Leptidea sinapis ( Linnaeus, 1758 )

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 : 425-430

Leptidea sinapis ( Linnaeus, 1758)

ANTENNAL CLUB ( Figs. 12 , 13a, b ). The scaleless club is 513 µm in length in the male and 660 µm in the female.

ANTENNOMERES ( Figs. 12 , 13 a–d). The number of scaleless antennomeres is four in males and five in females. The scaleless antennomeres are depressed, and the maximum l:w ratio is 1: 4 in males and 1: 4.6 in females. In the male, the basal antennomere is partially covered with scales that may conceal a lateral sulcus and part of the central one. Sometimes the distal antennomere has sutures or an incomplete division indicating the fusion of two or three

antennomeres (females). In both sexes the scaled area occupies an equal number of antennomeres on the dorsal and ventral surfaces.

SULCI AND PSEUDOSULCI ( Fig. 13 a–e). In males the trisulcate configuration occurs in all scaleless antennomeres, whereas in females the basal antennomere has a reduced central sulcus or only some chaetic sensilla. The number of sulci is 3–4 central in males and 2–3 central in females and 7–8 lateral. Occasionally, the basal antennomere only has a lateral sulcus, and although they are always partially scaled, in the females, there are fewer scales. In males, the central sulci are more irregular than in females; however, in both sexes they are vertical and have a truncated elliptical shape; in females, the sulci of the basal antennomere are disaggregated. These sulci are truncated and almost always occupy the antennomere of the margin proximal to the distal, forming a continuous groove. In males, the lateral sulci in the first antennomere are rectangular, depressed, and with obtuse angles; in females, they are somewhat elliptical, truncated, and occupy less than half the length of the antennomere. These sulci extend toward the dorsal surface from the second antennomere. Pseudosulci are scarce.

MICROTRICHIA ( Fig. 13f, g ). In this species m1, m2, and m4 microtrichia are present. In the central sulci, the st:m ratio is 1:1.8 to 1:2.2.

TRICHOID SENSILLA ( Fig. 13f ). Theses sensilla average ca. 23 µm in length. Their number in the male antennae ranges from 31 to 64 (total of 201) and in the female from 35 to 64 (total of 147). In females, some of the trichoid sensilla are bifurcate from the middle or the distal third of the flagellum.

CHAETIC SENSILLA ( Fig. 13g ). The sensilla average ca. 26 µm in length. There are four per antennomere on the ventral surface and two on the dorsal surface, for a total of six per antennomere. They are toward the distal margin of the segment.

BASICONIC SENSILLA ( Fig. 13h ). On the ventral surface, basiconic sensilla are distributed almost evenly, whereas on the dorsal surface they are close to the lateral sulci, extending from the ventral surface; they are more frequent toward the apex of the antennal club.

AURICULATE SENSILLA. These sensilla are rather scarce, although present on the ventral and dorsal surfaces.

COELOCONIC SENSILLA ( Fig. 13i, j ). The coeloconic sensilla are located on the ventral surface of the antennal club, primarily at the apex; sc1 and sc2 are present on the dorsal surface near the extended sulci. In this species, both types of coeloconic sensilla are almost always found in pairs.

OTHER SENSILLA ( Fig. 13k, l ). The styloconic sensilla without stylus are scarce and are only found at the apex of the antennal club. On the dorsum of the basal antennomere, there is a rounded opening, but the presence of sensilla is not clear.

Figures

FIGURE 12. A photographic composition of male (A) and female (B) of Leptidea sinapis (x150), bar scale 300 µm. The arrows indicate the scaleless area of the club.

FIGURE 13 (a–f). Antennal club of Leptidea sinapis. a. Antennal club ♂ (x160); b. Antennal club ♀ (x100); c. Distal antennomere ♂ (x320); d. Same as c but in ♀ (x350); e. Central sulcus ♀ (x750 k); f. Trichoid sensilla ♂ (arrows), surrounded by microtrichia ml (m) (x5.00 k).