Coelosis bicornis ( Leske 1779 )

Alvarez, Héctor Jaime Gasca, da, Claudio Ruy Vasconcelos, Fonseca & Ratcliffe, Brett C., 2008, Synopsis of the Oryctini (Coleoptera: Scarabaeidae: Dynastinae) from the Brazilian Amazon, Insecta Mundi 2008 (61), pp. 1-62 : 5-8

publication ID

https://doi.org/ 10.5281/zenodo.5352440

persistent identifier

https://treatment.plazi.org/id/03FC1A09-FFD9-F76E-FF02-49210B6DFC88

treatment provided by

Felipe

scientific name

Coelosis bicornis ( Leske 1779 )
status

 

Coelosis bicornis ( Leske 1779)

( Fig. 1-7 View Figure 1-6 View Figure 7 )

Scarabaeus bicornis Leske 1779: 418 View in CoL

Geotrupes bicornis Fabricius 1801: 9 (redescription)

Coelosis bicornis recifensis Bourgin 1944: 137 (synonym, described as subspecies)

Scarabaeus codrus Olivier 1789: 179 View in CoL (synonym)

Coelosis hippocrates Burmeister 1847: 216 (synonym)

DESCRIPTION. Length: 26.1-30.5 mm (males); 23.6-25.0 mm (females). Width: 13.7-15.1 mm (males); 13.1-15.0 mm (females). Color: Light to dark reddish brown.

Males. Head: Frons with recurved horn, apex acuminate, posterior margin with small, tooth-like swelling near apex. Male minors with horn slightly recurved. Eye canthus rounded at apex, anterior margin crenulate with row of setae. Clypeus subtriangular, surface strongly rugose, apex with 2 teeth. Mandibles with 3 strong, sharp teeth. Antenna with 10 segments, club subequal in length to segments 2- 7. Pronotum: Surface in central third smooth, with deep, small punctures, sides strongly rugose. Male majors ( Fig. 2 View Figure 1-6 ) with 2 subparallel horns, curving forward. Fovea prominent, surface with small punctures. Male minors with protuberance only. Elytra: Surface between suture and humerus with 5-8 punctate striae; punctures deep, ocellate. Apex with 2 small protuberance. Pygidium: Surface strongly setose, punctate. In lateral view, strongly convex. Legs: Protibia tridentate. Apex of metatibia weakly crenulate, lacking teeth. Metatarsus with apex of first tarsomere triangularly produced, spur-like. Venter: Prosternal process long, triangular, with prominence on posterior surface ( Fig. 3 View Figure 1-6 ). Parameres: Basal region long, central region weakly concave in lateral view, apical region elongated and thin, apex narrow, recurved ( Fig. 5-6 View Figure 1-6 ).

Females. As males except in the following respects: Head: Frons with surface strongly rugose, with small tubercles. Pronotum: Surface lacking horns or tubercles, completely punctate ( Fig. 4 View Figure 1-6 ). Pygidium: Surface slightly punctate, densely and finely setose.

DIAGNOSIS. Coelosis bicornis can be distinguished by the two subparallel horns, clypeus with two teeth, tridentate mandibles, and a prosternal process with a strong prominence on the posterior surface.

DISTRIBUTION. Coelosis bicornis is widely distributed in South America, occurring from Colombia to the south of Argentina.

LOCALITY RECORDS. ( Fig. 7 View Figure 7 ) 19 specimens examined (13 males, 6 females). Specimens were seen from the following collections : INPA, CZPB, MPEG, UNSM.

MATO GROSSO (3): Barra do Tapirapé. PARÁ (10): Alter do Chão, Belém (Utinga), Tucuruí (Rio Tocantins, Ilha Tocantins); Parque Indígena Tumucumaque (Rio Parú de Leste), alto Tapajós (Rio Cururú). RONDÔNIA (5): Ariquemes. RORAIMA (1): Amajari (Ilha de Maraca, Rio Uraricoera).

TEMPORAL DISTRIBUTION. January (2), February (1), April (1), June (1), July (3), August (2), September (3), November (6).

NOMENCLATURAL REMARKS. Coelosis bicornis was described by Leske in 1779. Burmeister (1847) recognized Coelosis hippocrates , described by Blanchard in 1846, as a synonym of C. bicornis . In subsequent works, Bourgin (1944) and Endrödi (1976) considered C. hippocrates and C. biloba as different species. In a phenetic analysis, Iannuzzi and Marinoni (1995) indicated that the number of different characters between C. hippocrates and C. bilo ba was small. It seems necessary for more phylogenetic research to determine the validity of C. hippocrates Blanchard as a species.

BIOLOGY. Nothing is known of the life history of C. bicornis and of other species of the genus; most available information refers to C. biloba . Larvae presumably feed on organic matter in rotten trunks ( Iannuzzi and Marinoni 1995). Adults can be collected using light traps. Coelosis bicornis occurs from sea level to about 200 meters in elevation, and it is associated with ombrophilous forests, areas of degraded vegetation, and flooded areas.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Dynastidae

Genus

Coelosis

Loc

Coelosis bicornis ( Leske 1779 )

Alvarez, Héctor Jaime Gasca, da, Claudio Ruy Vasconcelos, Fonseca & Ratcliffe, Brett C. 2008
2008
Loc

Coelosis bicornis recifensis

Bourgin, P. 1944: 137
1944
Loc

Coelosis hippocrates

Burmeister, H. C. C. 1847: 216
1847
Loc

Geotrupes bicornis

Fabricius, J. C. 1801: 9
1801
Loc

Scarabaeus codrus

Olivier, G. A. 1789: 179
1789
Loc

Scarabaeus bicornis

Leske, N. G. 1779: 418
1779
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