Key:  Family Nereidae

Phylum Annelida
 Class Polychaeta
  Order Phyllodocida
   Superfamily Nereidacea

Taken primarily from  Kozloff, 1987, 1996  (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
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1a  Without prostomial antennae; prostomialpalps small, inconspicuous Micronereis nanaimoensis
1b With prostomial antennae; prostomialpalps conspicuous 2
2a With 3 pairs of tentacular cirri on the peristomium; notopodia without any setae other than the aciculae [previously identified as Namanereis quadraticeps (Blanchard, 1849), which probably does not occur in the northern hemisphere] Lycastopsis sp.
2b With 4 pairs of tentacular cirri on the peristomium; notopodia with setae in addition to the aciculae 3
3a Ventral cirrus of parapodia of anterior part of the body divided near the base into 2 branches Ceratocephale loveni
3b Ventral cirrus of all parapodia simple 4
4a Tentacular cirri of peristomium constricted into several units Nicon moniloceras
4b Tentacular cirri of peristomium not constricted into several units 5
5a Segment 2 (following peristomium) enlarged, projecting anteriorly as a collarlike structure around the peristomium (commensal with large, subtidal hermit crabs) Cheilonereis cyclurus
5b Segment 2 not enlarged and not forming a collarlike structure around the peristomium 6
6a Most of the paragnaths on the everted pharynx conical 7
6b At least some of the paragnaths on the everted pharynx elongated transversely, crowded into comblike configurations, or otherwise deviating from a conical form 18
7a Notopodia of posterior portion of the body with homogomph  falcigerous setae 8
7b Notopodia of posterior portion of the body without homogomph  falcigerous setae 15
8a Distal ring of everted pharynx without paragnaths Nereis (Eunereis) wailesi
8b Distal ring of everted pharnx with paragnaths 9
9a Upper ligule of notopodia of posterior region of the body much larger than the lower ligule 10
9b Upper ligule of notopodia of the posterior region of the body not obviously larger than the lower ligule 12
10a Upper ligule of notopodia of the posterior region of the body strap-shaped (photo) Nereis vexillosa
10b Upper ligule of notopodia of the posterior region of the body not strap-shaped 11
11a
11b
12a
12b
13a
13b
14a
14b
15a Proximal ring of everted pharynx usually without paragnaths, or with only a few on area VII Nereis (Ceratonereis) paucidentata
15b Proximal ring of everted pharynx usually with paragnaths in all areas, although they may be absent in area I or V 16
16a Dorsal ligule of parapodia not obviously larger than the ventral ligule (hermaphroditic and ovoviparous; found in estuarine situations and in fresh water) Nereis (Neanthes) limnicola
16b Dorsal ligule of parapodia leaflike and much larger than the ventral ligule 17
17a Areas VII and VIII of evertedpharynx with paragnaths arranged in a band that consists of 4 or more rows Nereis (Neanthes) brandti
17b Areas VII and VIII of evertedpharynx with paragnaths arranged in 2 or 3 irregular rows (paragnaths may be absent in area I) Nereis (Neanthes) virens
18a Area VI of evertedpharynx with a large, transversely elongated paragnath Perinereis monterea
18b Paragnaths on area VI of everted pharynx neither large nor transversely elongated, but compactly arranged in such a way that they form a nearly comblike configuration (common in sediment and among Ulva and other green algae in bays) Platynereis bicanaliculata



Taxonomic Levels Represented in This Key:

  Nereis (Neanthes) brandti
  Nereis vexillosa



Page created by Dave Cowles, 2005
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