Curtonotum notatum Lindsay, 2019

Lindsay, Kate G., Klymko, John & Marshall, Stephen A., 2019, Revision of the Central American and Mexican species of the Curtonotum murinum species complex (Diptera: Curtonotidae), Zootaxa 4651 (3), pp. 531-554 : 551-554

Curtonotum notatum Lindsay , sp. nov.

Figures 47–51

Differential diagnosis. Distinguished from congeners by the heavily marked abdomen and high ventral branch count on the antennal arista (9–13). The distal leaf-like lobe of the distiphallus is symmetrical and 3/4 sclerotized from the left side and with microtrichia on each side. The upper projection is slightly reflexed and wider apically, the lower projection is strongly sclerotized and reflexed ( Fig. 50 ). Curtonotum notatum sp nov. also has a very shallow gena (1/6 to 1/4 the width of the postpedicel). Females are here treated as indistinguishable.

Description. Male: Overall length (excluding wings): 5–7.2 mm.

Head: Vibrissa subequal to subvibrissal setae. Parafacial thin, gena approximately 1/6 to 1/4 width of postpedi- cel. Postpedicel 1.5–2 times as long as pedicel. Arista with 9–14 dorsal branches, 4–6 ventral branches.

Thorax: Scutum often with distinct grey dorsal markings. Postpronotal lobe with 3 setae, 1 long, 2 shorter sub- equal and sometimes several poorly defined setulae ventrally. Line of setulae above fore coxa black.

Legs: Legs orange or beige. Hind femur with wide dark preapical band.

Wing: Membrane light grey-brown, with indistinct infuscation around crossvein dm–m and at anterior margin.

Abdomen: Tergite 2 with 2 posterodorsal triangles, sometimes covering almost entire to entire tergal length. Tergites 3–5 with thick median vitta and distinct lateral triangles. Band on posterior margins of tergites 3–5 adjoin- ing medial and lateral markings covering 1/2 to 3/4 of tergite 3.

Male terminalia: Cercus elongate, same length as epandrium at widest point. Surstylus thin and elongate, divided into 2 lobes, inner lobe dark brown, 1/2 width as outer lobe. Structure of postgonite, hypandrium and phallapodeme unknown. Distiphallus with distal leaf-like lobe recurved at apex, 3/4 sclerotized from left side, with microtrichia on both margins. Upper process thin and wider at tip, lower process short, sclerotized and reflexed.

Female: Unknown.

Etymology. From the Latin, notata, meaning “marked”, referring to the darkly marked abdomen.

Comments. Four females matching the general external diagnosis of C. notatum sp. nov. from Costa Rica were dissected, but no distinct terminalia characters could be identified to diagnose females of the species. No males of C. notatum were dissected due to the lack of available non-type specimens.

Type Material. Holotype: ♂: MEXICO. Tabasco: Teapa , [17°37’11.03”N, 92°58’22.588”W] I., “36”, H. H.S. ( CMNH) . Paratypes: COSTA RICA. Alajuela: ♂, San Carlos, P.N. Arenal, sendero Pilon , 600 m, 22.II.2001, J.D. Gutierrez, L_N_457900_269100#61848 ( MNCR) . MEXICO. Veracruz: ♂, Ocotal Chico , 600 m, 4–5.V.1985, W.N. Mathis ( USNM) .

Other material examined. COSTA RICA. Limon: ♀, R.B. Hitoy–Cerere, Estacion Hitoy–Cerere , 100 m, 24.VI – 8.VII.2003, E. Rojas, B. Gamboa, W. Arana, L_N_184120_643471#74239 ; 2♀, Amubri , 70 m, 3–28.II.1995, G. Gallardo, L_S_385000_578100#4389 (all MNCR) . La Lola, ♀, VII–VIII.1956, W.B. Heed, H.L. Carson, M. Wasserman ( AMNH) . Cartago: ♀, RioTuis , 3000 m, 16–22.VII.1993, W.J. Hanson ( EMUS) .

Figures

FIGURES 47–51. Curtonotum notatum sp. nov.. 47. Habitus, lateral view ♂. 48. Head, anterior view. 49. Male terminalia, external left lateral view. 50. Detail of distiphallus, left lateral view. 51. Abdomen, dorsal view.