Baroa seima, Volynkin, 2021

Volynkin, Anton V., 2021, Baroa seima, a new species from Cambodia (Lepidoptera: Nolidae), Zootaxa 5072 (4), pp. 389-395 : 389-394

Baroa seima sp. n.

( Figs 1, 2 , 9, 10 , 15 , 19 )

Type material. Holotype ( Figs 1 , 9 , 15 ): male, “ Cambodia, Mondolkiri Prov., Seima Biodiversity Conservation Area , between Seima and O’Rang, 12°12’12[‘’]N 107°01’09[‘’]E, 300 m, 30.I.2006 leg. G. Csorba & G. Ronkay ” / “Genitalpräparat [genital preparation] Heterocera Nr. 37.109 Museum Witt München” (MWM/ ZSM).

Paratypes: CAMBODIA: 10 males, 1 female, same data as holotype, gen. prep. Nos.: MWM 37.115 (male), MWM 37.116 (female) (prepared by Volynkin) (MWM/ ZSM) ; 6 males, same locality as holotype, 12°15’44’’N, 107°03’49’’E, 360 m, 27–29.I.2006, Csorba & Ronkay leg. (MWM/ ZSM) .

Diagnosis. The new species ( Figs 1, 2 ) is externally reminiscent of B. vatala Swinhoe, 1894 ( Figs 3, 4 ) widely distributed in Himalaya, northern Indochina and China, but is distinguished by the darker body and wing colouration, the larger black markings of the forewing, and the ochreous-brown suffusion on veins which is pale yellowish in B. vatala . Additionally, in the male of B. seima sp. n., the prothorax and the tegula lack medial black spots. Compared to another similar species, the Sundanian B. horaki Černý in Černý & Pinratana, 2009 ( Figs 5, 6 ), B. seima sp. n. has the male thorax without black spots, a narrower and more elongate male forewing (length/width ratio is 2.25 vs. 2.05 in B. horaki ), a darker forewing ground colour (ochreous-brown in male and brown in female vs. pale ochreous and ochreous in male and female of B. horaki respectively), a forewing markings consisting of the black spots (blackish-brown spots and brown streaks in B. horaki ), and a monotonous hindwing with a transverse line (whereas the hindwing of B. horaki is paler subbasally and lacks a transverse line). The male genital capsule of B. seima sp. n. ( Figs 9, 10 ) is similar to that of B. vatala ( Fig. 11 ) but differs in the large, triangular dorsal crest of the uncus (reduced as a protuberance in B. vatala ), the longer lateral branches of the uncus (in proportion to the length of the valva), and the somewhat thicker saccular process. Compared to that of B. horaki ( Figs 12 , 13 ), B. seima sp. n. has a longer and wider medial crest and distally thinner lateral branches of the uncus, somewhat shorter vinculum (in proportion to the tegumen length), and thinner and almost straight saccular process (slightly curved in B. horaki ). The phallus of the new species is shorter than in B. vatala (in proportion to the length of the tegumen-vinculum complex), slightly curved, and distally thicker. The phallus of B. seima sp. n. differs from that of B. horaki in the bilobate coecum (unilobate in B. horaki ), and the thicker and less curved medial and distal sections. Additionally, males of the three species well differ from each other in the shape of the 8 th abdominal segments ( Figs 15–17 ). The female genitalia of the new species ( Fig. 19 ) are distinguished from those of B. vatala ( Fig. 20 ) by the considerably shorter and conical posterior sclerotised section of the ductus bursae (in B. vatala it is tubular and anteriorly curved), and the longer and broader corpus bursae with longer signa. The female genitalia of B. seima sp. n. differ from those of B. horaki ( Fig. 21 ) in the shorter, trapezoid dorsal subostial plate (shield-shaped in B. horaki ), the shorter, conical posterior sclerotised section of the ductus bursae (it is narrowly tubular in B. horaki ), the narrower and membranous posterior end of the posterior section of the ductus bursae (it is sclerotised and swollen in B. horaki ), the 1.15× longer and 1.35× broader corpus bursae, and the considerably longer and wider signa bursae (1.66× and 1.26× longer left and right ones, respectively).

Description. External morphology of adults. Male ( Fig. 1 ). Head ochreous-brown. Antenna weakly ciliate. Thorax orange-ochreous. Forewing with somewhat convex anal margin and rounded apex. Forewing ground colour ochreousbrown with brown suffusion interveins medially and distally. Markings black. Basal spot round. Subbasal line represented by short streak on Sc. Antemedial area with thin streak between Sc and R. Antemedial line marked only by rounded spot between costa and Sc and streak between Sc and R. Discal spot as a black dot, round. Postmedial line distinct, curved outwards between R and Cu2, interrupted by veins, diffuse between M 1 and costal margin, interrupted into more or less elliptical spots of different sizes between veins. Cilia brown, chequered, paler at veins. Hindwing greyish-brown with ochreous-yellow suffusion basally and along anal margin. Transverse line dark greyish-brown, thin, diffuse, indistinct at anal margin. Cilia greyish-brown. Abdomen orange-ochreous proximally and ochreous distally. 8th tergite moderately sclerotised, with two anterio-lateral triangular and apically rounded apodemes. 8th sternite heavily sclerotised, trapezoid with triangular apodeme projected anteriorly and two medial thorn-like processes posteriorly ( Fig. 15 ).

Female ( Fig. 2 ). Head brown. Antenna filiform. Thorax brown with black medial spots on prothorax and mesothorax; patagia brown with black spot inwardly; tegula brown with black spot anterio-medially. Forewing ground colour brown with ochreous-brown suffusion on veins. Markings black. Basal spot round. Subbasal line represented by a spot between costa and Sc and a spot between Cu and A 1+2 veins. Antemedial area with thick streak between Sc and R veins. Antemedial line curved, consisting of four round spots: between costa and Sc vein, between Sc and R veins, in cell and between Cu and A 1+2. Discal spot as a black dot, nearly triangular. Postmedial line curved outwards between veins R and Cu2, interrupted into more or less elliptical spots of different sizes between veins. Cilia brown, chequered, paler at veins. Hindwing brown with slight ochreous suffusion basally. Medial transverse line thin, medially curved, interrupted on veins, indistinct at costal and anal margins. Cilia monotonous brown. Abdomen brown with black medial spot basally and deep yellow apically.

Male genitalia ( Figs 9, 10 ). Uncus with swollen triangular dorsal crest and two distally setose, pointing posteriorly and apically rounded digitiform processes. Tegumen moderately sclerotised with arcuate arms terminating by large, swollen penicular lobes bearing dense tuft of long androconial hairs. Vinculum ca. 1.5 times shorter than tegumen, V-shaped with rounded tip. Valva lobular, membranous, with weakly sclerotised triangular lobe positioned at distal end of saccular process. Costa short (ca. half of valva length), weakly sclerotised, forming crest-like ventral fold. Sacculus short (ca. 1/3 of valva length), heavily sclerotised, with robust thorn-like distal process with trapezoid tip directed dorsad. Juxta triangular with elongate anterior process, weakly sclerotised. Phallus short and narrow (in proportion to genital capsule size), distally tapered, with elongate (0.3× length of whole sclerotized shaft) and bilobate coecum and tiny triangular carinal thorn ventrally. Vesica with band-shaped sclerotised plate.

Female genitalia ( Fig. 19 ). Papilla analis broadly trapezoid with rounded corners, weakly setose. Apophysis posterioris triangular. Apophysis anterioris ca. 3 times longer than posterioris, slender, flattened, anteriorly gradually tapered. Ventral subostial plate trapezoid, heavily sclerotized. Ostium bursae elliptical, narrower than subostial plate. Ductus bursae 1/5 of the length of corpus bursae, with funnel-like, heavily sclerotized posterior section; anterior section thin, weakly sclerotized, ca. 3 times shorter than posterior one. Posterior section of corpus bursae tubular, narrow, dilated anteriorly, ca. 1.5 times longer than ductus bursae, membranous. Anterior section of corpus bursae large, sack-like, membranous, bearing two elongate band-like signa, of which right one wider and ca. 2.4 times longer than left one. Each signum with medial longitudinal groove and serrulation laterally. Appendix (cervix) bursae absent.

Distribution. Known only from eastern Cambodia.

Etymology. The specific epithet is a homonym of its type locality.

Figures

FIGURES 1–8. Baroa spp.: adults. Depositories of the specimens: 1–5, 7 and 8 in MWM/ZSM; 6 in RBINS.

FIGURES 9–12. Baroa spp.: male genitalia. The specimens dissected are deposited in MWM/ZSM.

FIGURES 13–18. Baroa spp.: male genitalia (13, 14) and 8th male abdominal segments (15–18). Depositories of the specimens dissected: 13 in RBINS; 14–18 in MWM/ZSM.

FIGURES 19–22. Baroa spp.: female genitalia. Depositories of the specimens dissected: 19, 20 and 22 in MWM/ZSM; 21 in RBINS.