Patia orise denigrata

Castro-Gerardino, Diana Jimena & Llorente-Bousquets, Jorge, 2019, Antennal ultrastructure in Patia (Pieridae, Dismorphiinae), Zootaxa 4559 (3), pp. 445-472 : 454-455

Patia orise denigrata (male)

ANTENNAL CLUB ( Fig. 4c ): The nudum measures 4.5 mm.

ANTENNOMERES: They present 14 scaleless antennomeres, and the first of the nudum has scales toward its proximal margin. All antennomeres are depressed except the compressed distal. The l/w ratio is 0.9 and 0.8 in the proximal antennomeres; in the medial and distal (from the fifth to the twelfth) is 0.7, and in the distal is 1.6. The proximal antennomeres are quasi-cylindrical, and the medial and distal are doliform (barrel-shaped); the distal segment (fused) is cupuliform (dome-shaped) and lengthen.

SULCI AND PSEUDOSULCI: It has 13–14 central and 28 lateral sulci. The trisulcate configuration is in all antennomeres. In the first segment of the nudum, the central sulcus is disaggregated and split into two large pseudosulci containing six and nine trichoid sensilla. The central sulci occupy one-third or one-half of the length of the antennomere that contains them. In the medial and distal segments, they are more extended. In all cases, the central sulci are close to the distal margin of the antennomere but separated from it by two or four rows of microtrichia m2; the central sulci are more separated from the distal margin in the proximal antennomeres than in the distal ones. The central sulci are complete (not truncated), their shape is irregular, and they are longer than they are wide. Also, its edges are discontinuous, in those found in the proximal and distal segments. The lateral sulci are smaller than the central sulci and occupy one-fourth to one-third of the length of the antennomere; in the first two scaleless segments, the lateral sulci occupy less than 1/5 of the length of the antennomere. The lateral sulci increase in size in the medial and distal segments. One to seven rows of microtrichia m2 separate them from the distal margin of the antennomeres; they are not truncated. They have an irregular shape and have a discontinuous perimeter although some distal are quasi-elliptical and continuous. In the first antennomere of the nudum, there is one small pseudosulcus (4 st) instead of one of the lateral sulci. The pseudosulci (ps) are present in all the segments of the nudum, and the smallest ones (only one st) are the most frequent. The largest ones (5–11 st) are in the proximal and distal segments where the pseudosulci are more numerous and the sulci are more irregular. The larger ones are on the sides, between the central sulcus and the lateral sulci; the larger ones are irregular and elongated, and the smaller ones are quasi-circular. The pseudosulci with a single trichoid sensillum are on the antennomeres near or not to the sulci. In the distal antennomere, the pseudosulci are scarce.

MICROTRICHIA: There are microtrichia m1 and m2. The st:m1 ratio in the central sulci is 1: 3 in most of them; however, in some, it is 1:4 and 1:5. In the lateral sulci the st:m1 ratio is 1:3 and rarely is 1:4.

TRICHOID SENSILLA: The trichoid sensilla measure on average 21.4 µm (n = 20; 16.4–29.3 µm). The st in the pseudosulci have a similar average length: 21.2 µm (n = 6; 19.2–23.2 µm). The number of trichoid sensilla in the central sulci show an irregular distribution and reach their greatest number in the fifth antennomere. In the lateral sulci, the trichoid sensilla number is almost the half of the central ones. In the eighth antennomere, the number of sensilla of the central sulcus is nearly three times that of the lateral sulcus. The lateral sulcus of the fourth antennomere has the largest number of st.

CHAETIC SENSILLA: The average length is 34.8 µm. In almost all antennomeres, except the first one, the chaetic sensilla show the typical distribution of the subfamily.

OTHER SENSILLA ( Fig. 4k ): The sensilla outside the central sulci are scarce in the proximal joints, and the density increases along the nudum; however, they are few in comparison to other Patia. The basiconic sensilla predominate outside the sulci and pseudosulci; there are about two to three times as many as auriculate sensilla; toward the sides, the number of auriculate sensilla decreases whereas the basiconic and coeloconic ones have a similar density. The coeloconic sensilla (sc) are near the lateral sulci. The squamiform sensilla are in the basal antennomeres and measure about 34.4 µm. The styloconic sensilla without stylus (sty) are in the first antennomere of the nudum, and they are scarce.

Figures

FIGURE 4 (a–f). Antennal microstructures of Patia orise. a. Antennal club of the male of P. o. orise; b. Antennal club of Patia o. orise female (scale bar 100 µm); c. Antennal club of Patia o. denigrata male; d. First antennomere partially scaled in P. o. orise female showing the left lateral sulci and the central somewhat disaggregated (x242); e. Distal antennomere in P. o. orise male (fused); three central sulci (arrows) (x145); f. Lateral view of the distal antennomere showing two right lateral sulci (continuous arrows) in P. o. orise female. Note that the division between this and the penultimate is incomplete (dashed arrow) (x150).