AnimaliaHemipteraLiviidaeMartoniFrancescoBrownSamuel D. J.An annotated checklist of the Cook Islands psyllids with keys to the species and two new records (Hemiptera, Psylloidea)Zookeys3112201820188119110810.3897/zookeys.811.28829 Trioza alifumosa Klyver, 1932Figures 11–20, 26Material examined.

11 females, 8 males. A single population of this species was collected on Rarotonga, on the summit of Raemaru at an elevation of 380 m. On 16 March 2017 all 19 individuals were collected from a single plant of Metrosideroscollina (J.R.Forst. and G.Forst.) A.Gray.

Measurements.

Measurements are in mm (n = 2 ♂, 3 ♀ unless reported differently in brackets). Length of body (vertex to terminalia) ♂ 1.30–1.45, ♀ 1.60–1.78; length of body (vertex to apex of folded wings) ♂ 2.57–2.81, ♀ 2.86–3.10; width of head (HW) ♂ 0.50–0.53, ♀ 0.52–0.57 (n = 2); length of genal processes (GCL) ♂ 0.09–0.14 ♀ 0.10–0.13 (n = 2); length of vertex (VL) ♂ 0.21, ♀ 0.20–0.25 (n = 2); width of vertex (VW) ♂ 0.31–0.32, ♀ 0.32–0.33 (n = 2); length of antenna (AL) ♂ 0.78–0.79, ♀ 0.81–0.85 (n = 2); length of fore wing ♂ 2.27–2.28, ♀ 2.38–2.57 (n = 2); width of fore wing ♂ 0.83–0.86, ♀ 0.85–0.96 (n = 2); length of vein Rs ♂ 0.91–0.99, ♀ 1.00–1.08 (n = 2); length of vein M (M) ♂ 1.11–1.12, ♀ 1.15–1.24 (n = 2); length of vein M1+2 (M1) ♂ 0.44–0.48, ♀ 0.54–0.56 (n = 2); marginal width of cell m1 ♂ 0.28–0.32, ♀ 0.38 (n = 2); marginal width of cell cu1 ♂ 0.40–0.42, ♀ 0.42–0.44 (n = 2); length of vein Cu1b ♂ 0.23–0.25, ♀ 0.21–0.25 (n = 2); length (height) of proctiger (PL) ♂ 0.15–0.20; length of paramere ♂ 0.11–0.13; length of proximal aedeagal segment ♂ 0.17 (n = 1); length of distal aedeagal segment ♂ 0.16 (n = 1); length of proctiger (PL) ♀ 0.30–0.51; length of circum-anal ring (CL) ♀ 0.10–0.13; length of subgenital plate (SL) ♀ 0.29–0.34.

Triozaalifumosa. 11 lateral habitus of female 12 lateral habitus of male 13 dorsal habitus of male 14 dorsal habitus of female 15 head of female, dorsal view 16 head of male, dorsal view 17 wing of male 18 mesotibia of male 19 terminalia of female, lateral view of left side 20 terminalia of male, lateral view of left side. Abbreviations: aed = aedeagus, par = paramere, ptg = proctiger, sgp = subgenital plate. Scale bars: 1 mm (11–17); 0.5 mm (18); 0.25 mm (19, 20).

Description.

This psyllid can be identified by the following combination of characters: habitus as in Figures 11–14, with a dark brown colour, fore wings with an infuscate spot in the apical costal cell as in Figures 13, 17, female proctiger short and bearing setae on the subgenital plate (Figure 19); male parameres elongate, slightly back-turned apically and bearing setae (Figure 20). Both this species and T.alipellucida Klyver, 1932, were described from material collected on Metrosideroscollina. The evenly dark colouration of the dorsal surface and head, the presence of an infuscate spot in the apical costal cell (c+sc), the rounded but elongated shape of the aedeagus, the elongated shape of the male proctiger and the slightly back-turned parameres lead us to place it in T.alifumosa. Triozaalipellucida differs from T.alifumosa by most specimens having a wide lighter brown stripe on the pronotum, not having an infuscate spot at the base of the forewing, and for a shorter male proctiger associated with parameres that are not as back-turned. The morphological distinction between T.alifumosa and T.zimmermani appears more immediate, with the latter presenting light stripes dorsally on a dark brown abdomen and having hyaline wings without any dark spot in the cell c+sc (Tuthill 1942).

Wings, schematic. 22Leptynopterasulfurea (after Crawford 1919) 23Syntomozatahuata (from slide-mounted Rarotonga specimen) 24Triozacf.zimmermani (from photograph of Rarotonga specimen by G. McCormack) 25Heteropsyllacubana (after Tuthill 1959) 26Triozaalifumosa (from slide-mounted Rarotonga specimen) 27Triozazimmermani (after Tuthill 1942) 28Mesohomotomahibisci (after Froggatt 1901) 29Triozavitiensis (after Klyver 1932). Scale bar: 1 mm.

CrawfordDL (1919) The jumping plant lice of the Palaeotropics and the South Pacific Islands – Family Psyllidae, or Chermidae, Homoptera.Philippine Journal of Science15: 139207. https://doi.org/10.5962/bhl.part.11765TuthillLD (1942) Psyllidae from Rapa, the Caroline, Society, and Austral Islands (Homoptera). Occasional Papers of Bernice P.Bishop Museum, Honolulu, Hawaii17(6): 7178.FroggattWW (1901) Australian Psyllidae. Part II.Proceedings of the Linnean Society of New South Wales26: 242298.KlyverFD (1932) Anomotergatahuata, new genus and new species, and other Chermidae from the Marquesas. Bulletin of the B.H.P.Bishop Museum98: 93101.