Leptidea amurensis, Menetries, 1859

Llorente-Bousquets, Jorge & Castro-Gerardino, Diana Jimena, 2018, Antennal ultrastructure of Leptidea Billberg, 1820 (Pieridae: Dismorphiinae: Leptideini) and its taxonomic implications, Zootaxa 4402 (3), pp. 401-442 : 414-415

Leptidea amurensis amurensis Ménétries, 1859

ANTENNAL CLUB ( Fig. 6a, b ). The length of the scaleless club is 416 µm in the male and 620 µm in the female.

ANTENNOMERES ( Fig. 6 a–d). Both sexes have five scaleless antennomeres. The distal segment corresponds to two fused antennomeres; the male has a suture on the dorsal surface of the distal antennomere confirming the fusion. The antennomeres are depressed, and the l:w ratio is up to 1: 6 in the male and up to 1: 4.5 in the female. The scaled area covers one antennomere more in the dorsal surface than in the ventral. In the male, the distal antennomere ends in an acute area where there is a small ridge.

SULCI AND PSEUDOSULCI ( Fig. 6 a–f). For both sexes we observed 4 central and 8–9 lateral sulci. In the basal antennomere of the female, there are no sulci or pseudosulci, only a few trichoid and chaetic sensilla scattered; the male basal antennomere have the trisulcate configuration. They are irregular, especially in the male where they appear disaggregated; in the female, they are aggregated. The central sulcus does not occupy the whole length of the antennomere, but approaches the proximal border ( Fig. 6a, b ); the lateral sulci extend toward the dorsum from the second antennomere. In the male, there are some pseudosulci, whereas in the female they are absent ( Fig. 6c, d ).

MICROTRICHIA ( Fig. 6 g–i). We observed m1, m2, and m4. The st:m1 ratio in the central sulci is 1: 2 in males and 1:2.5 to 1: 3.7 in females.

TRICHOID SENSILLA ( Fig. 6g ). These average ca. 19 µm in length. The number of sensilla in the central sulci is 20–38 in the male and 17–45 in the female. The total number is 156 in the male and 132 in the female.

CHAETIC SENSILLA ( Fig. 6h ). These average ca. 31 µm in length. On each ventral and dorsal surface there are four sensilla, resulting in eight per antennomere. On the dorsal surface the chaetic sensilla are located toward the distal edge of the antennomere. In the basal antennomere of the female, there are up to six sensilla, and in the distal anternnomere up to seven. The longitudinal grooves of the sensilla show small rounded bumps.

BASICONIC SENSILLA. Apparently there are no basiconic sensilla in this species, or they are exceedingly rare.

AURICULATE SENSILLA ( Fig. 6i ). These are 11 µm in length. They are scattered in the scaleless antennomere, and occasionally they are in the sulci; they are common on the ventral surface. On the dorsal surface they are scarce, especially in the male, and are located near the lateral sulci.

COELOCONIC SENSILLA ( Fig. 6j ). We found sc1 and sc2, sometimes in pairs. They are located only on the dorsal surface of the antennal club.

OTHER SENSILLA ( Fig. 6k, l ): In the scaleless basal antennomere there are campaniform sensilla, and at the apex of the distal antennomere there are a few styloconic sensilla without stylus.

Figures

FIGURE 6 (a–f). Antennal club of Leptidea amurensis amurensis. a. Antennal club ♂ (x180); b. Antennal club ♀ (x130); c. Distal antennomere (two fused) ♂ (x300); d. Distal antennomere ♀ (x320); e. Central sulcus ♂ (x800); f. Central sulcus ♀ (x800).