Orthoneolepta, Hazmi & Wagner, 2013

Hazmi, Izfa Riza & Wagner, Thomas, 2013, Revision Of Neolepta Jacoby, 1884 And Related Galerucines From The Oriental Region, Including Descriptions Of Two New Genera (Coleoptera: Chrysomelidae: Galerucinae), Raffles Bulletin of Zoology 61 (1), pp. 73-95 : 88-90

Orthoneolepta , new genus

Type species. — Neolepta fulvipennis Jacoby, 1884: 222–223 ; herein designated.

Etymology. — Combination of ortho (latin: straight to) and Neolepta ; gender: feminine.

Total length. — 4.50–5.75 mm (mean: 5.12 mm)

Head. — Brown to reddish-brown. Impunctate, with significant transverse impression between posterior third of eyes. Eyes small, convex. Labial palpi slender and maxillary palpi enlarged ( Fig. 37a ), occasionally dark brown. Labrum and mandibulae contrasting dark brown. Antennae elongated, extended to the apical third of the elytra ( Figs. 38 , 45 ), the median antennomeres significantly broadened. Antennae entirely black and only the first basal antennomeres usually contrasting reddish-brown. First antennomere club shaped; second and third antennomere varied from a bit shorter to more or less the same length; ratio length of second to third antennomere 0.60–1.00 (mean: 0.79); ratio length of third to fourth antennomere 0.30–0.50 (mean: 0.42; Figs. 39 , 46 ).

Thorax. — Pronotum transverse, broad, with a transverse depression beyond the middle of the base, anterior margin concave and posterior margin broadly rounded ( Figs. 39 , 46 ). Pronotum brown to reddish-brown. Pronotal width 1.30–1.80 mm (mean: 1.56 mm), ratio length to width 0.59–0.65 (mean: 0.62). Scutellum triangular, impunctate, reddish-brown to black. Procoxal cavities nearly closed ( Fig. 37b ). Meso- and metathorax reddish-brown to black. Metasternum broad ( Fig. 37c ). Elytral strongly punctuated, punctuation partly arranged in longitudinal rows, entirely yellow to reddish-brown and in N. banggiensis , sutural and lateral margin narrowly black. Elytral length 3.50–4.80 mm (mean: 4.16 mm), maximal width of both elytra together 2.50–3.40 mm (mean: 2.92 mm), ratio of maximal width of both elytra together to length of elytra 0.67–0.72 (mean: 0.70). Alae fully developed ( Fig. 37d ). Legs long and slender, basi-metatarsus elongated ( Fig. 37 e–g), blackish throughout and in O. fulvipennis , coxa and trochanter contrasting brown to reddish-brown. In particular tibia with dense and fine setae.

Abdomen. — Pale yellow to red. Last visible sternite in females rounded at apex ( Fig. 37h ), and in males with two deep, parallel-sided incisions ( Fig. 37i ).

Male genitalia. — The median lobe is symmetrical, parallelsided at base and usually narrowed towards apex. Apically incised. Tectum long, broad at base and became pointed at apex. As Neolepta , endophallus consist of bundle of laterally arranged long, slender and straight median spiculae. At the bottom of median spiculae, several basal endophallus structure. Sacculus clearly visible ( Figs. 40 , 47 ).

Female genitalia. — Spermatheca with small, slender and elongated nodulus. Middle part long and slightly curved, cornu long and curved ( Figs. 41 , 48 ). Two pairs of bursa sclerites; one spiny and sclerotized and the other pair hooked shaped, attached together ( Figs. 42 , 49 ).

Distribution. — Restricted to the Malaysian Peninsula, Sumatra and Borneo ( Fig. 43 ).

Diagnosis. — Orthoneolepta , new genus are medium sized (4.50–5.75 mm), dorsoventrally bulged galerucine with

strongly elongated basi-metatarsus and transverse depression on pronotum. The punctuation on elytra is coarser than that of pronotum. The dorsal colouration is yellow to reddishbrown, and in certain species, sutural and lateral margin of elytra are narrowly black ( Figs. 38 , 45 ). As the genotype of this genus O. fulvipennis are transferred from Neolepta , most of the character of this genus resembles to Neolepta . The pronotum of both groups are with transverse depression, but it is comparatively less broad (0.59–0.65) in Orthoneolepta , new genus than in Neolepta (0.52–0.60). The second and third antennomere of Orthoneolepta , new genus varied from a bit shorter to more or less the same length (ratio length of second to third antennomere: 0.60–1.00; Figs. 39 , 46 ), about similar to Neolepta , of which the second antennomere is a bit shorter (0.75–0.80; Figs. 3 , 11 ), but in Orthoneolepta , new genus, the fourth to sixth antennomere are significantly widened. The procoxal cavities are nearly closed in both groups ( Figs. 1b , 37b ).

Besides the similarities, the differences in both group can be obtained on the genital characters. The median lobe are incised apically in Orthoneolepta , new genus ( Figs. 40 , 47 ) and not incised in Neolepta and Paraneolepta , new genus ( Figs. 4 , 12 , 19 , 27 , 33 ). The spermatheca are the same shape with Paraneolepta , new genus, but two pairs of bursa sclerites; one spiny and sclerotized and one other pair of hook-shaped occurred in Orthoneolepta , new genus and very characteristic for this group ( Figs. 42 , 49 ).

At the first glance, O. fulvipennis looks very similar to Rubrarcastes sanguinea ( Jacoby, 1892; Hazmi & Wagner, 2010b) with the punctuation coarser and reddish-brown dorsal colouration. Both species can be misidentified at a first glance, but the crucial characters that can distinguish both species are the second and third antennomere of Rubrarcastes (0.43–0.57) are not of the same length as in Orthoneolepta , new genus (0.60–1.00). The median lobes of these two groups are also different—in Orthoneolepta , new genus, they are incised apically and spermathecae are also of different shape.

Figures

Fig. 37. Orthoneolepta fulvipennis (Jacoby, 1884): a, head; b, prothorax; c, meso- and metathorax, ventral view; d, hindwing, right, dorsal view; e, prothoracic; f, mesothoracic; g, metathoracic leg; h, female abdomen; i, male abdomen.

Figs. 38–42. Orthoneolepta fulvipennis (Jacoby, 1884). 38, dorsal colour pattern. 39, antennae: a, male; b, female. 40, median lobe: a, dorsal; b, lateral; c, ventral. 41, three different spermathecae. 42, two pair of bursa sclerites.

Figs. 45–49. Orthoneolepta banggiensis (Mohamedsaid, 1997). 45, dorsal colour pattern. 46, antennae: a, male; b, female. 47, median lobe: a, dorsal; b, lateral; c, ventral. 48, three different spermathecae. 49, two pair of bursa sclerites.

Fig. 43. Distribution of O. fulvipennis (Jacoby, 1884) and O. banggiensis (Mohamedsaid, 1997).

Figs. 2–6. Neolepta sumatrensis (Jacoby, 1884). 2, dorsal colour pattern. 3, antennae: a, male; b, female. 4, Median lobe: a, dorsal; b, lateral; c, ventral. 5, three different spermathecae. 6, two pairs of bursa sclerites. Scale bar = 1 mm.

Figs. 10–14. Neolepta quadriplagiata Jacoby, 1886. 10, dorsal colour pattern. 11, antennae: a, male; b, female; 12, median lobe: a, dorsal; b, lateral; c, ventral. 13, three different spermathecae. 14, two pairs of bursa sclerites.

Fig. 1. Neolepta sumatrensis (Jacoby, 1884): a, head; b, prothorax; c, meso- and metathorax, ventral view; d, hindwing, right, dorsal view; e, prothoracic leg; f, mesothoracic leg; g, metathoracic leg; h, female abdomen; i, male abdomen. Scale bar = 1 mm.

Figs. 17–21. Paraneolepta marginata (Jacoby, 1884). 17, dorsal colour pattern. 18, antennae: a, male; b, female. 19, median lobe: a, dorsal; b, lateral; c, ventral. 20, three different spermathecae. 21, two pairs of bursa sclerites.

Figs. 25–29. Paraneolepta limbella (Baly, 1886). 25, dorsal colour pattern. 26, antennae: a, male; b, female. 27, median lobe: a, dorsal; b, lateral; c, ventral. 28, three different spermathecae. 29, one pair of bursa sclerites.

Figs. 31–35. Paraneolepta imitans (Jacoby, 1894). 31, dorsal colour pattern. 32, antennae: a, female; b, male. 33, median lobe: a, dorsal; b, lateral; c, ventral. 34, three different spermathecae. 35, two pairs of bursa sclerites.