Elophila rivulalis
Elophila rivulalis
Elophila rivulalis is a butterfly of the family Crambidae.
Features
The moths reach a wingspan of 20-25 millimeters. Body and wings are white and have a similar drawing as Elophila nymphaeata. The drawing has a more gray-brown tint and is greatly reduced in comparison with the similar type. A relatively reliable distinguishing feature is the comparatively small diskozellulare spot on the hind wing. This is usually filled white inside and clearly separated from the distal line. The Submarginalbereich of both pairs of wings is very pale, grayish tint and inside edged with gray spots. The fringe scales are slightly mottled. The vein R2 arises separately at the Diskoidalzelle of the front wing. Distal it merges on a short section of vein R3 4 and then separates in the direction of the wing edge from her again.
The genital armature of the males is similar to that of Elophila nymphaeata and Elophila feili, on Costalrand of the blades is like Elophila bourgognei but only a strongly sclerotized bristle. The uncus is blunt, the Gnathos is slightly shorter than the two similar species. The phallus is provided with two long Cornuti and a terminal, sclerotized plate with three teeth. In Elophila bourgognei contrast, only a long cornutus is formed.
In females, the ovipositor is relatively short and strong and slightly dilated basally has apophyses. The ductus bursae is sclerotized extremely short and strong. It widens in the direction of the ostium. The ductus seminalis arises from the upper part of the corpus bursae. A Signum is not formed.
Similar Species
The similar kind Elophila Nymphaea is on average slightly larger than E. rivulalis.
Dissemination
Elophila rivulalis is widespread in Europe from the Netherlands to Sicily and from France to Poland. In addition, the species occurs in Croatia, Greece and Corsica and Sardinia.
Biology
The moths fly in the late afternoon on the banks of streams, copulation was observed by Klimesch around 18:00 clock in the evening. In Italy, the flight time ranged from June to September. In older literature, butterfly finds have also been documented from April, which could be an indication that the species forms two generations per year. At appropriate places probably more than two generations may arise. The species is very rare. This must also have been previously been the case, since only single specimens were caught. The preimaginal stages are unknown. It is believed that the live aquatic crawler.
System
There are known the following synonyms:
- Hydrocampa rivulalis Duponchel, 1833
- Nymphula rivularis Hannemann, in Illies 1967 misspelling