Scanning electron microscopic image of the larva of the brachiopod Terebratalia transversa. Brachiopods are marine, sessile animals. The protostomic development leads to this 300-µm-long larva that is equipped with long chaetae that facilitate floating and defence. Anterior up.
From 'The developmental basis for the recurrent evolution of deuterostomy and protostomy.' Martin-Duran et al. Nature Ecology & Evolution 1; 0005 (2016)