Key:  Family Arenicolidae (Lugworms)

Phylum Annelida
  Class Polychaeta
    Order Capitellida

Taken primarily from  Kozloff, 1987, 1996 p154.  (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
Jump to:
Lower taxonomic level Main Page Alphabetic Index Systematic Index Glossary
1a  Relatively large worms, length often exceeding 10 cm, width often exceeding 1 cm; not secreting tubes; posterior one-third of the body, behind the region bearing gills, without setae, and therefore resembling a teai; gills pinnate or bushy 2
1b Small worms, up to about 2.5 cm long and 0.5 mm wide; secreting membranous tubes coated with fine sand; gills and setae continuing nearly to the posterior end of the body, so that there is nothing that resembles a tail; gills consisting of 1-4 simple filaments Branchiomaldane simplex
2a With several pairs of esophageal caeca, those of 1 pair being much longer than the others; neuropodia of more posterior gill-bearing segments not closely approaching the midventral line 3
2b With only 1 pair of esophageal caeca; these short; neuropodia of more posterior gill-bearing segments closely approaching the midventral line Arenicola marina
3a Nephridiopores completely exposed; with 4-7 pairs of esophageal caeca; typically inhabiting muddy sand at the inner margins of bays Abarenicola pacifica
3b Ventral portions of nephridiopores covered by a flap of skin; with 8 or more pairs of esophageal caeca; typically inhabiting rather clean sand at the mouths of bays or on beaches exposed to some wave action 4
4a Usually with 8-12 pairs of esophageal caeca; usually on beaches exposed to some wave action Abarenicola claparedi subsp. oceanica
4b Usually with 12-19 pairs of esophageal caeca; usually near the mouths of sandy bays Abarenicola claparedi subsp. vagabunda



Taxonomic Levels Represented in This Key:

  Abarenicola pacifica



Page created by Dave Cowles, 2009
Edited by: