Donacia

Fabricius, 1775

Species Guides

29

Donacia is a large of aquatic leaf beetles in the Donaciinae. are active, capable of sustained , and possess adaptations for both aerial and submerged existence. The genus is distinguished by a elytral apex and a pubescent area above the procoxa. Larvae develop on submerged portions of aquatic plants, while adults inhabit surface parts of the same vegetation. The genus contains approximately 113 described arranged into 15 proposed subgenera, with major radiations in the Nearctic and Palaearctic regions.

Donacia cuprea by no rights reserved, uploaded by Ingolf Askevold. Used under a CC0 license.Donacia cuprea by no rights reserved, uploaded by Ingolf Askevold. Used under a CC0 license.Donacia proxima by (c) evangrimes, some rights reserved (CC BY), uploaded by evangrimes. Used under a CC-BY license.

Pronunciation

How to pronounce Donacia: //dɔˈna.t͡ʃi.a//

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

Identification

Donacia is recognized by the elytral apex and the presence of a pubescent area above the procoxa. Like other Donaciinae, have densely pubescent undersides and long . These characters separate the from related aquatic chrysomelid genera.

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Habitat

Aquatic environments associated with emergent and floating vegetation. inhabit surface parts of aquatic plants. Larvae occur on submerged portions of plants in freshwater systems.

Distribution

Nearctic, Palaearctic, and Australasian regions. The subgenus Donacia (Donacia) s. str. contains 10 Nearctic and 5 Palaearctic ; Donacia (Donacocia) contains approximately 21 Nearctic and 75 Palaearctic species; Donacia (Cyphogaster) contains about 6 Australasian species. Specific records include South Korea, Eastern Siberia (Krasnoyarskii Krai), and southwestern Turkey.

Diet

feed on the upper of plants; some may consume pollen. Larvae feed on sap from submerged portions of aquatic plants.

Host Associations

  • Nymphaea - water lilies
  • Nymphoides -
  • Ondinea -
  • Cyperaceae - sedges
  • Sagittaria - Alismataceae
  • Sparganium - Typhaceae
  • Potamogeton - pond weed

Life Cycle

Both and larval stages have been described for multiple . Larvae are aquatic and develop on submerged plant tissues. Adults are capable of extended submersion due to a . Oviposition in Korean species exhibit three distinct patterns (Pattern I, II, III).

Behavior

are active and readily take . Adults can remain submerged for extended periods using a for respiration. Larvae are believed to breathe oxygen from plant vessels as well as cutaneously. Male combat has been documented in D. crassipes. Feeding patterns in Korean show three distinct types (Type I, II, III).

Human Relevance

Some are of conservation concern; Donacia aquatica is noted as endangered in regional assessments.

Similar Taxa

  • Other Donaciinae generaDonacia is distinguished by elytral apex and pubescent area above procoxa, whereas related lack these specific character combinations.

More Details

Subgeneric classification

The is divided into 15 proposed subgenera. The three largest are Donacia (Donacia) s. str., Donacia (Cyphogaster), and Donacia (Donacocia).

Respiratory adaptations

The allows to exploit both aerial and submerged , a functional trait that separates them from purely terrestrial chrysomelids.

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Sources and further reading