Amphineurus (Rhamphoneurus) insanus Alexander, 1952

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

3.3.15. Amphineurus (Rhamphoneurus) insanus Alexander, 1952

Amphineurus (Rhamphoneurus) insanus Alexander, 1952: 111 (description, fig. 9: male terminalia).

Material examined.

Holotype: ♂, Chile , Malleco, Rio Blanco [38°23′S 71°48′W], 5/ 27-III-1951, Peña , Holotype 9362 (USNM) [part of specimen pinned and part on slide prepared by C.P. Alexander]. - Additional material: CHILE. 3 [sex unknown], Llanquihue , Carelmapu [41°44′S 73°40′W], Coast North of Canal de Chacao , 18-III-1957, Peña (USNM); 2 [sex unknown], Chiloé Is., Chaiten [42°58′S 72°32′W], 5/ 8-II-1954, Peña (USNM); 1 [sex unknown], Chiloé Is., Chepu [42°2′S 74°1′W], 10/ 14-II-1952, Peña (USNM); 1 ♂, Llanquihue, Carelmapu [41°44′S 73°40′W], Coast North of Canal de Chacao, 18-III-1957, Peña (USNM)*; 1 ♂, Chiloé Is., Aulen [42°2′S 74°1′W], 8-II-1952, Peña (USNM) *.

Diagnosis.

This species is distinguished by only a dark spot near R2 and a curved m-cu. Furthermore, this species has a remarkable thorax which is as long as tall and characteristic male terminalia with the sheath of aedeagus with a rectangular spur and the tip of left mesal lobe curved.

Redescription.

Wing length 6.75 mm, width 2.04 mm. - Coloration: General coloration brown. Rostrum and palpus brown. First segment of antenna yellow, remaining segments dark yellow. Head brown. Eyes black. Thorax brown, pleura yellowish brown. Scutum with one black stripe. Halter pale with knob ochreous. Coxae and legs yellowish-brown. - Head (dorsal view Fig. 20A ): Rostrum bifurcated with short appendices; first palpal segment slightly shorter than terminal segment; scape thinner than pedicel, terminal flagellomere longer than penultimate. Thorax (lateral view Fig. 20D , dorsal view Fig. 20E ): Thorax wider than long, with compressed aspect, with larger membranous area. Anepisternum and anepimerum short; prothorax wide. Anatergite as tall as katatergite. Halter with dilated knob. Wing (Fig. 20C ) almost clear of markings, except for strong marking covering R2; veins near bM fork faded (Fig. 20D ); M1+2 shorter than basal deflection of M1; r-m at least 1.25 × longer than combined length of M1+2 and basal deflection of M1; R2+3 longer than R2+3+4. - Male terminalia (Fig. 20F ): Male tergite IX faintly darkened on posterior margin, with wide V-shaped median notch; posterolateral lobes nearly triangular. Dorsal branch of gonocoxite poorly developed. Lobe of gonostylus with round-shaped lobule, longer than wide; lobule longer than half-length of lobe of gonostylus, as wide as stem. Clasper of gonostylus with differently shaped branches: lateral branch straight; medial branch ovoid. Mesal lobes of gonocoxite asymmetrical; left mesal lobe elongated, curved; right mesal lobe with sharp turn. Sheath of aedeagus straight, darkened on distal portion, narrowed at tip with preapical, nearly rectangular extension.

Remarks.

This species resembles A. (R.) alexanderi sp. nov. but differs mainly in attachment of m-cu, length of r-m, shape of thorax, mesal lobe and sheath of aedeagus.

Figures

Figure 20. Amphineurus (Rhamphoneurus) insanus 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.