Coenosia tarsata (Snyder, 1957)

Patitucci, Luciano Damian, Mulieri, Pablo Ricardo, Couri, Marcia Souto & Dominguez, Martha Cecilia, 2023, Phylogeny of the old and fragmented genus Austrocoenosia Malloch reveals new evidences on the morphology and evolution of the genera Coenosia Meigen and Neodexiopsis Malloch (Diptera: Muscidae), Arthropod Systematics & amp; Phylogeny 81, pp. 611-653 : 611

Coenosia tarsata (Snyder, 1957)

Male (Fig. 10A).

Length. Body: 3.6-4.75 mm, wing: 2.4-3.0 mm. Head (Fig. 10B ): Frons at vertex about more than one third of the head width. Frons, fronto-orbital plate, parafacial and gena black with yellow-grey pollinosity. Fronto-orbital plate with 1-3 little setulae, close to parafacialia. Antenna dark-brown, apex of pedicelo yellowish, apical angle of postpedicel acute; arista brown with its longest microtrichia shorter than its basal diameter. Palpus black. Thorax: (Fig. 10C ). Black with brownish-gray. Chaetotaxy: acrostichals with irregular length and biseriate, anterior presutural acr s shorter than the eaDC; dorsocentrals 1+3, eaDC is less than one third of the aDC. Anepisternum with a series of 3-4 strong setae; katepisternum with 3-4 setula. Wing: Both calypters hyaline with yellow margins. Legs: Coxae black with grey pollinosity; trochanters yellow; femora black with grey pollinosity; apex of femora, tibiae, and 1-4 tarsomeres yellow. Fifth tarsomere black (Fig. 10A ). Fore femur with a row of dorsal, posterior, and ventral setae; first tarsomere with a strong ventral seta. Mid femur with 5-6 setae on anterior surface, 2-3 av setae on basal third, and 3-5 pv setae on basal half; mid tibia with one ad and one pd median, ad seta shorter and positioned below of the pd seta. Hind femur with 3 setae on anterior surface, a row of pv setae on basal third, and a row of 5 av setae distanced from each other; hind tibia with 3 preapical setae (ad, dorsal, ventral). Abdomen: Grey without spots. Sternite 5 with apical margin concave with a thin “U” shape and with membrane; setae presented throughout the plate (Fig. 10E ). Terminalia: Cercus with strong spines on apical middle (Fig. 10F-J ).

Female (Fig. 11A, B).

Length. Body: 4.3-50 mm, wing: 4.1-4.6 mm. Differs from male as follows: Head: Frons with golden pollinosity. Ovipositor: Segments longer than wide. Tergites 7 and 8 with two long and wide sclerotized plates (Fig. 11C ). Sternites 6 and 7 with one short and thin plate; sternite 8 divided into two small and sclerotized plates each with 4-5 setae on distal margin (Fig. 11D ). Three spermathecae, oval shaped (Fig. 11E ).

Type material.

Holotype. Male; IFML [pinned, both in good condition]. Paratype. Female [pinned, both in good condition]. See Patitucci et al. (2011) for original labels.

Additional material examined.

ARGENTINA - Neuquén province • 2 females, 1 male; Primeros Pinos, Portezuelo La Atravezada ; -38.891693, -70.652192; 1876 m a.s.l.; 08 Feb 2018; Mulieri & Olea leg.; MACN .

Distribution (Fig. 12C).

ARGENTINA: Neuquén (new record), Santa Cruz.

Remarks.

Snyder (1957) described C. tarsata with one male and two female specimens from Santa Cruz province, Argentina. In his work (op. cit.), the author used the classification proposed by Huckett (1934a) and placed the species under the genus Limosia . Snyder (1957) found it difficult to use the generic diagnosis of Coenosia and Austrocoenosia proposed by Malloch (1934) for the species of Patagonia, because he could not establish the presence of the pd seta on the hind tibia. In Stein’ key (1911), C. tarsata comes close to Coenosia pilitibia Stein 1911, but differs in the chaetotaxy of the mid tibia. In Malloch’s key (1934), C. tarsata comes close to A. ignobilis (Stein, 1911), but the coloration of fore femur and the shape of the abdomen can separate both species.

Nomenclature note.

Huckett (1965) described a new species Coenosia (Limosia) tarsata with several female and male specimens from the Nearctic region. Since the specific epithet tarsata, had been previously used by Snyder (1957) for Limosia tarsata , Coenosia tarsata Huckett is a junior secondary homonomy. In some web sites (http://diptera.org/Nomenclator/Details/50641, https://fr.wikipedia.org/wiki/Coenosia), we found a new proposed name, Coenosia hucketti Pont, 1988, but found no publication establishing the replacement name (Adrian Pont per. commu.). So, here we formally propose the replacement name Coenosia hucketti Pont.

Diagnosis of the Coenosia argentifrons group.

The Coenosia argentifrons group is defined by the combination of the following characters: Black or grey species, with grey or brownish pollinosity [except head of males of C. argentifrons with silver pollinosity]; frons longer than wide [except C. argentifrons and C. nigerrima with similar length and width]; dorsocentrals 1+3, with an eaDC, that is usually less than one third or fifth of length of the aDC [except C. brevicornis with eaDC is half of length of aDC]; mid tibia with one ad and one pd median setae; hind femur with one preapical ad and one pd setae; hind tibia with one long ad seta and one fine av seta, a pd seta. Male terminalia can be characterized by cercus longer than broad with two longitudinal keels. Female spermathecae, with erythrocyte shape.

The Coenosia argentifrons group here proposed includes C. argentifrons , C. brevicornis , C. dubia , C. ignobilis , C. inusitata , C. nigerrima , C. patagonica sp. nov., and C. projecta . This group includes all the species originally assembled by Malloch (1934) under the genus Austrocoenosia (with the exception of C. aurifera ) and a new species. This group seems to be biogeographically circumscribed to the Andean chains, especially in to the Central Chilean and Subantarctic sub-regions of South America.

Descriptions.

To avoid lengthy and redundant descriptions, the characters listed below are present in all species of C. argentifrons -group. - Male. Head: Dichoptic; eyes bare. 1 pair of reclinate orbital setae. One vertical seta strong and longer than outer vertical setae. Ocellar setae strong and long. Occiput with three rows of setae: a posterior row at dorsal middle of head, a central row complete, and an anterior row at ventral middle of head. Gena with strong black setae. Palpus filiform, black or dark brown. Thorax: Chaetotaxy: intra-alars 1+2, posterior postsutural seta shorter; supra-alars 1+1; postpronotals 2; notopleurals 2. Prealar absent. Scutellum with one long basal and one long apical pair of setae, similar in size: katepisternals 1+1+1, forming an equilateral triangle; anepimeron, katepimeron, and meron bare; proepisternals 2; proepimeral 2, lower seta downcurved. Anepisternum with a series of 4-5 strong setae. Prosternum bare. Wing: Hyaline; veins bare, except costal vein; lower calypter glossiform, twice at longer than upper. Legs: Fore tibia with one median posterior seta. Hind femur with one preapical ad setae and one pd seta. Hind tibia with one long ad seta and one fine av setae, 3 preapical setae (ad, dorsal, ventral). Abdomen: Sternite 1 bare. Male. Sternite 5 with basal margin convex, and with two-pointed apical process. Terminalia: Cercus longer than broad, sclerotized, with hair-like setula, and two longitudinal keels. Aedeagus with phapod slightly curved, strongly sclerotized, and longer than hypd in lateral view; pregt kidney-shaped, ventrally fused with the hypd. - Female. Ovipositor: Segments longer than wide. Three spermathecae, “erythrocyte” shaped.

Figures

Figure 10. Coenosia tarsata, male. A Lateral view, B head, frontal view, C thorax, dorsal view, D abdomen, dorsal view, E fifth sternite, F cercus, dorsal view, G cercus, surstylus and phallic complex, lateral view, H detail of cercus and surstylus, distal tip, I phallic complex, lateral view, J detail of phallic complex, distal tip. Scale bar: 1 mm (A), 0.5 mm (B-D), 0.2 mm (E-G), 0.1 mm (H-J). Distiphallus, brush of fine hairs - red arrow.

Figure 11. Coenosia tarsata, female. A Lateral view, B head, frontal view, C ovipositor, dorsal view, D ovipositor, ventral view, E spermathecae. Scale bar: 1 mm (A), 0.2 mm (B), 0.5 mm (C-D), 0.1 mm (E). Sixth and seventh sternites - red arrows.