Lobosarima lobata, Constant & Pham, 2025

Lobosarima lobata gen. et sp. nov.

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Figs 37–40

Diagnosis

Lobosarima lobata gen. et sp. nov. is the only species in the genus Lobosarima gen. nov. The characters of the male terminalia are probably relevant diagnostic features to recognize the species, e.g., the oboval, apically truncate anal tube in dorsal view, the shape of the gonostyli, including the capitulum in lateral and caudal view and the size and shape (curvature) of the lateroventral processes of the aedeagus ( Figs 39, 40A–H).

Differential diagnosis

The most similar species belong to the genera Caimocus gen. nov., Duplexissus Wang, Zhang & Bourgoin, 2019 , Eusarima Yang, 1994 , Jagannata Distant, 1906 and Parasarima Yang, 1994 which can be separated by the characters given for the genus Lobosarima gen. nov.

Etymology

The species epithet ‘ lobatus ’ is a Latin adjective meaning ‘lobed’, and it refers to the basal lobe on the periandrium.

Type material

Holotype

VIETNAM • 1 ♂; Thừa Thiên-Huế Province, Phong Dien District; 16°30′27″ N, 107°16′05″ E; 350– 400 m a.s.l.; 23 May 2023; J. Constant and L. Semeraro leg.; VNMN.

GoogleMaps

Paratypes

VIETNAM – Da Nang Province • 1 ♂; Ba Na-Nui Chua Nature Reserve ; 16°00′ N, 108°01′ E; 16–19 Jul. 2017; J. Constant and J. Bresseel leg.; GTI Project; I.G.: 33.498; RBINS. – Thừa Thiên-Huế Province • 1 ♂; same data as for holotype; VNMN GoogleMaps • 1 ♂; Bach Ma National Park ; 16°11′44″ N, 107°50′44″ E; 1200–1300 m a.s.l.; 22 May 2023; J. Constant and L. Semeraro leg.; roadside; I.G.: 34.640; RBINS GoogleMaps .

GoogleMaps

Description

MEASUREMENTS AND RATIOS. LT: ♂ (n = 3): 5.8 mm (5.5–6.1); LT/ BB = 2.21; LTg/BTg = 2.39; LW/BW = 1.23; BV/LV = 1.93; LF/BF = 0.87.

HEAD ( Fig. 37A–E). Vertex brown, paler in posterior portion, with weak, pale yellowish median carina; 1.9 × as broad as long in midline; weakly concave with anterior margin forming widely obtuse angle and posterior one rather deeply concave; all margins moderately carinate. Frons variegated brown, somewhat paler in large ventral portion; distinctly darker dorsally, between peridiscal carina and dorsal margin; weakly convex, narrowly visible from above, about 1.1–1.2 × as wide as long in midline, smooth with distinct complete median carina extending down to basal portion of clypeus, and peridiscal carina distinct in dorsal portion of frons; few yellowish tubercles between peridiscal carina and lateral margin; dorsal margin weakly concave. Genae yellow, washed with brown before eye and antenna; anteroventral angle of genae not projecting anteriad. Clypeus triangular, convex, smooth; anteclypeus yellow-brown basally, darker towards apex; postclypeus black. Labium yellow-brown with last segment longer than broad, shorter than penultimate. Antennae dark brown with scape short, ring-shaped, and barrel-shaped pedicel turning yellowish dorsally.

THORAX ( Fig. 37A, C–E). Pronotum dark brown with anterior portion paler (sometimes narrowly darker on anterior angle), with paler median carina and yellowish tubercles in lateral fields and along anterior margin; subtriangular, projecting anteriorly in rounded angle, smooth with anterior margin distinctly carinate and pair of impressed points on each side of median line; lateral fields very narrow behind eyes; paranotal lobes yellowish brown with distinct darker band along lateral margin containing yellowish tubercles, and with posteroventral angle rounded. Mesonotum brown with carinae, scutellum and 2–3 tubercles in angles, yellowish; subtriangular with posterolateral margins slightly incurved, smooth, weakly convex with distinct median and sublateral carinae; shallow depression before scutellum.

TEGMINA ( Figs 37A–D, 38A–B). Dark brown with paler poorly defined median band and apical portion; main veins more or less concolourous, elevated, and cross-veins weakly raised and generally paler than background; distinctly convex, elongate, about 2.4 × as long as wide; costal margin broadly rounded laterad around basal 2 /5; apical margin rounded; distinct lateral hump including vein ScP+RA slightly after basal 1 /5, hiding costal margin in dorsal aspect; costal margin hidden by vein RP in distal 2 /5, in dorsal view; no distinct epipleuron; clavus closed, reaching about 4 /5 of tegmen length. Venation as in genus description.

HIND WINGS. Blackish brown, turning slightly darker in distal portion and with paler areas along proximal portion of vein MP, around moderately deep indentation between ScP-R-MP-Cu and Pcu-A1 lobes and along margin of A2 lobe; veins generally darker than background; well developed, with three distinct lobes ( Sarimini type) more or less equal in width. Venation as in genus description.

LEGS ( Figs 37A–E, 38C–D). Yellowish brown, paler than tegmina; apex of pro- and mesotibiae, distal portion of metafemora and basal portion of metatibiae darker; all spines of posterior legs black apically. Anterior and median legs slightly flattened dorsoventrally with tibiae more slender than corresponding femora; posteroventral margin of pro- and mesofemora with row of minute teeth; pro- and mesotarsi rather elongate. Metatibiae with two lateral spines in distal half and six apical spines. Metatarsi rather short with first segment about as long as combined length of remaining segments. First metatarsomere with two latero-apical and six intermediate spines arranged in arc. Metatibiotarsal formula: (2) 6/ 8/ 2.

ABDOMEN ( Fig. 37B). Pale brown with median area irregularly darker.

MALE TERMINALIA ( Figs 39–40). Pygofer ( Py – Fig. 39A–D) short, about 2.4 × as high as long at midheight in lateral view, with posterior margin broadly rounded in lateral view (weakly sinuate in ventral portion); in caudal view oval (sides subparallel), 1.4 × as high as wide; deeply notched dorsally. Gonostyli ( G – Fig. 39A–D) rather massive, moderately convex, with posterior portion roundly projecting caudad into a posterior lobe in lateral view forming a rounded, nearly right angle at base of capitulum; anterodorsal margin oblique, then upcurved at base of capitulum, ventral margin nearly straight; capitulum ( ca – Fig. 39A–C) elongate, strongly projecting, regularly curved, anterodorsad and with poorly distinct neck, digitiform in lateral view, falcate with inner margin rounded in caudal view, and with rather small lateral tooth distinctly downcurved. Anal tube ( An – Fig. 39A–D) moderately elongate and rather wide, dorsoventrally flattened, oboval/ subrectangular, apically truncate, slightly concave, in dorsal view, about 2.2 × as long as wide and with anal opening in basal ⅓; in lateral view abruptly narrowing at anal opening and weakly downcurved. Aedeagus ( Figs 39E–L, 40) symmetrical, elongate, more or less evenly curved posterodorsad in lateral view, with pair of distinct basal lobes ( bl – Figs 39E, G–K, 40A–E) dorsally. Ventral lobe of periandrium ( vl – Figs 39E–L, 40A–E) laminate, spatulate, evenly constricted in middle, apically roundly truncate, and wider basally than dorsal lobe. Dorsal lobe of periandrium ( dl – Figs 39E–L, 40A–E) with sides sinuate in dorsal view, apical margin rounded and with lateral margins downcurved in large middle portion; strong ventral tooth around 3 / 5 of length, apically curved cephalad; large gap between dorsal and ventral lobes in proximal portion, in lateral view. Aedeagus (sensu stricto, ae – Figs 39G, J–L, 40F–H) elongate, deeply bifid, each shaft roundly tapering apically in dorsal view; pair of elongate lateroventral processes ( lvp – Figs 39E–L, 40F–H) arising anteapically, anterodorsally curved in lateral view and reaching basal 1 /5 of aedeagus, sinuate in dorsal view; at rest, processes more or less conceiled between lateral expansion of dorsal lobe and basal lobes of the periandrium. Connective ( co – Fig. 39G) well developed, corpus connective long, weakly curved in lateral view, tectiductus ( te – Fig. 39G) well developed, conical with anteroventral apodemes and wide anterior foramen.

Biology

Lobosarima lobata gen. et sp. nov. was collected in the months of May and July at altitudes between 350 and 1300 m a.s.l., in moist evergreen tropical forest. The specimens were sitting on small branches and leaves, on lower vegetation, bushes and trees. In Bach Ma National Park, it was found at the following collecting site/habitats ( Constant & Pham 2025a: fig. 2a): “roadside” ( Constant & Pham 2025a: figs 2a(4), 4a).

Distribution

Vietnam: Thừa Thiên-Huế Province, Bach Ma National Park and Phong Dien District, and Da Nang Province, Ba Na-Nui Chua Nature Reserve ( Fig. 40I).