pluteus

[ ploo-tee-uhs ]

/ ˈplu ti əs /

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noun, plural plu·te·i

[ploo-tee-ahy], /ˈplu tiˌaɪ/, plu·te·us·es.

the free-swimming, bilaterally symmetrical larva of an echinoid or ophiuroid.

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Origin of pluteus

1825–35; <New Latin; Latin: breastwork, movable shelter

plu·te·al, plu·te·an, adjective

Through these the eggs are discharged into the water, where they become free-swimming larv, called Pluteus.
The Sea-beach at Ebb-tide|Augusta Foote Arnold
The smallest fragment which is capable of reaching the pluteus stage possesses the mass of about one-eighth of the whole egg.
The Organism as a Whole|Jacques Loeb
Pluteus, a free-swimming larval stage in the development of echinoderms, 54.
The Biological Problem of To-day|Oscar Hertwig
It grew abundantly there, along with Lepiota Americana and Pluteus cervinus.
The Mushroom, Edible and Otherwise|M. E. Hard

The presence of lateral arms is however a distinctive characteristic of the Ophiuroid Pluteus.
The Works of Francis Maitland Balfour, Volume II (of 4)|Francis Maitland Balfour