Oberthür's grizzled skipper

Pyrgus armoricanus
Pyrgus armoricanus. Side view
Dorsal view
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Hesperiidae
Genus: Pyrgus
Species: P. armoricanus
Binomial name
Pyrgus armoricanus
(Oberthür, 1910)

Oberthür's grizzled skipper (Pyrgus armoricanus) is a species of skipper (family Hesperiidae). The species is named after the French entomologist Charles Oberthür (1845–1924) who originally described it.

Subspecies

Subspecies include:[1]

Distribution and habitat

This species can be found throughout Europe although it is commoner in the south and absent from the British Isles and most of Scandinavia.[2] It is also present in Northwest Africa.[3] These butterflies mainly inhabit hot grassy flowery meadows[3] and in dry, rocky and herbaceous forests, at an elevation of 0–1,800 metres (0–5,906 ft) above sea level.[4]

Description

Pyrgus armoricanus has a wingspan of 24–28 mm.[5] Both wings have a white fringe along the edges. The upperside of the forewings is dark brown with well developed white markings. On the recto of the hindwings there are clearly visible grayish marks. The underside of the hindwings shows a pale reddish-brown colour with a large pale discal spot and light coloured veins.[3] The males and females are similar in appearance.

Oberthür's grizzled skipper

Like all Pyrgus species, it can be very difficult to identify in the field. The upperside of the forewings are often noticeably darker brown than other Pyrgus species, especially when fresh, with clear white markings. It resembles some smaller races of large grizzled skipper (P. alveus). It is slightly larger than Pyrgus malvae.

This species is quite similar to Pyrgus carthami, Pyrgus alveus, Pyrgus serratulae and Pyrgus malvae.[5]

The eggs are yellowish, roundish and flattened, with numerous, strong longitudinal ribs. The caterpillars have strong short hairs. They are mostly dark brown to gray-brown, rarely greenish brown or reddish-brown with a black head. Pupae are strongly bluish-frosted with black dots and dashes on the back.

Biology

P. armoricanus flies in May and June with a second generation in the south of the range in August and September.[3][5] Adults of this second generation are usually smaller than those of the first. The females lay their eggs individually on the underside of the leaves of host plants.

In most of Europe the larva feeds on Potentilla species (Potentilla tabernaemontani, Potentilla reptans, Potentilla arenaria, Potentilla pedata) and woodland strawberry (Fragaria vesca).[5][1] In southern Scandinavia (Sweden and Denmark), however, the main larval food plant is Filipendula vulgaris and to some extent also Helianthemum nummularium.[6][7] The caterpillar overwinters.

Bibliography

References

  1. 1 2 Funet
  2. ↑ Fauna europaea
  3. 1 2 3 4 Eurobutterflies by Matt Rowlings
  4. ↑ Butterflie Guide
  5. 1 2 3 4 European Butterflies and Moths
  6. ↑ Eilers, S. (2013). "Micro-climate determines oviposition site selection and abundance in the butterfly Pyrgus armoricanus at its northern range margin". Ecological Entomology. doi:10.1111/een.12008.
  7. ↑ Paolo Mazzei, Daniel Morel, Raniero Panfili Moths and Butterflies of Europe and North Africa
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