MICHAEL J. WEEDON's research while affiliated with University of Bristol and other places
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Publications (2)
The adult shell (teleoconch) of the enigmatic tubular Givetian fossil Trypanopora is comprised of two principal layers: an outer fibrous prismatic layer and an inner micro-lamellar (irregular cross-bladed) layer, with local, closely-spaced disruptive punctation. The fine preservation suggests an original calcite composition. The shell microstructur...
Vermiform "gastropods' are reported from a variety of rocks ranging from Givetian to Lower Triassic age. Examples encrusting shells and plants have been identified in non-marine shales, in addition to previously recognized occurrences in shallow marine microbial bioherms and stromatolites. SEM studies of the planorbiform or trochiform protoconch re...
Citations
... Historically, the Ordovician to Middle Jurassic order Microconchida Weedon, 1991, informally named "microconchids", has long been mixed up with spirorbins, only later to be determined to represent a different phylum (Weedon 1991;Taylor and Vinn 2006). In contrast to the almost completely marine and only in a few cases brackish water spirorbins (Ushakova 2003), many microconchids also colonized freshwater and marginal marine environments (Zatoń et al. 2012;Zatoń and Peck 2013;Shcherbakov et al. 2021). ...
... Based on superficial resemblance to Recent serpulid polychaete tubes, microconchids were often misidentified as Spirorbis Daudin, 1800or Serpula Linnaeus, 1758(e.g., Howell, 1964Beus, 1980), or as 'vermiform' gastropods (Burchette and Riding, 1977;Bełka and Skompski, 1982). However, due to their completely different tube characteristics (i.e., bulbous larval shell, microlamellar and punctate tube), Weedon (1990Weedon ( , 1991Weedon ( , 1994 assigned the tubeworms to the tentaculitoids, and included them in a separate order Microconchida. ...
