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2003), suggesting that eurypterids, cephalaspids, chondrichthyans and acathodians may have migrated across paleoenvironments.
Although one to one comparisons are rarely possible between ichnofauna and biotaxa, and the possibility of a hitherto unknown trace maker not represented among known body fossils in the Campbellton Formation cannot be fully excluded, we suggest that Monomorphichnus multilineatus as described here is attributed to pterygotid eurypterids.
Based on our interpretation of trace formation, measurements of Monomorphichnus multilineatus suggest that the animal that made the traces was considerably smaller than the maximum size known for these eurypterids in the Campbellton Formation.
A 'mass-moult-mate' hypothesis (Braddy 2001; Vrazo and Braddy 2011) suggested that eurypterids migrated en masse into nearshore and marginal environments such as lagoons to mate and then moult, as they probably required a quiet current-free place.
Little evidence exists for the diet and feeding strategy of pterygotid eurypterids.
Seldon (1986) indicated that the anterior walking leg (limb II) of pterygotid eurypterids was not a slender walking leg, but a small palp, as illustrated by Huxley and Salter (1859).
In Scotland, both pterygotids and hughmillerids are believed to have inhabited lacustrine environments, while stylonurid eurypterids inhabited fluvial environments.
The two outcrop belts of the Campbellton Formation that have yielded eurypterids were interpreted as having been deposited in western and eastern sub-basins by Kennedy and Gibling (2011), possibly separated by a topographic barrier.
Rare and poorly known eurypterids from Willwerath, Germany.
A single abdominal eurypterid fragment was found in these beds in 1997, just east of Point La Nim, from a hard, grey siltstone unit approximately 1.
The eurypterid bed occurs at a level 14 m above the base of section III in the marginal lacustrine facies association described by Kennedy and Gibling (2011).
Parahughmilleria provides an addition to the eurypterid fauna, previously represented only by Pterygotus.
Summary of a revision of New York State Ordovician eurypterids: implications for eurypterid palaeoecology, diversity and evolution.
Eurypterid phylogeny with remarks on the origin of arachnids.
Chelicerata: Chasmataspidida) from Lesmahagow, Scotland, and its implications for eurypterid phylogeny.
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