Mythimna riparia (Rambur, 1829)

Synonyms/other combinations:
Anapoma riparia

Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Adult (e.l. N-Portugal, larva in late October 2013) [S] Mythimna riparia: Young larva (N-Portugal, Parque Natural do Litoral Norte, late October 2013) [M] Mythimna riparia: Young larva (N-Portugal, Parque Natural do Litoral Norte, late October 2013) [M] Mythimna riparia: Young larva (N-Portugal, Parque Natural do Litoral Norte, late October 2013) [M] Mythimna riparia: Young larva (N-Portugal, Parque Natural do Litoral Norte, late October 2013) [M] Mythimna riparia: Young larva (N-Portugal, Parque Natural do Litoral Norte, late October 2013) [M] Mythimna riparia: Half-grown larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Larva (e.l. N-Portugal 2013) [S] Mythimna riparia: Pupa (e.l. N-Portugal 2013) [S] Mythimna riparia: Pupa (e.l. N-Portugal 2013) [S] Mythimna riparia: Pupa prior to eclosion [S] Mythimna riparia: Larval habitat in N-Portugal (Parque Natural do Litoral Norte, late October 2013). Most larvae have been recorded on the still green grasses in the lower half of the dich embankment. [N] Mythimna riparia: Larval habitat in N-Portugal (Parque Natural do Litoral Norte, late October 2013) [N] Mythimna riparia: Habitat in N-Portugal. The larval habitat of the preceding photos in next to the background in the right (late October 2013) [N]

Host plants:
The larvae feed mainly on grasses of coastal regions (Poaceae). I observed the younger caterpillars only on partly softer grasses with fresh green, not on the old and hard grasses in the dunes (Portugal, late October 2013).

Habitat:
Mythimna riparia inhabits mainly coastal regions, e.g. dunes, estuaries and related habitats. Further inland, it occasionally settles along rivers and in other wetlands.

Life cycle:
The moths occur in two generations between March and June and again in September/October. The half-grown larvae hibernate, but are mostly active during this time. I recorded them along a grassy ditch next to coastal dunes in North Portugal in late October 2013. The larvae can be obtained by beating higher growing and partly fresh grasses in autumn.

Endangerment factors:
Mythimna riparia is in decline due to the immense human impact on coastal regions (tourism, agriculture, urbanization, industry etc.), but due to its flexibility still not endangered as severe as comparative coastal species.

Remarks:
Mythimna riparia occurs from Portugal across the European Mediterranean to Turkey and the Near East.



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