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You are here:   OldClasses > 2012 > Alloeocomatella pectinifera | Shuting Jin

 

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Alloeocomatella pectinifera

(Clark 1911)

Red Feather Star

Shuting Jin (2012)

 

Fact Sheet

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Summary


Physical Description


Ecology


Local Distribution and Habitats


Commensalisms


Life History & Behaviour


Reproduction


Feeding


Cyclicity


Anatomy and Physiology


External Anatomy


Internal Anatomy


Physiology


Evolution & Systematics


Fossil Record


Phylogeny


Biogeographic Distribution


Conservation


Status


Threats


Resources


References


Acknowledgements


Contact

Internal Anatomy


Brief Summary

Key internal features of feather stars:
  • A network of canals called the water vascular system.
  • Mutable connective tissue.

​The Water Vascular System

The water vascular system is a feature found in all echinoderms and functions in feeding, circulation, respiration, and locomotion. The tube feet of echinoderms are the external parts of the water vascular system. Uniquely among echinoderms, crinoids to not have a madreporite opening into the water vascular system, instead, water enters into the canals via numerous tiny pores on the fleshy oral surface of the body.


​Mutable Connective Tissue

The connective tissue joining the ossicles of echinoderms is composed chiefly of collagen (Ruppert et al. 2004). Collagen is both elastic and strong, and echinoderms can manipulate these properties under neuronal control to make the connective tissue stiff or loose (Ruppert et al. 2004). This allows them to become stiff without the use of muscles, or become very flexible to navigate around obstacles or avoid predators (Ruppert et al. 2004). Mutable connective tissue also functions in autotomy, the ability of enchinoderms to drop and regrow their appendages (Baumiller 2008). Feather stars are very prone to dropping their arms when disturbed.



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Classification

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