Leptidea morsei (Fenton, 1882)

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 : 412-414

Leptidea morsei (Fenton, 1882)

ANTENNAL CLUB ( Fig. 5a, b ): The scaleless club is 493 µm long in the male and 667 µm in the female.

ANTENNOMERES ( Fig. 5 a–d). Males have four scaleless antennomeres and females five; the first antennomere is partially uncovered. The antennomeres are depressed, and their l:w ration is up to 1:6; in the distal segments there is a suture, indicating the fusion of the two distal antennomeres. The scaled area reaches an additional antennomere on the dorsal surface. In males, the antennomeres are more flattened or depressed than in females. The apex of the distal antennomere is more acute in males, whereas it is more rounded in females.

SULCI AND PSEUDOSULCI ( Fig. 5 a–e). Scaleless antennomeres show a trisulcate configuration. In the male, there are 3–4 central and 8 lateral, and in the female 4 central and 7–8 lateral. Central sulci are irregular in males and ellipsoidal in females ( Fig. 5a, b ); in both sexes they are aggregated and are truncated by the distal edge of the antennomere. They extend completely between the distal and proximal edges of the antennomeres forming a continuous groove. In males, the lateral sulci of the two basal antennomeres are truncated and irregular or quasirectangular. In females, the lateral sulci are ellipsoidal, asymmetrical, and truncated. They occupy less than half the height of the antennomere that contains them and extend to the dorsal surface from the second antennomere. The pseudosulci are scarce and small, with a few trichoid sensilla.

MICROTRICHIA ( Fig. 5f, g ). We observed m1, m2, and m4. In the central sulci, the st:m1 ratio is 1:2, sometimes 1:2,6.

TRICHOID SENSILLA ( Fig. 5f ). These sensilla have an average length of 23 µm. In the male, the number of sensilla by sulcus is 30–48 for a total of 125, and in the female it is 8–50, for a total of 138 sensilla.

CHAETIC SENSILLA. These sensilla average 26.5 µm in lnegth. There are four chaetic sensilla on the ventral surface and are four or five on the dorsal surface, for a total of eight or nine per antennomere. On the dorsal surface, chaetic sensilla are located near to the lower and upper edges of the antennomere.

BASICONIC SENSILLA. There are fewer basiconic sensilla than auriculate sensilla, and they are rare or lacking on the dorsal side of the club.

AURICULATE SENSILLA ( Fig. 5g ). These are frequently on the ventral surface. On the dorsal surface they are located near the lateral sulci and are more numerous in the distal antennomere.

COELOCONIC SENSILLA ( Fig. 5 h,i ). The sc1 and sc2 are on the dorsal surface, sc2 are less frequent. On the ventral surface, there are only the sc1 which are scarce and situated near sulci.

OTHER SENSILLA ( Fig. 5k, l ). The styloconic sensilla without stylus are scarce and restricted to the apex of the antenna. There is a rounded opening on the dorsal surface without sensilla. In one of the female specimens we found a styloconic sensilla with stylus on the dorsum of the basal antennomere; it has a smooth wall, broad base, acute apex, and it is surrounded by a cuticular ring that is quite prominent.

Figures

FIGURE 5 (a–f). Antennal club of Leptidea morsei. a. Antennal club ♂ (x200); b. Antennal club ♀ (x100); c. Distal antennomere that equals two fused ♂ (x350); d. Dorsal view of the distal antennomere ♀ (x300); e. Central sulcus ♂ (x750); f. Trichoid sensilla ♀ (arrows), surrounded by microtrichia m1 (x3.50 k).