Tsounkranaglenea, Lin & Ge, 2021

Lin, Mei-Ying & Ge, Si-Qin, 2021, Tsounkranaglenea hefferni gen. et sp. nov. from Sabah, Malaysia (Coleoptera Cerambycidae, Lamiinae: Saperdini), Zootaxa 5048 (2), pp. 289-297 : 290

Tsounkranaglenea gen. nov.

Type species: Tsounkranaglenea hefferni sp. nov.

Diagnosis. It is mostly similar to Glenea by the lateral elytral carinae and truncate elytral apex, but can be distinguished by the elongated, bended and rake-shaped sternite VII. In fact, it differs from all other saperdine genera by the peculiar sternite VII in males. It also differs from Paraglenea Bates, 1866 , Heteroglenea Gahan, 1897 (as defined in Lin, Montreuil et al, 2009) and Pareutetrapha Breuning, 1952 by the male claws of fore and hind legs simple instead of appendiculate or bifid and elytral apex truncated with sharp teeth instead of rounded or slightly truncated without sharp teeth. It also differs from Eumecocera Solsky, 1871 and Stenostola Dejean, 1835 by the elytra with lateral carinae and male claws of fore and hind legs simple instead of appendiculate or bifid. The combination of the following characters makes the new genus easily separable from other saperdine genera: prothorax without lateral tubercles, elytra with distinct lateral carinae, elytral apex truncated with long spines at outer angle, male claws with appendiculated tooth only in mesotarsi and female claws all simple, male sternite VII elongated and bended into a rake-shape.

Description. Small-sized (under 15 mm). Head not broader than prothorax. Eyes deeply emarginate, not divided, lower eye lobe much vertically longer than (male) to subequal to (female) gena. Antennae longer than body, in male slightly longer than female, basal segments fringed with sparse setae, scape slightly expanded, second antennomere short, third antennomere always the longest, 4 th antennomere subequal to (female) to slightly longer than (male) scape, 4 th to 10 th slightly and gradually decreasing in length except 11 th being slightly longer than 10 th. Prothorax cylindrical, without lateral tubercles, slightly narrowed around basal fifth. Elytra subparallel, truncated apically, with sharp teeth at both inner and outer angles, each with two distinct lateral carinae starting from the base and combined into apical outer tooth ( Figs 1b , 11b ). Procoxal cavity closed posteriorly ( Fig. 11c ), mesocoxal cavity open to mesepimeron, metanepisternum more than twice as wide anteriorly as posteriorly. Protarsi with first segment expanded in male ( Fig. 1a ), mesotibiae with an oblique groove with setae ( Fig. 1b ), hind femur reaching fifth abdominal segment, hind tarsi with first segment longer than the following two combined. Male claws: only anterior claws of mesotarsi appendiculate with small teeth ( Figs. 4–5 ), posterior claws of mesotarsi without teeth, and claws of pro- and metatarsi simple. Females claws simple ( Figs. 11 a-11b). Male sternite VII elongated and bent into a rake-shape ( Figs. 1–3 ), female sternite VII with a median groove ( Fig. 11c ).

Male terminalia. Apex of male tergite VIII emarginated ( Figs. 6a–6c ). Lateral lobes slender, with a strong tooth at ventral base ( Fig. 8b ); ringed part elbowed in the widest portion, converging; basal piece well-developed and bifurcated ( Fig. 8c ). Median lobe strongly curved, shorter than tegmen, dorsal plate shorter than ventral plate, apex of ventral plate emarginated ( Fig. 9a ). Median foramen not elongated. Endophallus with one band of supporting armature, 4 basal plate-like sclerites, and 3 rod-like sclerites. Ejaculatory duct single. Female terminalia: Setae of sternite VIII dense and long. Spermathecal capsule and gland positioned on apex of spermathecal duct. Spermathecal capsule strongly sclerotized, composed of an apical orb and a long stalk, spiculum ventrale longer than abdomen.

Etymology. The generic name is a combination of a Greek word tsounkrána (τσουγκράνα) and the genus name Glenea . The Greek word “tsounkrána” refers to the shape of sternite VII in male, which looks like a rake. Gender feminine.

Distribution. Malaysia.

Remarks. It is very similar to Glenea ( Breuning, 1956; Breuning, 1958) by the elytral lateral carinae and truncated elytral apex, and the following characters are quite common in Glenea members: endophallus with 4 basal plate-like sclerites ( Lin et al., 2009; Lin, Tavakilian et al., 2009a,b; Lin & Lin, 2011; Lin & Yang, 2011a, b; Lin et al., 2018), and 3 rod-like sclerites ( Lin et al., 2009; Lin, Tavakilian et al., 2009a,b; Lin & Lin, 2011; Lin & Yang, 2011a, b; Lin & Dai, 2012; Lin, 2013); spermathecal capsule strongly sclerotized, composed of an apical orb and a long stalk ( Lin et al., 2009; Lin, Tavakilian et al., 2009b; Lin & Yang, 2011a, b; Lin & Dai, 2012). We separate it from Glenea based on the following reasons.: 1) Glenea is heterogeneous ( Lin, Montreuil et al., 2009;), even though outer characters are very similar ( Lin & Tavakilian, 2012), this peculiar species does not match with any type species of the subgenera; 2) Though most of characters can be found in the previous Glenea members, and the peculiar male sternite might not be suitable for generic level, but with only one band of supporting armature and the emarginated apex of the ventral plate of the median lobe, this convinced the authors to make a new genus. Most members of Saperdini have zero or two bands of supporting armature, rounded to the pointed apex of the ventral plate of the median lobe ( Lin et al., 2009; Lin, Tavakilian et al., 2009a, b; Lin & Yang, 2011a, b; Lin & Dai, 2012; Lin, 2013; Lin et al., 2018). 3) Although the sexual dimorphism (on pubescence markings) referred to the subgenus Glenea (Acutoglenea) Breuning, 1958 , and the dark integument referred especially to G. (A.) versuta basaloides Breuning 1958, G. (A.) versuta maura Pascoe, 1867, it can not be included in the subgenus Acutoglenea because of the non-simple male claws and very different male terminalia (based on the first author’s unpublished data). Besides, the type species Glenea (Acutoglenea) acuta (Fabricius, 1801) has a stouter female, with elytral length less than twice basal width, fourth antennomere much shorter than scape, which are very different from the new taxon herein described. 4) We have checked the subgenus Glenea (Lineatoglenea) Breuning, 1950 , which is represented by a unique type species Glenea (Lineatoglenea) lineatopunctata Breuning, 1950 from Malaysian Borneo. There are no images available, and we did not have an opportunity to examine the type specimen which should be deposited in University of Malaysia, Sarawak ( Breuning, 1950a). Based on the original description, it shares with the new taxon by antennae longer than body, similar antennomere ratio, pronotum and elytra, however it differs from the new taxon by the fifth male abdominal segment provided at the end with a short median longitudinal ridge. 5) We have checked the subgenus Glenea (Spiniglenea) Breuning, 1958 , which is represented by a unique type species Glenea (Spiniglenea) spinosipennis Breuning, 1958 from Malaysian Borneo. It also has no images available, and we did not have an opportunity to examine the type specimen which should be deposited in University of Malaysia, Sarawak ( Breuning, 1958b). Based on the original description, it is difficult to separated it from the new taxon on genus level, since it was based only on a female. However, it is surely not the same species. 6) We compared the new taxon with Glenea (Metaglenea) Breuning, 1956 , which is represented by a species from Sumatra, and Glenea (Porphyrioglenea) Breuning, 1956 , which is represented by a species from West Malaysia and Sabah, East Malaysia. They can be easily distinguished from the new taxon by the very close antennal tubercles, shorter and stouter antennae. Glenea (Pseudotanylecta) Breuning, 1956 , Glenea (Subgrossoglenea) Breuning, 1956 , Glenea (Tanylecta) Pascoe, 1866 also from Malaysia and Indonesia, can be separated by the close and protruding antennal tubercles. 7) Glenea (Poeciloglenea) Aurivillius, 1920 , Glenea (Punctoglenea) Breuning, 1956 , Glenea (Reginoglenea) Breuning, 1956 , Glenea (Rubroglenea) Breuning, 1956 , Glenea (Rufoglenea) Breuning, 1956 , Glenea (Stiroglenea) Aurivillius, 1920 , Glenea (Vanikoroglenea) Breuning, 1956 , Glenea (Vittiglenea) Breuning, 1956 , Glenea (Volumnia) Thomson, 1860 and all other subgenera have been studied by the first author, and none of them are suitable for the new taxon. 8) The new taxon differs from Glenea (Lobunguiglenea) Lin & Tavakilian, 2014 by the male claws with only anterior claw of mesotarsus appendiculate with small lobe in inner side, instead of all claws appenciculated in outer sides, and genitalia with median lobe strongly curved, apex of ventral plate emarginated, instead of genitalia with median lobe slightly curved, apex of ventral plate pointed.

Figures

FIGURES 1-5. Tsounkranaglenea hefferni gen. et sp. nov. 1. Holotype, male. 2-5. Paratype, female. 2b-d, showing abdomen especially the 7th and 8th segment; 3, abdomen with genitalia removed; 4, claw of left middle tarsus; 5, claw of right middle tarsus. a, dorsal view; 4a, dorsa-lateral view; b, lateral view; 4b, back view; 2c, lateral view; 3c, ventral view; d, back view; e, frontal view. 1a, 1b, 2a: scale bar 4.0 mm; 3a-3c: scale bar 2.0 mm; others not to scale.

FIGURES 11–14. Females of Tsounkranaglenea hefferni gen. et sp. nov. 11, paratype, dissected; 12, paratype, just emerged, showing the erected setae along suture; a, dorsal view; b, lateral view; c, ventral view; d, frontal view. 13-14. Female genitalia. 11-12, scale bar 4.0 mm; 13-14, scale bar 1.0 mm.

FIGURES 6–10. Terminalia of Tsounkranaglenea hefferni gen. et sp. nov. 6, Tergite VIII; 7, sternites VIII & IX; 8. Tegmen; 9, Median lobe; 10, endophallus, showing a band of supporting armature, basal plate-like sclerites and rod-like sclerites. a, Ventral view; b, Lateral view, 7b, dorsal view; c, dorsal view; d, lateral view. 7-10, Scale bar 0.1 mm; 6, scale bar 1.0 mm.