Tenasserimacris Dawwrueng, Storozhenko et Vitheepradit, 2025

Dawwrueng, Pattarawich, Storozhenko, Sergey Yu. & Vitheepradit, Akekawat, 2025, A new genus of grasshoppers (Orthoptera: Acrididae: Spathosterninae) from Thailand, Zootaxa 5633 (3), pp. 564-572 : 565-569

publication ID	https://doi.org/10.11646/zootaxa.5633.3.9
publication LSID	lsid:zoobank.org:pub:109633F7-5589-4F92-85C8-FB5C0ABB192D
DOI	https://doi.org/10.5281/zenodo.15436315
persistent identifier	https://treatment.plazi.org/id/03C00C06-FF82-1221-FF6E-30F5FCE5F808
treatment provided by	Plazi
scientific name	Tenasserimacris Dawwrueng, Storozhenko et Vitheepradit
status	gen. nov.

Treatment

Genus Tenasserimacris Dawwrueng, Storozhenko et Vitheepradit , gen. nov.

Type species: Tenasserimacris punctata sp. nov., here designated.

Description. Male. Body elongated. Head slightly shorter than the pronotum ( Figs. 1A–D View FIGURE 1 ). Frons and genae coarsely punctured ( Figs. 1C, E View FIGURE 1 ). Face in profile reclinate ( Figs. 1A, C View FIGURE 1 ). Frontal ridge distinct to nearby the edge of clypeus, deeply sulcate between the antennae, slightly narrowed near median ocellus ( Fig. 1E View FIGURE 1 ). Vertex between eyes distinctly broader than maximal width of frontal ridge. Fastigium of vertex punctured, slightly broader than long, apex rounded in dorsal view; foveolae absent ( Figs. 1C–D View FIGURE 1 ). Eyes large, almost oval. Antennae 22-segmented, slightly surpassing the posterior margin of pronotum. Pronotum punctured, crossed by three transverse furrows, almost cylindrical in dorsal view ( Fig. 1D View FIGURE 1 ); median carina present, but low in profile; lateral carinae of pronotum low ( Figs. 1C, D View FIGURE 1 ); prozona 2.0 times as long as metazona; anterior margin of pronotum broadly rounded with shallow excision medially; posterior margin of pronotum rounded, slightly projecting medially ( Fig. 1D View FIGURE 1 ). Prosternal spine small, narrow conical with acute apex ( Fig. 1F View FIGURE 1 ). Mesosternal lobes with internal margin almost straight, mesosternal interspace distinctly narrower than mesosternal lobe ( Fig. 1F View FIGURE 1 ); metasternal lobes fused ( Fig. 1G View FIGURE 1 ). Tegmina developed, touching each other in dorsal view, slightly surpassing 10th abdominal tergite, with small basal dilatation at anterior margin, posterior margin almost straight, narrowing apically, apex rounded, radial area with straight, parallel cross-veins; ( Figs. 1A–B, H View FIGURE 1 ). Hind wings slightly shorter than tegmina ( Fig. 1H View FIGURE 1 ). Hind femora rather slender, 4.2 times as long as their maximal width; dorsal margin coarsely serrate, ventral margin smooth; ventral genicular lobes without spine ( Fig. 1I View FIGURE 1 ). Hind tibiae with 8–9 outer and 10 inner dorsal spines; outer apical dorsal spine present but small ( Figs. 1J–K View FIGURE 1 ). Hind tarsi long, almost reach the half of hind tibiae; third segment without claws slightly longer than basitarsus; arolium large, surpassing apex of claws. Tympanum rather large, oval, covered by tegmina. 7 th and 8 th abdominal sternites with two subparallel rows of hairs; 10 th abdominal tergite with small rounded or indistinct furculae on posterior margin, not raised upward or backward in lateral view ( Figs. 2A–B View FIGURE 2 ); supra-anal plate triangular with shallow median groove, lateral margin with shallow excision near the half of the plate, longer than its width near base, with obtuse rounded apex ( Fig. 2A View FIGURE 2 ). Paraprocts simple. Cerci reaching beyond the supra-anal plate, conical, with obtuse pointed apex, 3.4 times as long as their width near base ( Fig. 2B View FIGURE 2 ). Subgenital plate long, conical in both lateral and dorsal views ( Figs. 2A–B View FIGURE 2 ).

Epiphallus bridge-shaped; bridge narrow, curved anteriorly and not divided ( Fig. 2F View FIGURE 2 ); ancorae large, obtuse triangular; anterior projections obtuse rounded ( Fig. 2F View FIGURE 2 ); posterior projections absent ( Fig. 2F View FIGURE 2 ); lophi of epiphallus large, broadly rounded ( Figs. 2F–G View FIGURE 2 ); oval sclerites small. Cingulum sclerotized, consisting of nearly straight apodemes, its apex slightly bent outward ( Figs. 2C–D View FIGURE 2 ); rami slightly broadened ( Fig. 2D View FIGURE 2 ); zygoma straight, covering the arch of cingulum ( Fig. 2D View FIGURE 2 ). Valves of cingulum long and narrow, apical part divided in two flattened, rounded lobes ( Figs. 2C–D View FIGURE 2 ). Apical valves of penis divided, widened in median part, narrowed apically, distinctly shorter than valves of cingulum ( Figs. 2C, E View FIGURE 2 ); basal and apical penis valves connected by thin flexure.

Female. Similar to male but larger. Head shorter than the pronotum ( Figs. 3A–D View FIGURE 3 ). Head and frons coarsely punctured, shape of frontal ridge as in male. Vertex between eyes distinctly broader than maximal width of frontal ridge. Fastigium of vertex broad; foveolae absent ( Fig. 3D View FIGURE 3 ). Eyes large, almost oval. Antennae 22-segmented, not reaching the posterior margin of pronotum. Pronotum as in male; prozona 2.5–2.6 times as long as metazona; anterior margin of pronotum subtruncate; posterior margin of pronotum nearly truncate with shallow excision on the middle ( Fig. 3D View FIGURE 3 ). Prosternal spine widened from basal part to the median part and narrowing into a short conical and acute apex ( Fig. 3G View FIGURE 3 ). Mesosternal lobes with internal margin convex; mesosternal interspace distinctly narrower than mesosternal lobe; metasternal lobes fused ( Fig. 3F View FIGURE 3 ). Tegmina similar as in male, but broader and shorter than, reached 7th abdominal tergite ( Figs. 3A, H View FIGURE 3 ). Hind femora as in male; ventral genicular lobe without spine ( Fig. 3I View FIGURE 3 ). Hind tibiae with 7 or 8 outer and 10 inner dorsal spines; outer apical dorsal spine present, larger than male ( Figs. 3J–K View FIGURE 3 ). 6 th and 7 th abdominal sternites with two subparallel rows of short hairs. Supra-anal plate triangular with shallow median groove, the middle part with transverse groove, longer than width near base. Cerci short, not reaching the supra-anal plate, conical, with obtuse rounded apex, 2.3–2.5 times as long as their width near base ( Fig. 4A View FIGURE 4 ). Subgenital plate 1.6–1.7 times longer than wide, apical part slightly concave with broadly triangular median process ( Fig. 4B View FIGURE 4 ). Ovipositor short, dorsal valves thicker and longer than ventral valves, dorsal valves with weak serration margin, lower valves with smooth margin, both valves slightly curved upward and downward ( Fig. 4A View FIGURE 4 ).

Diagnosis. New genus is very similar to Beybienkoacris Storozhenko, 2005 from Thailand. The main morphological differences of both genera are provided in Table 1 View TABLE 1 .

Species included. Tenasserimacris punctata sp. nov.

Etymology. The genus name is derived from the locality of type (the Tenasserim Mountain Range) and -acris a common generic name of grasshoppers. Gender feminine.