mesotrocha
/mɪˈsɒtrəkə/ /ˌmɛsə(ʊ)ˈtrəʊkə/(also mesotrochae) Zoology
noun
Treated as plural. The ciliated larvae (collectively) of certain polychaete worms, characterized by one or more rows of cilia encircling the middle of the body.
Origin
Late 19th century; earliest use found in American Naturalist. From scientific Latin Mesotrocha, former genus name from meso- + ancient Greek τροχός wheel, disc + -a.