Leptidea juvernica Williams, 1946

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 : 424

Leptidea juvernica Williams, 1946

ANTENNAL CLUB ( Fig. 11a, b ). The scaleless club is 608 µm in length in the male and 665 µm in the female.

ANTENNOMERES ( Fig. 11 a–d). The number of scaleless antennomeres is four in males and five in females; the distal two are fused. They are depressed and the maximum ratio 1:w is 1:4. The scaled area covers the same number of antennomeres on the dorsal and ventral surfaces.

SULCI AND PSEUDOSULCI ( Fig. 11 a–e). The males show the typical configuration of three sulci in all scaleless antennomeres; in females, the basal antennomere may have reduced sulci or only chaetic sensilla. The sulci number is 3-4 central and 8 lateral in both sexes; the central sulci are irregular but aggregated, sometimes almost ellipsoidal; they extend from the distal margin to the proximal edge of the antennomere, forming a continuous groove. In males, the lateral sulci in the first and second antennomeres are elliptical, and in females they are rectangular with obtuse angles. In both cases, they are truncated and occupy less than half the length of the antennomere. They extend toward the dorsal surface from the first antennomere; in the distal, they are hidden. The pseudosulci are very scarce (at most four in the club) and small (not more than three sensilla); they are almost always found in the basal antennomere.

MICROTRICHIA ( Fig. 11f, g ). In this species m1, m2, and m4 are present. The st:m1 ratio of the central sulci is 1:1.5 to 1:2. In one (of two) male of L. juvernica there has cuticular outgrowths that occupy the space between adjacent microtrichia.

TRICHOID SENSILLA ( Fig. 11f ). These sensilla average 21 µm in length. There are 23 to 64 in the central sulci, for a total of 164 in the male and 121 in the female. These sensilla lack striations, and the pores are conspicuous. In the male, there are several ornaments on the sulci between microtrichia; in the female, theses features are rare.

CHAETIC SENSILLA ( Fig. 11g ). Chaetic sensilla average 26 µm in length. On the ventral surface they have a typical distribution. On the dorsal surface, toward the middle of the antennomere, there are between two and four, for a total of six to eight per antennomere.

BASICONIC SENSILLA ( Fig. 11h ). These are present on the entire surface of the antennomere and are more frequent in the distal one. On the dorsal surface they are distributed near the extended lateral sulci.

AURICULATE SENSILLA. These sensilla are adjacent to the basiconic sensilla, although they are not as abundant as the latter; they are on the dorsal surface.

COELOCONIC SENSILLA ( Fig. 11i, j ). The coeloconic sensilla sc1 and sc2 are present only on the dorsal surface of the antennal club and are more frequent in the distal antennomere.

OTHER SENSILLA ( Fig. 11k, l ). Styloconic sensilla without stylus are more abundant in the female and there are as many as ten very close to each other. On the dorsum of the basal antennomere, a single rounded aperture was observed, where the presence of campaniform sensilla sometimes is not clear.

Figures

FIGURE 11 (a–f). Antennal club of Leptidea juvernica. a. Antennal club ♂ (x140); b. Antennal club ♀ (x150); c. Distal antennomere ♂ (x350); d. Same as c but in ♀ (x370); e. Central sulcus ♀ (x750 k); f. Trichoid sensilla ♂ (arrows), surrounded by microtrichia ml (x3.50 k).