Document Detail

Decapod crustacean chelipeds: an overview.
MedLine Citation:
PMID:  11022233     Owner:  NLM     Status:  MEDLINE    
The structure, growth, differentiation and function of crustacean chelipeds are reviewed. In many decapod crustaceans growth of chelae is isometric with allometry level reaching unity till the puberty moult. Afterwards the same trend continues in females, while in males there is a marked spurt in the level of allometry accompanied by a sudden increase in the relative size of chelae. Subsequently they are differentiated morphologically into crusher and cutter making them heterochelous and sexually dimorphic. Of the two, the major chela is used during agonistic encounters while the minor is used for prey capture and grooming. Various biotic and abiotic factors exert a negative effect on cheliped growth. The dimorphic growth pattern of chelae can be adversely affected by factors such as parasitic infection and substrate conditions. Display patterns of chelipeds have an important role in agonistic and aggressive interactions. Of the five pairs of pereiopods, the chelae are versatile organs of offence and defence which also make them the most vulnerable for autotomy. Regeneration of the autotomized chelipeds imposes an additional energy demand called "regeneration load" on the incumbent, altering energy allocation for somatic and/or reproductive processes. Partial withdrawal of chelae leading to incomplete exuviation is reported for the first time in the laboratory and field in Macrobrachium species.
P Mariappan; C Balasundaram; B Schmitz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Journal of biosciences     Volume:  25     ISSN:  0250-5991     ISO Abbreviation:  J. Biosci.     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-11-27     Completed Date:  2000-11-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8100809     Medline TA:  J Biosci     Country:  INDIA    
Other Details:
Languages:  eng     Pagination:  301-13     Citation Subset:  IM    
Crustacean Aquaculture and Behaviour Unit (CRABU), Department of Animal Science, Bharathidasan University, Tiruchirapalli 620 024, India.
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MeSH Terms
Agonistic Behavior
Animal Structures / abnormalities,  growth & development,  physiology*
Brachyura / anatomy & histology,  physiology
Crustacea / anatomy & histology*,  physiology
Decapoda (Crustacea) / anatomy & histology,  physiology
Feeding Behavior
Functional Laterality
Nephropidae / anatomy & histology,  physiology
Self Mutilation
Sex Characteristics
Sexual Behavior, Animal
Species Specificity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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