Relictanum johnsoni Curran 1934, comb. nov.
Creators: name: Miranda, Gil Felipe Gonçalves
name: Marshall, Stephen A.
name: Skevington, Jeffrey H.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Relictanum
Relictanum johnsoni

description: Relictanum johnsoni (Curran, 1934) comb. nov.
Map 1. Figure 45 (a–e).
Baccha johnsoni Curran, 1934. Curran, 1934: 392. Type locality: Guyana, Bartica. Holotype female MCZ. Hull, 1949a: 159 (redescription), 252 (fig. 281, female abdomen).
Ocyptamus johnsoni. Thompson et al., 1976: 20 (catalog citation).
Baccha plutonia Hull, 1948. Hull, 1948: 2. Type locality: Peru, Lima, Iquitos. Holotype female USNM. Hull, 1949a: 166 (redescription), 194 (fig. 17, female abdomen). n. syn.
Ocyptamus plutonia. Thompson et al., 1976: 25 (catalog citation).
Baccha smarti Curran, 1939. Curran, 1939: 10. Type locality: Guyana, Mazaruni. Holotype female BMNH. n. syn.
Ocyptamus smarti. Thompson et al., 1976: 27 (catalog citation).
Baccha trinidadensis Curran, 1939. Curran, 1939: 11. Type locality: Trinidad, Tabaquite. Holotype female AMNH. Hull, 1949a: 212 (fig. 98, female abdomen), 254 (fig. 284, female wing). n. syn.
Ocyptamus trinidadensis. Thompson et al., 1976: 28 (catalog citation).
Male. Male unknown.
Female. Similar to R. crassum except: Face mostly black, pale reduced ventro-laterally. Frons white pollinose maculae not connected to face pollen. Vertex narrow; ocellar triangle ~2 times its length from posterior eye margin and ~1 ocellus-width from lateral eye margin. Wing hyaline but slightly dark on cells bc, c, sc, basal ⅓ of r1, r, bm and cu p. Protibia and mesotibia with basal ⅓ to ½ pale. Metatibia with basal ¼ pale, metabasitarsomere apical ¼ pale, 4th and 5th metatarsomeres slightly darker; metacoxa and metatrochanter pile entirely white. Fourth tergite sometimes sub-quadrate, slightly longer than wide. Fifth tergite sub-quadrate, slightly wider than long. Genitalia: 7th tergite rectangular, with very short baso-lateral extensions and middle slightly convex, with pile only on apical ½ and sparse to bare medially; 7th sternite absent. Eighth tergite slightly concave on posterior margin, baso-lateral corners acute and connected to 8th sternite; 8th sternite whole, with anterior notch. Tenth tergite modified and fused to cercus forming a pair of rectangular sclerites narrowly fused basally, with long narrow baso-lateral extensions, apical ½ slightly enlarged, sparse pilose on basal ¾, densely pilose and with setulae apically.
Length. 8–10.5mm; wing 6–7mm.
Distribution. Guyana, Ecuador (Napo), Peru (Cuzco, Huanuco, Lima), Trinidad.
Material examined. BOLIVIA. La Paz, Covendo, Mulford Bio Expl 1921–22, Sep, W.m. M. Mann (1 ♀, paratype Baccha plutonia, CNC Diptera 161378). GUYANA. Bartica, Type Baccha johnsoni No. Curran [red label], Collection C.W. Johnson, Type 7662 [red label], 30 Jun 1901 (1 ♀, holotype Baccha johnsoni, MCZ). ECUADOR. Napo, Coca, Napo R., 250m, 25–30 Apr 1965, L. Pena (1 ♀, CNC Diptera 161206); ..., Jatun Sacha Biol. Res. 6 km E Misahuali, 1°4'S 70°36'W, ~ 450m, land slide in forest, Malaise, 30 Apr–7 May 2002, Buck et al. (1 ♀, DEBU 00196386). PERU. Cuzco, Quincemil, 24–31 Oct 1962, [L. E.] Pena (1 ♀, CNC Diptera 161207); Huanuco, Tingo Maria, 2200ft., 14 May 1947, J. C. Pallister (1 ♀, AMNH); [Lima], Iquitos, type [red label], Type no 51373 U.S. N.M. [red label], USNM 2052087, Mar–Apr 1931 R. C. Shannon (1 ♀, holotype Baccha plutonia, USNM). TRINIDAD. Arima Val., Simla Res. Station, 25 Jun–29 Jul 1982, J. M. Carpenter & J. S. Edgerly (1 ♀, AMNH).
Comments. Although all females examined look very similar to R. crassum, they all have a sub-quadrate 5th abdominal segment and different genitalia from R. crassum.
The information about the abdominal characters of the holotype of B. smarti is from the Diptera curator at the BMNH (Nigel Wyatt). Curran (1939) described a female but stated that the holotype is a male. The holotype is actually a female, and based on Wyatt’s observations it agrees perfectly with this redescription.
Figure 281 in Hull (1949a) stated that the drawing was a male abdomen, from the holotype. This was an error, the holotype is a female.
description: Published as part of Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H., 2014, Revision of the genus Pelecinobaccha Shannon, description of Relictanum gen. nov., and redescription of Atylobaccha flukiella (Curran, 1941) (Diptera: Syrphidae), pp. 1-154 in Zootaxa 3819 (1) on page 93, DOI: 10.11646/zootaxa.3819.1.1, http://zenodo.org/record/251284