Arytinnis occidentalis, Percy Csiro, 2003

Percy Csiro, Diana M., 2003, Legume-feeding psyllids (Hemiptera, Psylloidea) of the Canary Islands and Madeira, Journal of Natural History 37, pp. 397-461 : 426-429

Arytinnis occidentalis sp. n.

(figures 9, 10C, 19B)

Adult

Colour. Bright green or yellow-green; forewing clear, veins uniform mid-brown. Structure. Surface forewing spinules present in all cells, but reduced in one or more cells, or if absent only from cell c+sc, where there are typically few present, density sparse: less than 40 per 0.1 mm 2; apical spines in wing cells cu, m and m, 1 1 2

but absent, or occasionally few present in cell r. Antennae long; genal cones short. 2

Male genitalia as in figure 9F–I; paramere with a medial ridge present on the inner surface, apex in dorsal view contiguous anteriorly with inner margin concave (figure 10C); aedeagus distal segment with a well-developed, curved hook. Female genitalia as in figure 9E; egg with stout lateral pedicel at the base.

Adult measurements and ratios. (6 W, 6 X) total length: W 2.92 –3.48, X 3.08–3.88; WL: W 2.4 –2.72, X 2.55–3; HW: W 0.76 –0.82, X 0.8–0.89; AL: 1.7–2.1; GC: 0.1–0.13; PB: 0.14–0.19. WLPT: 2.83–3.33; GCVL: 0.46–0.57; VLW: 0.45–0.5; WLW: 2.38–2.58; CUR: 1.63–2.04; MR: 0.42–0.55; TLFL: 1.16–1.22. Adult genitalia W: MP: 0.24–0.27; PL: 0.35–0.4; AEL: 0.28–0.31; MSLH: 1.17–1.29; AHS: 0.3–0.32; PLSH: 1.06–1.18. X: FP: 0.69–0.79; FSP: 0.47–0.56; RL: 0.21–0.24; OV: 0.15–0.17; EL: 0.23–0.28.

Nymph

Colour. First to third instars cream and orange-red, 4th–5th instars pale grey-green, blue-green or yellow-green, with or without black tergites.

Fifth instar structure. Antennal segments eight.

Fifth instar measurements. (Specimens 5) BL: 1.55–1.93; BW: 0.98–1.15; WL: 0.56–0.64; CPL: 0.47–0.51; CPW: 0.67–0.74; RW: 0.19–0.21; HW: 0.64–0.73; AL: 1.1–1.15.

Fifth instar chaetotaxy. Head setae simple; ocular seta simple, typically dark and conspicuous; primary and secondary post-ocular setae simple or narrowly capitate. Dorsal thoracic setae long simple. Forewing pad macrosetae two, marginal (one apical, one proximal), apical seta distinctly capitate, proximal seta simple or narrowly capitate; hindwing pad with one apical macroseta, distinctly capitate, paired with small simple seta, proximal seta short simple; simple microsetae scattered on the wing pad surfaces. Dorsal abdominal pre-caudal macrosetae present on anterior tergites, long simple, caudal plate macrosetae typically absent or two simple or narrowly capitate; sectasetae four pairs; marginal abdominal setae (other than sectasetae) three pairs, distinctly capitate; pleurite setae paired capitate and simple. Legs with simple setae only.

Host plant. Teline stenopetala ssp. sericea , ssp. stenopetala and ssp. microphylla .

Distribution. Canary Islands: La Palma and El Hierro.

Notes. Occurs on the two most westerly islands, sympatrically with A. modica on the host plant, Teline stenopetala . In May, it is less common than A. modica on the two host subspecies restricted to the humid laurisilva habitat, ssp. stenopetala and ssp. microphylla ; but during the same period it is abundant on ssp. sericea in dry pine forest habitat, from which A. modica was absent. In July, A. occidentalis was found to be more common than A. modica on both ssp. stenopetala and ssp. microphylla , suggesting (as with sympatric species on the host plant Teline microphylla ) different timing of development and habitat preference.

Biology. Eggs were found singly scattered on the calyx, in small clusters under floral bracts or at the base of developing fruit under the persistent calyx. Small nymphs (1st–3rd instars) were observed on the corolla and base of the developing fruit, however, nymphs were more typically found on leaf buds and petioles. Larger nymphs (3rd–5th instars) and occasionally eggs were also found on the underside of mature leaves.

Etymology. Named for the geographic distribution of this species in the most westerly islands, La Palma and El Hierro.

Type material. Holotype W (slide mounted), Canary Islands, La Palma: rd to La Cumbrecita, 28°41∞15◊N, 17°51∞30◊W, 1250 m, 16 May 1998 ( BMNH) . Paratypes 42 W, 41 X, 12 nymphs, as for holotype ( BMNH) . 2 W, 1 X, 5 nymphs, as for holotype ( DZUL) . 1 W, 2 X, 5 nymphs, as for holotype ( NHMB) . El Hierro: 61 W, 52 X, 5 nymphs, El Golfo, rd to Frontera, 27°44∞N, 18°01∞30◊W, 1100 m, 22 May 1998 ( BMNH) . 1 X, as for previous (DZUL). 2 W, 1 X, as for previous (NHMB).

Other material examined. La Palma: 6 W, 4 X, 2 nymphs, SE rd Santa Cruz to La Caldera, 28°43∞N, 17°46∞W, 930 m, 15 July 1997 ( DP 73 ) . 2 W, 3 X, Los Tilos, Barranco del Agua , 28°47∞30◊N, 17°47∞45◊W, c. 500 m, 17 May 1998 ( DP 192 ) . 2 W, 3 X, ca 3 km E of Roque Faro, 28°48∞15◊N, 17°52∞30◊W, ca 900 m, 19 May 1998 ( DP 200 ) . El Hierro: 8 W, 5 X, El Golfo, rd to Frontera, 27°43∞30◊N, 18°1∞30◊W, 1070 m, 11 July 1997 ( DP 61 ) . 5 W, 3 X, between Mirador de la Peña and Mirador Jinama , 27°47∞30◊N, 17°58∞W, 900–960 m, 12.vii.1997 ( DP 63 ) . 19 W, 7 X, nr Arbol Santo, 27°47∞30◊N, 17°56∞30◊W, ca 1000 m, 23 May 1998 ( DP 214 ) .