Galapagos Species Checklist


Icerya purchasi

(Maskell, 1878)

Domain Eukaryota
Kingdom Animalia
Division Arthropoda
Class Insecta
Order Hemiptera
Suborder Sternorrhyncha
Superfamily Coccoidea
Family Margarodidae
Genus Icerya

Icerya purchasi  (Maskell, 1878)

 

English common name: Cottony cushion scale

Name status: Accepted name; taxon occurs in Galapagos.

Description: The Cottony Cushion Scale is a self-fertile hermaphrodite (has both male and female organs). The brownish adult (3 mm long) produces a white ridged cottony egg sack that is attached to her rear (6 mm long). 600-800 eggs are extruded into the sack and stay there during development to emerge as small crawlers that disperse. The crawler moults 3 times before becoming an adult. The final instar and adult stage are sedentary and feed on sap. They form large colonies along the branches and stems of plants and are often protected from predators by ants which, along with a black sooty mould, feed off a sugary honey waste produced by the scale.

The Cottony Cushion Scale is a self-fertile hermaphrodite (has both male and female organs). The brownish adult bug (3 mm long) produces a white ridged cottony egg sack that is attached to her rear (6 mm long). 600-800 eggs are extruded into the sack and stay there during development to emerge as small crawlers that disperse. The crawler moults 3 times before becoming an adult. The final instar and adult stage are sedentary and feed on sap. They form large colonies along the branches and stems of plants and are often protected from predators by ants which, along with a black sooty mould, feed off a sugary honey waste produced by the scale.

Last updated: 24 Jan 2014

Origin

  • In
    Introduced
  • Na
    Native

  • Ac
    Accidental

    Taxon accidentally introduced, naturalized in the wild.

  • Cu
    Cultivated
  • Er
    Eradicated
  • Es
    Escaped
  • Ic
    Intercepted
  • AcQ
    Questionable Accidental
  • NaQ
    Questionable Native

Distribution

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Galapagos island groups: Floreana, Isabela, Marchena, Pinzón, San Cristóbal, Santa Cruz, Santiago.

Widely distributed across the archipelago, including the islands of Baltra, Floreana, Isabela, San Cristóbal, Santa Cruz, Seymour Norte, Santiago, Fernandina, Santa Fé, Marchena, Pinta, Pinzon, Rabida, Genovesa, and Champion. Originally from Australia. First recorded in Galapagos on San Cristobal in


Please be aware that this distribution map is automatically generated from database records (CDF and external specimens, literature records, and observations) and may not accurately reflect the currently-known distribution for all species.

Literature

  • Causton, C.E. (2001) Dossier on Rodolia cardinalis Mulsant (Coccinellidae: Cocinellinae), a potential biological control agent for the cottony cushion scale, Icerya purchasi Maskell (Margarodidae). Charles Darwin Foundation, Galàpagos.
  • Causton, C.E., Lincango, M.P. & Poulsom, T.G.A. (2004) Feeding Range Studies of Rodolia cardinalis (Mulsant), a Candidate Biological Control Agent of Icerya purchasi Maskell in the Galápagos Islands. Biological Control 29: 315-325.
  • Causton, C.E., Sevilla, C. (2008) Latest Records of Introduced Invertebrates in Galapagos and Measures to control them. Galapagos Report 2006-2007, CDF, GNP and INGALA, Puerto Ayora, Galapagos, Ecuador, p. 142-145.
  • Lincango, M.P., Hodgson, C. & Causton, C. (2008) Lista annotada de los insectos escama (Hemiptera: Coccoidea) de las islas Galápagos, Ecuador. Charles Darwin Research Station, unpublished, 17 pp.
  • Lincango, P., Hodgson, C., Causton, C. & Miller, D. (2010) An updated checklist of scale insects (Hemiptera: Coccoidea) of the Galapagos Islands, Ecuador. Galapagos Research, 67: 3-7.
  • Liu, H., Tye, A., Jaramillo, P., Simbaña, W., Madriz, P., An, S., Wang, Z., Xu, X., Wang, F. G., Xu, H., Song, X. Q., Trusty, J., Maunder, M., Lewis, C. &Francisco-Ortega, J. (2012) Science at Fairchild: Conservation and biodiversity on Pacific Ocean Islands. Tropical Garden 65(1): 28-31.
  • Peck, S.B., Heraty, J., Landry, B. & Sinclair, B.J. (1998) Introduced insect fauna of an oceanic archipelago: The Galápagos Islands, Ecuador. Am. Entomol. 44: 218-237.
  • Peck, S.B. (2001) Small Orders of Insects of the Galápagos Islands, Ecuador: Evolution, Ecology, and Diversity. NRC Research Press, Ottawa, Ontario, Canada, 278 pp.
  • Roque-Albelo, L. (2003) Population Decline of Galapagos endemic Lepidoptera on Volcán Alcedo (Isabela Island, Galapagos Islands, Ecuador): An effect of the introduction of the cottony cushion scale? Bulletin de L'Institut Royal des Sciences Naturelles de Belgique 73: 177-180.