Ommatius (Pygommatius) grossus, Scarbrough & Marascia, 2003

Scarbrough, Aubrey G. & Marascia, Claudio G., 2003, Revision of Ommatius Wiedemann (Diptera: Asilidae). IV. Pygommatius subgen. nov. with twenty-five Afrotropical species, Zootaxa 228 (1), pp. 1-94 : 35-37

publication ID

https://doi.org/ 10.11646/zootaxa.228.1.1

publication LSID

lsid:zoobank.org:pub:AC9F77DE-F702-4620-B756-D753E77FBC73

DOI

https://doi.org/10.5281/zenodo.5019063

persistent identifier

https://treatment.plazi.org/id/03A9FF3D-FFF8-FFE8-9D15-5948FBA7C0DC

treatment provided by

Felipe

scientific name

Ommatius (Pygommatius) grossus
status

sp. nov.

Ommatius (Pygommatius) grossus View in CoL , sp. n.

Figs. 10 View FIGURES 1­10 , 24 View FIGURES 21­28 , 134­138 View FIGURES 134­138

Male. Black. Length, body 12.8­13.3 mm; wing 9.7­10.0 mm. Head: Face wide, produced anteriorly, gently rounded from base of antenna to epistomal margin; yellow tomentose with abundant long setae, yellow or black; 8­9 thin, black bristles present, pencil­like bristles yellow or black; 1.0:4.6­1.0:4.7. Antenna black setose, 3­4 bristly setae project to apex of flagellum. Frons yellowish­brown to brown tomentose, setae mostly yellow, sparse black setae present. Ocellar tubercle with 5­6 long, black, bristly setae, all about same length, 2 posterior setae thickest. Occiput with several black postocular bristles, longest with apex one­third to half distance toward ocellar tubercle.

Thorax: Mesonotum dorsally mostly brown tomentose, margins yellow, with mostly black setae; 4 lateral and 3­4 dorsocentral bristles, most of latter thin, posterior bristle thickest, all black; long, mostly yellow setae between rows posteriorly. Scutellum gray tomentose with scattered yellow setae and 2 black marginal bristles, setae subequal to bristles. Pleuron gray tomentose with mostly scattered, yellow setae, anepisternum with sparse, black setae; katatergal bristles yellow or black. Halter yellow.

Wing ( Fig. 10 View FIGURES 1­10 ): Largely dense microtrichose, sparse in basal cells behind veins. Cell r 4 with R 4 slightly convex at wing margin. Apex of cell m 3 slightly arched, perpendicular to wing axis, near r­m.

Leg: Coxae black, gray tomentose, white setose. Hind trochanter with 2 long, slender, yellow bristles, curved 90 o, slender with a slightly swollen apex. Femora and tibiae yellow setose, long posteriorly or laterally, somewhat shaggy with setae of irregular lengths and distribution. Fore and middle femora brown anteriorly and dorsally, brown­yellow to yellow ventrally, yellow extends posteroventrally; hind femur mostly yellow, apical fifth to fourth brown. Fore femur ( Fig. 24 View FIGURES 21­28 ) ventrally with 3­4 thick, yellow bristles of uniform length basally. Middle femur 5­6 black bristles aligned anteriorly; basal half slightly concave and abundant yellow setae ventrally, bristles absent. Hind femur anteriorly with a row of several stout bristles, mixed long, thin and bristly yellow setae, longer anterobasal setae slightly wavy; abundant setae ventrally, anteroventral bristles absent; several posteroventral bristles present, yellow or black, those basally thickest; 1.0:5.4­1.0:5.5. Fore tibia with thin lateral fringe of long setae and thin bristles, most yellow, 1­3 basal bristles thick, black. Middle tibia laterally with several thin brown bristles. Hind tibia with narrow apex brown, and moderately long, yellow setae posteriorly. Tarsi with basal 2 tarsomeres yellow, narrow apex of second and remaining tarsomeres brown; fore and middle tarsi, sometimes hind tarsus, with yellow bristles.

Abdomen: Light brown to brown­yellow tomentose with mostly yellow setae; tergites 5­8 laterally with abundant setae, mostly yellow, short and aligned on margin of tergite 5, abundant longer and shaggy on 6­7, yellow and black or black on 8. Sternites 3­5 with flat, blade­like bristles, apices asymmetrically pointed; sternite 8 long, black setae apically.

Terminalia ( Figs. 134­138 View FIGURES 134­138 ): Large, as long as segments 5­8. Ventral lamella basally with dense brassy setae projecting from a deep cavity. Epandrium with 3 long branches; median branch prominent, gradually narrowed to preapex, slightly wider beyond; dorsal and ventral branch shorter than median branch. Gonostylus bifid apically. Hypandrium apically with numerous flat bristles.

Female. Unknown.

SPECIMENS EXAMINED. Holotype ♂, DEMOCRATIC REPUBLIC OF CONGO: Coll. Mus. Congo / Urundi : t. Bururi 900 m / Nyamurembe 7­iii­1953 / P. Basilewsky ( MRAC). Paratype: 1 ♂, Belg. Congo / 8 mi SW of / Pweto 1080 m. / 15.i.1958 / E. S. Ross and / R. H. Leech ( CASC) .

Distribution. This forest species has been captured from 900 to 1080 meters at elevations from January to March in southeast Democratic Republic of Congo.

Etymology. Latin grossus , for large, referring to the large terminalia.

Remarks. In addition to the characters in the key, the long, shaggy setae of the legs, ventral concavity of the middle femur, fringe of yellow setae along the margin of tergites 5­6, and the large terminalia ( Figs. 134­138 View FIGURES 134­138 ) characterize O. grossus .

MRAC

Musée Royal de l’Afrique Centrale

R

Departamento de Geologia, Universidad de Chile

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Asilidae

Genus

Ommatius

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