Staminodeus dilatatus, Nico M. Franz, 2001

Nico M. Franz, 2001, Description And Phylogeny Of Staminodeus, A New Genus Of Derelomini (Coleoptera: Curculionidae) Associated With Cyclanthaceae, The Coleopterists Bulletin 55 (4), pp. 411-432 : 426-427

Staminodeus dilatatus , new species

Diagnosis. Staminodeus dilatatus is distinguished from S. vectoris by the lower number of larger, subrectate dentes in males, in addition to differing from S. bispinosus and S. forcipis by the glabrate frons. See diagnosis of S. bispinosus for females.

Male. Length 1.4–1.9 mm, width 0.7–0.9 mm, l/ w 1.9 –2.2. Rostrum 0.4–0.5 mm, r/p 0.7–1.0. Frons glabrate. Pronotum l/ w 0.8 –0.9, convex. Prosternum longer than mesosternum. Profemur ( Fig. 3f ) slightly arcuate, f/p 0.9–1.1, width similar throughout, ventrally denticulate; protibia ( Fig. 3f ) subrectate, t/f 0.9–1.1, anteroventral margin with row of 3–6 apically directed, subrectate dentes, apically mucronate, promucron nearly 2/3 as long as protarsal claw; mesotibia apically mucronate, mesomucron nearly 1/4 as long as mesotarsal claw. Elytron l/ w 1.3 –1.4 (N 15). Median lobe ( Fig. 4f ) l/ w 3.0 –3.5 (N 5), laterobasal sclerites apically setose, median sclerite basally projected, apically bifurcate, setose, apical rami undulate, basal 2/3 of median lobe denticulate, aedeagal apodemes shorter than median lobe.

Female. Length 1.5–1.9 mm, width 0.8–1.0 mm, l/ w 1.9 –2.0. Rostrum 0.4–0.6, r/ p 1.0–1.1. Frontal spine nearly 3/5 as long as diameter of eye. Pronotum l/ w 0.8. F/p 1.0–1.2; t/f 0.8–1.0. Elytron l/ w 1.3 –1.4 (N 3). Spermatheca ( Fig. 5f ) deflexed nearly 120, apex narrowly projected.

Type Information. Male holotype ‘‘ PANAMA, Bocas del Toro, Corriente Grande, Rio Changuinola / 9 17 30 N, 82 32 41 W, H. Wolda, Feb. 3, 1980 ’’ ( CWOB) ; female allotype, same label as male holotype with different date ‘‘ Feb. 9, 1980 ’’ ( CWOB); male paratypes, same labels as male holotype with different dates ‘‘ Jan. 20, 1980 ’’ ( CWOB, 1), ‘‘ Feb. 11, 1980 ’’ ( CWOB, 1), ‘‘ Feb. 26, 1980 ’’ ( CWOB, 1), ‘‘ Mar. 13, 1980 ’’ ( CWOB, 1), ‘‘ Mar. 18, 1980 ’’ ( CWOB, 1), ‘‘ Mar. 28, 1980 ’’ ( MIUP, 1); ‘‘ Panama, Bocas del Toro, Cor. Grande, Rio Changuinola , 9 17 30 N, 82 32 41 W, leg. H. Wolda, III­15– 1980 ’’ ( MIUP, 1), same labels as previous specimen with different dates ‘‘ III­ 26–1980 ’’ ( MIUP, 2), ‘‘ III­29–1980 ’’ ( MIUP, 1); female paratypes, same label as male holotype with different date ‘‘ March 4, 1980 ’’ ( CWOB, 1); ‘‘ Panama, Bocas del Toro, Cor. Grande, Rio Changuinola , 9 17 30 N, 82 32 41 W, leg. H. Wolda, IV­24–1980 ’’ (MIUP, 1).

Etymology. Named for the diagnostic character of the male protibia with respect to S. vectoris , i.e., less and larger dentes— dilatatus signifying ‘‘spread out, enlarged, extended’’ ( Brown 1956).

Distribution. Staminodeus dilatatus has been collected on the Carribean slope of Panama, Provincia Bocas del Toro, Río Changuinola ( Fig. 6 ).

Natural History. Unknown.

Figures

Fig. 3. Staminodeus, male, right profemur and protibia, anterior view, a) S. inermis; b) S. curvitibialis; c) S. denticulatus; d) S. bispinosus; e) S. forcipis; f) S. dilatatus; g) S. vectoris. Scale bar 0.1 mm.

Fig. 4. Staminodeus, male, aedeagus, ventral and lateral view, a) S. inermis; b) S. curvitibialis; c) S. denticulatus; d) S. bispinosus; e) S. forcipis; f) S. dilatatus; g) S. vectoris. Illustrations are interpretative: denticulation and setation are omitted. Scale bar 0.1 mm.

Fig. 5. Staminodeus, female, spermatheca and gland reservoir, a) S. inermis; b) S. curvitibialis; c) S. denticulatus; d) S. bispinosus; e) S. forcipis; f) S. dilatatus; g) S. vectoris. Scale bar 0.05 mm.

Fig. 6. Distribution of Staminodeus in Costa Rica, Panama, and Venezuela, S. bispinosus; S. curvitibialis (distributional record for Colombia, Provincia Nariño, La Planada is omitted); S. denticulatus; S. dilatatus; S. forcipis; S. inermis; S. vectoris.