Arctia

Schrank, 1802

tiger moths

Species Guides

8

Arctia is a of tiger moths in the Erebidae, serving as the type genus for the subtribe Arctiina, tribe Arctiini, and Arctiinae. The genus was substantially expanded in 2016 following phylogenetic studies by Rönkä et al., which synonymized several previously separate genera. within Arctia exhibit aposematic warning coloration and have been subjects of long-term ecological research, including a 40-year study of Arctia virginalis in California.

Arctia caja by (c) carnifex, some rights reserved (CC BY), uploaded by carnifex. Used under a CC-BY license.Arctia plantaginis by no rights reserved, uploaded by Andreas Manz. Used under a CC0 license.Arctia by no rights reserved, uploaded by Andreas Manz. Used under a CC0 license.

Pronunciation

How to pronounce Arctia: /ˈɑrktiə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Members of Arctia can be distinguished by palpi that are porrect (extending forward) and reach beyond the , with the first two joints being hairy. Males possess bipectinate with short branches swollen at the extremity and a terminal bristle, while females have serrate antennae. The legs are hairy, with the hind tibia bearing two pairs of spurs. The forewings are notably short and broad relative to body size.

Images

Distribution

are distributed throughout North America, the Palearctic region, India, and Sri Lanka. Specific documented occurrences include the Russian Far East (Khabarovsk Krai), Finland, Great Britain, and the western coast of North America from California through Oregon and Washington.

Life Cycle

Complete with documented developmental anomalies in some . Laboratory rearing of Arctia menetriesii demonstrated a development cycle from to lasting 72–83 days, with high mortality rates prior to observed under certain dietary conditions.

Behavior

of some , such as Arctia menetriesii, are not attracted to light and are not nocturnally active, flying reluctantly and making them difficult to detect. Larvae of Arctia plantaginis exhibit -induced plasticity in warning signal expression, developing more melanized (smaller orange patch) warning signals and molting more frequently when exposed to simulated risk.

Human Relevance

Some have experienced significant declines in parts of their range, such as Arctia caja in Great Britain, making them subjects of conservation concern. The has been extensively studied for aposematic coloration evolution and -prey interactions.

More Details

Taxonomic History

Following phylogenetic studies by Rönkä et al. in 2016, multiple were synonymized with Arctia, substantially expanding the genus's content and reclassifying many previously separate species.

Research Significance

Arctia virginalis has been the subject of continuous monitoring at Bodega Bay, California since 1982, representing one of the longest-running studies of insect . Precipitation has been identified as the primary driver of abundance, with wet winters associated with higher caterpillar densities.

Tags

Sources and further reading