Arganthomyza acuticuspis Roháček & Barber, 2013

Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), Acta Entomologica Musei Nationalis Pragae (suppl.) 56, pp. 1-412 : 79-83

publication ID

https://doi.org/ 10.5281/zenodo.4272829

publication LSID

urn:lsid:zoobank.org:pub:E95E58A5-E0F1-4237-9D7C-4A81BB3120DD

DOI

https://doi.org/10.5281/zenodo.4339722

persistent identifier

https://treatment.plazi.org/id/03FB87A9-FFB5-FFD3-FE9E-6B50FE4CFD35

treatment provided by

Felipe

scientific name

Arganthomyza acuticuspis Roháček & Barber, 2013
status

 

Arganthomyza acuticuspis Roháček & Barber, 2013

( Figs 106 View Figs 106–109 , 110–125 View Figs 110–116 View Figs 117–124 View Figs 125–127 )

Arganthomyza acuticuspis Roháček & Barber, 2013: 18 View Cited Treatment .

Type material. HOLOTYPE: ♂, “ USA:NM: Torrance Co., Manzano Mts , 12 mi W Manzano [34°37.4'N 106°24.8'W], Red Canyon Cmpgd, 8000', 27–30.viii.1993, J. E. O’Hara, malaise trap ” and “ HOLOTYPUS ♂, Arganthomyza acuticuspis sp.n., J. Roháček & K. N. Barber det. 2011” [red label] ( CNCI, intact, see Fig. 106 View Figs 106–109 ) GoogleMaps . PARATYPES: 2 ♂♂ 9 ♀♀ ( AMNH, CASC, CNCI, DEBU, LEMQ, OSAC, UCRC, WFBM) (details in ROHÁĆEK & BARBER 2013).

Diagnosis. Male 2.24–2.78 mm, female 2.30–3.05 mm. Mostly blackish brown ( Fig. 106 View Figs 106–109 ), sparsely grey microtomentose and distinctly shining; face, parafacialia, gena, postgena, ventral margin of occiput, mouthparts, haltere entirely and frons, antennae, legs largely contrasting ochreous, yellow or whitish yellow. Frontal triangle relatively short and narrow, reaching anterior third (its brown part only half) of frons. Mid and hind basitarsus without short thickened setae. T1 and T2 almost separate, only laterally partly fused. T3–T5 subequal, broad, bent onto ventral side of abdomen. Wing hyaline ( Fig. 125 View Figs 125–127 ). Reference to the genitalia is necessary to conndently distinguish this species from A. disjuncta and A. socculata , although colour characters can differentiate taxa in its own species group.

Male genitalia (see Figs 110–116 View Figs 110–116 for details). Epandrium ( Figs 110, 111 View Figs 110–116 ) brown to blackish brown, higher than long and relatively broad. Gonostylus ( Figs 111, 116 View Figs 110–116 ) nat, ochreous yellow, of elongate subtriangular lateral outline (in maxium extension view) with acute apex; very slightly bent medially ( Fig. 110 View Figs 110–116 ), markedly less than in A. bivittata and A. duplex . Postgonite narrow, long, with apex bent posteriorly ( Fig. 112 View Figs 110–116 ); nlum of distiphallus with longitudinal sclerites only partly fused and basally dilated ( Fig. 115 View Figs 110–116 ).

Female postabdomen and genitalia (see Figs 117–124 View Figs 117–124 for details). T7 and S7 completely fused into largely dark brown ring-shaped tergosternum T7+S7 ( Figs 118, 119 View Figs 117–124 ), anteroventrally with long, dark, nnely sinuate transverse ledge-like band and spiracles situated at its lateral ends ( Fig. 119 View Figs 117–124 ). Ventral receptacle ( Fig. 121 View Figs 117–124 ) slender and elongate, of the same general form as in A. bivittata and A. duplex , with middle part curved and somewhat ringed, and long terminal part simply tubular and apex vermicularly twisted. Spermathecae (1+1) short-pyriform to subcylindrical ( Figs 117, 120 View Figs 117–124 ), both of the same size, each more or less constricted in proximal third, with dark transversely striated (striae interrupted) surface in distal two-thirds, and with a number of small dark spines in narrower basal part around duct insertion; duct with cervix distinct but weakly sclerotized.

Discussion. Arganthomyza acuticuspis is supported as basal in the A. duplex group, which also includes A. bivittata and A. duplex ( ROHÁĆEK & BARBER 2013: Fig. 173 View Figs 168–175 ; ROHÁĆEK & TÓTHOVÁ 2014: Fig. 1 View Fig ).

Arganthomyza acuticuspis differs distinctly from both of its closest relatives by its uniformly dark brown pleuron, among many other internal characteristics. However, it is more similar externally to both A. disjuncta and A. socculata . The key above is necessary for absolute separation of these three species but because A. acuticuspis appears to be restricted to the southwestern United States (Arizona, New Mexico), it is distantly allopatric with the northwestern A. socculata (Alaska) , and these two species should not be confused. In contrast, the female of A. acuticuspis can be readily distinguished from that of A. disjuncta which has the S7 separated from T7 (fused in A. acuticuspis ) while the shape of the gonostylus is usually enough to separate the males of these two (narrowly sympatric?) species.

Biology. Virtually nothing is known about the biology of this species. Generally, habitats are open meadows dominated by grasses and wildnowers bordering and surrounded by coniferous forests (based on photographic information from Dr. James O’Hara, CNCI). This generalized habitat is more reminiscent of the open “grassy” habitat of A. disjuncta than of other members of the A. duplex group that are associated with a more mesic mixed forest with dense herbaceous undergrowth (at least in eastern North America). Flight period runs minimally from 15 June (Arizona: Rustler Park) to 27–30 August (New Mexico: 12 mi W Manzano) but this short period is probably an artifact of insufncient data.

Distribution. This poorly collected species is known only from elevated sites (7100' to 8950' = 2164 to 2728 m) in Arizona and New Mexico in the southwestern United States of America (see Table 2, Fig. 600 View Fig ).

CNCI

Canadian National Collection Insects

AMNH

American Museum of Natural History

DEBU

Ontario Insect Collection, University of Guelph

LEMQ

McGill University, Lyman Entomological Museum

OSAC

Oregon State Arthropod Collection

UCRC

University of California, Riverside

WFBM

W.F. Barr Entomological Collection

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Anthomyzidae

Genus

Arganthomyza

Loc

Arganthomyza acuticuspis Roháček & Barber, 2013

Roháćek, Jindřich & Barber, Kevin N. 2016
2016
Loc

Arganthomyza acuticuspis Roháček & Barber, 2013: 18

ROHACEK J. & BARBER K. N. 2013: 18
2013
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