Order ECHIUROINEA Bock, 1942
Ochetostoma australiense [I. Grant, in Edmonds 2000]
© Copyright I. Grant.
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Order ECHIUROINEA Bock, 1942
Introduction
The longitudinal musculature in the Echiuroinea lies between the outer circular and inner oblique layers. This group shows no marked sexual dimorphism, has a closed vascular system and lacks anal respiration. The nephridia are usually paired and not numerous and anal vesicles are sac-like or tubular, bearing small sessile funnels. The order comprises two families, Echiuridae and Thalassematidae.
General References
Edmonds, S.J. 2000. Phylum Echiura. pp. 353-374 in Beesley, P.L., Ross, G.J.B. & Glasby, C.J. (eds). Polychaetes & Allies: The Southern Synthesis. Fauna of Australia Vol. 4A Polychaeta, Myzostomida, Pogonophora, Echiura, Sipuncula. Melbourne : CSIRO Publishing Vol. 4 Part A xii 1-465 pp.