Marine Plankton: A Practical Guide

abundant adult animals antenna antennal scale antennules aperture appendages approximately bears black pigment body British Isles British waters carapace cells chaetognath characteristic chromatophores coastal waters coasts common commonest Conchoecia copepods d'identification du zooplancton diameter diatoms distinguished dorsal spine eggs elegans English Channel exopodite eyes Family female fifth abdominal segment gonads hydroid inshore plankton larva larval stage lateral spines length lobe lorica mainly male marginal tentacles maxillipeds medusa megalopa muscle bands mysid nauplius nematocysts newly hatched larva North Atlantic North Sea northern North norvegica obvious organisms pelagic plankton Plate pleopods Plymouth polychaetes post-larval posterior margin posteriorly Postero-lateral radial canals reaches rostral spine rostrum S.W. Ireland Sagitta sample setae setosa shell Sub-order surface swimming leg telson thoracic limbs thoracic segments trochophore uropods urosome usually valve veliger velum ventral western whilst whorls widely distributed width yolk sac zoea zoeae zoeal stage zooplankton