16 Peringia ulvae

16 Peringia ulvae

Patterned heads
Lower right: Only patterned specimen among 58 others with all-black heads in tidal pool, Dee Estuary, Cheshire, England. Salinity 33 p.p.t.
Others: Aust, Severn Estuary, England. Salinity 22.7 p.p.t.