Renovation and computerization of ANSP Diatom Herbarium



The ANSP Diatom Herbarium database can be searched by taxon, geographical location, collector/donor/source, or catalogue number. The database is still under construction, but users can access an interim version at the link below.


Encyonema temperei | Navicula canalis | Navicula escambia | Navicula notha | Navicula subrostellata | Navicula symmetrica | Navicula venerablis | Nitzschia biacrula | Nupela frezelii | Nupela pennsylvanica | Nupela poconoensis | Planothidium abbreviatum | Planothidium biporomum | Platessa hustedtii | Platessa stewartii | Psammothidium chlidanos | Surirella stalagma |


Diatom Herbarium, The Academy of Natural Sciences of Drexel University
Diatom Herbarium, Online Database



The Academy of Natural Sciences of Philadelphia (ANSP) has been one of the important centers of diatom studies in the U.S. since the 19th century. In 1950's, Dr. Ruth Patrick assembled personal collections of F.W. Lewis, C. Febiger, J.A. Shulze, F.J. Keeley, and C.S. Boyer into a single Diatom Herbarium. Dr. Charles Reimer, the Curator of the Herbarium for almost 50 years, together with Dr. Patrick developed the Herbarium into a key resource for diatom research. Contributors and members of the Editorial Review Board for the Diatoms of the United States regularly participating in taxonomic workshops held at the Diatom Herbarium and use its resources to clarify various taxonomic problems and to create taxa pages.

The goal of the project supported by the National Science Foundation was to make the resources of ANSP Diatom Herbarium easily accessible to scientists. The current Herbarium staff members created a new online database, which includes a gallery of images of type specimens. Imaging of type specimens led to re-evaluation of several taxa, the results of which were published in the scientific literature and contributed to this online flora. The reorganization of the Herbarium that includes re-housing of the materials, entering data into database, and georeferencing is on-going.


National Science Foundation

Grant DBI 0840406 | Marina Potapova


Marina Potapova

Assistant Curator, Diatom Herbarium, Academy of Natural Sciences Philadelphia of Drexel University
Review Board, This Website

Jen Beals

Collection Manager, Diatom Herbarium, Academy of Natural Sciences of Drexel University

Jonathan English

Research Assistant, Diatom Herbarium, Academy of Natural Sciences Philadelphia

Ian O'Malley

Undergraduate Student, Coop Program, Drexel University

Alys Kirsch

Curatorial Assistant

This project was first entered on 13 February, 2012 by Marina Potapova