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The Arm of the Starfish is a young adult novel by Madeleine L'Engle, first published in 1965. It is the first novel featuring Poly O'Keefe and the O'Keefe family , a generation after the events of A Wrinkle in Time (1962).
When a starfish finds itself upside down, two adjacent arms are bent backwards to provide support, the opposite arm is used to stamp the ground while the two remaining arms are raised on either side; finally the stamping arm is released as the starfish turns itself over and recovers its normal stance.
The starfish body plan consists of five to six arms radiating from a central disk. Regenerative ability differs greatly among starfish species, but can generally be classified within three categories: unidirectional regeneration, disk-dependent bidirectional regeneration, and disk-independent bidirectional regeneration.
Adam Eddington III is a major character in three young adult novels by Madeleine L'Engle.A marine biology student, he is the protagonist of The Arm of the Starfish (), and a reluctant romantic love interest for Vicky Austin in A Ring of Endless Light (), a romantic relationship that continues in Troubling a Star ().
A starfish has five identical arms with a layer of “tube feet” beneath them that can help the marine creature move along the seafloor, causing naturalists to puzzle over whether sea stars have ...
Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, such as the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars. They are part of the water vascular system.
Heliaster helianthus is a multi-armed starfish, the number of arms usually being in the range 28 to 39, and the diameter typically being between 16 and 20 cm (6 and 8 in). The aboral (upper) surface is brown with reddish tubercles while the oral (under) surface is white or yellowish-white.
The main elements, to determine the various species from photo, are: the appearance of the dorsal marginal plates and spines, the size, the shape of disc and arms. For a good identification by sea photo it is important to take a complete picture of all the subject, a picture of the detail of the marginal plates and to measure as precisely as ...