Tuesday Talks presents Dr. James Thomka 9/13/22

[Kristin Short]

Tuesday Talks presents Dr. James Thomka, Assistant Professor of the Center
for Earth and Environmental Sciences at SUNY Plattsburgh, speaking on
"Fossil parasites of ancient echinoderms: An evolutionary story" this *Tuesday,
September 13, 2022 at 4:30pm* in the Alumni Conference Room (Angell College
Center) and via Zoom. Below is an abstract of Dr. Thomka's presentation.

In spite of the historic emphasis on competition, antagonistic biotic
interactions are increasingly recognized as major drivers of long-term and
large-scale evolutionary trends.  Predator-prey relationships over
evolutionary timescales have been extensively studied, but an equally
important form of antagonistic interaction--that involving parasites and
hosts--remains more poorly understood, primarily because of limitations
imposed by biases in the fossil record.  Fortunately, stalked echinoderms
(pelmatozoans) are characterized by a rare combination of properties that
make them ideally suited for study of the effects of host-selective
parasitic infestation over deep (i.e., evolutionarily significant)
timescales.  This presentation focuses on the two most common
manifestations of parasitism in pelmatozoan echinoderm hosts: development
of swollen pit structures and encrustation by platyceratid gastropods.
Morphological, ecological, and other effects driven by parasitism of host
lineages are highlighted in the context of evolutionary change.


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Meeting ID: 930 5779 9954
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