Alagoasa

Bechyné, 1955

Species Guides

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Alagoasa is a of flea beetles (Chrysomelidae) comprising approximately 140 distributed in the Neotropics. Members possess the enlarged hind characteristic of Alticinae, enabling jumping locomotion. Several species have been investigated as agents for species, with documented specificity to Verbenaceae. The genus exhibits distinctive meiotic cytology, including direct microtubule connections between unpaired during .

Alagoasa by (c) Lucas Rubio, some rights reserved (CC BY), uploaded by Lucas Rubio. Used under a CC-BY license.Alagoasa by no rights reserved, uploaded by Kahio Tiberio Mazon. Used under a CC0 license.Alagoasa by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Alagoasa: //ˌæl.ə.ˈɡoʊ.sə//

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Identification

Distinguished from other flea beetle by the combination of Neotropical distribution and the typical alticine : compact body, enlarged hind with thickened hind legs adapted for jumping, and often metallic coloration. -level identification requires examination of male genitalia and subtle external characters. The subgenus Oedionychus has been recognized based on internal morphology.

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Habitat

Associated with vegetation in Neotropical regions; specific occupy where their plants grow. Alagoasa parana occurs in southern Brazilian vegetation supporting tiliaefolia and L. glutinosa. Larval stages require moist, friable soil at the base of host plants for within silk cocoons.

Distribution

Neotropical region, with records from southern Brazil (Alagoasa parana), Puerto Rico (Alagoasa januaria), and broader South and Central American distributions implied by the -level range.

Seasonality

Alagoasa parana shows activity from October to April in southern Brazil, with adults. Abundance varies seasonally from 4-8 adults per 100 branches. with -to-adult development spanning 80-90 days during the active season.

Diet

Foliage and flowers of plants. Alagoasa parana feeds on tiliaefolia and L. glutinosa (Verbenaceae) in its native range. may produce minor feeding damage on alternative plants including Verbena bonariensis, Clerodendrum speciosissimum, Passiflora edulis, and Helianthus annuus, but complete development occurs only on Lantana .

Host Associations

  • Lantana camara - Required for complete development; target for
  • Lantana tiliaefolia - Native in southern Brazil
  • Lantana glutinosa - Native in southern Brazil
  • Verbena bonariensis - minor feeding feeding only, no development
  • Clerodendrum speciosissimum - minor feeding feeding only, no development

Life Cycle

. laid in litter at base of plant. Larvae develop on foliage, then descend to pupate in moist, loose soil within silk cocoons at the host plant base. follows; adults overwinter. Complete development from egg to adult requires 80-90 days under field conditions.

Behavior

and larvae feed openly on plant foliage and flowers. Adults overwinter in sheltered positions and oviposit at the base of host plants. Jumping escape response typical of flea beetles when disturbed.

Ecological Role

Herbivore specializing on Verbenaceae, with potential to limit growth where abundant. Has been evaluated as a agent to reduce Lantana camara in Australia.

Human Relevance

Investigated as a agent for camara in Australia. Alagoasa parana and A. extrema have undergone -specificity testing for this purpose. Alagoasa parana showed high specificity, completing development only on Lantana among 55 plants tested.

Similar Taxa

  • Other Alticinae generaShare jumping hind legs and general flea beetle ; distinguished by genitalia and geographic distribution
  • UroplataAnother evaluated for biocontrol; differs in larval habits and

More Details

Meiotic cytology

Alagoasa (subgenus Oedionychus) exhibits unusual -I spindle organization in . and univalent are separated by a mitochondrial and move polewards at different times. Unpaired sex chromosomes remain at the periphery and are connected by microtubule bundles extending between their kinetochores, often persisting into anaphase. This distinctive has been studied using immunofluorescence and confocal microscopy.

Sources and further reading