PUBLICATION: Proceedings of the Academy of Natural Sciences of Philadelphia, Special Volume

Proceedings of the Academy of Natural Sciences contains papers in the areas of systematics, taxonomy, evolution, biogeography, and ecology. We are grateful to the authors, reviewers, and ANSP's Production Editor, Kyle Luckenbill.

The North American Diatom Symposium: A brief history, 1970-2024 Mark B. Edlund, Julie A. Wolin, Adam J. Heathcote Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 1-9, (11 February 2026).

Diatom Camp: Sixty years of Ecology and Systematics of Diatoms at Iowa Lakeside Lab Mark B. Edlund, Sarah A. Spaulding Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 11-30, (11 February 2026).

Notes on the genus Humidophila R.L. Lowe et al. from the USA Paula C. Furey, Kalina M. Manoylov, Rex L. Lowe Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 31-39, (11 February 2026).

Valve Ultrastructure and Systematic Position of Rhopalodia wetzelii Hustedt (Rhopalodiales, Bacillariophyceae) J. Patrick Kociolek, Megan Greenwood, Amelia A. Vouilloud, José Guerrero, Silvia E. Sala, Felipe Serino, Sarah E. Hamsher, Scott Miller, Jingchun Li, Aimee Caye G. Chang, Tomoko Borsa Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 41-48, (11 February 2026).

100 years later: new discoveries and observations on ceticolous diatoms Thomas A. Frankovich, Roksana Majewska, Michael J. Sullivan, Jessica L. Huggins, Joshua G. Stepanek, Matt P. Ashworth, Randall S. Wells Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 49-77, (11 February 2026).

Alien invader or latent species revived by environmental change?—the jury is still deliberating Loren L. Bahls Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 79-83, (11 February 2026).

Eunotia mobileensis sp. nov. (Bacillariophyceae) and other elongate Eunotia described from Alabama, USA Paula C. Furey, Lynn A. Brant Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 85-94, (11 February 2026).

Chirality: an informative and underutilized morphological feature of raphid diatoms (Bacillariophyceae) Lane J. Allen, Mark B. Edlund Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 95-109, (11 February 2026).

Diatom and other algal herbarium holdings in Iowa, USA Stephen P. Main, James L. Wee Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 111-123, (11 February 2026).

Diatoms of the Alaskan Arctic Coastal Plain prior to recent climate change: a reexamination of Leonard Freese's collections Marina Potapova, Sylvia Leppik Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 125-184, (11 February 2026).

Drought response and anthropogenic impacts as recorded in a high desert terminal lake, northern Great Basin USA, during the last millennium Ayowole G. Fifo, Paula J. Noble, Ana Carolina Ruiz-Fernández, Darren J. Larsen, James B. Simmons, Adam Z. Csank, Sudeep Chandra Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 185-202, (11 February 2026).

Placoneis jovanovskiana sp. nov. (Bacillariophyceae), a new species from Lake Tanganyika, East Africa Sristika Adhikari, Hirak Parikh, Jeffery R. Stone Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 203-210, (11 February 2026).

Influence of Aerial Exposure Length on Mortality and Assemblage Structure of Benthic Stream Diatoms Aimee Byington, Victoria L. Shaw Chraïbi Proceedings of the Academy of Natural Sciences of Philadelphia 169 (1), 211-226, (11 February 2026).