Digitonthophagus dilatatus Génier, Genier, 2017

Génier, François & Moretto, Philippe, 2017, Digitonthophagus Balthasar, 1959: taxonomy, systematics, and morphological phylogeny of the genus revealing an African species complex (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 4248 (1), pp. 1-110: 59-61

publication ID

http://doi.org/ 10.5281/zenodo.439444

publication LSID

lsid:zoobank.org:pub:71F0AC03-C1FB-40AB-8532-99A638FC91E9

DOI

http://doi.org/10.5281/zenodo.5490090

persistent identifier

http://treatment.plazi.org/id/28F9FCFD-2012-4B76-B546-B444F54327D9

taxon LSID

lsid:zoobank.org:act:28F9FCFD-2012-4B76-B546-B444F54327D9

treatment provided by

Plazi

scientific name

Digitonthophagus dilatatus Génier
status

new species

Digitonthophagus dilatatus Génier   , new species

http://zoobank.org/urn:lsid:zoobank.org:act:28F9FCFD-2012-4B76-B546-B444 F54327 View Materials D9 ( Figs. 18 View FIGURES 15 – 18 , 45–46 View FIGURES 39 – 46. 39, 41, 43, 45 , 66 View FIGURES 63 – 70 , 82 View FIGURES 79 – 86 , 109–110, 130, 168–170; Map 13)

Type locality. Forêt de Sorobouli (11°47’44”N 02°53’25”W), 270 m, Sanguié , Burkina Faso. GoogleMaps  

Diagnosis. Male cephalic horns granulate internally at apex ( Fig. 46 View FIGURES 39 – 46. 39, 41, 43, 45 ); males with pronotal anterior angles surface concave, produced anteriorly ( Fig. 45 View FIGURES 39 – 46. 39, 41, 43, 45 ); FLP sclerite ventral portion with a single carina ( Fig. 170 View FIGURES 159 – 170 ); SA sclerite apex interrupted much before apex of apical portion of FLP sclerite ( Figs. 168–169 View FIGURES 159 – 170 ).

Description. Holotype ♂ ( Fig. 18 View FIGURES 15 – 18 ). Measurements. Length 12.0 mm, width 7.0 mm. Head ( Figs. 45–46 View FIGURES 39 – 46. 39, 41, 43, 45 ). Anterior clypeal edge straight on median seventh and appearing semicircular in dorsal view; clypeofrontal carina broadly arcuate and interrupted at gena; vertex lacking median tubercle, surface with punctures fine to small, separated by one to four diameters. Horns rather long, distinctly arcuate and divergent in frontal view, parallel sided on basal four-fifths and abruptly tapering externally and narrower on apical sixth; posterointernal edge unmodified basally; apicointernal surface with few, coarse granules; genal edge slightly upturned and simply arcuate on anterior third, in line with clypeal edge. Pronotum ( Fig. 66 View FIGURES 63 – 70 ). Surface with granulate punctures restricted to anterior half medially, with distinct umbilicate punctures on posterior half of disc; punctures distinct posterolaterally, with distinct minute punctures throughout. Anteromedian tubercle atrophied, forming an obtuse angle in lateral view; median longitudinal sulcus well-defined but narrow; surface behind the eyes slightly concave, surface of anterior angles concave with anterior angles produced forwardly; anterior half of lateral edge sinuous in dorsal and lateral view; posterior angles unmodified and simply arcuate in dorsal view. Anterior hypomeral ridge straight on most of its length and abruptly arcuate on anterior third, anterior hypomeral depression surface darker in color. Elytra ( Fig. 18 View FIGURES 15 – 18 ). Intervals 2 and 4 lacking fine granules from base to apex. Legs. Protibial apicointernal tooth enlarged, with dorsal ridge extending to apex. Aedeagus ( Fig. 130 View FIGURES 119 – 134 ). Parameres with dorsal and ventral edges slightly diverging toward apex in lateral view. Internal sac sclerites ( Figs. 168–170 View FIGURES 159 – 170 ). Axial sclerite short, angular and extending into a point apically. Subaxial sclerite, large basally and abruptly reduced, extending straight and approximately in line with apex of right lateral fold of frontolateral peripheral sclerite, with fine and scattered villi. Frontolateral peripheral sclerite basoventral apophysis well developed; a single rather large medioventral carina present; right lateral fold produced into a rather small everted and open apically conical process with irregular apical edge located behind oblique right lateral edge of apical lobe; left lateral lobe membranous, slightly developed; subapicodorsal lobe membranous, not reaching anterior edge, apex set on left side in dorsal view; apical lobe truncate apically and directed obliquely on left side, apical villi regular in shape; subapicoventral lobe small, acute apically, short not reaching apical edge of apical lobe.

Variation. Measurements (42 ♂♂, 83 ♀♀). Length: male 8.5–12.0 mm (10.5 ± 0.9 mm), female 7.5–12.0 mm (10.1 ± 0.8 mm). Female allotype. Cephalic outline in dorsal view as in Fig. 82 View FIGURES 79 – 86 ; vertex with a broadly arcuate transverse carina, dorsal edge broadly arcuate in frontal view, lateral portion gradually sloping down posteriorly; anterior pronotal tubercles well developed, external lateral edges slightly widening toward apex in dorsal view, anterolateral surface simply convex, anterosuperior edge slightly arcuate in dorsal view (Fig. 109), lateral portion of anterosuperior edge slightly upturned (Fig. 110). Protibia short, with external teeth more robust.

Primary type data. Holotype ♂ ( CMNC): [ BURKINA FASO: SANGUIÉ / Forêt de Sorobouli , 270m / 11̊47’44”N 0 0 2̊53’25”O / 13.VIII.2005, F. Génier / zone soudanienne sud / piège excr. humain, 2005-14]; [COLÉOPTÈRES / DU / BURKINA FASO / BF015361 View Materials ] barcode label; [HOLOTYPE ♂ / Digitonthophagus   / dilatatus   n.sp. / des. F. Génier, 2016] red card.  

MAP 13. Distribution of Digitonthophagus dilatatus   .

Material examined (57 ♂♂, 93 ♀♀), distribution (Map 13): BURKINA FASO   : CENTRE-OUEST, Forêt de Sorobouli [= Forêt Classée de Baporo ], 270 m (11°47'44''N, 2°53'25''W), 10–15.viii.2005, P. Moretto— 78 ♀♀, 30 ♂♂ (108 paratypes) ( FGIC, PMOC) GoogleMaps   ; BALÉ, Boromo, 250 m (11°45'6''N, 2°51'58''W), 10.viii.2005, F. Génier (2005-10)—1 ♀, 1 ♂ (paratypes) (FGIC); KOMPIENGA, Pama, 230 m (11°17'N, 0°42'59''E), 24.viii.2005, F. Génier (2005-44)—3 ♂♂ (3 paratypes) (FGIC); SANGUIÉ, Forêt de Sorobouli, 270 m (11°47'44''N, 2°53'25''W), 13.viii.2005, F. Génier (2005-14)—1 ♀, 1 ♂ (holotype, allotype) (CMNC); Forêt de Sorobouli, 270 m (11°47'44''N, 2°53'25''W), 13.viii.2005, F. Génier (2005-15)—2 ♀♀, 1 ♂ (paratypes) (FGIC); Forêt de Sorobouli, 270 m (11°47'44''N, 2°53'25''W), 28.vii.2006, F. & S. Génier (2006-83)—1 ♂ (paratype) (FGIC).; CAMEROON: EXTREME NORTH, Maroua (10°35'N, 14°19'E), 4.vii.1978, [anonymous] GoogleMaps   —1 ♂ (paratype) (MNHN); Waza (11°24'N, 14°34'E), 18.viii.2006, C. Vanderbergh— 2 ♂♂ (2 paratypes) ( FGIC, PMOC) GoogleMaps   ; Waza National Park (11°15'N, 14°39'E), 18.viii.2006, C. Vanderbergh— 5 ♀♀, 5 ♂♂ (10 paratypes) ( FGIC, PMOC) GoogleMaps   ; CHAD: N’DJAMENA, Farcha (12°7'N, 14°59'E), vi.1968, [anonymous]— 1 ♀, 1 ♂ (paratypes) ( MNHN) GoogleMaps   ; Farcha (12°7'N, 14°59'E), 28.vi.1967, [anonymous]— 1 ♀, 2 ♂♂ (3 paratypes) ( MNHN) GoogleMaps   ; Fort Lamy [= N’Djamena ] (12°7'N, 15°3'E), 17.vii.1958, J. Mateu— 1 ♂ (paratype) ( FETC); CÔTE D’IVOIRE GoogleMaps   : SAVANES, M’banto, Boundiali , 395 m (9°34'10.4''N, 6°40'56.5''W), 13–15.vii.2013, P. Moretto— 2 ♀♀, 5 ♂♂ (7 paratypes) ( FGIC, PMOC) GoogleMaps   ; GHANA: UPPER EAST, Bolgatanga (10°47'N, 0°5'W), 20.xi.2002, Bowku— 2 ♀♀, 2 ♂♂ (4 paratypes) ( OMOC) GoogleMaps   ; NIGERIA: KWARA, Bussa (8°51'24''N, 5°13'9''E), 4.v.1962, D.C. Eidt— 1 ♂ (paratype) ( CNC) GoogleMaps   .

Etymology. Dilatatus   is a Latin adjective pertaining to the development of the anterior pronotal angles of welldeveloped males of this species. This development is unique in the genus.

Natural history. The known distribution pattern of this species suggests that it is endemic to the Sudanese savanna. Interestingly, all specimens with data were collected at light or in pitfall traps baited with human dung, no specimens were collected in ruminant dung. Additional observations are required to confirm that it is a nonruminant dung specialist.

Remarks. Externally, this species can be confused with D. fimator   in West Africa. However, in addition to the characters given, the parameres are smaller and approximately parallel sided in lateral view as opposed to being wider and divergent in lateral view in D. fimator   .

FGIC

Francois Genier

MNHN

Museum National d'Histoire Naturelle

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes