Dichotomius (Selenocopris) gamboaensis Howden and Young, 1981

Valois, Marcely C., Silva, Fernando A. B. & Vaz-de-Mello, Fernando Z., 2022, A taxonomic revision of the globulus species group of Dichotomius Hope, 1838 (Coleoptera: Scarabaeidae: Scarabaeinae), Journal of Natural History 56 (1 - 4), pp. 119-147 : 137-139

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https://doi.org/ 10.1080/00222933.2022.2046887



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Dichotomius (Selenocopris) gamboaensis Howden and Young, 1981


Dichotomius (Selenocopris) gamboaensis Howden and Young, 1981

( Figures 1 View Figure 1 (e), 3(b,d), 4(i,j), 5(g,l) and 6))

Dichotomius gamboaensis Howden and Young, 1981: 128 ; Krajcik 2006: 54; 2012: 91; Kohlmann and Solís 1997: 362; 364; 366; Vaz-de-Mello and Nunes 2016: 299.


Dichotomius gamboaensis and D. berthalutzae sp. nov. share the following combination of characters: pronotal disc covered with umbilicate punctures ( Figure 1 View Figure 1 (b,e)); elytral interstriae with shagreened microsculpture and distinct smooth dots along medial region (as in Figure 3 View Figure 3 (i)); dorsal surface of paramera with a longitudinal carina at least as long as onethird of paramera in dorsal view ( Figure 3 View Figure 3 (c,d,i,j)); and hook-like projections on inferior part of ME separated by a C-shaped emargination ( Figure 5 View Figure 5 (c,g)). However, D. gamboaensis can be distinguished from D. berthalutzae sp. nov. by the clypeofrontal region with a central, apically bifurcate knob; anterior declivity of the pronotum onefourth as long as pronotal disc; abdominal ventrites narrowed medially ( Figure 3 View Figure 3 (b)); and male with pygidium rounded at apex.

Redescription (male)

Body length: 13–14 mm. Dorsum black, barely shiny ( Figure 1 View Figure 1 (e)). Head: clypeal edge bidentate, teeth rounded, separated by a shallow V-shaped emargination. Clypeogenal junction rounded, shallowly nochted. Surface with different-sized ocellate punctures, more sparsely distributed on anterior clypeal region. Clypeogenal suture present. Cephalic process produced into a small central tubercle. Antennal club with light brown tumescence. Thorax: pronotum approximately twice wider than long ( Figure 1 View Figure 1 (e)). Pronotal disc convex, anteromedian region with a shallow central excavation; surface of the disc with dense ocellate punctures equally spaced by half their diameter, punctures on anterior angle more sparse. Whole surface of hypomera covered with ocellate punctures; anterior and lateral regions with punctures bearing short orange setae. Prosternum filled with ocellate punctures. Mesoventrite covered with ocellate punctures usually bearing short orange setae. Lateral region of metaventrite with ocellate punctures, disc smooth; on anterior region, punctures usually bearing short setae. Meso-metaventral suture distinct. Anterior region of metaventrite as wide as two-thirds the length of metafemora. Mid-longitudinal sulcus indistinct. Lateral lobes of metaventrite with ocellate punctures larger than those on anterior region. Elytra: slightly convex in lateral view. Humeral callus distinct. Striae thin and with ill defined punctures, spaced by twice their diameter. Interstriae I–VII convex, barely shiny. Legs: protibial spur curved at apical fifth. Metatibial spur deeply emarginate apically. Ventral surface of the profemora covered with coarse setiferous punctures over their entire extension. Ventral surface of the mesofemora with ocellate puncture at apical third, near trochanter. Ventral surface of the metafemora with ocellate punctures at apical half. Meso and metafemora bearing a thin longitudinal groove along posterior margin, wider on apical half. Abdomen: sixth ventrite twice longer than fifth. Ventrites covered with ocellate punctures at lateral regions, punctures at medial region in a single row along anterior edge. Pygidium longer than wide, convex medially. Surface of the pygidial disc with ocellate punctures concentrated along anterior half, and spaced by half their diameter. Apex of the pygidium margined. Tegmen: in dorsal view, paramera rectangular, twice longer than its width medially, apex rounded; inner edges close to each other at basal third ( Figure 4 View Figure 4 (i)). Apical half significantly narrower than base in lateral view. Dorsal surface of paramera with a strong pre-apical longitudinal carina at approximately apical half; margin of the carina serrate ( Figure 4 View Figure 4 (i)). Ventral sclerotised membrane between paramera thinner at basal third; angulate at lateral portions ( Figure 4 View Figure 4 (j)). Endophallus: ME inferior projections separated by a broad C-shaped emargination ( Figure 5 View Figure 5 (g)). ME with a longitudinal fold at the median superior region ( Figure 5 View Figure 5 (g)). A and SA endophallites thin, C-shaped in lateral view; SA endophallite with reticulate texture inferiorly ( Figure 5 View Figure 5 (l)). FLP endophallite C-shaped in lateral right view, inferior region shorter than superior one; surface of the C-shaped region with irregular projections ( Figure 5 View Figure 5 (l)). SRP endophallite approximately V-shaped ( Figure 5 View Figure 5 (l)). Female: differs from male by clypeal teeth larger and acute, separated by V-shaped emargination. Pronotum lacking anterior declivity or distinct mid-longitudinal sulcus. Lateral teeth of the protibia larger. Pygidial disc swollen and sparsely punctate. Sixth abdominal ventrite 3 times longer than fifth.

Type material examined

Holotype of Dichotomius gamboaensis ♂ [ USNM]: ‘ Panama. Canal Zone / Gamboa /Limbo Hunt Club. 23–24.X.1975 OPYoung. Tapir feces trap’ // ‘ HOLOTYPE Dichotomius (L.) gamboensis sp. nov’.

Additional material examined

PANAMA: Prov. Cerro Azul: (850 m) . 17 July 1998. M. Hardy (1♀ CEMT); Cocle: El Valle . H. Campestre . 600 m. 24 May 1999. D. Curoe (1♂ 3♀♀, CEMT) .


Smithsonian Institution, National Museum of Natural History














Dichotomius (Selenocopris) gamboaensis Howden and Young, 1981

Valois, Marcely C., Silva, Fernando A. B. & Vaz-de-Mello, Fernando Z. 2022

Dichotomius gamboaensis

Vaz-de-Mello FZ & Nunes RV 2016: 299
Krajcik M 2012: 91
Krajcik M 2006: 54
Kohlmann B & Solis A 1997: 362
Howden H & Young OP 1981: 128
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