Head pores

Dan Dauer ddauer at odu.edu
Tue Sep 21 16:29:06 EST 1999

To all:

These prostomial pits have been know in spionids for a long time.  Nancy 
Maciolek described them as prostomial peaks on two species in her 
revision of the genus Prionospio (Zoological Journal of the Linnean 
Society (1998) 84: 325-383; see Fig. 13, p. 361; see Fig. 14, p.363).  In 
Streblospio benedicti, Paraprionospio pinnata and Marenzelleria virdis 
these prostomial structures are eversible and not always obvious on 
preserved specimens. (For S. benedicti see Fig, 1, p. 421 in  Functional 
morphology and feeding behaviour of Streblospio benedicti (Polychaeta; 
Spionidae). 1984.  Linnean Society of New South Wales, pp. 418-429; 
for P. pinnata see Fig. 3b p. 146, in  Functional morphology and feeding 
behavior of Paraprionospio pinnata (Polychaeta: Spionidae).1985.  
Marine Biology  85: 143-151; and for M. viridis see Fig. 2 on. 515, in  
Functional morphology and feeding behavior of Marenzellaria viridis 
(Polychaeta: Spionidae). 1997.  Bulletin of Marine Science  60: 512-

I have called them both prostomial papillae and sensory papillae.  They 
are very similar in appearance to the palp papillae on polydorids that 
have non-motile cirri ( See. Fig. 1, p. 43 in  Potential systematic 
significance of spionid polychaete tentacular morphology 1987.  Bulletin 
of the Biological Society of Washington, No. 7, pp. 41-45.; see Figs. 1 
and 2 in Functional morphology and feeding behavior of Polydora 
commensalis. 1991. Ophelia Suppl. 5: 607-614.)  

I suspect that these structures may be widely distributed in polychaetes
and easily overlooked because they are eversible.

Dan Dauer

Daniel M. Dauer
Professor and Eminent Scholar
Department of Biological Sciences
Old Dominion University
Norfolk, Va.  23529
phone:  757-683-4709
fax: 757-683-5283
email:  ddauer at odu.edu

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