Amphineurus (Rhamphoneurus) amorimi, Santos & Santos & Ribeiro, 2022

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

3.3.2. Amphineurus (Rhamphoneurus) amorimi sp. nov.

Material examined.

Holotype: ♂, Chile, Chiloé Is., Dalcahue [42°22′S 73°39′W], 10/ 12-II-1954, Peña (USNM)*. Paratypes: 2 ♂, Chile, Chiloé Is., Chaiten [42°58′S 72°32′W], 5/ 8-II-1954, Peña (USNM)*; 1 ♂, Chile, Caramavida [37°40′S 73°20′W], 1000-1300 m, 1-I-1954, Peña (USNM)*. - Additional material: CHILE. 3 [sex unknown], Chiloé Is., Dalcahue [42°22′S 73°39′W], 10/ 12-II-1954, Peña (USNM); 1 [sex unknown], Chiloé Is., Chaiten [42°58′S 72°32′W], 5/ 8-II-1954, Peña (USNM) .

Etymology.

The species is named after Dalton de Souza Amorim, a remarkable Brazilian Diptera expert.

Diagnosis.

This species is distinguished by only a marking near R2 and R2+3+4 as long as R2+3. Furthermore, the species has characteristic male terminalia with a triangular spur and an atrophied tip of the left mesal lobe.

Description.

Wing length 5.60 mm, width 1.68 mm. - Coloration: General coloration dark brown. Thorax dark brown, pleura brown. Scutum without stripes. Halter dark brown with knob pale. Coxae light brown and legs brown. - Head (dorsal view Fig. 9B , ventral view Fig. 9A ): Rostrum bifurcated with long appendices; first palpal segment shorter than terminal segment; scape thinner than pedicel, terminal flagellomere longer than penultimate. - Thorax (lateral view Fig. 9E , dorsal view Fig. 9F ): Thorax with long setae, notably on coxae. Anatergite taller than katatergite. Halter with dilated knob. Wing (Fig. 9D ) almost clear of markings, except for strong marking covering R2; veins near fork of bM (Fig. 9C ) faded; M1+2 shorter than basal deflection of M1, R2+3+4 similar in length to R2+3. - Male terminalia (Fig. 9G ): Male tergite IX slightly darkened at posterior margin, with wide V-shaped median notch; posterolateral lobes nearly triangular. Ventral branch of gonocoxite slender. Dorsal branch of gonocoxite shorter than half length of ventral branch, setose on distal tip. Lobe of gonostylus with rounded lobule; lobule longer than wide, longer than half-length of lobe of gonostlyus, about as wide as stem. Clasper of gonostylus with differently shaped branches: lateral branch long and straight; medial branch curved, club-shaped. Mesal lobes of gonocoxite asymmetrical; left mesal lobe straight and narrow, with small bend at distal section; right mesal lobe curved, elongated. Sheath of aedeagus straight; apical half darkened, with short, curved triangular projection.

Remarks.

Specimens of this new species were previously identified by C.P. Alexander as A. (R.) insanus Alexander. This species resembles A. (R.) morphyi sp. nov. but differs mainly in the chaetotaxy of the thorax and gonocoxite, length of R2+3+4 and shape of the mesal lobe.

Figures

Figure 9. Amphineurus (Rhamphoneurus) amorimi sp. nov. 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). - Abbreviations: Abbreviations: aed sh, sheath of aedeagus; anatg, anatergite; anepm, anepimeron; anepst, anepisternum; aprn, anteropronotum; cgonst, clasper of gonostylus; cx, coxa; goncx, gonocoxite; hlt, halter; 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; t 9, male tergite IX.