Nereis

Nereis
Eunereis longissima
Scientific classification
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Phylum:	Annelida
Class:	Polychaeta
Subclass:	Palpata
Order:	Phyllodocida
Family:	Nereidae
Genus:	Nereis Linnaeus, 1758
Species
Nereis abbreviata Nereis abnormis Nereis acuminata Nereis acutifolia Nereis aegyptia Nereis aequisetis Nereis agnesiae Nereis agulhana Nereis aibuhitensis Nereis albanyensis Nereis albipes Nereis allenae Nereis anchylochaeta nereis anomala Nereis antipoda Nereis apalie Nereis arenaceodonta Nereis articulata Nereis bassi Nereis bifida Nereis bolivari Nereis brandti Nereis brevicirris Nereis brisbanensis Nereis broa Nereis burmensis Nereis caecoides Nereis callaone Nereis camiguina Nereis camiguinoides Nereis capensis Nereis cavifrons Nereis cebuensis Nereis chilkaensis Nereis chingrighattensis Nereis circognatha Nereis cirriseta Nereis coccinea Nereis cockburmensis Nereis corallina Nereis costae Nereis coutierei Nereis coutieri Nereis cricignatha Nereis cricognatha Nereis cultrifera Nereis denhamensis Nereis deplanata Nereis divaricta Nereis diversicolor Nereis dorsolobata Nereis dumerili Nereis dumerilii Nereis eakini Nereis ehlersi Nereis ehlersiana Nereis ehrenbergi Nereis elitoralis Nereis ethiopiae Nereis eugeniae Nereis excisa Nereis falcaria Nereis falsa Nereis fasciatus Nereis festiva Nereis filicaudata Nereis flagellipes Nereis flava Nereis flexuosa Nereis foliosa Nereis funchalensis Nereis fusifera Nereis ghardaqae Nereis gilchristi Nereis gisserana Nereis glandicincta Nereis glandulosa Nereis goagirana Nereis grubei Nereis pelagica Nereis vexillosa Nereis virens

Nereis is a genus of polychaete worms in the family Nereidae. It comprises many species, most of which are marine, including the sandworm (Nereis virens) and the common clam worm (Nereis succinea). Nereis possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor chaetae are for crawling, and are the bristles that are visible on the exterior of the polchaeta.

Nereis are osmoconformers.

Nereids are dioecious and they release their haploid gametes into the water medium, a process called spawning. Moreover, upon fertilization and mitotic divisions of the zygote, Nereids form a larval stage which is similar to that of molluscs -- i.e. a Trocophore larva.

Eunereis pelagica