Lobosarima, Constant & Pham, 2025

Constant, Jérôme & Pham, Hong Thai, 2025, Issid planthoppers from Bach Ma and Phong Dien in Central Vietnam. (III) Tribe Sarimini (Hemiptera: Fulgoromorpha: Issidae), European Journal of Taxonomy 1025, pp. 1-109 : 75-77

Genus Lobosarima gen. nov.

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Type species

Lobosarima lobata gen. et sp. nov., by present designation.

Diagnosis

The genus Lobosarima gen. nov. can be differentiated from all other genera of Sarimini by the following combination of characters: (1) the vertex nearly 2 × as wide as long in dorsal view; (2) the frons with complete median carina, extending down to basal portion of clypeus, and peridiscal carinae only distinct in dorsal portion of frons; (3) the tegmina elongate, about 2.4 × as long as wide, with distinct lateral hump slightly before basal ⅓ hiding costal margin in dorsal aspect, and without distinct epipleuron; (4) the vein ScP of the tegmen long, weakly curved and reaching margin of tegmen around distal 1 / 5 of tegmen length; (5) the first fork of MP and the first fork of CuA at about the same level, around halflength of tegmen; (6) the anal tube moderately elongate and rather wide, dorsoventrally flattened, oboval / subrectangular, apically truncate in dorsal view; (7) the rather massive gonostyli with anterodorsal margin oblique, with capitulum elongate, strongly projecting anterodorsad and with poorly distinct neck, digitiform in lateral view, and falcate in caudal view; (8) the aedeagus with a single pair of elongate, anteapical, anterodorsally curved, lateroventral processes without posterior hook, at rest more or less conceiled by the lateral extension of the dorsal lobe of the periandrium bearing a tooth, and the basal lobe of the periandrium.

Differential diagnosis

The most similar genera are Caimocus gen. nov., Duplexissus Wang, Zhang & Bourgoin, 2019 , Eusarima Yang, 1994 , Jagannata Distant, 1906 , Parasarima Yang, 1994 , and Retirima gen. nov. However, Lobosarima gen. nov. can be separated from all of these genera by the frons with a complete median carina, extending down to the basal portion of the clypeus, the pair of basal dorsolateral lobes of the periandrium, the dorsal lobe of the periandrium showing a ventral hook, and narrower than the ventral lobe basally, the distinct gap between the dorsal and ventral lobes of the periandrium in lateral view.

Additionally, Lobosarima gen. nov. can be separated (1) from Duplexissus (see illustrations in Wang et al. 2019: figs 12–22) by the oblique anterodorsal margin of the gonostyli (distinctly rounded in Duplexissus ) and the dorsal lobe of the periandrium without apical elongate process directed cephalad (process present on dorsal lobe of periandrium of Duplexissus ); (2) from Eusarima (see illustrations in Chan & Yang 1994: fig. 45) by the oblique anterodorsal margin of the gonostyli (distinctly rounded in Eusarima ), the subrectangular anal tube in dorsal aspect (elongate and tapering towards apex in Eusarima ) and the lack of dorsal spinose processes in the apical portion of the dorsal lobe of the periandrium (present in Eusarima ); (3) from Jagannata (see illustrations in Distant 1906: fig. 171) by the transverse vertex, much wider than long in midline, and with anterior margin more or less truncate (vertex slightly longer than wide, and angularly produced anteriorly in Jagannata ); (4) from Caimocus gen. nov. (see Figs 13–22) by the capitulum of the gonostyli anteroposteriorly compressed and falcate (digitiform and tapering towards the apex in Caimocus ); (5) from Parasarima (see illustrations in Chan & Yang 1994: fig. 39) by the complete carina of the frons, reaching slightly beyond frontoclypeal suture (carina visible only in dorsal half of the frons in Parasarima ), and by the posterior portion of the gonostyli forming a distinct rounded lobe (gonostyli without posterior lobe in Parasarima ); (6) from Retirima gen. nov. (see Figs 49–52) by the tegmina without dense network of pale cross-veins (present in Retirima ), the dorsal lobe of the periandrium simple (periandrium with a pair of strong laterodorsal processes arising in proximal portion of the dorsal lobe in Retirima ), and the apex of the dorsal lobe rounded (distinctly acuminate in Retirima ).

Etymology

The genus name is the combination of ‘ lobus ’ (Latin), meaning ‘lobe’, and ‘ Sarima ’, the name of the type genus of the tribe Sarimini . It refers to the basal lobes on the periandrium. Gender feminine.

Description

Medium sized (around 5.5–6.1 mm), very convex, rather elongate and robust-bodied.

COLOUR. Mostly brown.

HEAD. Vertex distinctly broader than long in midline (about 1.9 ×), weakly concave with weak median carina; anterior margin forming a widely obtuse angle, posterior one rather deeply concave; all margins moderately carinate. Frons 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 tubercles between peridiscal carina and lateral margin; maximum breadth slightly under level of antennae; dorsal margin weakly concave. Anteroventral angle of genae not projecting anteriad. Ocelli present, under eye. Clypeus triangular, convex, smooth. Labium with last segment longer than broad, shorter than penultimate. Antennae with scape short, ring-shaped, and barrel-shaped pedicel.

THORAX. Pronotum subtriangular, projecting anteriorly in rounded angle, about 0.63 × as long in midline, as mesonotum; smooth with anterior margin distinctly carinate and pair of impressed points on each side of paler median carina; lateral fields with tubercles, very narrow behind eyes; paranotal lobes with tubercles along external margin, and with posteroventral angle rounded. Mesonotum subtriangular with posterolateral margins slightly incurved, smooth, weakly convex with distinct median and sublateral carinae; shallow depression before scutellum.

TEGMINA. Distinctly convex, elongate, about 2.4 × as long as wide, with longitudinal veins elevated; 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: ScP+R rather short; ScP+RA long, reaching to around distal 1 /5 of tegmen length; RP unforked, long and weakly curved; first fork of MP and CuA veins around midlength of tegmen, MP1 with two terminales; Pcu and A1 fused slightly before halflength of clavus, Pcu+A1 reaching apex of clavus; cross-veins more numerous and more strongly marked along costal margin and in distal half of tegmen.

HIND WINGS. Well developed, with three distinct lobes ( Sarimini type) more or less equal in width; mostly brown. Venation: ScP+R and CuA furcate; MP simple, sinuate; second branch of CuA fused distally with CuP; Pcu and A1 fused on basal half, Pcu unforked and A2 simple; transverse vein between second branch of ScP+R and MP, and between MP and first branch of CuA.

LEGS. Somewhat elongate, slender, with pro- and mesofemora and pro- and mesotibiae slightly flattened dorsoventrally, 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.

MALE TERMINALIA. Pygofer short, about 2.4 × as high as long at midheight in lateral view, with posterior margin broadly rounded in lateral view; in caudal view oval (sides subparallel), 1.4 × as high as wide. Gonostyli rather massive, moderately convex, with posterior portion roundly projecting caudad into a posterior lobe in lateral view and with anterodorsal margin oblique; capitulum elongate, strongly projecting anterodorsad and with poorly distinct neck, digitiform in lateral view, falcate (inner margin rounded) in caudal view and with rather small lateral tooth. Anal tube moderately elongate and rather wide, dorsoventrally flattened, oboval/ subrectangular, apically truncate in dorsal view, about 2.2 × as long as wide and with anal opening in basal ⅓; in lateral view, weakly downcurved. Aedeagus symmetrical, curved posterodorsad in lateral view, with pair of distinct basal lobes dorsally. Ventral lobe of periandrium laminate, spatulate, evenly constricted in middle and wider basally than dorsal lobe. Dorsal lobe of periandrium with sides sinuate in dorsal view and with lateral margins downcurved in large middle portion; large gap between dorsal and ventral lobes in proximal portion, in lateral view. Aedeagus (sensu stricto) elongate, bifid, each shaft roundly tapering apically in dorsal view; pair of elongate lateroventral processes (without posterior hook) arising anteapically, anterodorsally curved in lateral view, sinuate in dorsal view; at rest, processes more or less conceiled between lateral expansion of dorsal lobe and basal lobes of the periandrium. Connective well developed, corpus connective long, weakly curved in lateral view, tectiductus well developed, conical with anteroventral apodemes and wide anterior foramen.

Distribution

Vietnam: Thừa Thiên-Huế Province and Da Nang.

Species included

Lobosarima lobata gen. et sp. nov.