the total species complement of a particular sample or deposit type

the reproductive part of the body of polychaetes that contains the gametes and which swarm into the water column at a single episodic event at the end of the life of the adult

growing on the surface of rock

having separate sexes (cf. hermaphroditic)

a planktonic larval stage of crustaceans (prawns and crabs)

the collective term for sand, gravel and crushed rock.

the removal of marine aggregate from the seabed by means of a dredger

a cargo taken aboard a dredger without alteration of the Gravel:sand ratio by screening

a group of small crustaceans recognised by their laterally compressed bodies

a non-quantitative dredge used to sample organisms from the seabed