Department of Biological Sciences
University of South Carolina
United States of America
Dr. Daniel Speiser is currently working as an Assistant Professor in the Department of Biology, University of South Carolina, United States of America. His research interests include Biological sciences. He is serving as an editorial member and reviewer of several international reputed journals. Dr. Daniel Speiser is the member of many international affiliations. He has successfully completed his Administrative responsibilities. He has authored of many research articles/books related to Biological sciences.
The Speiser Lab works with invertebrate animals because of their diverse phenotypes and because it allows us to target taxa specifically well-suited for particular questions. For example, we study the function and evolution of the eyes of scallops, a family of swimming bivalves. The eyes of scallops are single-chambered like the camera eyes of vertebrates and cephalopods, but use a mirror for image-formation instead of a lens. We also study certain chitons (Mollusca: Polyplacophora) that have hundreds of eyes embedded in their dorsal shell plates. These unique shell-eyes are the only eyes known to form images using lenses made of solid aragonite and they may be the most recently evolved eyes of any animal. Using these separate instances of eye evolution in mollusks, we are also investigating the co-evolution of spatial vision and complex brains. Although much of our current work concerns the visual systems of mollusks, the Speiser Lab welcomes proposals for any new projects or collaborations centered on the evolutionary physiology or visual ecology of invertebrates.
Shumway SE, Parsons GJ, editors. Scallops: Biology, Ecology, Aquaculture, and Fisheries. Elsevier; 2016 Jun 7.
Speiser DI, Gagnon YL, Chhetri RK, Oldenburg AL, Johnsen S. Examining the effects of chromatic aberration, object distance, and eye shape on image-formation in the mirror-based eyes of the bay scallop Argopecten irradians.
Ramirez MD, Pairett AN, Pankey MS, Serb JM, Speiser DI, Swafford AJ, Oakley TH. The last common ancestor of most bilaterian animals possessed at least nine opsins. Genome biology and evolution. 2016 Oct 26;8(12):3640-52.