Platycerota incertaria (Leech, 1891)

Beljaev, E. A., 2020, New contribution into concept of the tribe Deveniliini (Lepidoptera: Geometridae, Ennominae) based on skeleton-muscular anatomy of the male genitalia, Far Eastern Entomologist 420, pp. 1-13 : 4-6

Platycerota incertaria (Leech, 1891)

Figs 3, 4

MATERIAL. Russia: Sakhalin, Yasnomorskoe vicinity, N slope of Sokhonda mountain , 46°44'52"N, 141°55'01" E, 70 m asl, 21–23.VII 2019, 2♂, E.A. Beljaev leg.

MALE GENITALIA ( Figs 3, 4 ). The skeleton. Genital segment is clearly divided on tegumen and vinculum by thin narrowing. Lateral lobes of tegumen are narrow,

ribbon-like, dorsally connected to each other by very small, almost point-like, bridge.

Vinculum is wide, strongly sclerotized, laterally with a pair deeply invaginated ribs,

ventrally broad, lobe-like, subdivided posteriorly by long narrow split. Uncus is strong, L-shaped curved, with semisclerotized socii laterally. Gnathos is vestigial,

represented by a pair of small thin bars laterad of the uncus base. Valvae are long,

narrow, dorsally connected with vinculum by strong articulation formed by posterior the male genitalia, ventroposterior view, muscles m1, m4, m6(5) are not shown on the right, and muscles m2(10), m3(2), m5(7), m7(6) are not shown on the left; 4 – phallus, dorsolateral view,

muscles m6(5) and m7(6) are not shown on the right. 5, 6 – Synegia ichinosawana (Matsumura,

1925): 5 – the male genitalia, ventroposterior view, muscles m2(10), m3(2), m4 are not shown on the right, and muscles m1, m5(7), m6(5), m7(6) are not shown on the left; 6 – phallus,

dorsolateral view, muscles m6(5) and m7(6) – are not shown on the right. Abbreviations: see

Fig. 1 .

dilation of vinculum and anterior thickening of lateral wall of the costa valvae. Costa is wide, well sclerotized, distally somewhat dilated and bearing apical finger-like process, medially with hemitranstilla lacking, but with short and narrow medioventral spring, separated from costa by narrow split. Cucullus spreads along the costa, weakly delimited from valvula. Clasper is a trapezoidal sclerotized plate. Sacculus is relatively short, well sclerotized. Juxta is strong, wide but short, roughly pentagonal,

with flattened conic medial invagination, dorsolaterally connected with a pair of enormous labides. The labides are heavy sclerotized, irregular quadrangle, flat,

spinose sclerites, laterally loosely connected to the base of costa valvae. Aedeagus is large, sclerotized, cylindrical at basal half and dilated jaws-like distally, vesica is armed with a number firm needle-like cornuti.

The musculature. Depressors of the uncus, m1, are moderate, extending from ventral corners of tegumen, distally attached to the lateral sides of uncus at the base of its distal process. Anal cone retractors, m2(10), are extending from anterior rib of lateral lobes of tegumen remote from their dorsal connection. Dorsal abductors of valvae, m3(2), are strong but short, extending from the most ventral portion of tegumen to membranous thickening between the valva costa and ventrolateral corner of the labium. Adductors of valvae, m4, are strong, wide and long, extending ventrally from lateral invaginated ribs of vinculum to medioventral spring of costa.

Probably, this spring is vestigial basal process of valvae, which in many Ennominae forms ventral protrusion of hemitransilla serves as an apodema for m4. Flexors of valvae, m5(7), are short, moderately wide, proximally attached to the basal corner of sacculus, distally extending to median aria of medial plate of clasper. Ventral extensor of valva, m8(3), is paired, powerful, extending proximally from posterior ridges of ventral lobes of the vinculum, distally attaching to the median invagination of juxta. Protractors and retractors of the phallus, m6(5) and m7(6), are paired, relatively thin, first ones extending from near the dorsal corners of vinculum and distally attached to lateral sides of anterior opening of aedeagus, and second ones extending from anterior top of saccus to the middle of ventral side of aedeagus. Retractor of vesica, m21, is present, but not shown.

NOTE. Stüning (2000) synonymised Crypsicometa with Platycerota , referring the Holloway's (1994) suggestion on their synonymy. P. incertaria , the type species of Crypsicometa , differs from other Platycerota by the present of tremendous labides,

but in other structures of the male genitalia it well conforms to the latter. Thus, the male genitalia musculature of P. incertaria can presents its pattern in the genus.

Figures

Figs 3–6. Musculature of the male genitala. 3, 4 – Platycerota incertaria (Leech, 1891): 3 –

Figs 1, 2. Devenilia corearia (Leech, 1891), musculature of the male genitala. 1 – the