Anomocephala unica Tuthill, 1942

Anomocephala unica Tuthill, 1942 View in CoL

( Figs 3D–3E, 3O–3P View FIGURE 3 , 4D–4F View FIGURE 4 )

Anomocephala unica Tuthill, 1942: 75 View in CoL

Adult colour and structure. General colour dark brown, head and thorax darker, somewhat paler abdomen, apical metatarsus dark brown; forewing clear in males (unknown in females) ( Fig. 3D View FIGURE 3 ). Genal processes long and slender, approximately same length as vertex length (ratio VL:GC 1.00), initially contiguous basally, becoming slightly divergent towards apices. Antenna incomplete in specimen at hand (segment 3 length: 0.47). Metacoxa with large sized meracanthus, base of metatibia with cluster of genual spines, apex expanded, bearing 3 (1+2) sclerotized apical spurs with single spur stalked, and the pair of spurs distinctly conjoined ( Figs 3O, 3P View FIGURE 3 ). Forewing long (ratio WL:HW> 4.5) membrane surface spinules sparsely distributed, forewing apex acute ( Fig. 3D View FIGURE 3 ). Hindwing relatively short, less than 0.7 times forewing length, apex narrowly rounded ( Fig. 3E View FIGURE 3 ). Male terminalia with subgenital plate angled posteriorly ( Fig. 4D View FIGURE 4 ); proctiger short, slightly expanded medially towards posterior, without posterior lobes basally ( Fig. 4D View FIGURE 4 ); paramere moderately long and broad, curving slightly towards posterior, with posterior margin narrowed and bearing several long stout setae, apex bluntly rounded, with simple setae shorter on exterior and longer on interior surfaces ( Figs 4A, 4B View FIGURE 4 ); distal aedeagus segment relatively long (ratio PL:AEL <1.3) apex with large bulbous head. Female unknown.

Adult measurements (mm) and ratios. ( 1 male), [ 1 male illustrated by Tuthill, 1942]. WL: 3.52; WW: 1.14; HW: 0.74; AL: missing; PB: 0.09; WL:WW: 3.09[–3.13]; WL:RsL: [1.97–]2.15; CUR: 1.67[–1.69]; MR: 0.56; HM: HCU: 2.21[–2.42]; HW:VW: 1.85; VL:VW: 0.58; VL:GC: 1.00; WL:HW: 4.76; HW:HT: 0.97; HT:HF: 1.36. Male terminalia: MP: 0.27; PL: 0.31; AEL: 0.27; PL:HW: 0.42; MP:PL: 0.87; PL:AEL: 1.15; AEL:AELH: 2.45; PL:SH: 1.24.

Immature. Unknown.

Egg. Unknown.

Host plant. Probably Metrosideros collina . No immatures were collected, but one of the two known specimens, as well as the majority of adult specimens of the sister species, A. rosiegeorgeorum sp. nov., were collected from this plant.

Note. Antenna incomplete in specimen at hand, but Tuthill (1942) describes antenna as long, and almost 3 times head width, which would make the antenna considerably longer than in A. rosiegeorgeorum , which is only ~1.5 times head width. However, the relative length of antennal segment 3 (which is present) suggests that the difference in antennal length is likely not that great between the two species. The male forewing in Fig. 3D View FIGURE 3 has an aberrant vein off cell cu 1 which has partly distorted the shape of cell cu 1, and possibly ratios CUR and HM:HCU reported here. Mainly for this reason, ratios were also derived from the forewing illustration in Tuthill (1942).

Comment. This species is known from only two male specimens, one collected in 1934 ( Tuthill 1942) and the other in 2004 (reported here); the female and immatures remain unrecorded.

Systematics. This species was included in the mitogenome analysis of Percy et al. (2018) (as “DP1.idba.219_ circ_ Triozidae _ Anomocephala_unica ”). See systematics section under Anomocephala , A. rosiegeorgeorum and Discussion.

Genetic resources. Genbank: KY293698 View Materials ( COI), KY294177 View Materials (cytB) .

Distribution. Only known from Mt. Perahu on Rapa island, Austral Islands, French Polynesia.

Material examined. 1 male (slide mounted), Mt. Perahu , north ridge, 600 m, ex Metrosideros , 17 Dec. 2004, “ECAunica”, E. Claridge leg. ( DMPC) .