Cryptocanthon pumilus Cook, 2002

Cook, Joyce, 2002, A Revision Of The Neotropical Genus Cryptocanthon Balthasar (Coleoptera: Scarabaeidae: Scarabaeinae), The Coleopterists Bulletin (mo 1) 56, pp. 3-96 : 24-26

7. Cryptocanthon pumilus Cook sp.nov.

( Figs. 41–45 )

Material Examined. Five specimens (3 males, 2 females)

Type Material. Holotype: ‘‘ COLOMBIA: Vaupes, / Caparú , 100 m, 29.XI. / 95 1 g Terraza, A. solis / EH BHT 24h’’ ( CMNC) male . Paratypes (4): same data as holotype ( AFIC) 1 male ; same locality ‘‘30/XI/95 5 g / Serrania J.C. Bello BHT / EH h t7’’ ( AFIC) 1 female ; same locality ‘‘ Terraza 100 m / 1 gr. excrem humano / S. Amezquita, leg / Nov 1995 BHT’’ ( FZVC) 1 male, 1 female .

Etymology. The epithet ‘‘pumilus’’ (Latin), ‘‘dwarf,’’ refers to the small size of this species.

Diagnosis. This species is distinguished by the following combination of characters: vertical surface of clypeus not foveate; pronotal hypomeron not carinate; inflexed portion of elytron with basal fovea; metathoracic wings fully developed; pygidium convex, with median longitudinal swelling; paramere apices roundly angulate ( Fig. 44 ).

Description. Holotype. Male. Total length 3.2 mm; greatest width 2.0 mm. Head. Clypeus not strongly produced anteriorly ( Fig. 42 ). Clypeal teeth moderately developed, widely separated, moderately reflexed. Clypeal emargination evenly rounded; vertical surface broadly V-shaped, not foveate. Apical margin of clypeus lateral to teeth convexly arcuate. Disc of clypeus concave, with moderately small, shallow punctures separated by about one diameter or less. Clypeogenal suture vaguely indicated. Gena not produced, with slight angle at junction with anterior margin of clypeus. Vertex and gena with moderately small, shallow, annulate punctures separated by less than one diameter. Pronotum. Convex medially, laterally explanate, with shallow depressions laterally in posterior half. Anterior angles approximately rightangled. Sides anterior to lateral angles slightly concave; slightly convex posterior to lateral angles. Posterior angles obtuse, not incised. Pronotal disc with moderately small, shallow punctures separated by less than one diameter; laterally, punctures mediumsized, shallow, annulate; setae pale, short, nearly recumbent. Pronotal hypomeron convex, with medium-sized, shallow punctures; longitudinal carina absent. Elytra.

43) aedeagus, lateral; 44) parameres, dorsal. Scale line 5 0.5 mm.

Transversely and longitudinally moderately, evenly convex; lateral carinae not elevated. Each elytron dorsally with seven striae, each stria indicated by two wavy lines. Elytral intervals slightly convex apically; each interval with row of small setose punctures on each side adjacent to striae; setae pale, strongly arched. Inflexed portion of elytron moderately broad, evenly narrowed apically, with scattered, shallow punctures in basal half; basal fovea present; one stria (eight or nine) not reaching base, ten complete along margin of epipleuron. Epipleuron with small, shallow punctures.

Wings. Metathoracic wings fully developed. Venter. Prosternum and mesosternum with medium-sized shallow, annulate punctures. Meso-metasternal suture narrowly rounded medially. Metasternum slightly convex medially; disc minutely punctate in anterior two-thirds, with medium-sized, shallow, annulate punctures in posterior third; laterally, punctures large, dense, annulate. Legs. Profemur strongly punctate ventrally. Protibia ( Fig. 41 ) not expanded medially, not notched, apex strongly lobed medially. Mesofemur and metafemur with small, elongate punctures ventrally. Metatrochanter unmodified. Metatibia not angulate, inner margin not crenulate and without subapical lobe or tooth. Abdomen. Apical sternite evenly convex, with medium-sized, shallow, annulate punctures. Pygidium convex, with median longitudinal swelling; punctures medium-sized, shallow, annulate, dense; base with short sulcus. Male genitalia. Parameres ( Figs. 43–44 ) with apices roundly angulate, not setose.

Variation. Male: total length 3.1–3.3 mm; greatest width 1.8–2.0 mm. Female: total length 3.1–3.6 mm; greatest width 1.8–2.1 mm; clypeal teeth more strongly developed; protibia unmodified.

Bionomics. This species has been collected in human dung traps at 100 m elevation during the month of November.

Geographic Distribution ( Fig. 45). This species is known only from the type locality in the Amazonian lowlands of the Colombian commissary of Vaupes .

The Middle America Species Group. Thirteen species are placed in this group ( C. bochilae , C. brevisetosus , C. cristobalensis , D. denticulum , C. howdeni , C. lindemanae , C. lobatus , C. montebello , C. newtoni , C. osaensis , C. ocosingo , C. rayonensis , and C. solisi ). These species share two apomorphies: 1) the presence of a longitudinal median depression on the pronotum; 2) the presence of a carina on the pronotal hypomeron (cladogram, Fig. 191 ).

Figures

Figs. 41–44. Cryptocanthon pumilus. 41) left protibia, male; 42) clypeal outline;

Fig. 191. Tree showing phylogenetic relationships among the species of Cryptocanthon. Black circles indicate homology, white circles indicate homoplasy. Character numbers are above each circle. The outgroup is Paracryptocanthon borgmeieri (Vulcano et al.). Tree length 5 53; consistency index 5 0.35; retention index 5 0.77.