Amphineurus (Rhamphoneurus) apiculatus Alexander, 1968

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

3.3.5. Amphineurus (Rhamphoneurus) apiculatus Alexander, 1968

Amphineurus (Rhamphoneurus) apiculatus Alexander, 1968: 29 (description, fig. 15: male terminalia).

Material examined.

Holotype: ♂, Chile, Chaihuin [39°56′S 73°34′W], 810 m, 20-III-1955, Peña , Holotype 12206 (USNM) [part of specimen pinned and part on slide prepared by C.P. Alexander].

Diagnosis.

This species is distinguished by having vein bM forking into M2+3+4 and M1, absence of markings on R2 and insertion of r-m desclerotized. Furthermore, the species has distinctive male terminalia with a curved sheath of aedeagus and both mesal lobes similar in length with vertically directed tiny tips.

Redescription.

Wing length 6.26 mm, width 1.82 mm. - Coloration: General coloration yellowish brown. Rostrum and palpus brown. First segment of antenna yellow, remainder segments brown. Head brownish gray. Eyes black. Thorax yellowish-brown, pleura brown. Scutum without stripes. Halter yellow. Coxae light yellow and legs dark yellow. Abdomen yellowish-brown. - Head (Fig. 12A ): Rostrum bifurcated with short appendices; first palpal segment shorter than terminal segment; scape as thick as pedicel; terminal flagellomere longer than penultimate. - Thorax (lateral view Fig. 12D , dorsal view Fig. 12E ): Thorax with several long setae. Anatergite shorter than katatergite. Halter with very dilated knob. Wing (Fig. 12C ) without distinct markings; veins near fork of bM (Fig. 12B ); R2 partially faded; bM forking into M1 and M2+3+4; R2+3 longer than R2+3+4. - Male terminalia (Fig. 12F ): Male tergite IX darkened on posterior margin, with wide V-shaped median notch; posterolateral lobes obtuse. Ventral branch of gonocoxite wide. Dorsal branch of gonocoxite half-length of ventral branch. Lobe of gonostylus with rounded lobule; lobule longer than wide, longer than half length of lobe of gonostylus, wider than stem. Clasper of gonostylus with similarly shaped branches: lateral branch rounded; medial branch curved. Mesal lobes of gonocoxite asymmetrical both similarly shaped, with pointed tip; right mesal lobe longer and narrower. Sheath of aedeagus elongated, curved, darkened only at tip.

Remarks.

This species resembles A. (R.) nonnullus Alexander but differs mainly in the fork of bM, shape of male tergite IX, clasper of gonostylus and mesal lobe.

Figures

Figure 12. Amphineurus (Rhamphoneurus) apiculatus Alexander. A head (dorsal view); B detail of wing; C wing; D thorax (lateral view); E thorax (dorsal view); F male tergite IX (dorsal view) and remainder of male terminalia (lateral view). - 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.