Alarval stage particular to the lophotrochozoa is called a

trochophore or trochosphere

Explanation:

All the species belonging to the trochozoan clade such as

a) annelids

b) sipunculans

c) nemerteans

d) entoprocts

e) molluscs and

f) echiurans

These phylas all together constitute the part of the Lophotrochozoa which has trochophore larvae in their life cycl. Trochophore (trochosphere) are free swimming and translucent  larva which possess characteristic of marine annelids mollusks. They have cilia which are hair like structure for movement.

From the above information it is clear that A larval stage particular to the lophotrochozoa is called a trochophore or trochosphere

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