Homoeosoma oxyargentella, Tsvetkov, 2020

Tsvetkov, E. V., 2020, A new species of the genus Homoeosoma (Lepidoptera: Pyralidae: Phycitinae) from the Leningrad Province, Russia, Zoosystematica Rossica (China) 29 (1), pp. 115-121 : 116-119

publication ID

https://doi.org/10.31610/zsr/2020.29.1.115

publication LSID

urn:lsid:zoobank.org:pub:5659BBCF-F201-4A1A-8F19-4CA9919318E6

persistent identifier

https://treatment.plazi.org/id/692AFE41-1B68-FFF9-0F01-43147BD1264F

treatment provided by

Felipe

scientific name

Homoeosoma oxyargentella
status

sp. nov.

Homoeosoma oxyargentella sp.nov.

(Figs 1–3, 5–9)

Holotype. Male, Russia, Leningrad Prov., Volosovo Distr., environs of Lake Khyul’gyuzi , 25.VI.2015, leg. E. V. Tsvetkov ( ZIN).

Paratypes (all in ZIN). The same data as for holotype, 2 males, 1 female ; the same locality and collector, 27. VI.2014, 1 male, 2 females , 18.VII.2015, 1 female ; environs of Dontso Vill., 28. VI.2014, the same collector, 1 female.

Description. Length of forewing 8–9 mm. Labial palpi, frons, thorax, legs and abdomen grey, with admixture of whitish scales. Forewing ground colour grey or silvery grey (Figs 1–3), costal margin marked with dark scales; blackish medial dots distinct, rounded, in some specimens slightly elongated along veins; three postbasal black dots small, sometimes streaklike or nearly indiscernible; postmedial oblique line almost straight, pale, outlined with dark grey from both sides, more extensively near costal margin; marginal blackish dots sometimes forming broken dark line along outer margin; some specimens (holotype and two paratypes) with submarginal row of dark streaks along veins. Hindwing grey. Both wings uniformly grey from underside and with grey fringe.

Male genitalia ( Figs 5, 6 View Figs 5–8 ). Uncus elongate trapezoidal, with rounded apex, lateral margins curved down, dorsal surface densely covered with wards corpus bursae. Corpus bursae ovoid, dentation on its surface almost indiscernible; signa narrow, with wide and short triangular dentes of different size in several rows.

Diagnosis. The colour-

ation of the new species is typical for the genus, and external characters may be unreliable for identification of the species in some cases,

but it can be easily recog-

nised by the male and female genitalia.

In H. nimbella (Du-

ponchel, 1837), the forewings usually have light reddish strip between Cu stalk and A vein, which is absent in H. oxyargentella sp. nov.

The males of H. nimbella are well distinguished from the males of the new species by Figs 1, 2. Homoeosoma oxyargentella sp. nov., habitus of imago. 1, holotype; free and very long processes 2, paratype, female, Lake Khyul’gyuzi, 27 June 2014. Scale bar: 1 cm.

of vinculum and by anterior-

ly convex gnathos. Females long bristles. Gnathos large, broadly triangular, of H. nimbella have longer segment 8 and posteapically pointed, with oblong and upcurved lat- rior apophyses ( Fig. 10 View Figs 9–13 ). In H. calcella auct., the eral angles; its anterior margin straight or only forewing is narrower, with the ratio of length to slightly convex. Valva relatively long and narrow; width more than 3.5 (vs 3–3.4 in H. oxyargentelsacculus rather long, narrowed medially. Lobes of la sp. nov.), and its ground colour is more light, juxta narrowly digitiform. Processes of vinculum whitish. The male genitalia of H. calcella are sphenoid, pointed and very short ( Fig. 5 View Figs 5–8 ). Aedea- 1.3–1.4 times as large as those of the new species; gus broadest medially, narrowed at both ends; in females, the tergum 8 of H. calcella is longer vesica armed with curved sclerotised elongate (about 0.6–0.7 mm vs 0.4–0.5 mm in H. oxyarplate ( Fig. 6 View Figs 5–8 ). The eighth sternum bearing weakly gentella sp. nov) and the posterior apophyses are sclerotised horn-like posterior process; its anteri- much longer also ( Fig. 11 View Figs 9–13 ). The species H. inustel- or edge formed by heavily sclerotised, arched and la Ragonot, 1884 differs by the whitish or creamy very narrow plate ( Fig. 7 View Figs 5–8 ). Culcita absent. Poste- colouration of the forewing and the presence of rior margin of the eighth tergum widely rounded; free lateral processes of vinculum in males; feits anterior margin with large notch and Y-shaped males of this species have the same genital charsclerotised area ( Fig. 8 View Figs 5–8 ). acters as in H. nebulella , differing them from Female genitalia ( Fig. 9 View Figs 9–13 ). Papillae anales elon- H. oxyargentella sp.nov. ( Fig. 12 View Figs 9–13 ). In H. nebulella gate, tapering to pointed apices. Anterior apophy- ([Denis & Schiffermüller], 1775), the forewing is ses 1.6–1.7 times as long as papillae anales and narrower than in the new species, with a less fineslightly broader than posterior apophyses; poste- ly marked postdiscal light oblique line; the male rior apophyses 1.5 times as long as anterior ones. genitalia with quite distinct lateral processes of Ductus bursae membranous, slightly widened to- vinculum, which are absent in the new species.

E. V. Tsvetkov. A new species of the genus Homoeosoma

Etymology. The name of the new species is a noun derived from the Ancient Greek prefix oxy- and the Latin word argentum.

Distribution. The species inhabits the Izhora Plateau in the Leningrad Province. It is found in two closely situated localities near the Dontso Village at the source of the Oredezh River and near Lake Khyul’gyuzi (14 km NW from the first locality).

Bionomics. Homoeosoma oxyargentella sp. nov. is a narrowly distributed species occurring on chalk grasslands (Fig. 4) with diverse vegetation composed by Gentiana cruciata L., Cypripedium calceolus L., Orchis militaris L., Trifolium montanum L., Plantago lanceolata L., Agrimonia eupatoria L., Melampyrum nemorosum L., Centaurea scabiosa L., Scorzonera humilis L., and Leucanthemum vulgare Lam. The flight period is rather short and lasts from late June to mid-July. Just hatched moths are active at twilight and during the daytime in cloudy weather. In the evening, the moths often sit on grassy plants and fly away being disturbed.

Herewith I provide a key to the European species of the genus, based on the male genitalia and external characters. Homoeosoma candefactella is absent here as this species is known only from females. All the Asian species are quite distinct from the new species and are not mentioned in this paper.

V

Royal British Columbia Museum - Herbarium

ZIN

Russian Academy of Sciences, Zoological Institute, Zoological Museum

VI

Mykotektet, National Veterinary Institute

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Lepidoptera

Family

Pyralidae

Genus

Homoeosoma

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