Genus Naineris Blainville, 1828

Naineris Blainville, 1828 . Type-species: N. quadricuspida (Fabricius, 1780), by monotypy.

Synonyms:

Anthostoma Schmarda, 1861 . Preoccupied. Type-species: Anthostoma ramosum Schmarda, 1861 (= Naineris laevigata), designated by Pettibone (1957).

Lacydes Kinberg, 1866 . Preoccupied. Type-species: Lacydes havaicus Kinberg, 1866 (= Naineris laevigata), by monotypy. Polynaineris Pettibone, 1957 . Type-species: Naineris laevigata (Grube, 1855), by original designation.

Variant spellings. Naidonereis Malmgren, 1867; Nainereis Mesnil & Caullery, 1898; Naidoneris Webster & Benedict, 1887 .

Diagnosis. Prostomium rounded or truncate on anterior margin. Peristomium with one or two achaetous rings. Thorax with 12–30 or more segments; branchiae first present from setiger 2–23. Thoracic neuropodia with 0–2 postsetal lobes; no subpodial lobes. Thoracic neurosetae include capillaries, or capillaries mixed with blunt-tipped uncini, sometimes hooded, or uncini and subuluncini. Abdominal setae include capillaries and sometimes furcate setae in notopodia and capillaries and imbedded or protruding aciculae in neuropodia. Paired dorsal sensory organs present in some species.

Remarks. There are few species of Naineris known from the eastern Pacific. The most common is N. dendritica (Kinberg, 1867), which ranges from Alaska to southern California and occurs in intertidal and shallow subtidal sedi- ments (Hartman 1957; Blake 1996; Blake & Ruff 2007). Naineris cf. grubei (Gravier, 1908) was reported by Blake (1996) based on juveniles discovered in the Santa Maria Basin. However, it is likely that those specimens were actually juveniles of Naineris uncinata Hartman, 1957 . In the present study, specimens of N. uncinata were identified from gas hydrate and seep sediments off Oregon at the Cascadia Subduction Zone.