Bagous transversus

ROBERTO CALDARA, CHARLES W. O’BRIEN & MASSIMO MEREGALLI, 2017, A phylogenetic analysis of the aquatic weevil tribe Bagoini (Coleoptera: Curculionidae) based on morphological characters of adults, Zootaxa 4287 (1), pp. 1-63 : 46

19. Bagous transversus group

Diagnosis. Inner surface of dorsal process covered with a dense area of denticles (char. 100.1). Lateral margin of penis body at base of dorsal process with subapical lateral incision (char. 102.1), with areas laterad and distad of orifice denticulate (char. 66.1). Penis body widest in front of dorsal process (char. 97.1) and markedly constricted immediately proximad of this (char. 107.1); dorsal process semicircular laterally with anterior concavity, very slightly asymmetrical distad of orifice (char. 96.1).

Remarks. This largely widespread group, which includes species from all regions except the Australian and Afrotropical regions, is separated from other species only by male genital characters (three synapomorphies). In the mtCOI analysis B. limosus formed a strongly supported clade (96% pp) together with B. frit , B. longitarsis and B. collignensis . Bagous limosus differs from the other species of the group by the elytra with strial punctures large, one-third to more than one-half of intervals width, a character state shared with other unrelated species.

Species included. NAR: ¹ Bagous cavifrons LeConte, 1876 , ¹ B. maculatus Blatchley, 1916 , ¹ B. texanus Tanner, 1943 , *¹ B. transversus LeConte, 1876 ; ORR: ¹ B. loisae O'Brien, 1995 , ¹ B. similis O'Brien, 1995 , ¹ B. youngi O'Brien, 1995 ; PAL: §*² B. limosus (Gyllenhal, 1827) .