ANHRT) .

Description.

Forewing length: holotype: 20 mm; paratypes: 19 mm.

Upperside. Ground colour of head, patagia and prothorax greyish-brown, the head sparsely irrorated with golden scales; tegulae and the rest of the thorax buff irrorated with mahogany scales; abdomen buff. Antenna bipectinate, brown. Forewing pointed at apex, outer margin gently arcuate. Colouration divided into two parts by an irregular line from apex to below the discal spot where it angles to terminate at middle of anal margin, the basal half buff irrorated with dark brown scales and the outer half dark grey. Antemedial fascia mahogany, bilineate, crenulate, arising perpendicularly from costa, and gently angled to terminate perpendicularly along anal margin. CuA vein and especially at base, heavily scaled with mahogany. Discal spot narrow reniform, pale yellow and slightly iridescent, as wide as the widest part of the cell. Postmedial fascia dark brown, bilineate, crenulate, the outer of the two indistinct. Both arise perpendicularly from the costa, angled strongly at vein R5 terminating along anal margin; the outer forms the boundary of the dark outer half of the wing except for between veins M3 and CuA2 where it is indented and the inner line forms the boundary. Subterminal fascia dark grey, paler grey on its outer edge, irregular, broadly parallel to the outer margin, and almost interrupted in spaces M2 and M3 by warm buff patches. Terminal area paler grey. Fringe dark greyish-brown with some yellow irroration especially at the termination of the veins. Hindwing outer margin arcuate, almost angled at vein CuA2; ground colour warm buff becoming darker towards anal fold. Costa and a small patch between vein CuA2 and tornus with mahogany scaling. Fringe pale buff becoming mahogany between CuA1 and tornus.

Underside. Ground colour of head and thorax buff; forelegs greyish-brown, mid- and hindlegs buff with mahogany irroration. Abdomen buff with mahogany tufts medially on each segment. Forewing divided into two following outline of the upperside; ground colour of basal half ferruginous-gold becoming paler towards the anal margin; the outer half greyish-brown. Discal spot narrow, pale yellow. Subterminal fascia almost interrupted in space M2. Terminal area strongly bisected by golden scales along veins. Hindwing ground colour warm buff, costal margin with mahogany scaling from base to Sc+R1 vein.

Male genitalia. Socius very short, ca. one-sixth the length of valve, arms broad at base, abruptly tapered in posterior third to pointed triangular apex arising far apart from each other, largely diverging at ca. 180° angle. Tegumen moderately long and rather narrow, inner margin evenly arcuate. Valve very long, narrow basally, gradually tapered to pointed tip, gently curved in posterior half. Juxta with short, rounded posteromedial process. Vinculum narrow ribbon-like medially, with short, rounded-triangular 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 gradually tapered, curved dorsad, apically pointed. Vesica basally inflated, relatively large, spherical, finely scobinate, anteriorly with two densely serrate, slightly arched longitudinal plates consisting of acute teeth, left arm ca. twice as long as right one; posterior section of inflated vesica with a very long, sharply dentate diagonal serrate plate partly overlapping with left longitudinal serration. Sclerotised plate of eighth sternite anteriorly straight with short thick anterolateral apodemes, posteriorly dilated to two short plates with gently sinuous margin possessing two short and weakly sclerotised posterior projections; posterior plates divided by a shallow depression followed by a very narrow, deep medial incision.

Diagnosis. Both H. cinereamargo and H. igneata are allied to H. joiceyi but in the latter, the buff-coloured patches in the subterminal area are heavily irrorated throughout with dark scales and in the male genitalia, the socii are considerably more robust and broader at base, the valves are shorter and broader, and the juxta is bifurcate. Hypotrabala cinereamargo is sympatric with H. igneata but the latter can easily be distinguished by the larger forewing discal spot, the mahogany-coloured outer half of the forewing and the weaker irroration of mahogany scales in the basal half. In the male genitalia of H. igneata the socii are markedly longer, narrower and digitiform, the valves are shorter, almost straight, subapically tapered and with an apical spine, and both arms of the V-shaped serration of the vesica are equal in length.

DNA divergences. The new species has been assigned the BIN BOLD:ABA0028. The single barcoded specimen had a PWD of 5.3% to H. igneata .

Derivatio nominis. The new species derives its name from the grey outer half of the forewing.

Figures

Figures 22–28. Hypotrabala species: 22. H. joiceyi Tams, 1925, ♂, northeast D.R. Congo [ANHRTUK 00381417]. 23. Id., holotype ♂ [NHMUK 0010292290]. 24. H. cinereamargo sp. n., holotype ♂. 25. Id., paratype ♂. 26. H. igneata sp. n., holotype ♂. 27. Id., paratype ♂. 28. Id., ♀.

Figures 78–83. 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). 78. H. cinereamargo sp. n., holotype [LG 6310]. 79. H. igneata sp. n., holotype [LG 6305]. 80. H. joiceyi Tams, 1925, D.R. Congo [LG 6349]. 81. H. lydiae sp. n., holotype [LG 6318]. 82. H. tabithae sp. n., holotype [LG 6319]. 83. H. volynkini sp. n., holotype [LG 6312].