Dasyrhopala trimellina Vilhena & Mermudes, 2025

Vilhena, Poliana De Mesquita & Mermudes, José Ricardo Miras, 2025, Review of Dasyrhopala Jordan, 1904 (Coleoptera: Anthribidae) with description of three new species from Brazil, Zootaxa 5632 (2), pp. 243-270 : 256-261

Dasyrhopala trimellina Vilhena & Mermudes sp. nov.

( Figs 37–54 , 75 )

http://zoobank.org/ urn:lsid:zoobank.org:act:21BAB16B-97B5-4553-BF09-654757021E86

Type locality. Barra de São Francisco , Espírito Santo, Brazil .

Type material. Holotype, male from BRAZIL, ( Figs 37–47 ) deposited at MNRJ: Espírito Santo, Corrego Itá [now, Barra de São Francisco ], XI.1956, W. Zikán leg. Paratypes, BRAZIL Minas Gerais: Pedra Azul (700 m) , 1 female, XI.1972, Seabra & Oliveira leg. ( MNRJ) ; Pedra Azul (700 m) , 1 male, XI.1972, Seabra & Oliveira leg. ( MNRJ) . Espírito Santo: 1 male, with same data of holotype ( DZRJ) ; Sooretama , 1 female, XI.1967, F. M. Oliveira leg. ( DZUP) ; Linhares , 1 female, XI.1973, dissected ( MNRJ) , 1 male, II.1975, dissected ( DZRJ) , 1 female, II.1975, ( DZUP) , 1 males, 2 females, II.1975 ( MNRJ) , 1 male, 9-15.I.1974, C. Elias Coll. ( UFMT) .

Diagnosis. Antebasal carina ( Fig. 37 ) nearly straight in center, wavy to sides. Rostrum ( Figs 40 , 51 ) narrower in middle, with vertical lateral carinae extending from base of frons to apical third, and median carina running from base of rostrum to apical third. Pronotum ( Figs 37 , 48 ) with three large yellow scale patches on posterior half, interspersed with two dark brown patches between them, and short longitudinal stripe of yellowish scales. Elytra ( Figs 37 , 48 ) with basal gibbosity on 3rd interstria elevated and acute; odd-numbered interstriae (3, 5, 7, and 9) feebly elevated. Pygidium ( Figs 39 , 50 ) with lateral margins converging toward apex in males.

Measurements. Holotype, male ( Figs 37–47 ). Measurements (in mm): total body length—7.46, head: length of rostrum—0.90, maximum width of rostrum—1.15, length of eye—0.63, distance between inner margin of eyes at middle of frons—1.33; antenna, length of segments: I—0.22, II—0.22, III—0.37, IV—0.30, V—0.25, VI— 0.24, VII—0.21, VIII—absent, IX—absent, X—absent, XI—absent; pronotum: maximum length—2.23, maximum width—2.49; elytra, maximum length—3.72, width in humeral part—2.76; pygidium: maximum length—0.76, maximum width—0.93.

Description. Males and females ( Figs 37–54 ). General integument dark brown, with light brown antennae. Dorsal vestiture ( Figs 37 , 48 ) with dark brown and yellowish scales.Antennae ( Fig. 41 ) reddish at joints, with whitish, fine and clear bristles, dense on club. Rostrum ( Figs 40 , 51 ) and head with dense yellowish scales. Pronotum ( Figs 37, 41 , 48–49 ) with three distinct, large yellow patches on posterior half, interspersed with two dark brown patches and short longitudinal stripe with yellowish scales. Elytra ( Figs 37 , 48 ) with conspicuous pattern of yellowish spots and stripes: proximal third with dorsal spots and another on epipleura, below humeri; light stripes on odd-numbered interstriae more pronounced and elongate on interstriae 3 and 5, broader on epipleura, which are connected to interstriae 3 and 5 at elytral apex; interstria 1 with less distinct and smaller spots; middle oblique stripe, darker than that starting from epipleura; another narrow stripe runs from humeri to apex of basal gibbosity, with dark brown scales. Ventral ( Figs 38, 41 ) vestiture of sparse pale yellow scales on prosternum, denser on mesosternal process, dense throughout metasternum; ventrites with pale yellow scales, glabrous stripes at sides, and other glabrous stripe running through center of all ventrites. Tibiae ( Figs 38, 41 ) with yellowish scales. Tarsi ( Fig. 38 ) with dense white scales. Pygidium ( Fig. 39 ) with dense yellowish scales and sparse dark brown scales. Head, frons, and dorsal rostrum microcorrugate, with rare irregular and elongate wrinkles.

Rostrum ( Figs 40 , 51 ) wider than long, narrower in the middle, with vertical lateral carinae from base of frons at apical third, and median carina from base of rostrum to apical third. Scrobe ( Fig. 41 ) foveiform; scape pyriform. Eyes ( Figs 40–41 , 49, 51 ) lateral, subrounded, indented anteriorly. Prothorax ( Figs 37, 41 , 48–49 ) dorsally longer than wide, strongly convex, rounded at sides, wider at region of antebasal carina; antebasal carina broadly straight in middle, wavy to sides. Secondary subbasal carina vestigial. Prosternal process short, narrow at posterior margin, 1/6 narrower than coxal cavities, reaching half length of procoxae. Prosternum impressed, longer than wide, with sparse punctures. Mesosternum longer than wide, depressed at the anterior margin, with relatively dense coarse punctures. Metasternal process narrower at posterior margin, feebly wider than prosternal process, with subrounded apical margin, 1/2 smaller than mesocoxal cavity, and reaching middle of mesocoxae. Metasternum longer than wide, depressed at anterior margin with vertical groove.

Male terminalia. Tergite VIII ( Fig. 43 ) at least twice as long as wide, with parallel sides, broadly rounded at apical third, with subtruncate margin, distinctly pigmented along distal margins, with short, moderately sparse setae. Sternite VIII ( Fig. 43 ) slightly longer than wide, elongate with converging apex, broadly pigmented and membranous in triangular median area from proximal region to apex, with dilated area in basal third. Sternite IX ( Fig. 43 ) with apodemes at least three times longer than bifurcated region, which is strongly sclerotized. Tegmen ( Figs 44–45 ) with apodeme slightly shorter than ring, with rounded apical margin, lacking setae, and sides of ring strongly converging toward apex. Paramere subparallel at lateral margins; internally, notched and rounded at apex, with vestigial pre-apical fringe at middle. Aedeagus ( Figs 46–47 ) conspicuously curved in apical quarter (lateral view), with tectum and pedon strongly converging from base toward apex, forming distinctly triangular, elongate and tapered structure, with pointed apex. Tectum ( Figs 46–47 ) prominent proximally, with three sharpened and sclerotized projections, between apodemes with strongly pigmented bridge. Internal sac one-third shorter than aedeagus.

Female terminalia. Tergite VIII and sternite VIII ( Fig. 53 ) appear membranous and transverse, with subparallel sides and straight anterior margin, sides and near distal angles more pigmented. Apodeme of sternite VIII with length subequal to width of sternite, with increased thickness at base. Ovipositor ( Fig. 54 ) with distinct body, lacking transverse rods; ventral lobe narrow and fusiform, terminating before dentate plate. Lateral rods at least 1/3 shorter than median rods, thicker, obliquely truncated at apex. Dentate plate with two prominent teeth, one distal and sharp, other proximal and more robust.

Sexual dimorphism. Females have a more convex and broader pygidium at the base, while males possess a slightly more elongate and less convex pygidium.

Etymology. The name “ trimellina ” refers to the three large yellow scale patches on the posterior half of pronotum. The prefix “tri” is for three patches and “mellina” derives from mellinus in Latin, which stands for yellow.

Distribution ( Fig. 75 ). Espírito Santo and Minas Gerais, Brazil.

Differential diagnosis. Dasyrhopala trimellina ( Figs 37–54 ) is similar to D. tarsinivea in the dorsal vestiture of the elytra, sharing a very similar color pattern, but with a conspicuous pattern of stripes absent in D. tarsinivea . It is distinguished from all species by a narrower rostrum in the middle, vertical lateral carinae from the base of the forehead to the apical third, and a median carina from the base of the rostrum to the apical third; characterized by three large yellow patches on the posterior half, interspersed with two dark brown patches and a short longitudinal stripe of yellowish scales, and a sub-basal carina broadly straight in the middle and wavy on the sides.

Figures

FIGURE 75. Distribution map of Dasyrhopala species endemic to the Atlantic Forest biome on the Brazilian east coast.

FIGURES 37–41. Dasyrhopala trimellina, holotype male from Barra de São Francisco (Espírito Santo). 37, habitus in dorsal view; 38, habitus in ventral view; 39, pygidium in dorsal view; 40, head in dorsal view; 41, habitus in lateral view. Scale bars 37–38, 40–41: 1 mm; 39: 0.5 mm.

FIGURES 42–47. Dasyrhopala trimellina, holotype male from Barra de São Francisco (Espírito Santo). 42, abdomen in ventral view; 43, tergite VIII and sternite IX in ventral view; 44, tegmen in dorsal view; 45, tegmen in lateral view, 46, aedeagus in ventral view; 47, aedeagus in lateral view. Scale bars 42: 1 mm; 43–47: 0.5 mm.

FIGURES 48–51. Dasyrhopala trimellina, paratype female from Linhares (Espírito Santo). 48, habitus in dorsal view; 49 habitus in lateral view; 50 pygidium in dorsal view; 51, head in dorsal view. Scale bars 48–49, 51: 1 mm; 50: 0.5 mm.

FIGURES 52–54. Dasyrhopala trimellina, paratype female from Linhares (Espírito Santo). 52, abdomen in ventral view; 53, tergite VIII and sternite VIII in ventral view; 54, ovipositor in dorsal view. Scale bars 52, 54: 1 mm; 53: 0.5 mm.