Bothynus cribrarius Duarte and Grossi 2016
Creators: name: Duarte, Paulo R. M.
name: Dupuis, Fabien
name: Grossi, Paschoal C.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Bothynus
Bothynus cribrarius

description: Bothynus cribrarius (Fairmaire, 1878)
(Figures 2 (b), 3(c), 13(c), 14(c), 15(d), 18(b), 22)
Scaptophilus cribrarius. Fairmaire 1878: 266 (original combination)
Bothynus cribrarius. Arrow 1937b: 40 (catalogue, as new combination); Blackwelder 1944: 255 (Checklist); Endrödi 1969: 111 (identification key), 124–125 (description, lectotype designation, distribution); Endrödi 1985: 270 (identification key); Krajcik 2005: 38 (checklist); Duarte and Grossi 2016: 291–292 (male description, illustrations of male [Figures 1–3, Figures 7–9], illustrations of female [Figures 4–6]).
Diagnosis
Bothynus cribrarius resembles B. laticifex and B. cylindricus at first glance due to the elongated body aspect, pronotal cavity of male shallow and small, and the inner protarsal incised. However, B. cribrarius is distinguished by the following combination of characters: posterior width of clypeus about 4.0–4.7 times wider than anterior; surface of metaventrite with dense setae, leaving the integument poorly visible (Figure 18 (b)); ventral surface of metafemora with presence of moderated setae (Figure 18 (b)); inner protarsal claw of male with branches subequal in length (B. laticifex has the inner branch shorter than outer one); parameres smooth (Figure 13 (c)) (B. cylindricus has the parameres with well-impressed punctures instead); female differs by tergite 8 with dense setae (similar to those of B. ascanius (Figure 19 (e)). Furthermore, B. cribrarius exhibits an opaque aspect on the dorsal surface of body along with a microreticulated integument (observed at 50× high magnification), representing a unique combination within the ascanius group.
Type material
Lectotype female, labelled: (a) ‘Br’ [handwritten]; (b) ‘ Scaptophilus,/cribrarius/ame/Brasil’ [handwritten]; (c) ‘MUSEUM PARIS/Collection León Fairmaire/1906’ [light green label]; (d) ‘TYPE’ [red label]; (e) ‘ Lectotypus / Bothynus /cribrarius/Fairm/Endrödi’ [label bordered in red, partly handwritten]; (f) ‘HOLOTYPE’ [red label]; (g) ‘MNHN/EC7107’ (MNHN) (Figure 2 (c)).
Additional material
BRAZIL: Rio de Janeiro: Itatiaia, 20.iv.1933, Col. F. Zikán. – 1 male (FIOC); Itatiaia, Parque Nacional do Itatiaia, Casa do Pesquisador, 27.ii–01.iii. 2012, 750 m, M. Cupelo leg. – 1 female (MNRJ) [not destroyed by the 2018 fire]; Resende, Serrinha do Alambari, ii.2010, U. Caramaschi and H. de Niemeyer legs. – 1 male (MNRJ) [not destroyed by the 2018 fire]; no data – 1 female (FDPC).
Male redescription (Figure 3 (c))
Length: 19.9–21.1 mm. Width: 10.8–11.5 mm. Colour: From nearly completely reddish brown to dark reddish; dorsal surface with opaque aspect, poorly shining. Head: Clypeus subtriangular, posterior width about 4.0–4.7 times wider than anterior, slightly constricted laterally towards anterior half; surface transversely rugopunctate, glabrous; anterior teeth conical, pointed apically. Frontoclypeal carina weakly marked, slightly arched. Frons coarsely rugopunctate, scarcely setose on sides, glabrous on disc. Interocular width equals 4.8 transverse eye diameters. Mouthparts: Mandible with apical and medial teeth subtriangular, with apex narrow rounded; basal tooth subtriangular, smaller. Labium subtriangular, densely setose; basal half with a middle, longitudinal pit. Antennae: Club about 1.5 times longer than antennomeres 2–7 combined. Prothorax: Pronotal tubercle strong, conical; cavity shallow, transversely rugose, oval, narrow, confined on anterior disc; cavity transversely rugose; pronotal sides covered with large, deep, ocellate punctures, denser near margins, gradually becoming smaller towards posterior disc; punctures on disc from minute to small. Pterothorax: Scutellar plate subtriangular, with 6–9 small punctures scattered on sides. Elytral surface bearing poorly apparent striae; punctures large, deep, ocellate, about 1–2 puncture diameters apart. Meso- and metaventral surfaces poorly apparent, hidden by dense setae. Legs: Inner protarsal claw incised, with both branches subequal in length. Ventral area of protarsomere 5 with a small, triangular, subapical ventrolateral process. Meso- and metafemur setose ventrally (Figure 18 (b)). Abdomen: Tergite 7 with stridulatory apparatus formed by 2 bands of numerous finely marked striae, longitudinally interrupted by a narrow midline. Tergite 8 densely rugose, covered with scarce setae on sides. Sternites 4–8 densely setose. Aedeagus: Parameres, in dorsal view, smooth; basal half rounded laterally, apical half strongly constricted lateroventrally, apical plate elongated (Figure 13 (c)). Parameres, in lateral view, arched dorsally, ventrally with a small process at basis; subapical area behind the lobes excavated, apex rounded (Figure 14 (c)).
Female redescription (Figure 15 (d))
Length: 22.5 mm. Width: 12.5 mm. Similar to male, except in the following: Colour: Head, pronotum and legs dark reddish; elytra reddish brown. Prothorax: Pronotum weakly convex in lateral view; anterior tubercle small; cavity absent; punctures on anterior disc large, oval, transverse, contiguous. Legs: Inner protarsal claw simple, similar to outer claw. Protarsomere 5 without ventral process. Abdomen: Tergite 8 densely setose.
Distribution
Brazil (Rio de Janeiro) (Figure 22).
Remarks
Bothynus cribrarius is an uncommon species with only six known exemplars in the collections until now, including the two type specimens. The known distribution of the species is restricted to a small Atlantic Forest area from Rio de Janeiro, south-eastern Brazil.
description: Published as part of Duarte, Paulo R. M., Dupuis, Fabien & Grossi, Paschoal C., 2025, Taxonomic revision of the Bothynus ascanius (Kirby, 1819) (Coleoptera: Melolonthidae: Dynastinae) species group, pp. 663-737 in Journal of Natural History 59 (9 - 12) on pages 677-685, DOI: 10.1080/00222933.2025.2456579, http://zenodo.org/record/14971553