The Collaborative International Dictionary
Tornaria \Tor*na"ri*a\, n.; pl. Tornari[ae] . [NL., fr. L. tornare to turn.] (Zo["o]l.) The peculiar free swimming larva of Balanoglossus. See Illust. in Append.
Wiktionary
n. (context zoology English) The free-swimming larva of Balanoglossus.
Wikipedia
A tornaria is the planktonic larva of some species of Hemichordata such as the acorn worms. It is very similar in appearance to the bipinnaria larvae of starfishes, with convoluted bands of cilia running around the body. It is an oval shaped, transparent larva. The diameter of the body is about 3 mm. It has got an apical plate, which is a thickened region provided by a tuft of cilia and a pair of eye spots. The larva has got a complete alimentary canal. It has ciliary bands all over its body. The ciliary band stretches throughout the anterir and posterior region,and also the post oral region.
Usage examples of "tornaria".
All the larvae, all the little nauplii and tornarias, all the microscopic things, the jelly-fish.
All the larvae, all the little nauplii and tornarias, all the microscopic things, the jelly-fish.