Deltochilum (Aganhyboma) acanthus Kohlmann & Solis 2012
Creators: name: Silva, Fernando A. B.
name: Louzada, Júlio
name: Vaz-De-Mello, Fernando
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Deltochilum
Deltochilum acanthus

description: Deltochilum (Aganhyboma) acanthus Kohlmann & Solís 2012
(Figs 15, 91, 111)
Deltochilum (Deltohyboma) acanthus Kohlmann & Solís 2012: 35, 36, 37, 38, Figures 6, 7 and 15 (original description)
Description. Body. Head, pronotum, elytra and ventral surface black or dark brown, with an evident sheen. Length <13 mm. Head. Punctures dense, nearly touching at central portion; around clypeus shallower, smaller and more dispersed than those on the interocular surface. Lateral margin of gena, around eyes, without row of setae or with almost inconspicuous setae. Dorsal interocular distance approximately 2.5 times eye width. Thorax. Surface of pronotum with dense foveiform punctures, not touching each other. Punctures on the sides, anterior and posterior angles separated by half diameter or less. Discal punctures smaller and more dispersed than those of lateral portion, separated by approximately two times their diameter. Anteromedial punctures smaller and more dispersed than discal punctures. Posteromedial punctures separated by less than one diameter. Margin between anterior and lateral angles with row of small setae. Margin between lateral and posterior angles straight, with the same length of margin between anterior and lateral angles. Hypomera with dense foveiform punctures at anterior portion and absent at posteromedial portion; anteromedial punctures usually separated by less than one diameter. Diagonal band of hypomera from posteromedial portion to middle of lateral margin lacking punctures or with one or two isolated punctures on otherwise smooth surface (as in Fig. 83). Elytra. Lateral margins semiparallel (Fig. 111) and surface slightly irregular (rugose). Elytral striae with carinate margins clearly separated; several punctures clearly elliptical, separated by regular spacing. Interstriae flattened, with foveiform punctures surrounded by approximately four well-defined shiny microtubercles. Foveiform punctures separated on elytral disc by approximately one diameter. Basal carina of seventh interstria elongate, length about four times the width of the seventh interestria. Basal carina of ninth interstria with approximately one-half of elytral length (as in Fig. 80). Apical carina or tubercle of second interstria present. Apical carina of third interstria weaker than apical carina of fourth interstria. Length of apical carina of sixth interstria longer than that of apical carina of fifth interstria. Length of apical carina of seventh interstria noticeably less than that of sum of apical carinae of fifth and sixth interstriae. Pseudepipleural carina incomplete, effaced medially (as in Fig 80).
Material studied. Holotype (INBio) [not examined]: COSTA RICA: Prov. Puntarenas, Res. Biol. Carara, Est. Quebrada Bonita, VI. 1993, 50 m, J.C. Saborío, L-N-194500, 469850, CRI 001185073 (1 ♂ INBio collection). The original description is sufficient to confirm the identification of species.
Non-type material [2]: PANAMA: PANAMA: Gatún Lake, Barro Colorado Island, 5.V.1981, B. Gill (1 ♂ CMN). COSTA RICA: PUNTARENAS: Osa Peninsula. Río Piro, la Joya 350m, 8°23'56"N, 83°19'51"W, V–IX.1997, N. Gibson (A. Forsyth) (1 ♀ AFIC).
Sampling methods. flight interception trap [1 specimen].
Habitat. Panama and Costa Rica (Fig. 91). According to Kohlmann & Solis (2012), this species inhabits Pacific tropical rain forest of Costa Rica and the Canal Zone of Panama, ranging from 0 to 100 m AMSL.
Diagnosis and remarks (within the acropyge complex): foveiform punctures of dorsal interocular surface nearly touching; foveiform punctures of pronotal disc separated by approximately twice their diameter; posteromedial punctures of pronotum usually separated by less than one diameter; pronotal margin, between lateral and posterior angles, with approximately the same length of margin between anterior and lateral angles; elytra with lateral margins semiparallel (Fig. 111); punctures of elytral striae often elliptical, separated by regular spacing; apical carina or tubercle of second elytral interstria present; pseudepipleural carina incomplete, effaced medially (as in Fig 80). The following aedeagus characters are also diagnostic: parameres symmetric and elongate, length approximately equal to phallobase; in lateral view forming an angle of approximately 45° with phallobase; apex rounded (Fig. 15). Lamella copulatrix (LC): subrectangular sclerites. Fronto-lateral peripheral sclerite (FLP) as in Fig. 54.
description: Published as part of Silva, Fernando A. B., Louzada, Júlio & Vaz-De-Mello, Fernando, 2015, A revision of the Deltochilum subgenus Aganhyboma Kolbe, 1893 (Coleoptera: Scarabaeidae: Scarabaeinae), pp. 451-504 in Zootaxa 3925 (4) on pages 476-477, DOI: 10.11646/zootaxa.3925.4.1, http://zenodo.org/record/244795