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Report on the occurrence of abnormal four-armed red-knobbed starfish Protoreaster linckii (Echinodermata: Astroidea), Tuticorin coast, south-east coast of India

Published online by Cambridge University Press:  20 May 2015

G. Chelladurai ,
S. Balakrishnan ,
G. Jayanthi ,
K.K. Ajeesh Kumar  and
J. Mohanraj
G. Chelladurai*
Affiliation:
Department of Zoology, Marine Gastropod Hatchery and Research Laboratory, Kamaraj College, Manonmaniam Sundaranar University, Tuticorin 628 003, Tamil Nadu, India
S. Balakrishnan
Affiliation:
Department of Marine Science, School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
G. Jayanthi
Affiliation:
Department of Marine and Coastal Studies, Madurai Kamaraj University, Madurai, Tamil Nadu, India
K.K. Ajeesh Kumar
Affiliation:
Department of Biochemistry, Central institute of Fisheries Technology, Kochi, India
J. Mohanraj
Affiliation:
Department of Zoology, Marine Gastropod Hatchery and Research Laboratory, Kamaraj College, Manonmaniam Sundaranar University, Tuticorin 628 003, Tamil Nadu, India
*
Correspondence should be addressed to: G. Chelladurai, Department of Zoology, Marine Gastropod Hatchery and Research Laboratory, Kamaraj College, Manonmaniam Sundaranar University, Tuticorin 628 003, Tamil Nadu, India email: chellam.zoo@gmail.com
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Abstract

Starfish are echinoderms that live among corals and occur from the supra-littoral to the hadal zone. Deviation from pentamerism is a rare phenomenon in starfish and was observed in the red-knobbed starfish (Protoreaster linckii) collected from the Tuticorin coast, India. Eighty-five specimens were collected and, among these, one was found to be abnormal and had only four arms. The reasons for this abnormality may be due to the changes that occur during larval metamorphosis or caused by an abnormal regeneration of the arm.

Keywords

abnormal star fishPentamarismProtoreaster linckiiGulf of Mannar
Type
Research Article
Information
Marine Biodiversity Records , Volume 8 , 2015 , e64
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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