Eadmuna guianensis St Laurent & Dombroskie

St. Laurent, Ryan A. & Dombroskie, Jason J., 2015, Revision of the genus Eadmuna Schaus, 1928 (Lepidoptera, Mimallonidae) with a description of a new species from French Guiana, ZooKeys 494, pp. 51-68 : 55-59

Taxon classification Animalia Lepidoptera Mimallonidae

Eadmuna guianensis St Laurent & Dombroskie sp. n. Figs 3, 4, 9, 12, 18

Type material.

Holotype: Mana River, Fr. Guiana. May, 1917. Acc. 6008, " Cicinnus esperans Schaus," St Laurent diss.: 9-14-14:3, HOLOTYPE ♂ Eadmuna guianensis St Laurent and Dombroskie, 2015 [handwritten red label]. Deposited Carnegie Museum of Natural History. Type locality: French Guiana, Mana River.

Paratypes: 4 males: GUYANA: 1 male: Tumatumari, Rio Potaro, Br. Guiana, Ac. 5615, St Laurent diss.: 10-27-14:1, PARATYPE ♂ Eadmuna guianensis St Laurent and Dombroskie, 2015 [yellow label]. Deposited American Museum of Natural History; FRENCH GUIANA: 3 males: Mana River, Fr. Guiana. May, 1917. Acc. 6008, " Cicinnus esperans Schaus," USNM-Mimal: 2510, St Laurent diss.: 11-1-14:1, PARATYPE ♂ Eadmuna guianensis St Laurent and Dombroskie, 2015 [yellow label]. Deposited National Museum of Natural History; Mana River, Fr. Guiana. May, 1917. Acc. 6008, PARATYPE ♂ Eadmuna guianensis St Laurent and Dombroskie, 2015 [yellow label]. Deposited Carnegie Museum of Natural History; Mana River, Fr. Guiana. May, 1917. Acc. 6008, " Cicinnus esperans Schaus," illegible label, St Laurent diss: 9-14-14:2, PARATYPE ♂ Eadmuna guianensis St Laurent and Dombroskie, 2015 [yellow label]. Deposited Cornell University Insect Collection.

Diagnosis.

Similar in general appearance to Eadmuna esperans but recognizable by darker overall brownish coloration, more acutely, slightly hooked forewing apex, and a vesica bearing a spiked, curved cornutus as opposed to a scobinate patch. The cornutus of Eadmuna paloa , unlike that of Eadmuna guianensis , is not curved. No other Eadmuna is known to occur in northern South America.

Description.

Male. Head: As for genus. Thorax: As for genus. Legs: As for genus but tibial spurs slightly thinner, half to entirety of spurs covered in fine scales. Forewing dorsum: Forewing length: 18-20 mm, avg. 19 mm, n=5. Triangular, convex margins becoming concave near apex, apex accentuated. Brown coloration more predominant than silvery gray, especially distally from thorax, with less extensive speckling due to relative lack of dark, petiolate scales. Discal spot not prominent, elongated, hyaline, yellowish opaque, with M2 vein separating hyaline patch into two distinct regions. Postmedial line bulging in costal half, scalloped, narrowly interrupted by veins, weaker on costal third except for dark wedge on costa. Antemedial line weak with dark chevron at costal margin. Forewing venter: Darker and lighter areas more finely defined though not particularly darker or lighter overall from dorsum. Postmedial line only somewhat slightly better defined than on dorsum. Hindwing dorsum: Rounded, with slightly pronounced anal angle, bearing similar coloration as forewings; postmedial line present, usually well developed, roughly parallel to outer margin, though angled slightly more inward on inner half than in other species. No hyaline patches present. Hindwing venter: Darker and lighter areas more finely defined though not particularly darker or lighter overall from dorsum. Postmedial line only somewhat better defined than on dorsum. Wing venation: As for genus but R4 + R5 slightly longer stalked. Abdomen: Coloration as for thorax, mostly concolorous with dorsal wing color. Genitalia: n=4. As for genus, simple but most structures thinner and weaker than other species. Uncus teardrop shaped, extended apically, very thin apically, highly truncated basally. Ventral lobes of tegumen subtriangular, ridged; ridges thicker and more pronounced than for Eadmuna esperans . Valves simple, relatively thin. Sclerotized plate, dorsal to juxta and phallus, broad, rounded dorsally. Phallus, simple, cylindrical, pointed when viewed ventrally/dorsally, vesica sac-like, bulbous with single curved cornutus bearing four or five spikes that increase in size distally. Female. Unknown.

Etymology.

Named for the Guianas from where all the specimens were collected.

Distribution.

This species is only known from Guyana and French Guiana and thus represents a significant disjunction in geographic distribution of the genus, the other three Eadmuna species being found in southern and southeastern Brazil.

Remarks.

Eadmuna guianensis is known from the Amazon Rainforest, very distant from the range of its three congeners. This disjunction is unlikely to be due to an artefact of under-sampling in intervening areas because the Amazon region is well collected for Mimallonidae (R. St Laurent pers. obs.). Despite the seemingly geographic isolation and distance from the localities of the other species of Eadmuna , this species clearly belongs to this genus due to the characters of the genitalia, which are very similar to those of the type species and, surprisingly, bear aspects similar to Eadmuna esperans in wing pattern and valve structure and to Eadmuna paloa in the vesica.