Cachiporra Chamorro & Konstantinov

Chamorro, Maria Lourdes & Konstantinov, Alexander S., 2011, Cachiporrini, a remarkable new tribe of Lamprosomatinae (Coleoptera, Chrysomelidae) from South America, ZooKeys 78, pp. 43-60 : 48-50

Cachiporra Chamorro & Konstantinov gen. n. Figs 111522

Type species.

Cachiporra extremaglobosa Chamorro & Konstantinov

Description.

Body small, 1.81-1.85 mm long, 1.43-1.47 mm wide, and 1.01-1.04 mm thick, broadly oval.

Color. Body entirely black with bluish or bronzish tint, antennal capitulum and mouth parts deep reddish brown.

Head flat in lateral view, 1.42 times wider than long in frontal view, completely lacking hairs (except on labrum). Midcranial and frontal sutures absent. Top of frons and bottom of vertex with oval impression. Orbital area swollen and situated above eye level. Internal margin of eye entire, not notched. Distance between eyes 2.64 times as large as transverse diameter of eye. Labrum with three setae on each side placed symmetrically on anterior margin. Antennae extremely capitate with last 4 antennomeres tightly fused to form sphere (Figs 16, 18), inserted slightly above lower eye level with side of antennal socket adjacent to eye margin. Antennomere 1 wide with triangular lobe directed dorsolaterally. Antennomere 2 cylindrical, shorter than wide. Antennomers 3 to 7 dorsoventrally flat, about as long as antennomere 2, but narrower.

Prothorax. Pronotum apically shallowly sinusoidal, basally sinuate, medially extending posterad beyond elytral base. Each pronotal puncture with short seta. Sides swollen and bent ventrally so that lateral border not visible from above. Lateral border situated close to posterior margin of prosternum leaving hypomera extremely thin and limiting prosternum to small triangle. Intercoxal prosternal process in ventral view slightly longer than wide (length to width ratio 1.26), sides constricted above middle, anterior margin evenly concave with obtuse denticle in middle, posterior margin straight. Intercoxal prosternal process in lateral view nearly straight in middle, abruptly bending posterodorsally. Procoxal cavity open posteriorly.

Mesothorax. Scutellum triangular, equilateral, small (Fig. 15). Elytra with well developed humeral calli. Side of elytron with long lobe directed ventrally covering significant part of metepisternite (Fig. 11). Elytral punctation confused, with a tendency to form longitudinal rows. Each elytral puncture bearing short seta. Epipleura narrow. Mesosternum vertical, nearly completely covered with intercoxal prosternal process and anterior process of metasternum separating mesocoxae.

Metathorax. Anterior process of metasternum rectangular with straight anterior margin (Fig. 16). Posterior margin curved. Surface shallowly shagreened with relatively large punctures placed more densely anteriorly.

Wing fully developed (Fig. 19). Radial (RA) sinusoidal, wide, and strongly sclerotized laterally, bending posteriorly. RP connected to posterior arm of radial cell, divided into two parts: poorly sclerotized median and strongly sclerotized lateral. AA better developed than CuA. RA 3+4 absent. Cu and A form only one complete cell.

Abdomen. First visible abdominal ventrite as long (medially) as rest of abdomen. Second visible ventrite narrowest, half as narrow medially as either third and fourth. Third and fourth of equal length (Fig. 12). Last abdominal ventrite three times longer than preceding, without stridularoty file (device) on distal border. Pygidium exposed.

Kotpresse without dorsal or ventral sclerites with chitinpolster dorsally and ventrally; long lateral fold sclerotized and bent upward and with small denticles (Fig. 22).

Legs. Femora dorsoventrally flat with anterior and posterior sides nearly parallel to each other. Tibiae slightly curved in ventral view gradually widening apically. All tibial apices with small spur, but without long setae and excavation. Tarsal claws relatively small, simple, and free.

Female genitalia (Figs 20, 21). Paraproct (pleurite of segment IX) narrow. Proctiger (upper layer of tergite IX) widely triangular, with setae on their apical margins, moderately sclerotized and narrow membranous stripe between them. Stylus parallel-sided, at base much narrower than long, separated by distinct border from coxite (apical part of appendage of segment IX). Spermatheca without border between pump and receptacle. Base of spermatheca constricted forming short canal branching into gland and duct. Gland and duct relatively short making no loops. Tignum absent.

Etymology.

“Cachiporra” is the Spanish word for “billy” club (capitulum). “Cachiporra” alludes to the club-shaped antenna of this lamprosomatine. Feminine.

Distribution.

Brazil, Rio Grande do Norte, Natal.