Rhynchonellata Williams, Carlson, Brunton, Holmer & Popov 1996

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

Stages in the development of the larva of Terebratulina septentrionalis.... The youngest larva has two segments, a third then appears, the larva then fixes itself, and the second segment folds over the first and develops bristles round its edge.

Terebratula sella (Lower Greensand) d, Deltidium; f, foramen.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

Young larva of Cistella neapolitiana showing three segments, two eye spots, and two bundles of setae.