Victorella pavida or trembling sea mat is a species of bryozoan found in shallow waters of low or fluctuating salinity, such as lagoons and estuaries.

[2] Swanpool, a coastal saline lagoon (brackish lake), in Falmouth, has been recorded to have significant populations of Victorella pavida.

Data from 2012, recorded by the Environment Agency, suggests that this species is also present within the River Thames Estuary; albeit in low numbers.

[3] Within England, V. pavida is listed as a Natural Environment Research Council species of 'Principal Importance' (Section 41)[4] and is protected under Schedule 5 of the Wildlife and Countryside Act 1981 (as amended).

S. Kent Memoirs: On a New Polyzoon, "Victorella Pavida," from the Victoria Docks, Quarterly Journal of Microscopical Science, s2-10: 34-39.