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Free Content Astrosarkus idipi, a New Indo-pacific Genus and Species Of Oreasteridae (Valvatida: Asteroidea) Displaying Extreme Endoskeletal Reduction

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A new genus and species of oreasterid, Astrosarkus idipi (Asteroidea, Echinodermata) is described from the central Pacific and southern Indian Oceans. The new taxon is characterized by strong reduction and modification of the endoskeleton. Only the terminals and adambulacral spine and mouth-angle spines are externally expressed. The body wall is composed mostly of a thick, smooth flesh that obscures the abactinal, actinal, and marginal plates. The fleshy layer contains an extensive system of channels that begin in the coelom and terminate at the body surface. Also unique is the internal expression of fixed, spiny processes on the ambulacral plates within the coelom. The novel body form of Astrosarkus, parallel to the very different morphology of Acanthaster, demonstrates the morphological plasticity within the Oreasteracea and the conservative evolution of the axially derived ambulacral skeleton.

Document Type: Research Article

Publication date: November 1, 2003

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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