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Apart from the Phyllopod Bed of the Burgess Shale (Middle Cambrian) polychaete …
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Biology Articles » Paleobiology » Paleozoology » The earliest annelids: Lower Cambrian polychaetes » Mode of life
Mode of life - The earliest annelids: Lower Cambrian polychaetes
The great majority of the Sirius Passet fauna appears to have been benthic, being either sessile (e.g., sponges) and vagrant, mostly in the form of diverse arthropods and the halkieriids. Evidence of infaunal activity is restricted to narrow and simple trace fossils, and there is no reason to think that these are a product of this polychaete. Indeed such evidence as we have suggests that Phragmochaeta was epifaunal. Thus, it is assumed that the worm locomoted by virtue of its neuropodial chaetae, with the dorsal equiva− lents forming a protective thatch. The mode of feeding re− mains uncertain, and the rare gut contents (Fig. 6F) are not particularly informative.
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