World Library  
Flag as Inappropriate
Email this Article

Austromegabalanus psittacus

Article Id: WHEBN0016861942
Reproduction Date:

Title: Austromegabalanus psittacus  
Author: World Heritage Encyclopedia
Language: English
Subject: Barnacles, List of Chilean ingredients, Paila marina, Horsehair crab, Cryphiops caementarius
Collection: Animals Described in 1782, Barnacles, Crustaceans of the Eastern Pacific Ocean, Edible Crustaceans, Invertebrates of Chile
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Austromegabalanus psittacus

Austromegabalanus psittacus
Two picorocos and two Chilean sea urchins
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Maxillopoda
Infraclass: Cirripedia
Order: Sessilia
Family: Balanidae
Genus: Austromegabalanus
Species: A. psittacus
Binomial name
Austromegabalanus psittacus
Molina, 1782[1]

Austromegabalanus psittacus, the giant barnacle or picoroco as it is known in Spanish, is a species of large barnacle native to the coasts of Chile and southern Peru.[2] It inhabits the littoral and intertidal zones of rocky shores and normally grows up to 30 centimetres (12 in) tall with a mineralized shell composed of calcite.[3] The picoroco barnacle is used in Chilean cuisine and is one of the ingredients in curanto.

Contents

  • Description 1
  • Biology 2
  • Distribution 3
  • Uses 4
  • References 5

Description

Austromegabalanus psittacus is a large sessile barnacle that lives in groups on hard substrates. It has a tall cone-shaped carapace composed of twelve large plates made of calcite microcrystals which are cemented together. The basal disc is firmly cemented to a hard surface. It grows to a height of 30 centimetres (12 in). There is an opening at the top with a hinged operculum through which the thoracic limbs known as "cirri" protrude. The general colour is dull white with purple and brown markings.[4]

Biology

Austromegabalanus psittacus is a simultaneous hermaphrodite. Individual barnacles are fertilised by sperm passed through a slender tube extended by a neighbouring barnacle. The eggs are retained inside the carapace where they are incubated for about three or four weeks. They then hatch into free swimming nauplius larvae which form part of the plankton. These pass through six stages over the course of about 45 days, the last being a cyprid stage. These larvae are about 1 mm (0.04 in) long and settle on the seabed, usually in the proximity of other barnacles. Often the larvae settle so close together that hummocks are formed as the juvenile barnacles grow. Under these circumstances the calcareous base becomes modified into a more porous, cylindrical form above which the carapaces tower, the central individuals being about twice as tall as the outside ones. The density of the barnacles in the hummocks can be more than 1000 individuals per square metre (11 sq ft).[5] This ability to form hummocks give this species an advantage when they are competing for space with other species of barnacle.[5]

Distribution

Austromegabalanus psittacus is found along the coasts of Chile and Peru in the littoral and intertidal zone. It is most common in the Los Lagos area in Chile and is harvested for human consumption, mainly in the towns of Calbuco, Carelmapu and Puerto Montt.[6]

Uses

This barnacle forms part of Chilean cuisine.[7] Its meat is highly prized and is one of the ingredients of the Chilean dish curanto. This is traditionally made from various seafood ingredients cooked in a large pit preheated with red-hot stones. Modern cooking methods use a large pot, conventionally heated.[8]

Overfishing has reduced the quantities of Austromegabalanus psittacus available for commercial harvesting. There are plans to cultivate it along the coast of Chile and there are possibilities of exporting it to Japan.[6]

References

  1. ^
  2. ^
  3. ^
  4. ^
  5. ^ a b
  6. ^ a b
  7. ^ )
  8. ^
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.