Adalia

Mulsant, 1846

ladybugs, lady beetles, ladybirds

Adalia is a of () containing two : A. bipunctata (two-spot ) and A. decempunctata (ten-spot ladybird). These are found across the Palearctic region. Both species exhibit color pattern and possess alkaloid chemical defenses. A. bipunctata is known to harbor multiple male-killing including , , and Spiroplasma, though symbiont phenotypes vary geographically.

Adalia decempunctata by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.Adalia decempunctata by (c) Barry Walter, some rights reserved (CC BY), uploaded by Barry Walter. Used under a CC-BY license.Adalia decempunctata by (c) Barry Walter, some rights reserved (CC BY), uploaded by Barry Walter. Used under a CC-BY license.

Pronunciation

How to pronounce Adalia: //əˈdeɪ.li.ə//

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Identification

Distinguished from other by the combination of small size, rounded body shape, and characteristic spot patterns: A. bipunctata typically bears two spots on red or black , while A. decempunctata displays ten spots with highly variable pattern . Both show pronotal markings that differ from the convergent markings of Hippodamia or the distinct patterns of Coccinella.

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Habitat

Gardens, parks, and urban environments; also found in natural vegetation including meadows, hedgerows, and woodland edges.

Distribution

Palearctic region, from Scandinavia and the British Isles south to Italy and Portugal, east to the Urals; easternmost records include Yekaterinburg. Specific documented from Prague, Rome, Florence, Hamburg, Paris, Stockholm, Moscow, Feodosia, Yalta, and Merseyside (UK).

Seasonality

emerge in spring (March–April) after ; active through growing season when is available.

Diet

and other small soft-bodied ; may supplement with pollen and nectar when is scarce.

Host Associations

  • Aphids - primary food source
  • Hesperomyces virescens - fungal observed on A. bipunctata, transmitted during mating
  • Wolbachia - endosymbiontmale-killing detected in A. bipunctata; not detected in A. decempunctata
  • Rickettsia - endosymbiontdetected in A. bipunctata and in A. decempunctata from Stockholm and Feodosia; single origin suggested for Adalia
  • Spiroplasma - endosymbiontdetected in A. bipunctata; single in A. decempunctata from Merseyside with divergent strain; phenotype varies geographically
  • Centistes - detected as cobiont in A. decempunctata specimen
  • Beauveria - detected as cobiont in A. decempunctata specimen

Ecological Role

of and other small ; contributes to of agricultural and garden pests. Chemical defenses (adaline and adalinine alkaloids) provide protection against .

Human Relevance

in gardens and agriculture due to ; used in programs. Subject of citizen science (e.g., U.K. Survey) to track changes and impacts.

Similar Taxa

  • Coccinella septempunctataBoth are common European with spotted ; Coccinella has seven spots and distinct pronotal pattern with convergent marks, while Adalia have two or ten spots with different pronotal markings.
  • Harmonia axyridis harlequin has highly variable spot patterns that can resemble Adalia; distinguished by larger size, M-shaped pronotal marking, and behavioral differences including tendency to aggregate in buildings for .
  • Hippodamia convergensConvergent has similar body shape but distinguished by convergent orange markings on black and typically 12-13 spots on .

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Sources and further reading