Ramphoprionid

Taxobox
fossil_range = Ordovician(or earlier?) - Silurian (or later?)
regnum = Animalia
phylum = Annelida
classis = Polychaeta
ordo =
familia = Ramphoprionida

The Ramphoprionids are a family of polychaete worms known from the Ordovician and Silurian periodsCitation
author = Eriksson, Mats
year = 2001
title = Silurian Ramphoprionid Polychaetes From Gotland, Sweden
volume = 1
issue = 75
pages = 993–1015
doi = 10.1666/0022-3360(2001)075<0993:SRPFGS>2.0.CO
month = September] (and more?)

References