Rhinolaemus Steel 1954:143, Steel, 1954

Thomas, Michael C., 2016, A revision of the genus Rhinolaemus Steel (Coleoptera: Laemophloeidae), Insecta Mundi 2016 (505), pp. 1-17: 2-3

publication ID


publication LSID


persistent identifier


treatment provided by


scientific name

Rhinolaemus Steel 1954:143


Rhinolaemus Steel 1954:143  

Diagnosis. Individuals of this genus can be distinguished from those of other laemophloeid genera by a combination of the following character states: Head usually rostrate; labrum deeply emarginate in males; mandibles elongate; anterior coxal cavities closed posteriorly, intercoxal process truncate; dorsal surface clothed with conspicuous, stout, reclinate setae; elytra maculate, with both cuticle and setae bicolored; abdominal segment VII modified to form claspers with peg setae.

Description. Steel (1954:143) provided a very detailed generic description, which is reproduced below, with alterations (in italics) to take into account knowledge of the male sex and additional species, and figure references to the current paper are added:

Dorsal surface with conspicuous pubescence composed of thick, recumbent setae ( Fig. 1–10). Body with a dorsal color pattern ( Fig. 1–4). Head not distinctly ( Fig. 9 View Figures 9–11 ) or moderately produced in front of the eyes as a short, broad, flattened rostrum; rostrum longer and narrower in females of some species ( Fig. 5–8 View Figures 5–8 , 10 View Figures 9–11 ), the clypeus a little produced and broadly emarginate anteriorly ( Fig. 12 View Figures 12–15 ). The eyes rather large, not very coarsely faceted. Ventral head sutures (“gular” sutures) present as two short, well marked, slightly converging lines which commence at about the level of the posterior margins of the eyes and end, each in a small fovea, a little in front of the level of the middle of the eyes.

Antennae with the first segment long, more or less club-shaped, inserted in cavities at the sides of the head; antennal insertions broadly exposed dorsally ( Fig. 12 View Figures 12–15 ) or concealed ( Fig. 9–10 View Figures 9–11 ).

Labrum prominent, slightly transverse, narrowed towards front, the sides almost straight, the front margin, rounded in females ( Fig. 5, 7 View Figures 5–8 , 9 View Figures 9–11 ), deeply emarginate in males ( Fig. 12 View Figures 12–15 ); dorsal surface with a few scattered fine setae, the front margin with a dense fringe of finer shorter setae. Mandibles long and slender ( Fig. 12 View Figures 12–15 ), lightly curved apically, bifid at tip (seen from the side), just behind apex with a small rounded tooth and a little behind this a smaller, more pointed one; prostheca and molar area well developed, the latter filelike. Inner lobe of maxilla [lacinia] very narrow, of the normal form for the subfamily, the outer [galea] much longer and broader, internally (in front of inner lobe) with a dense fringe of fine setae which are longer towards the front, external margin with a few long fine setae. Maxillary palpi very long, the first segment distinctly longer than broad, the second much longer, widened apically, the third a little shorter than the second, widened apically, the fourth slightly longer than the third, somewhat fusiform, rounded apically ( Fig. 16 View Figures 16–19 ). Labium chitinized, as long as broad, broadest at about middle, the anterior margin broadly, somewhat triangularly, emarginate, the sides straight between the anterior margin and the widest part; anterior margin with a few rather long fine setae. Labial palpi very long, the first segment subquadrate, the second considerably longer, slightly curved, rounded apically, the third a little shorter than the second, rounded apically ( Fig. 15 View Figures 12–15 ). Mentum strongly transverse.

Pronotum with lateral margins evenly curved ( Fig. 5–8 View Figures 5–8 ) or obtusely dentate ( Fig. 9-10 View Figures 9–11 ); sublateral lines represented by a strongly elevated ridge, without an accompanying groove ( Fig. 24 View Figures 24–27 ). Prosternal process broad, truncate or slightly emarginate, the anterior coxal cavities closed behind (seen from below) ( Fig. 17 View Figures 16–19 ), separated by nearly three times their maximum width (seen from below). Intermediate and posterior coxae as broadly separated as the anterior ( Fig. 19 View Figures 16–19 ).

Scutellum distinct, transverse, obtusely pointed behind ( Fig. 15 View Figures 12–15 ).

Elytra completely covering the abdomen. Discrimen almost attains anterior edge of metasternum. First visible abdominal sternite long, a little more than twice as long as the second, the intercoxal portion broad, lightly rounded in front, the second to fourth about equal in length, the fifth distinctly longer, nearly twice as long as the fourth ( Fig. 19 View Figures 16–19 ).

Legs rather long. Tarsi with the first segment very short, hardly visible from above, the second much longer, longer than the third, the third slightly longer than the fourth, the fifth about as long as the remainder. Tarsal formula 5–5– 4 in males, 5–5– 5 in females.

Male genitalia ( Fig. 20–23 View Figures 20–23 , 26, 27 View Figures 24–27 ) with parameres not or slightly separated; basal piece of tegmen with paired, posteriorly directed, rounded, setose projections, as in Placonotus Macleay ( Thomas 1984b)   ; tip of median lobe abruptly expanded; internal sac with fibrous armature; sternite and tergite of abdominal segment VIII modified to form claspers, with peg setae ( Fig. 25 View Figures 24–27 ).












Rhinolaemus Steel 1954:143

Thomas, Michael C. 2016


Steel, W. O. 1954: 143