Orphnus (Phornus) giganteus Paulian, 1948

Frolov, Andrey V. & Akhmetova, Lilia A., 2016, Revision of the subgenus Orphnus (Phornus) (Coleoptera, Scarabaeidae, Orphninae), European Journal of Taxonomy 241, pp. 1-20 : 4-6

publication ID

https://doi.org/ 10.5852/ejt.2016.241

publication LSID

lsid:zoobank.org:pub:FEBC79B8-0F1B-4D15-937D-7D35C45D1408

DOI

https://doi.org/10.5281/zenodo.3854788

persistent identifier

https://treatment.plazi.org/id/C4027A09-1406-555F-D377-FD99FB17B13B

treatment provided by

Valdenar

scientific name

Orphnus (Phornus) giganteus Paulian, 1948
status

 

Orphnus (Phornus) giganteus Paulian, 1948

Figs 1 View Fig A–M, 6

Diagnosis

Orphnus giganteus is easily distinguished from other Phornus species by the characteristic sculpture of the head and pronotum, small eyes, and parameres with excavations on the ventral side. From all species except for O. renaudi sp. nov. it also differs in having well developed wings.

Material examined

Holotype

ZAMBIA: ♂, with label “ N.W. Rhodesia [Zambia]” ( MNHN).

Paratype

DEMOCRATIC REPUBLIC OF CONGO: 1 ♀, Lulua, Kapanga, Oct. 1932 , F.G. Overlaet ( MRAC).

Additional material

DEMOCRATIC REPUBLIC OF CONGO: 5 ♂♂, Lulua, Sandoa , Nov. 1931, F.G. Overlaet ( MRAC); 1 ♂, same locality, Oct.–Dec. 1932, F.G. Overlaet ( MRAC); 3 ♂♂, 1 ♀, same locality, Oct. 1931, F.G. Overlaet ( MRAC); 1 ♂, same locality, Dec. 1930, F.G. Overlaet ( MRAC); 4 ♂♂, 2 ♀♀, same locality, 1 Nov. 1920, F.G. Overlaet ( MRAC); 2 ♂♂, 2 ♀♀, Lulua, Kapanga, Sep. 1933 , F.G. Overlaet ( MNHN); same locality, Oct. 1933, F.G. Overlaet, 1 ♂, 7 ♀♀ ( MRAC), 1 ♀ ( MNHN); 3 ♂♂, 3 ♀♀, same locality, Oct. 1932, F.G. Overlaet ( MRAC); 2 ♂♂, 3 ♀♀, same locality, Sep. 1932, F.G. Overlaet ( MRAC); 1 ♀, same locality, Nov. 1933, F.G. Overlaet ( MRAC); 1 ♂, 12 ♀♀, same locality, Nov. 1932, F.G. Overlaet ( MRAC); 3 ♀♀, same locality, Dec. 1931, F.G. Overlaet ( MRAC); 2 ♀♀, same locality, Dec. 1933, F.G. Overlaet ( MRAC); 1 ♂, same locality, Dec. 1932, F.G. Overlaet ( MRAC); Lulua, Tshibamba, Dec. 1931 , F.G. Overlaet, 2 ♂♂, 2 ♀♀ ( MRAC), 1 ♂ ( MCSNG); 1 ♂, same locality, Mar. 1932, F.G. Overlaet ( MRAC); 1 ♀, Katanga, Kafakumba , Dec. 1930, F.G. Overlaet ( MRAC); 1 ♂, same locality, Oct. 1931, F.G. Overlaet ( MRAC); 1 ♀, same locality, Dec. 1932, F.G. Overlaet ( MRAC); 1 ♀, same locality, Oct. 1932, F.G. Overlaet ( MRAC); 1 ♀, same locality, Jan. 1931, F.G. Overlaet ( MRAC); 1 ♀, Katanga, Elisabethville [ Lubumbashi ], Nov. 1911, ( MRAC); 1 ♂, Lulua, Tshibalaka , 9 Nov. 1933, F.G. Overlaet ( MRAC); 1 ♀, same locality, Oct. 1933, F.G. Overlaet ( MRAC); 2 ♀♀, same locality, Dec. 1933, F.G. Overlaet ( MRAC); 2 ♂♂, Lulua, Lunkinda River, Sep. 1933, F.G. Overlaet ( MRAC); 2 ♂♂, Luashi , Nov. 1938, F. Freyne ( MRAC); 1 ♀, Sankuru, Gandajika , Dec. 1953, P. de Francquen ( MRAC); 1 ♀, Kasai, Lula , 1958, A.J. Jobaert ( MRAC); 1 ♂, Lulua, Katombe , 13 Nov. 1933, F.G. Overlaet ( MNHN); 1 ♂, Lulua, Luiza River, 15 Oct. 1933 F.G. Overlaet ( MRAC); 1 ♀, same locality, 16 Oct. 1933, F.G. Overlaet ( MRAC); 1 ♂, Lomami, Kamina , 1931, R. Massart ( MHNG); 1 ♂ and 2 ♀♀, Kaniama , 1931, R. Massart ( MRAC); 1 ♂, Lulua, Kalani River [not traced], 14 Oct. 1933, F.G. Overlaet ( MHNG). ZAMBIA: Abercorn [ Mbala ], 15 Dec. 1943, H.J. Bredo, 6 ♂♂, 2 ♂♂ ( MRAC), 1 ♂ ( IRSNB); 2 ♂♂, 1 ♀, same locality, 19 Jun. 1943, H.J. Bredo ( MRAC); 1 ♂, same locality, Dec. 1943, H.J. Bredo ( MRAC); 2 ♂♂, same locality, Nov. 1943, H.J. Bredo ( MRAC); 1 ♀, Mpika , Jan. 1908, S. Neave ( MRAC); 2 ♂♂, 1 ♀, with the same locality as holotype ( MNHN).

Description

Male ( Fig. 1A View Fig )

Body length 10.0– 14.5 mm. Colour uniformly brown to black.

Anterior margin of frontoclypeus slightly convex in middle, serrate and setose, without distinct border ( Fig. 1C View Fig ). Frontoclypeus with process near anterior margin, varying for conical tubercle to small horn ( Fig. 1D View Fig ). Eye tubercles more or less developed. Frontoclypeus rugose anteriorly up to eye tubercles, including base of frontoclypeal process, convex and finely but densely punctate behind eyes.

Eyes small: width about 1/15 distance between eyes in dorsal view. Antennae 10-segmented, with malformed segments. In the majority of specimens antennomeres 5 and 6 partly fused ( Fig. 1G View Fig ). In one specimen the malformations are asymmetrical: the left antenna has antennomeres 5–7 partly fused ( Fig. 1E View Fig ) while the right has antennomeres 3–5 partly fused ( Fig. 1F View Fig ).

Pronotum widely rounded laterally, as wide as elytra ( Fig 1M View Fig ). Anterior border wide, with somewhat undulate or serrate posterior margin. Basal border narrow, keel-shaped, separated from pronotal disc by deep groove with irregular punctation. Pronotal disc anteromedially flattened, with two distinct rounded tubercles in majority of specimens ( Fig. 1A View Fig ). Pronotum covered with dense rounded punctures.

Scutellum subtriangular, rounded apically, about 1/12 length of elytra.

Elytra 1.1 times longer than wide, with distinct humeral humps. Elytra widest in middle, lateral margins almost parallel in basal half. First seven striae feebly distinct as shallow grooves, somewhat shagreened in most specimens. Elytral intervals covered with relatively smaller punctures, much finer than those on pronotum.

Macropterous.

Stridulatory field: carinae separated by 1/39 length of field in central ¼ rd ( Fig. 1K View Fig ).

Abdominal sternite 8 medially longer than sternites 6 and 7 combined; sternite 6 about as long as sternite 7. Pygidium almost invisible from above, with slightly truncate apex. Plectrum triangular with rounded apex, wider than long ( Fig. 1J View Fig ). Lateral plate of second abdominal sternite is less distinct than in other Phornus species, situated more laterally and appears as sharp lateral edge of sternite.

Aedeagus with relatively long parameres (0.68 length of phallobase), somewhat angulate and rounded apically in dorsal and lateral view ( Fig. 1 View Fig H–I), with excavations on ventral side of parameres.

Female ( Fig. 1B View Fig )

Female differs from the male in having a relatively smaller pronotum without tubercles, frontoclypeus uniformly densely punctured, without convexity and process, prothoracic spur, finer stridulatory area (carinae separated by 1/57 of field in central ¼ rd, Fig. 1L View Fig ), smaller plectrum, less distinct abdominal lateral plate, and pygidium with rounded apex. Body length of examined specimens varies from 11.0– 14.5 mm.

Distribution

O. giganteus is known from a number of localities chiefly on the Katanga Plateau ( Fig. 6 View Fig ).

MNHN

France, Paris, Museum National d'Histoire Naturelle

MRAC

Belgium, Tervuren, Musee Royal de l'Afrique Centrale

MCSNG

MCSNG

MHNG

Switzerland, Geneva, Museum d'Histoire Naturelle

IRSNB

Belgium, Brussels, Institut Royal des Sciences Naturelles de Belgique

MNHN

Museum National d'Histoire Naturelle

MRAC

Musée Royal de l’Afrique Centrale

MHNG

Museum d'Histoire Naturelle

IRSNB

Institut Royal des Sciences Naturelles de Belgique

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Orphnidae

Genus

Orphnus

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