Paxillus manausensis Mattos & Mermudes

Mattos, Ingrid & Mermudes, José Ricardo M., 2013, Synopsis of Paxillus MacLeay, 1819 (Coleoptera: Passalidae): distributional records and descriptions of four new species from Brazil, Zootaxa 3652 (3), pp. 327-342 : 335-336

Paxillus manausensis Mattos & Mermudes , new species

( Figs. 17–21 )

Description. Length 15–16 mm. Head ( Fig. 17 ): labrum with anterior margin almost straight, with fine and moderately dense setiferous punctures; anterior frontal area irregularly punctate, with coarse and shallow punctures, somewhat dense; opaque inside the punctures; median frontal area irregularly elevated, opaque; anterior frontal ridges elevated, almost straight, reaching median frontal tubercles; posterior ridges forming an obtuse angle. Inner tubercles evident and prominent, smaller than medial frontal tubercles, medial frontal tubercles developed, elevated, and acuminate. Lateral frontal area deep with irregular elevations; elevations with coarse, shallow punctures, microsculpturing inside punctures. Bridge strong and smooth. Central tubercle short, not free, somewhat less dilated at base and merged with posterior lateral tubercles; posterior lateral tubercles small and distinct at the apex. Lateral post-frontal area smooth or punctate. Antennal club ( Fig. 18 ): first antennomere reduced, ½ shorter than second antennomere, narrower and acuminate at apex, other antennomeres subequal. Pronotum: anterior and lateral margins straight, anterior marginal groove short, usually reaching ¼ of anterior margin; rarely long, narrow and with fine punctures, weakly separated from anterior margin. Lateral marginal groove of pronotum narrow, with coarse, contiguous and dense punctures; lateral area with irregular punctation, sometimes confluent; indistinct scar; posterior margin with or without short pubescence or tuft of setae. Prosternal process, not flattened, posteriorly wide and truncate. Scutellum flattened, with wide median groove. Elytra: humeri with tuft of setae (females) or few short setae (males). Mesosternum smooth, short scar, reaching mid length of side of mesosternum, usually suboval; lateral anterior area opaque. Metasternum: disc evident, anterior lateral area with coarse punctures, confluent and microsculptured, reaching lateral median area near the disc; posterolateral area of metasternum with fine and denser punctures. Mesotibia dorsally pubescent, sometimes with one small spine. Aedeagus ( Fig. 19–21 ) slightly longer than wide and less sclerotized (dorsal view). Phallus globular, longer than parameres and phallobase together (lateral view); phallobase and parameres fused (lateral view), lacking division between them; parameres shortened, abruptly acuminate at apex, with inner right angle (lateral view). Phallobase strongly transverse and narrowed in the middle; ventral distal margin wide and deeply notched (ventral view).

Dimensions (mm). Total length (from anterior margin of labrum to apex of elytra) 15–16; elytral length (on median line) 9; pronotal length (on median line) 3; pronotal width 4; humeral width 4.

Type material. Holotype, male from Brazil: Amazonas: Manaus , VII.1959, C. Elias leg. Mattos & Mermudes det. 2012 (DZUP, nº 187918). Paratype: female with same data as holotype (DZUP, nº 187916).

Remarks. Paxillus manausensis is easily distinguished from P. borellii , P. pentaphyllus , and P. reyesi by the inner tubercles evident and prominent, smaller than the median frontal tubercles, the latter developed, elevated and acuminate; central tubercle short and merged with the posterior lateral tubercles, these small and distinct at the apex ( Fig. 17 ). In addition, the phallobase is strongly transverse and narrowed in the middle ( Figs. 19–21 ); with the distal margin wide and deeply notched (ventral view), and the parameres short, abruptly acuminate at the apex (lateral view).

Etymology. The name refers to the type locality, Manaus .

Figures

FIGURES 17 – 21. Paxillus manausensis, male: 17, head and anterior margin of pronotum, dorsal; 18, antennae, dorsal. 19 – 21. Aedeagus: 19, dorsal; 20, lateral; 21, ventral. Scale = 0.5 mm (Figs. 19 – 21 to the same scale).