Identified polychaetes included representatives from 20 different families, primarily Ampharetidae
, Glyceridae, Nephtydae, Onuphidae, Opheliidae, and Terebellidae.
Polychaetes, primarily of the Family Ampharetidae, comprised a large proportion of the overall prey, decreasing in importance from 43.
Polychaete worms in the Family Ampharetidae comprised the most important prey item, but declined in consumption across the transect.
From the 30 families previously reported for San Quintin lagoon, 23 have been collected and 6 families were added: Ampharetidae, Oweniidae, Scalibregmatidae, Sternapsidae, Dorvilleidae and Sigalionidae.
Species 1995 1998 AMPHARETIDAE Ampharete labrops Harman, 1961 x Ampharete sp x Amphicteis acutifrons Grube, 1850 x Amphicteis sp Grube, 1850 x CAPITELLIDAE Capitella capitata Fabricius, 1780 x x Mediomastus californiensis Hartman, 1944 x x Mediomastus sp x x Notomastus magnus Hartman, 1947 x Notomastus tennis Moore, 1909 x x Notomastus sp x CIRRATULIDAE Aphelochaeta marioni Saint-Joseph, 1894 x Aphelochaeta sp x Cirriformia spirabranchia Moore, 1904 x x Monticellina tesselata Harman, 1960 x Protocirrineris socialis Blake, 1996 x Protocirrineris sp x COSSURIDAE Cossura candida Hartman, 1955 x x Cossura sp A x x DORVILLEIDAE Dorvillea sp x EUNICIDAE Lysidice ninetta Verril, 1900 x Marphisa disjuncta Harman, 1961 x M.
from East Pacific Rise hydrothermal vents.
By contrast, the families commonly found in soft sediments, being less mobile and feeding mainly on sediments, such as the Maldanidae, Spionidae or Ampharetidae
, are scantily represented in the collections of the islands of the Mexican Pacific (Table 1).
Most abundant families were Spionidae, Oweniidae, Cossuridae, and Ampharetidae
, which accounted for 64% of the total polychaete fauna.