Curtonotum transitus Lindsay

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: 550

publication ID

https://doi.org/10.11646/zootaxa.4651.3.7

publication LSID

lsid:zoobank.org:pub:4F0F61FD-8DC0-4FD3-B28D-2FD697F75B6D

DOI

http://doi.org/10.5281/zenodo.5695723

persistent identifier

http://treatment.plazi.org/id/03D387DB-FFC9-FFB4-FF44-83BCFE7695A4

treatment provided by

Plazi

scientific name

Curtonotum transitus Lindsay
status

sp. nov.

Curtonotum transitus Lindsay   , sp. nov.

Figures 40–46 View FIGURES 40–42 View FIGURES 43–46

Differential diagnosis. Distinguished from its congeners by the inner lobe of the surstylus which is 7–8 times as long as wide and wedge shaped and the distiphallus, which has a distal leaf-like lobe that is elongate, sclerotized and folded on the left side with microtrichia on either side. The upper projection is curled, thin and tapered and the lower projection is membranous and folded ( Fig. 46 View FIGURES 43–46 ). Tergite 3 has a posterior band covering 1/10 to 1/8 of the tergal length ( Fig. 42 View FIGURES 40–42 ). Females are here treated as indistinguishable.

Description. Male: Overall length (excluding wings): 5.1–5.3 mm.

Head: Vibrissa subequal to subvibrissal setae. Parafacial thin, gena approximately 1/4 width of postpedicel. Postpedicel 1.5–2 times length of pedicel. Arista with 6–8 dorsal branches, 4–6 ventral branches. Thorax: Scutum with faint grey dorsal markings. Postpronotal lobe with 3 setae (1 long, 2 shorter subequal) and sometimes several thin, poorly defined setulae ventrally. Line of setulae above fore coxa black.

Legs: Orange to beige, hind femur with wide, dark brown preapical band.

Wing: Light grey-brown, with indistinct infuscation around crossvein dm–m and along anterior margin.

Abdomen: Tergite 2 with 2 posterolateral markings covering almost 1/3 of tergite. Tergites 3–5 with dark median vitta and thin, mottled, lateral triangles. Band on posterior margin of tergites 3–5 adjoining the medial and lateral markings very thin, covering approximately 1/10 to 1/8 length of tergite 3.

Male terminalia: Cercus somewhat elongate, same length as epandrium at widest point. Surstylus thin and straight, modified into 2 lobes, inner lobe same length as cercus and black, wider proximally, 7–8 times as long as wide. Outer lobe 2 times width of inner lobe. Postgonite harpoon shaped. Hypandrium with blunt dorsobasal projection. Phallapodeme thin, shorter than epandrium. Distiphallus with elongate distal leaf-like lobe slightly folded inwards on left with microtrichia on both edges and sclerotization on left side. Upper projection strongly recurved lower projection folded and membranous.

Female: Unknown.

Etymology. From the Latin, transitus   , meaning “transition”, which refers to the notion that this species shares a combination of morphological traits with two other species in the C. murinum   species complex ( C. irksum   sp. nov. and C. prolixum   sp. nov.).

Comment. Three females matching the general external diagnosis of C. transitus   sp. nov. from Mexico were dissected, but no distinct terminalia characters could be identified to diagnose females of the species.

Type material. Holotype and one paratype: ♂: MEXICO. Saint Luis Potosi: El Salto, El Naranjo, [22°27’3.286”N, 99°20’24.506”W], 29.VI.1965, P.J. Spangler GoogleMaps   . Other paratype: BELIZE. Stann Creek District: ♂, Cockscomb Basin Wildlife Sanctuary , 16°47’N, 88°30’W, 5–6.IV.1993, W.N. Mathis (all USNM). GoogleMaps  

Other material examined. COSTA RICA. Guanacaste: # F, R.V.S. Bosque Diria, Estacion Diria, 100–200 m, 9.II.2003, W. Porras, L_N_239550_361650#72366; #M, Santa Cruz, Camino a la Esperanza, 420 m. 21.V.2001, B. Hernandez, L_N_238450_363050#54073; Limon: ♀, R.V.S. Gandoca-Manzanillo, Punat Mona, 0–3 m, 6.XI.2001, B. Hernandez, L_S_395700_614500#69061 ( MNCR)   . MEXICO. Jalisco: ♀, Chamela , 26-30.IX.1985, F.D. Parker, T.L. Griswold; ♀, Chamela, 1-8.X.1985, F.D. Parker, T.L. Griswold. Guerrero: ♀, Zihuatanejo, 12.XII.1966, G.E. Bohart ( UTAH)   . COSTA RICA

USNM

Smithsonian Institution, National Museum of Natural History

MNCR

Museo Nacional de Costa Rica

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Curtonotidae

Genus

Curtonotum