Amphineurus (Rhamphoneurus) nothofagetorum Alexander, 1929a

Santos, Daubian, Santos, Rodrigo dos Reis & Ribeiro, Guilherme Cunha, 2022, Systematics of Amphineurus (Rhamphoneurus Alexander) (Diptera: Tipuloidea: Limoniidae), Arthropod Systematics & amp; Phylogeny 80, pp. 439-494 : 439

3.3.18. Amphineurus (Rhamphoneurus) nothofagetorum Alexander, 1929a

Amphineurus (Rhamphoneurus) nothofagetorum Alexander, 1929a: 187 (description, fig. 90: wing, fig. 223: male terminalia).

Material examined.

Paratypes: 1 ♂, Argentina, Nahuel Huapi, Lago Correntoso [40°42′S 71°39′W], 2-XI-1926, R.C. Shannon (USNM)*; 1 ♂, Chile, Puerto Varas [41°19′S 72°59′W], 16-XII-1926, F. & M. Edwards (USNM)*. - Additional material: CHILE. 1 ♂, 1 ♀ and 2 [sex unknown], Arauco, Nahuelbuta [37°46′S 72°59′W], 5/ 10-II-1953, Peña (USNM)*; 2 [sex unknown], Cautin, Villarica [39°27′S 71°54′W], 30 Km. NE, 1/ 30-I-1965, Peña (USNM) *; 2 ♂ and 1 [sex unknown], Chiloé Is. Ancud [41°52′S 73°48′W], 23-I-1952, L.P. Guzman (USNM)*; 1 ♀ and 1 [sex unknown], Chiloé Is., Chaiten [42°58′S 72°32′W], 5/ 8-II-1954, Peña (USNM)*; 1 [sex unknown], Arauco, Nahuelbuta, Butamalal [37°49′S 73°14′W], 1100-1400 m, 23/ 31-I-1954, Peña (USNM)*; 1 [sex unknown], Cordillera las Raices [38°31′S 71°28′W], West of Lonquimay , 1500 m, 28-XII-1967, Peña (USNM) *; 2 ♂, Chiloé Is. Ancud [41°52′S 73°48′W], 23-I-1952, Peña (USNM); 2 ♂, Casa Pangue [41°03′S 71°51′W], 6/ 10-XII-1926, F. & M. Edwards (USNM); 2 ♂, Cautin, Villarica [39°27′S 71°54′W], 30 Km. NE, 1/ 30-I-1965, Peña (USNM); 1 ♂, Chiloé Is., Chaiten [42°58′S 72°32′W], 5/ 8-II-1954, Peña (USNM); 1 ♂, Llanquihue, Hornohuinca [41°25′S 72°37′W], South of Volcan Calbuco , III-1968, Peña (USNM) ; 1 ♂, Chiloé Is., Chepu [42°2′S 74°1′W], 4/ 6-IV-1968, Peña (USNM); 1 ♂, Osorno, Pucotrihue [40°32′S 73°42′W], 60 m, 1/ 13-III-1955, Peña (USNM); 1 ♂, Caramavida [37°40′S 73°20′W], 1000 m, 5/ 10-II-1953, Peña (USNM); 1 ♂, Cordillera las Raices [38°31′S 71°28′W], West of Lonquimay , 1500 m, 28-XII-1967, Peña (USNM) .

Diagnosis.

The species is distinguished by the darkened distal quarter of the wings and M1+2 longer than half the length of the basal deflection of M1. Furthermore, the species has a distinctive clasper of gonostylus with setae on medial branch and straightened lateral branch.

Redescription.

Wing length 6.10 mm, width 1.92 mm. - Coloration: General coloration brown. Rostrum and palpus dark brown. First segments of antenna brownish yellow, remaining segments brown. Head dark brown. Eyes black. Thorax reddish-brown, pleura brown. Three brown stripes on scutum. Halter yellowish brown. Coxae and legs brownish yellow. Abdomen brown. - Head (ventral view Fig. 23A , dorsal view Fig. 23B ): Rostrum bifurcated with short appendices; first palpal segment shorter than terminal segment; scape narrower than pedicel, terminal flagellomere as long as penultimate; antenna with several long setae. - Thorax (lateral view Fig. 23E , dorsal view Fig. 23F ): Anatergite as tall as katatergite. Halter with dilated knob. Wing (Fig. 23D ) with several markings, including faint markings on A1 and beginning of Rs; markings highlighting m-cu and R2+3+4; stronger markings on R2 and near tip of R1; distal quarter of wing darkened; veins near fork of bM (Fig. 23C ) faded; M1+2 longer in length than half-length of basal deflection of M1; R2+3+4 about same length as R2+3. - Female terminalia (Fig. 23H ): Female tergite IX longer and wider than tergite X. Hypogynial valve slender, longer than cercus. Cercus strongly curved dorsad. - Male terminalia (Fig. 23G ): Male tergite IX unpigmented, with shallow curved median U-shaped notch. Dorsal branch of gonocoxite long, ca. 0.75 times length of ventral branch. Lobe of gonostylus with rounded lobule, lobule as long as wide, shorter than half-length of lobe of gonostylus, narrower than stem. Clasper of gonostylus with differently shaped branches; lateral branch straight, medial branch curved, club-shaped, with concentration of setae. Mesal lobes of gonocoxite asymmetrical, both with posterior margin rounded with bump on side; right mesal lobe wider. Sheath of aedeagus angulated, darkened through half its length.

Remarks.

We could not observe the holotype, but the paratypes were examined. This species resembles A. (R.) deceptus sp. nov. but differs mainly in shape of branches of the clasper, male tergite IX, mesal lobes and the sheath of the aedeagus.

Figures

Figure 23. Amphineurus (Rhamphoneurus) nothofagetorum Alexander. A head (ventral view); B head (dorsal view); C detail of wing; D wing; E thorax (lateral view); F thorax (dorsal view); G male tergite IX (dorsal view) and remainder of male terminalia (lateral view); H female terminalia (dorsal view). - Abbreviations: aed sh, sheath of aedeagus; anatg, anatergite; anepm, anepimeron; anepst, anepisternum; aprn, anteropronotum; cer, cercus; cgonst, clasper of gonostylus; cx, coxa; goncx, gonocoxite; hlt, halter; hyp val, hypogynial valve; k, knob of halter; kepm, katepimeron; kepst, katepisternum; ktg, katatergite; l ms, left mesal lobe of gonocoxite; lgonst; lobe of gonostylus; mr, meron; mtanepst, metanepisternum; mtepm, metepimeron; mtg, mediotergite; mtkepst, metakatepisternum; mtn, metanotum; p, posterior basalare; patg, paratergite; pprn, postpronotum; presct, prescutum; r ms, right mesal lobe of gonocoxite; sct, scutum; sctl, scutellum; st, sternite; tg, tergite; t 9, male tergite IX.