Clivina collaricrenata, Balkenohl, 2025

Clivina collaricrenata sp. nov.

( Figs 4 View FIGURES 3–14 , 39 View FIGURES 38–52 , 74 View FIGURES 73–84 )

Type material. Holotype: ♂, with labels and data: white, black printed “S-VIETNAM Nam Cat Tien Nat.Park 1. – 15. 5. 1994 Pacholatko & Dembicky” ( CADW).

Paratype: 1 ♂, same data as holotype ( CADW) .

Description. Measurements. Body length 6.05 / 6.14 mm, width 1.91 / 1.96 mm, ratio L/W of pronotum 0.84 / 0.86, ratio L/W of elytra 1.74 / 1.76. Colour glossy, piceous. Supraantennal plate indistinctly brightened at margin, pronotum anteriorly to anterior transverse line fuscous. Antennae, mouthparts, intermediate and hind legs fuscous.

Head about a quarter narrower than pronotum. Clypeus nearly straight anteriorly, with its lateral teeth slightly projecting; wing of moderate size, slightly less projecting anteriorly than clypeus, distinctly separated from clypeus by notch; supraantennal plate convex laterally; clypeus, wing, and supraantennal plate reflexed margined. Supraantennal plate extended up to mid-eye level, ending at mid-eye level as moderately blunt knob, separated from wing by distinct notch, separated from supraorbital carina by sharp furrow. Clypeus transverse, slightly convex, separated from frons by flat furrow. Frons moderately convex, with central pore at middle, with scattered small punctures.Supraantennal plate separated from clypeus by sharp and from frons by moderately wide furrow continuing posteriorly up to mid-eye level. With blunt distinct supraorbital carina at posterior half of eye. With two supraorbital setigerous punctures situated at mid-eye level and at gena-level. Neck constriction developed by punctures and distinct step. Eye convex, projecting laterally but not hemispherical. Gena distinct, enclosing eye posteriorly like a band. Antenna moderately long, just not reaching basal channel of pronotum, antennomeres four to ten subelongate (L/W around 1.18). Labrum slightly undulate, nearly straight, isodiametrically reticulated, seven-setose. Mandible of moderate size. Mentum with lateral lobe flattened, rectangular, reflexed margined, isodiametrically reticulated, median tooth hollowed out, as high as lobes.

Pronotum ( Fig. 39 View FIGURES 38–52 ) with disk slightly convex in lateral view, in frontal view flattened at median line, moderately convex laterally. Quadrate, distinctly wider than long. Anterior margin nearly straight. Reflexed lateral margin conspicuously crenate, regularly moderately convex, widest at middle; anterior angle rounded-off, slightly retracted; posterior angle rounded, marked by anteriorly pointed tooth. Lateral channel wide, foveolate, reticulated, basal part of lateral margin from posterior angle to flange of base slanted with angle of less than 20°, convex, flange short but distinct, basal channel moderately developed, basal carina sharp. Median line crenulated, joining anterior transverse line and base; anterior transverse line narrow, complete. Surface with microscopic punctures, with scattered medium sized punctures, with rough transverse wrinkles laterally and basally, base isodiametrically reticulated.

Elytron ( Fig. 4 View FIGURES 3–14 ) with disk slightly flattened in anterior half in lateral view, regularly convex in frontal view. Outline elongated, distinctly less than twice as long as wide, with maximum width slightly behind middle. Humerus distinct, formed by lateral margin which joins stria five laterally. Reflexed lateral margin indistinctly crenulated posterior humerus. Lateral channel moderately wide. Scutellar striole of moderate length, distinct; with distinct setigerous puncture at base of first stria, with tubercle at base of third interval. Striae moderately deep, with indistinct punctures, one to four free at base, five and six joining at humerus, seven shortened behind humerus, striae one and two running up to apex, three and four, and five and six joining apically. Intervals moderately convex, eight carinate apically, seven at apex with very short step-like carina. Third interval with four setigerous punctures adjoining third stria. Surface of intervals smooth and glossy on disk, with distinct isodiametric reticulation at base, at apical fifth, and on interval seven and eight.

Hind wing fully developed.

Lower surface. Proepisternum with distinct isodiametric reticulation, with sharp transverse wrinkles. Sternites of abdomen with isodiametric reticulation, slightly shingle-like at middle. Abdominal sternum VII with the two anal setigerous punctures widely separated, at middle slightly projecting posteriorly where it is flattened, with narrow marginal furrow at middle. Legs. Protibia with three sharp spines of moderate length and a small spine basally, distinctly sulcate dorsally, movable spur moderately arcuate, surface with longitudinal reticulation. Mesotibia with distinct and moderately long protuberance preapically with acuminate apex and with its seta inserted laterally, with eight setae furnished tubercles above protuberance, the apical four ones sharp, with few fine setae at the inner side. Front leg with tarsomeres slightly widened, first tarsomere elongated, with carina baso-laterally, laterally with acute tubercle furnished with three short setae.

Male genitalia ( Fig. 74 View FIGURES 73–84 ). Median lobe moderately and regularly convex at middle, indistinctly curved at apical lamella, apical lamella with somewhat flattened regularly acuminated lamella. Parameres moderately slender, acuminated and slightly distorted in apical third, apex with three medium sized setae.

Female gonocoxites and epipleurite unknown.

Variation. Among the two specimens, the conspicuous crenation at the lateral margin of the pronotum varies in intensity. The labrum is more or less straight.

Distribution. Known from the Nam Cat Tien National Park in Vietnam.

Diagnosis. A medium sized piceous species with square pronotum and interval seven and eight of the elytron reticulated. It differs mainly from all the other species with a square pronotum by the unique extraordinarily crenated lateral margin of the pronotum.

Etymology. The name refers to the pronotum (in Latin collaris) which lateral margin is conspicuously crenated

(in Latin crenatus). The combination is used in the feminine form (crenata).