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Abstract
A new species of Aulacoseira Thwaites is described from sediment deposits of Surprise Lake, an isolated lake located in the New Jersey Highlands. The species is characterized by (1) a low mantle, (2) unevenly distributed mantle areolae of variable size and shape, and (3) a valve face covered by rounded areolae. The new species is most similar to Aulacoseira biseriata (Grunow in Van Heurk) Houk, R. Klee & H. Tanaka. Both taxa possess frustules with mantles that are low, with irregular pervalvar rows or scattered areolae. However, the two species differ in the shape and pattern of the areolae, the shape and structure of the mantle wall, the shape and depth of the ringleist, and other morphological features. In this study, we present light and scanning electron microscopic images of the new species and compare it to the most similar taxa.
Acknowledgements
We would like to thank Robert Gill from New Jersey Forest Fire Service, Johannus Franken and Brian Taylor, NJDEP Bureau of Freshwater & Biological Monitoring for providing help in the field and collecting the sediment core and water samples from Surprise Lake. Timothy A. Shaw, Nanyang Technological University, provided the Surprise Lake core dating. Maria Scimone and Erin Brodel, NJDEP Communications, kindly provided help with plates editing. We thank Gary Buchanan and Nicholas Procopio, NJDEP Division of Science and Research, for supporting this project. We gratefully acknowledge the use of the Materials Characterization Core Facility, Drexel University for the SEM. We would like to thank two anonymous reviewers for providing constructive comments on this manuscript.
Disclosure statement
No potential conflict of interest was reported by the author(s).