Heteromysis cancelli sp. n., paratype female with 6.4 mm body length (A, C, D, H, J, L, M) with one of its larvae (N), paratype male 6.9 mm (B, E–G, K). A maxilla, caudal B first thoracopod, caudal aspect, with thoracic sternites 1-8, ventral C second maxilliped, ventral, detail (D) shows modified seta E–M series of dactylus in thoracic endopods 1-8 with claw (if present), caudal N nauplioid larva at late substage 2, lateral.