Dilatitibialis manaus González & Větrovec, 2021

González, Guillermo & Větrovec, Jaroslav, 2021, New species and records of Neotropical ladybirds (Coleoptera: Coccinellidae), Revista Chilena de Entomología (Rev. Chil. Entomol.) 47 (2), pp. 331-374 : 336-337

Dilatitibialis manaus González & Větrovec , new species

( Figs. 1 m-1w)

Holotype ♂ “ Brasil / Manaus / XII. 1997 / Pumr leg.”, “ ♂ 2034” ( NMP).

Diagnosis. The L-shaped brown disc spot in the anterior half of the elytron allows it to be differentiated from any other species of the genus ( Fig. 1m ).

Description. Color pattern ( Figs. 1 m-1q). Head yellow, including antennae and mouthparts. Pronotum yellow with four brown spots in a semicircle, two basal and two on the disc, the latter triangle-shaped, pointing to the center of the base, and a narrow basal stripe of the same color joining the two basal spots. Scutellar shield brown, with small yellow spot in the center ( Fig. 1m ). Elytra yellow with a brown sutural stripe, somewhat widened around 2/5 of the length; base of elytra with narrow brown band in the margin; a poorly defined and partially interrupted brown lateral border, notorious at apex, and four disc spots isolated from each other and from the borders (2:2); inner anterior spot extends from near the base to more than 1/2 the length, L-shaped, somewhat oblique, with the long branch pointing to the base and the short branch towards the lateral border, the oval humeral spot reaching 2/5 of the length; the last two spots in a transverse line towards two-thirds of the length, sub-squared and somewhat smaller than the previous ones. Epipleuron yellow. Ventral side yellow with exception of head and prosternum which are dark brown, mesoventrite and metaventrite black, abdomen yellow with ventrites 1 and 2 brown ( Fig. 1n ); legs yellow; pubescence yellowish white. Morphology. Body oval, convex, widest anterior to middle of elytra ( Figs. 1m, 1o ). Frons about twice the width of an eye diameter. Eyes oval with short triangular eye canthus. Clypeus apex weakly emarginate ( Fig. 1p ). Antenna with 11 antennomeres, the last three forming a spindle-shaped club. Apical maxillary palpomere securiform with sides slightly diverging. Protibia widely flanged, flange evenly arcuate, wider than remainder of protibia, outer margin smooth. Metaventrite without tuft of setae. Carinae on prosternal process separated, slightly convergent anteriorly, joined just before the anterior border. Epipleuron narrow, descending externally, grooved for reception of femoral apices. Abdominal postcoxal lines broadly rounded, incomplete, angled to posterior ventrite margin, flattened along margin, apex extended forward without reaching the anterior or lateral borders. Pores between ventrites 4–5 extended under apical 1/4 of ventrite 4 ( Fig. 1r ). Dorsal punctures somewhat irregularly distributed, head punctures very fine, separated by 1/2 diameter, pronotal punctures larger than on head, separated by about one diameter, elytral punctures larger than on pronotum, coarse and separated by a diameter or less; punctures on metaventrite smaller than on elytra, very scarce, separated by about four times their diameter; more dense laterally, punctures in median area of ventrite 1 similar than on elytra, separated by less than a diameter, smaller laterally, very fine in ventrites 2 to 5, and scarce in ventrite 6. Pubescence present only on ventral side, scarce, hairs short, denser toward lateral and apical margins of ventrites, without tufts of hairs. Male terminalia. Apex of ventrite 5 slightly convex throughout, apex of ventrite 6 convex, truncate medially ( Fig. 1r ). Tegmen 1.8 times longer than wide, phallobase trapezoidal, tegminal strut 1.5 times the length of the rest of the tegmen ( Figs. 1s, 1t ). Penis guide very asymmetric, 2.5 times longer than wide, rectangular at distal 2/5, left side regularly concave, right side with straight sections and an obtuse angle at 3/5 of the length, in lateral view triangular, inner side membranous, apex curved to the outer side ( Figs. 1t, 1u ). Parameres almost straight, somewhat wider towards the base and the apex ( Fig. 1u ), oval in lateral view, barely curving towards the inner side ( Figs. 1 s- 1t). Penis very narrow and curved along the entire length, curvature gradually decreasing from base to apex, in the distal 1/8 it bifurcates into a thin short spine on the outer side, with strong membranous projections towards the same side. Penis capsule large, outer arm somewhat irregular, 45° from the penis tube, 1.5 times as long as wide, inner arm shorter and almost perpendicular to the tube, basal margin with very deep concavity, accessory piece large, subquadrate ( Figs. 1 v-1w). Female. Unknown.

Measurements (mm): TL 2.5; PL 0.6; PW 1.4; EL 1.9; EW 1.8; GD 1.3.

Geographic distribution. Brazil, state of Amazonas.

Remarks. The genus Dilatitibialis Duverger, 2001 , was reviewed by Canepari et al. (2013) for South America, where he recognized 61 species, 38 of them described as new. In the tribe Brachiacanthini , the genus is characterized by the spineless anterior tibiae and by the presence of pores between ventrites 4 and 5. The present species is assigned to the “ mulsanti ” group defined in Canepari et al. (2013), due to the laterally curved paramere and the absence of some specific characters of other groups (such as a tuft of hair on ventrite 1 or tubercles on ventrite 5).

Etymology. The species is named after the city of Manaus, Brazil, where the holotype was collected.

Figures

Figures 1a-1w. a-l: Cyrea napoensis n. sp.; a-e: habitus (dorsal, ventral, lateral, frontal, posterior); f: abdomen; g-h: tegmen; i: penis guide; j: paramere; k-i: penis and detail. m-w: Dilatitibialis manaus n. sp.; m-q: habitus (dorsal, ventral, lateral, frontal, posterior); r: abdomen; s-t: tegmen; u: penis guide; v-w: penis and detail. Scale bars in mm. / a-l: Cyrea napoensis sp. n.; a-e: habitus (dorsal, ventral, lateral, frontal, posterior); f: abdomen; g-h: tegmen; i: guÍa del penis; j: parámero; k-i: penis y detalle. m-w: Dilatitibialis manaus sp. n.; m-q: habitus (dorsal, ventral, lateral, frontal, posterior); r: abdomen; s-t: tegmen; u: guÍa del penis; v-w: penis y detalle. Escalas en mm.