Stenocerus similis, Lopes & Mermudes, 2018

Lopes, Marcela Paes De A. M. & Mermudes, José Ricardo M., 2018, Four new species and new synonymy in Stenocerus Schoenherr, 1826 (Coleoptera, Anthribidae, Anthribinae, Stenocerini), Zootaxa 4472 (3), pp. 471-488 : 478-481

publication ID	https://doi.org/ 10.11646/zootaxa.4472.3.3
publication LSID	lsid:zoobank.org:pub:095788F7-768D-4D3B-9453-9DB2E321CDB0
DOI	https://doi.org/10.5281/zenodo.5960265
persistent identifier	https://treatment.plazi.org/id/475087F7-3376-FB27-AAAA-FC36B2D3902A
treatment provided by	Plazi
scientific name	Stenocerus similis
status	sp. nov.

Treatment

Stenocerus similis sp. nov.

( Figs. 29–42 View FIGURES 29–30 View FIGURES 31–42 )

Etymology: Latin, similis = similar, allusive to the similarity with S. nigrotessellatus . Blanchard, 1847.

Diagnosis: Rostrum tricarinate. Pronotum with pale yellow scales forming a hollow triangle at disc; antebasal carina almost straight, slightly oblique to middle; lateral carina strongly prominent and straight. Elytra predominantly with black-brownish scales, with pale yellow scales at humeral declivous and apical portion of apical declivous, distinct transverse stripe with sharper and denser yellow scales after the middle, which extend from interestria 3 to epipleura. Mesosternal process projected, anterior margin convex and posterior subtruncate.

Description: Male ( Figs. 31–42 View FIGURES 31–42 ). Integument black-brownish to dark. Dorsal vestiture: rostrum with short, fine, and decumbent light and pale brownish scales, but with predominance of black-brownish; each side of vertex, with fine yellow stripe; antennomeres IV–XI ( Fig. 33 View FIGURES 31–42 ) with elongate, fine and erect light brownish setae throughout each antennomere; club (IX–XI) with dense light brownish pubescence; pronotum with pale yellow and decumbent scales forming a hollow triangle at disc; elytra ( Fig. 37 View FIGURES 31–42 ) predominantly with black-brownish scales, with pale yellow scales at humeral declivous and apical portion of apical declivous, distinct transversal stripe with sharper and denser yellow scales after the middle, which extend from interstriae 3 to epipleura; pygidium ( Fig. 39 View FIGURES 31–42 ) with brownish scales, moderately dense. Ventral vestiture: sides of pro- and mesothorax and legs predominantly with black-brownish scales; ventrites black-brownish intermingled with pale scales; tarsomeres I–II densely yellowish.

Head slightly microcorrugate. Rostrum ( Fig. 31 View FIGURES 31–42 ) microcorrugate, about 1.7x longer than basal wide; median carina moderately elevated, extending from apex to frons; dorsolateral carina extending from antennal insertion to base of rostrum; apical margin notched; laterally, distance between scrobe and eye ( Fig. 32 View FIGURES 31–42 ) subequal to maximum width eye; ventral surface elevated longitudinally and depressed at sides, with deep groove on each side of impression near scrobes. Mentum glabrous, surface microstriate, apical margin rounded. Gula microcorrugatepunctate. Antennae reaching basal margin of pronotum; scape stout; antennomere II subcylindrical and thickened, wider at apex, approximately twice as short as III; III–VII impressed dorsoventrally and expanded at apex, VIII–XI weakly impressed dorsoventrally; antennomere III longest; IV 1.5x shorter than III; IV–VIII decrease in length; antennal club (IX–XI) subequal; XI convergent at sides, and subacuminate apex.

Prothorax ( Figs. 34–35 View FIGURES 31–42 ) about 1.7x wider than long. Pronotum ( Fig. 34 View FIGURES 31–42 ) with broad and moderate depression, deeper near sub-basal carina, and with very distinct central elevation; antebasal carina sub-rectilinear and feebly rounded at median third, near basal carina; sides very weakly convergent from antebasal carina to anterior margin; lateral carina ( Fig. 35 View FIGURES 31–42 ) elongate, reaching anterior third of prothorax, strongly prominent and straight. Prosternum prominent, flattened at disc, subglabrous and corrugate; prosternal process not reach distal margin of procavity. Mesosternal process ( Fig. 36 View FIGURES 31–42 ) slightly shorter than width of mesocavity, anterior margin convex, sides convergent and posterior margin subtruncate. Scutellum subrectangular, with proximal margin truncate and apical rounded. Elytra ( Fig. 37 View FIGURES 31–42 ) 1.3x longer than wide across humeri, sides parallel, subconvex at apex, lacking tubercles.

Abdomen ( Fig. 38 View FIGURES 31–42 ): ventrites I–IV depressed at middle; V about 1.6x longer than IV, discreetly depressed at sides, apical margin straight. Pygidium ( Fig. 39 View FIGURES 31–42 ) with length of apical portion 1.6x longer than basal half; apical margin truncate-rounded. Terminalia ( Figs. 40–41 View FIGURES 31–42 ): tergite VIII ( Fig. 40 View FIGURES 31–42 ) discreetly sinuous at sides, slightly wider than long, apical lobes slightly convergent, sclerotized at sides and apex, this with apical notched broad and subrounded (this notch a little more than twice as wide as each of the lobes), with short and sparse setae at apical lobes; sternite VIII membranous with latero-apical lobes defined, sclerotized and with short and sparse setae; sternite IX with apodeme about 4.5x longer than arms. Tegmen ( Fig. 41 View FIGURES 31–42 ) with apodeme slightly shorter than sclerotized ring, lateral portion adjacent to foramen pigmented; apodeme 1.4x longer than arms; pre-apical margin bilobate and more sclerotized at apex; parameres elongate, about 1.5x shorter than apodeme, fused at proximal half, and slightly constricted before middle; apex of parameres subtruncate, with deep subtriangular medial notch, and long and dense setae at the central and ventral region, near pre-apical margin; sinuous in lateral view. Penis ( Fig. 42 View FIGURES 31–42 ) elongate and curved, with body about 1.6x of length apodemes; bridge between apodemes sclerotized gradually from proximal to distal margin; tectum membranous, elongate and pigmented, weakly little more than twice as long as wide, with sclerotized margins, convergent to acuminate apex; pedon continuous with apodemes, sclerotized gradually from base to apex; sides convergent to acuminate apex. Internal sac slightly shorter than apodemes, about 2.3x of penis length, and with dorsal and proximal area spiculate.

Type material: Holotype male from Peru, Mariscau, Juanjuí, HT- Amazone, Région de Juanjuí, 1935, col. R. Oberthür, Muséum Paris ; Stenocerus similis sp. nov. Holotype male, Lopes & Mermudes det. 2017 ( MNHN) . Paratype male with the same data as holotype ( MNHN) – dissected.

Remarks: Stenocerus similis sp. nov. ( Figs. 29–30 View FIGURES 29–30 ) is similar to S. nigrotessellatus (characters of S. nigrotessellatus in parentheses): 1) lateral carina elongate (lateral carina short); 2) antebasal carina sub-rectilinear, feebly rounded at median third, near basal carina (antebasal carina more broadly angulate at middle, and away from secondary transverse carina); 3) elytra ( Fig. 37 View FIGURES 31–42 ) predominantly with black-brownish scales, with dense pale yellow scales at humeral declivous and apical portion of apical declivous, distinct transverse stripe with sharper and denser yellow scales after the middle, which extend from interstriae 3 to epipleura (in variation found in S. nigrotessellatus , do not form this pattern in the apical declivity); 4) mesosternal process projected with anterior margin convex (anterior margin slightly more convex).