Cryptocanthon osaensis 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 : 48-49

18. Cryptocanthon osaensis Cook sp.nov.

( Figs. 99–103 )

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

Type Material. Holotype: ‘‘ COSTA RICA. Rancho Quemado , 200 m / Península de Osa, Prov. Punt[arenas] / Ago 1991. F. / Quesada. L-S-292500, 511000’’ ( INBIO) male . Paratypes (4): same locality as holotype ‘‘J.C. Saborio, May 1991 ’’ ( INBIO) 1 male ; same locality as holotype ‘‘D. Brenes, Abr 1992 ’’ ( INBIO) 1 female ; same locality as holotype ‘‘ Dic 1992, M. Segura ’’ ( INBIO) 1 female ; ‘‘ 4 km W Rancho /

Quemado, 088419360N / 838359330W, 500 m, 24.VI.2001 / R. Anderson, ridge forest litter / 2001-121B’’ ( CMNC) 1 female .

Etymology. The epithet ‘‘osaensis,’’ Latin adjectival form, refers to the geographic distribution of this species on the Osa peninsula of Costa Rica.

Diagnosis. This species is distinguished by the following combination of characters: vertical surface of clypeus not foveate; pronotal hypomeron carinate; inflexed portion of elytron with minute fovea; metathoracic wings fully formed; pygidium strongly lobed medially, with median longitudinal swelling; paramere apices acutely rounded ( Fig. 101 ).

Description. Holotype. Male. Total length 3.5 mm; greatest width 2.2 mm. Head. Clypeus not strongly produced anteriorly ( Fig. 100 ). Clypeal teeth well developed, widely separated, strongly reflexed. Clypeal emargination between teeth evenly rounded, vertical surface shallowly V-shaped, not foveate. Apical margin of clypeus lateral to teeth arcuate. Disc of clypeus concave, coarsely, densely punctate. Clypeogenal suture evident. Gena slightly produced, forming angle at junction with anterior margin of clypeus. Vertex and gena coarsely, densely punctate; punctures umbilicate. Pronotum. Convex medially, laterally explanate, with depressions laterally in posterior half. Anterior angles acute. Sides anterior and posterior to lateral angles straight. Posterior angles obtuse, not incised. Pronotum coarsely, densely punctate; setae short, pale, nearly recumbent. Pronotal hypomeron convex, with large, shallow punctures; posterior lateral carina present. Elytra. Transversely and longitudinally moderately convex; lateral carinae not strongly elevated. Each elytron dorsally with seven striae, each stria indicated by two wavy lines. Elytral intervals flat; each interval with row of small punctures on each side adjacent to striae; punctures bearing short, pale, strongly arched setae. Inflexed portion of elytron moderately broad, evenly narrowed apically, with minute basal fovea and scattered setose punctures throughout; striae eight and nine absent, ten indicated by a row of punctures adjacent to epipleuron. Epipleuron with scattered moderately large shallow punctures. Wings. Metathoracic wings fully formed. Venter. Prosternum with small to medium-sized punctures. Mesosternum nearly impunctate medially; with large, shallow, annulate punctures laterally. Meso-metasternal suture roundly arched medially. Metasternum flat medially, anteriorly with minute scattered punctures, scattered larger punctures posteriorly; laterally, punctures large, dense, annulate. Legs. Profemur coarsely, densely punctate ventrally. Protibia ( Fig. 99 ) expanded medially in apical half, with preapical notch; strongly produced medially at apex. Mesofemur and metafemur with moderately spaced, elongate punctures ventrally. Metatrochanter unmodified. Metatibia roundly angled; inner margin crenulate, with small lobe near apex. Abdomen. Apical sternite densely punctate. Pygidium with strong median convexity and median longitudinal swelling; shallow sulcus at base; punctures shallow, annulate. Male genitalia. Parameres ( Figs. 101–102 ) with apices narrow, acutely rounded.

Variation. Male: greatest width 2.2–2.3 mm. Female: total length 3.5–3.6 mm; greatest width 2.2–2.3 mm; clypeal teeth longer; tibiae unmodified.

Bionomics. This species has been collected in forest litter, at 200 m and 500 m, during the months of April–June, August and December.

Geographic Distribution ( Fig. 103). This species occurs on the Osa Peninsula of Costa Rica.

Figures

Figs. 99–102. Cryptocanthon osaensis. 99) left protibia, male; 100) clypeal outline; 101) parameres, dorsal; 102) aedeagus, lateral. Scale line 5 0.5 mm.