Author:
McCobb Lucy M. E.,Bassett Michael G.
Abstract
Machaeridians are marine Palaeozoic fossils, known from sediments of early
Ordovician to mid Permian age (Bengtson, 1978; Cooper and Grant, 1972; Kaasa,
1992). Rare, completely articulated specimens reveal that they were long, slender,
bilaterally symmetrical animals, covered by a dorsal scleritome comprising
longitudinally arranged series of calcite sclerites (e.g., Adrain et al., 1991;
Högström and Taylor, 2001a, 2001b). However, most known machaeridians, including
those described in this paper, comprise isolated disarticulated sclerites. Until
recently, the taxonomic affinities of the group were uncertain, and historically
they were assigned to a number of different phyla (e.g., see Adrain, 1992).
However, the recent account of an exceptionally preserved specimen with soft
tissue anatomy, from the Lower Fezouata Formation (Lower Ordovician, Tremadocian)
of Morocco, now indicates that machaeridians were annelid worms (Vinther et al.,
2008).
Publisher
Cambridge University Press (CUP)
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