Dasyhelea tehuelche Díaz and Spinelli, 2014

Díaz, Florentina, Spinelli, Gustavo R., Donato, Mariano & Ronderos, María M., 2014, A taxonomic revision of the Patagonian species of the Dasyhelea mutabilis species group with a phylogenetic analysis of New World species (Diptera: Ceratopogonidae), Journal of Natural History (J. Nat. Hist.) 48 (35 - 36), pp. 2117-2175 : 2160-2164

publication ID	https://doi.org/ 10.1080/00222933.2014.909062
publication LSID	lsid:zoobank.org:pub:39D6AE31-36D1-4CBF-8C43-40050801ECAD
persistent identifier	https://treatment.plazi.org/id/069CC706-C6BF-4331-8858-566AB1BA5857
taxon LSID	lsid:zoobank.org:act:069CC706-C6BF-4331-8858-566AB1BA5857
treatment provided by	Felipe
scientific name	Dasyhelea tehuelche Díaz and Spinelli
status	sp. nov.

Treatment

Dasyhelea tehuelche Díaz and Spinelli sp. nov.

( Figures 16 View Figure 16 , 19G,H View Figure 19 , 20 View Figure 20 )

Diagnosis

Only species of Dasyhelea in Patagonia with the following combination of characters: male with posterolateral arms of aedeagus divided and posteromedian projection triangular with bifid, ventrally recurved tip. Female with subgenital plate semicircular with broad lumen, posteromedian projection absent; legs with coxae, trochanters and femora dark brown, tibiae pale brown and tarsomeres 1–4 whitish; PR 2.80–3.60.

Description of male. Similar to female with usual sexual differences. Antennal flagellum as in Figure 16A View Figure 16 . Palpus ( Figure 16B View Figure 16 ) pale brown; segment 3 bearing scattered sensilla on mesobasal surface; PR 3.75 (n = 3). Scutellum with 5–6 large setae, one thinner seta. Wing ( Figure 19H View Figure 19 ) length 0.66–0.75 (0.70, n = 3) mm, width 0.21–0.27 (0.24, n = 3) mm; CR 0.39–0.44 (0.42, n = 3). Genitalia ( Figure 16C View Figure 16 ): tergite 9 rounded distally, extending just below level of apex of gonocoxites, apicolateral process stout, distal portion moderately elongate with large apical seta; cercus small with 3–4 thin setae; sternite 9 ( Figure 16D View Figure 16 ) 0.3 length of greatest width, posteromedian projection absent, posterior margin truncate. Gonocoxite stout, 2 × longer than greatest width; gonostylus 0.8 length of gonocoxite, proximal one-third moderately broad, tapering slightly distally to blunt rounded tip. Paramere and gonocoxal apodemes ( Figure 16E View Figure 16 ) forming an asymmetrical structure; gonocoxal apodemes stout with broad, short, subbasal tooth; right apodeme broadly fused with left apodeme barely contacting paramere; paramere moderately short, bent at base, reaching one-half of aedeagus length, apex slender, tip pointed. Aedeagus 0.8 length of greatest width; W/L ratio 1.33–1.42 (1.39, n = 3); anterior margin straight, heavily sclerotized; basal arms stout, slightly recurved, directed posteriorly; posterolateral arms divided, inner portion moderately long, apical one-third recurved anteroventrally; posteromedian projection triangular with bifid, ventrally recurved tip.

Description of female. Head dark brown. Eyes contiguous for distance of width of 2 ommatidia. Antennal flagellum ( Figure 16F View Figure 16 ) pale; AR 0.91–0.93 (0.92, n = 2). Clypeus ( Figure 16G View Figure 16 ) with 4 pairs of setae. Palpus ( Figure 16H View Figure 16 ) pale brown; segment 3 with 1–2 subbasomesal capitate sensilla; PR 2.80–3.60 (3.20, n = 2).

Thorax. Scutum dark brown; scutellum pale brown with 6 large, 1–2 thinner setae. Legs with coxae, trochanters, femora dark brown, tibiae pale brown, tarsomeres 1–4 whitish, tarsomeres 5 infuscated; apex of hind tibia with 6 spines; foreleg TR 1.90–1.91 (1.90, n = 2), midleg TR 1.85–1.88 (1.86, n = 2), hind leg TR 1.92–1.93 (1.92, n = 2). Wing ( Figure 19G View Figure 19 ) length 0.63–0.69 (0.66, n = 2) mm, width 0.27–0.30 (0.28, n = 2) mm; CR 0.39–0.42 (0.40, n = 2); membrane slightly infuscated, densely covered with macrotrichia; second radial with narrow lumen; cubital fork at level of anterior portion of second radial cell. Haltere pale brown, knob base whitish.

Abdomen. Pale brown. Subgenital plate ( Figure 16I View Figure 16 ) semicircular, with large broad lumen, without posteromedian projection; posterolateral arms slender, deeply angulate, recurved 90°. Spermatheca ( Figure 16J View Figure 16 ) spherical heavily sclerotized, diameter 60 µm, neck short, straight, slightly tapered, measuring 12 µm.

Distribution ( Figure 20 View Figure 20 )

Argentina (Río Negro, Santa Cruz), Chile (Malleco).

Type material

Holotype male, allotype female, Argentina, Santa Cruz prov., lago del Desierto , 9 December 1996, G. Spinelli, sweep net ( MLPA) . Paratypes, 2 males, 1 female, as follows: same data as holotype 1 male ( MLPA). Río Negro prov., Parque Nacional Nahuel Huapi, La Cantera, 41°21′16″ S, 71°42′27.3″ W, 764 m, 11/ 30 December 2007, Garré-Montes de Oca GoogleMaps , 1 female, Malaise trap ( MLPA). Chile, Malleco prov., Parque Nacional Nahuelbuta , 26 December 1984, J. A. Downes , 1 male, sweep net ( JAD 1682 /2) ( CNCI) .

Etymology

The species is named after the Tehuelche Indians, early inhabitants of Santa Cruz province, Argentina.

Phylogenetic relationships

Dasyhelea tehuelche is closely related to the clade ( Dasyhelea yamana ( D. serrana ( D. pseudolacustris ( D. andensis , D. carlae , D. lacustris , D. macfiei )))). This clade is supported by the synapomorphy: “W/L ratio” [character 9].