Rivula sericealis

Straw dot
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Superfamily:	Noctuoidea
Family:	Erebidae
Genus:	Rivula
Species:	R. sericealis
Binomial name
Rivula sericealis (Scopoli, 1763)

Rivula sericealis, the straw dot, is a moth of the family Noctuidae. The species was first described by Giovanni Antonio Scopoli in his 1763 Entomologia Carniolica. It is found in Europe including the Iberian Peninsula and southern Fennoscandia and south to North Africa. In an easterly direction, the species occurs across the Palearctic to the Pacific Ocean and Japan. The species closely resembles Evergestis forficalis.

Technical description and variation

For a key to the terms used, see Glossary of entomology terms.

The wingspan is 18–22 mm. The length of the forewings is 13–15 mm. Forewing triangular, the apex rectangular, the termen curved; veins 7, 8, 9 stalked. Forewing straw yellow, becoming deeper terminally; with a black-brown reniform stigma containing two black dots; inner and outer lines brownish, obscure, the outer sinuous, excurved round the cell; hindwing luteous (mud coloured) with a yellow tinge, darker terminally.

Biology

The moth flies from May to October depending on the location.

Larva green; dorsal line darker; subdorsal white; head greenish ochreous. The larvae feed on various grasses, such as false brome and purple moor grass.

Habitats include moist grasslands, wasteland, sparse forests, alder forests and parklands.

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  Larva
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  Illustration Figs. 4, 4a, 4b the same larva in various stages of growth 4c pupa 4d much magnified figure of 4
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  Museum specimen

External links

• Kimber, Ian. "72.002 BF2474 Straw Dot Rivula sericealis (Scopoli, 1763)". UKMoths. Retrieved 15 February 2020.
• "Rivula sericealis (Scopoli, 1763)". Fauna Europaea. Retrieved 15 February 2020.
• "09008 Rivula sericealis (Scopoli, 1763) - Seideneulchen". Lepiforum e. V. Retrieved 15 February 2020.