Paropsis atomaria

Olivier, 1807

Dotted Paropsine Leaf Beetle

Paropsis atomaria is a leaf beetle in the Chrysomelinae, native to eastern Australia. The name 'atomaria' refers to its speckled or freckled appearance. It has become an economically significant pest of Eucalyptus plantations in Queensland and New South Wales, and has been introduced to the west coast of North America. Females produce up to 600 , deposited at leaf or twig tips. The species typically completes two per summer across most of its range.

Paropsis atomaria 75669160 by Russell Best. Used under a CC BY 4.0 license.Paropsis atomaria 266768218 by Damian Harding. Used under a CC BY 4.0 license.Eucalyptus Tortoise Beetle (3371832482) by Ian Sutton from Oberon, Australia. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Paropsis atomaria: /pəˈɹɒp.sɪs ˌæt.əˈmɛər.i.ə/

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Habitat

Eucalyptus plantations and native eucalypt forests, particularly in subtropical and temperate regions of eastern Australia. hibernate in litter and soil beneath trees.

Distribution

Eastern Australia from Adelaide to Brisbane, with substructuring between southern (Canberra) and northern (Queensland, northern New South Wales) regions. Introduced to the west coast of North America.

Seasonality

Active November to May in the Australian Capital Territory, with two completed annually. emerge in autumn and enter reproductive in response to shortening day-length, hibernating through winter.

Diet

Eucalyptus foliage. Laboratory studies indicate larvae feed on Eucalyptus blakelyi and Eucalyptus cypellocarpa. First instar larvae require foliage with nitrogen concentrations above 1% for survival; low-nitrogen leaves are too tough for feeding.

Host Associations

  • Eucalyptus blakelyi - preferred for oviposition and larval development
  • Eucalyptus cypellocarpa - laboratory rearing
  • Eucalyptus cloeziana - plantations in south-eastern Queensland

Life Cycle

Four larval instars with mean durations of 3.2, 3.4, 3.6, and 5.6 days respectively at 25°C; total larval development averages 15.8 days. occurs in soil beneath trees. emerge in autumn and enter reproductive . is size-dependent, with average females maturing more than 600 .

Behavior

Larvae are highly gregarious across all four instars. Females tend to oviposit on the first suitable tree encountered after . are competent fliers but show limited in practice.

Ecological Role

Herbivore and defoliator of Eucalyptus . Serves as for multiple and hyperparasitoids, forming a complex in plantation .

Human Relevance

Pest of Eucalyptus plantations in eastern Australia, causing defoliation of plantation trees. Subject to research targeting its natural enemies.

Similar Taxa

  • Paropsis obsoletacongeneric ; differs genetically with ~14% mitochondrial divergence from P. atomaria
  • Paropsis charybdiscongeneric eucalyptus pest; distinguished by different associations (Eadya daenerys)

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Sources and further reading