Ctenarytaina daleae Burckhardt, 2020

Burckhardt, Daniel, 2021, On some Ctenarytaina species (Hemiptera, Psylloidea) from Gunung Kinabalu (Malaysia, Sabah), Alpine Entomology 5, pp. 107-113 : 107

Ctenarytaina daleae Burckhardt, 2020

Figs 1 , 4 , 5 , 10-14

Ctenarytaina daleae Burckhardt: Burckhardt et al. (2020: 44), p.p. [description and figures ♂, key]

Type locality.

Malaysia, Sabah, Ranau, Gunung Kinabalu, 6.0428°N, 116.5587°E, 2600 m.

Material examined.

Malaysia: Holotype ♂, Sabah: Ranau, Gunung Kinabalu , 6.0428°N, 116.5587°E, 2600 m, 2.v.1987, Syzygium korthalsianum (D. Burckhardt & I. Löbl) #8751 (MNHG, slide mounted). - Malaysia: 6 ♂, 8 ♀, same but summit trail, 3230 m, Leptospermum sp., 29.iv.1982, Leptospermum scrub (D. Burckhardt) #8277; 10 ♂, 12 ♀, same but 3230 m, Leptospermum recurvum , #8278; 1 ♂, 1 ♀, same but 2600 m, 1.v.1987 (D. Burckhardt & I. Löbl) #8735; 21 ♂, 36 ♀, same but 2600 m, 2.v.1987, Leptospermum recurvum , #8747, #8748, #8749; 6 ♂, 6 ♀, same but 2600 m, 2.v.1987, general sweeping of vegetation, #8752; 2 ♂, 9 ♀, same but 2600 m, 2.v.1987, Leptospermum javanicum , #8753; 12 ♂, 13 ♀, same but 3300 m, 4.v.1987, Leptospermum recurvum , #8756; 4 ♂, 4 ♀, same but below Layang Layang, 2600 m, 2-8.v.1987, interception trap (A. Smetana); 7 ♂, 11 ♀, same but below Laban Rata, 3155 m, 5.v.1987; 1 ♂, 5 ♀, same but Laban Rata, 3200 m, 4-8.v.1987, interception trap; 8 ♂, 7 ♀, same but 3200 m, 9-20.v.1987, interception trap (MHNG, NHMB, dry and slide mounted).

Diagnosis.

Genal processes 0.3 times as long as vertex along mid-line, irregularly rounded anteriorly. Forewing oblong oval, widest in the middle, 2.3-2.7 times as long as broad, broadly rounded apically; vein C+Sc mostly straight, weakly concave in proximal third, cell c+sc narrow. Surface spinules present in all cells, forming cellular pattern; in cell r2 above bifurcation of vein M, the cells are irregularly hexagonal consisting of two indistinct rows of spinules. No extra pore fields developed on abdominal intersegmental membrane. Basal segment of proctiger weakly curved posteriorly, hind margin with a row of stout setae; apical segment 0.2-0.3 times as long as basal segment. Paramere digitiform. Distal segment of aedeagus cuneate. Female terminalia strongly narrowed medially, bearing each an apical process on proctiger and subgenital plate, female proctiger dorsally serrate.

Redescription.

Adult. Colouration. Head and thorax light reddish brown. Vertex with dark brown dot in the middle of either half; genal processes dark brown at base, yellow apically. Antenna light orange brown at base, getting gradually darker from segment 6 to apex which is dark brown or black. Pronotum with each two submedian dark dots and mesopraescutum with each one submedian dark dot along fore margin on either side. Legs yellow; profemora light greyish brown. Forewings light ochreous or amber-coloured, slightly lighter along fore margin; veins concolourous with membrane. Abdomen yellow or orange; base of female proctiger light brown. Younger specimens with less extended dark colour.

Structure.

Conforming to the generic description of Burckhardt et al. (2020). Body length ♂ 1.4-1.5 mm, ♀ 1.5-1.9 mm (6 ♂, 6 ♀). Head deflexed 45° from longitudinal axis of body. Vertex rhomboidal, weakly concave at base; preocular sclerite forming flat tubercule; genal processes 0.3 times as long as vertex along mid-line, irregularly rounded anteriorly, contiguous medially; eyes weakly ‘stalked’ (Fig. 1 ). Antenna 0.6-1.0 times as long as head width. Metatibia 0.5-0.7 times as long as head width, weakly widening to apex, with 5 irregularly spaced apical spurs. Forewing (Fig. 4 ) oblong oval, widest in the middle, 2.3-3.0 times as long as head width, 2.3-2.7 times as long as broad, broadly rounded apically; pterostigma, at base narrower than adjacent part of cell r1, regularly narrowing to apex, ending at apical fifth of wing; vein C+Sc mostly straight, weakly concave in proximal third, cell c+sc narrow; vein Rs almost straight, vein M long, with short, weakly diverging branches, vein Cu1a relatively straight, reaching the wing margin distinctly distal to bifurcation of vein M. Surface spinules present in all cells, forming cellular pattern; in cell r2 above bifurcation of vein M, the cells are irregularly hexagonal consisting of two indistinct rows of spinules (Fig. 5 ). No extra pore fields developed on abdominal intersegmental membrane. Male terminalia as in Figs 10-12 . Proctiger 0.4-0.6 times as long as head width; basal segment, in profile, weakly curved posteriorly, irregularly beset with fine setae, hind margin with a row of stout setae; apical segment tubular, 0.2-0.3 times as long as basal segment. Subgenital plate, in profile, triangular, with almost straight dorsal margin; sparsely beset with short setae. Paramere, in profile, digitiform, almost straight anteriorly, wavy posteriorly, broadly rounded apically; inner face densely coverd in moderately long bristles. Distal portion of aedeagus slender in basal half, widening towards apex which is rounded; sclerotised end tube of ductus ejaculatorius small, weakly curved. Female terminalia as in Fig. 13 . Proctiger 0.8-1.0 times as long as head width, 2.3-3.7 times as long as circumanal ring, cuneate; strongly narrowed medially, bearing an apical process, apical third serrate dorsally, subacute apically; sparsely beset with short setae, with a longitudinal lateral row of slightly longer setae in apical third and 2 longitudinal rows of peg setae near ventral margin in apical half. Subgenital plate 0.7-0.8 times as long as proctiger, in profile, bearing narrow, apically pointed process. Valvulae dorsalis and ventralis straight (Fig. 14 ); valvula lateralis pointed apically.

Measurements in mm (5 ♂, 6 ♀). Head width 0.44-0.58; antenna length 0.34-0.50; forewing length 1.08-1.48; length of male proctiger 0.20-0.24; paramere length 0.16-0.18; length of distal portion of aedeagus 0.10-0.14; female proctiger length 0.42-046.

Fifth instar immature unknown.

Distribution.

Malaysia: Sabah, probably endemic to Gunung Kinabalu.

Host plant, biology and habitat.

Adults were collected in large numbers on Leptospermum javanicum Blume (= L. flavescens auct.) and L. recurvum Hook.f. ( Myrtaceae ) suggesting that these two species constitute hosts. Leptospermum javanicum is widely distributed from Burma and southern Thailand to the Philippines, Malucu and Lesser Sunda Islands, and L. recurvum , is endemic to Gunung Kinabalu ( Thompson 1989). It has been suggested that L. recurvum has split from the former after the last Pleistocene glaciation ( Lee and Lowry 1980). The species occurs as a tree and at high altitudes as prostrate shrub on an outcrop of ultra basic rocks. It is one of the main shrub species of the summit zone above 3200 m altitude ( Cockburn 1978; Corner 1978). A singe male was collected also on Syzygium korthalsianum (Miq.) Miq. ( Myrtaceae ), which is an unlikely host contrary to the statement by Burckhardt et al. (2020).

Comments.

Ctenarytaina daleae is most similar to C. insularis Martoni & Armstrong in the posteriorly weakly lobed male proctiger, the digitiform paramere, the female terminalia, which are strongly narrowed medially and bear each an apical process on the proctiger and subgenital plate as well as the dorsally serrate female proctiger. It differs from the latter in the surface spinules forming rings consisting of two rows of spinules, the distal aedeagal segment which is evenly widening to apex rather than with a slender stalk and inflated apical part, the dorsally less concave female proctiger and the host plant: Leptospermum versus Syzygium .

Ctenarytaina daleae was described based on the male holotype and two female paratypes ( Burckhardt et al. 2020). The examination of a long series of material from the summit region of Gunung Kinabalu collected on Leptospermum spp. shows that the holotype of C. daleae corresponds to the species from Leptospermum but not the females which belong to C. smetanai sp. nov. described below. Ctenarytaina daleae and C. smetanai sp. nov. are similar in the head and forewing structure (Figs 1 , 3 , 4 , 8 ) but differ in the male and female terminalia (Figs 10-14 , 18-20 , 23 , 24 ).

Figures

Figures 1 - 3. Ctenarytaina spp., head, in dorsal view. 1. C. daleae; 2. C. lienhardi sp. nov.; 3. C. smetanai sp. nov.

Figures 4 - 9. Ctenarytaina spp. 4, 6, 8. Forewing; 5, 7, 9. Surface spinules in cell r 2 above bifurcation of vein M. 4, 5. C. daleae; 6, 7. C. lienhardi sp. nov.; 8, 9. C. smetanai sp. nov.

Figures 10 - 24. Ctenarytaina spp., terminalia. 10, 15, 18. Male terminalia, in profile; 11, 16, 19. Distal portion of aedeagus; 12, 17, 20. Inner face of paramere; 13, 21, 23. Female terminalia, in profile; 14, 22, 24. Dorsal and ventral valvulae. 10 - 14 C. daleae; 15 - 17, 21, 22. C. lienhardi sp. nov.; 18 - 20, 23, 24. C. smetanai sp. nov.