A New Species of Saccocirrus (Archiannelida) from the West Coast of North America
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1969-04
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University of Hawai'i Press
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Abstract
A new species of archiannelid, Saccocirrus eroticus, from shell gravel
from Orcas Island, Washington, U.S.A., is described. The species is characterized by
being 1 to 2.2 cm long when adult and comprising up to 125 body segments. It has
unilateral gonads which begin in segment 13 and run to an achaetous region at the
pygidial end; thus it has over 100 segments bearing reproductive organs. The
achaetous region is composed of 4 to 11 segments. There are two tail lappets bearing
7 to 22 papillate ridges. The internal anatomy is described in detail and compared
with other known species of Saccocirrus. Eggs released from females showed
normal spiral cleavage and trocophores developed after 24 hours. The relationship
of the saccocirrids to the protodrilid archiannelids and orbiniid polychaetes is
discussed in relation to feeding and locomotory structure and function.
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Gray JS. 1969. A new species of Saccocirrus (Archiannelida) from the West Coast of North America. Pac Sci 23(2): 238-251.
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