Relictanum

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), Zootaxa 3819 (1), pp. 1-154 : 87

Relictanum species key

1. Metatarsus entirely dark; female occiput usually with dorsal scale-like white pile.................................. 5

- Metatarsus bicoloured (dark and pale) ( Fig. 44 g); female occiput with dorsal black pile.............................. 2

2. Frontal triangle with silvery white pollen restricted to margins and continuous with facial pollen.................................................................................................... Relictanum fiametta [ Panama]

- Frons/frontal triangle with silver pollinosity forming a lateral pair of semi-circles, usually not connected to facial pollen... 3

3. Males................................................... Relictanum crassum , or R. johnsoni (males unknown)

- Females............................................................................................ 4

4. Female 5th abdominal segment sub-quadrate, only slightly wider than long (around 1.1 times as wide as long).................................................................. Relictanum johnsoni [ Guyana, Ecuador, Peru and Trinidad]

- Female 5th abdominal segment rectangular, more than 2 times as wide as long............................................................................... Relictanum crassum [ Colombia, east to Guyana and south to central Brazil]

5. Fourth abdominal tergite uniformly pigmented, without pale markings ( Fig. 44 g).................................. 8

- Fourth abdominal tergite with central pale vittae or spots ( Fig. 46 b)............................................ 6

6. Fourth abdominal tergite with central pale vittae.................. Relictanum schwarzi [ Costa Rica, Colombia and Peru]

- 4th abdominal tergite with 6 pale spots, 2 baso-laterally and 4 centrally.......................................... 7

7. Third abdominal tergite with 4 pale spots ( Figs. 42 a–b)............................. Relictanum adspersitum [ Brazil]

- Third abdominal tergite with 6 pale spots ( Figs. 46 a–b).......... Relictanum magisadspersum [ Costa Rica and Venezuela]

8. Male frontal triangle with black pile, female frons with white pile; dorsal ⅓ of frons as narrow as vertex; lateral ocelli on female touching eye margin; wing entirely microtrichose, entirely light brown (male) or mainly hyaline (female); alula linear and twice the width of the c cell................................ Relictanum nero [ Mexico and south to central Brazil]

- Frons/frontal triangle usually with white pile; dorsal ⅓ of frons wider than vertex; lateral ocelli on female distanced from eye margin; wing usually with basal cells bare, if entirely microtrichose then wing with basal ½ dark and distal ½ hyaline; alula convex and 3 times the width of c cell.................................................................... 9

9. Wing dark on basal ½, entirely microtrichose; only known from females................................................................................................. Relictanum shropshirei [ Mexico and south to Venezuela]

- Wing entirely infuscated, with bare basal cells................. Relictanum braziliensis [ Brazil, Mexico and Puerto Rico]

Figures

FIGURE 42. Relictanum adspersitum sp. nov. a – b. Holotype, female: a. Habitus, dorsal. b. Abdomen, dorsal. c – d. Female genitalia: c. Dorsal. d. Lateral. e – h. Male genitalia: e. Epandrium, lateral. f. Epandrium, ventral. g. Hypandrium, lateral. h. Hypandrium, ventral. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.

FIGURE 44. Relictanum crassum (Walker, 1852). a – b. Female genitalia: a. Dorsal. b. Lateral. c – f. Male genitalia: c. Surstylus, ventral. d. Subepandrial sclerite, ventral. e. Hypandrium, lateral. f. Hypandrium, ventral. g. Male, habitus, dorsal. 8 tg: 8 th tergite, 10 tg: 10 th tergite, cerc: cercus, s scl: subepandrial sclerite.

FIGURE 46. Relictanum magisadspersum sp. nov., holotype. a. Habitus, dorsal. b. Abdomen, dorsal. c – f. Male genitalia: c. Surstylus, ventral. d. Suepandrial sclerite, ventral. e. Hypandrium, lateral. f. Hypandrium, ventral.