Deltochilum (Aganhyboma) longiceps Paulian 1938
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 longiceps

description: Deltochilum (Aganhyboma) longiceps Paulian 1938 new subgeneric placement and new status
(Figs 16, 37, 61, 80, 83, 84, 91, 110)
Deltochilum (Deltochilum) valgum var. longiceps Paulian 1938: 269, 273 (original description, identification key) Deltochilum longiceps: Blackwelder 1944: 203 (checklist)
Contreras 1951: 222 (catalogue)
Deltochilum (Deltohyboma) valgum longiceps: Vulcano & Pereira 1967: 557 (identification key) Deltochilum valgum longiceps: Cano 1998: 177 (comment on feeding behavior)
Escobar 2003: 131 (observations of feeding behavior, referred as Deltochilum acropyge, "misidentification")
Description. Body. Head, pronotum, elytra and ventral surface black or dark brown, with an evident sheen. Length> 13 mm. Head. Punctures dense, but not touching each other; foveiform punctures separated at the dorsal interocular surface by approximately one diameter (Fig. 61). Punctures 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 three times eye width (Fig. 61). Thorax. Surface of pronotum with dense foveiform punctures, not touching each other. Punctures on the sides and posterior angles as close as those on anterior angles. Discal punctures smaller and more dispersed than those of lateral portion, separated by approximately two or three times their diameter. Anteromedial punctures smaller and more dispersed than discal punctures. Posteromedial punctures usually separated by at least one diameter. Margin between anterior and lateral angles with row of small setae. Margin between lateral and posterior angles straight, with approximately the same length of margin between anterior and lateral angles. Hypomera with dense foveiform punctures at anterior portion and absent at posteromedial portion (Fig. 83); 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 (Fig. 83). Elytra. Lateral margins slightly curved outward (Fig. 110) and surface slightly irregular (rugose). Elytral striae with carinate margins clearly separated; strial punctures often elliptical, separated by irregular spacing (Fig. 84). Interstriae flattened, with foveiform punctures surrounded by approximately five well-defined shiny microtubercles. Foveiform punctures separated on elytral disc by approximately half 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 (Fig. 80). Apical carina or tubercle of second interstria inconspicuous. 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 smaller than the sum of lengths of apical carinae of fifth and sixth interstriae. Pseudepipleural carina incomplete, effaced medially (Fig. 80). Parameres symmetric and elongate, length equal to or longer than phallobase; in lateral view forming an angle greater than 60° with phallobase; apex rounded (Fig. 16). Lamella copulatrix (LC): subrectangular sclerites (Fig. 37). Fronto-lateral peripheral sclerite (FLP) as in Fig. 54.
Material studied. Holotype (BMNH) [examined] ♀: COLOMBIA (no locality given in original description). 1. [white label, handwritten]. 416; 2. [white label, printed in black]. 6745; 3. [white label, bordered in red, round]. Type; 4. [white label, handwritten]. longiceps / Reiche/ Colombie; 5. [white label, handwritten]. Deltochilum / valgum var. longiceps / Paulian/ Type.
Non-type material [1]: COLOMBIA: TOLIMA: Mariquita, XI.1995, F. Escobar (1 ♂ CEMT).
Sampling methods. un-baited pitfall trap [1].
Habitat. Colombia (Fig. 91), one specimen with label data "Bosque Seco".
Diagnosis and remarks (within the acropyge complex): foveiform punctures separated at the dorsal interocular surface by approximately one diameter (Fig. 61); foveiform punctures of pronotal disc separated by approximately two or three times their diameter; punctures of elytral striae often elliptical, separated by irregular spacing (Fig. 84); apical carina or tubercle of second elytral interstria inconspicuous; pseudepipleural carina incomplete, effaced medially (Fig. 80). The pattern of hypomera punctures on individuals of this species is also characteristic (Fig. 83). The following aedeagus characters are also diagnostic: parameres symmetric and elongate, length equal to or longer than phallobase; in lateral view forming an angle greater than 60° with phallobase; apex rounded (Fig. 16). Lamella copulatrix (LC): subrectangular sclerites (Fig. 37). Fronto-lateral peripheral sclerite (FLP) as in Fig. 54.
Escobar (2003) reported the feeding behavior of seven specimens from Colombia (Tolima), supposedly identified as D. valgum acropyge Bates. As far as we know, D. acropyge Bates inhabits only the Caribbean slope of Central America to Mexico. From Colombia we know only specimens of D. longiceps. Therefore, we belive that those specimens reported from Colombia are D. longiceps.
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 475-476, DOI: 10.11646/zootaxa.3925.4.1, http://zenodo.org/record/244795