Balcanocerus

Maldonado Capriles, 1971

Balcanocerus is a of in the , Eurymelinae. in this genus are -attended and feed on phloem sap from plants in Rosaceae. The genus includes both North and European species, with documented associations with specific ant partners and host trees.

Balcanocerus crataegi by (c) Owen Strickland, some rights reserved (CC BY), uploaded by Owen Strickland. Used under a CC-BY license.Balcanocerus fitchi by (c) Owen Strickland, some rights reserved (CC BY), uploaded by Owen Strickland. Used under a CC-BY license.Balcanocerus provancheri by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

Pronunciation

How to pronounce Balcanocerus: /bælˈkænoʊˌsɪərəs/

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Identification

Members of Balcanocerus can be distinguished from related Idiocerini by -attended aggregative and specific associations. B. agapetomyrmices differs from B. balcanicus in colouration and male and female . B. fitchi has distinctive and black with white hooking inwards from wing connection, with two large black spots, and orange-yellow- with yellow-brown and dark brown spots.

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Habitat

Open forest environments. B. fitchi occurs in northeastern United States and southeastern Canada; B. agapetomyrmices is associated with Pyrus amygdaliformis in Bulgaria.

Distribution

North America (northeastern United States, Vermont); Europe (Bulgaria, Denmark); Palaearctic Region.

Diet

Phloem sap feeding on Rosaceae plants. B. fitchi feeds on hawthorn (Crataegus) and crab apple (Malus); B. agapetomyrmices feeds on Pyrus amygdaliformis.

Host Associations

  • Pyrus amygdaliformis Villars, 1807 (Rosaceae) - only known for B. agapetomyrmices
  • Lasius bombycina Seifert & Galkowski, 2016 (Formicidae) - partnerfeeds on excreted ; frequently visits
  • Crataegus (hawthorn) - primary for B. fitchi
  • Malus (crab apple) - primary for B. fitchi

Life Cycle

and both present; nymphs form with adults. Adult males 5.4–5.8 mm, females 5.7–6.2 mm in B. fitchi.

Behavior

Forms small of 4–6 individuals. Frequently visited by that feed on excreted ; trophobiotic relationship documented with Lasius .

Ecological Role

Phloem feeder that produces , supporting mutualists. Potential pest of Rosaceae fruit trees.

Human Relevance

Potential minor pest of hawthorn and crab apple; otherwise limited direct economic impact.

Similar Taxa

  • B. balcanicusClose to B. agapetomyrmices but differs in colouration and
  • Other Idiocerini generaBalcanocerus distinguished by -attended aggregative and specific Rosaceae associations

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Sources and further reading