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Issue: Vol. 783 No. 3: 5 Nov. 2026
Type: Article
Published: 2026-11-05
DOI: 10.11646/phytotaxa.783.3.3
Page range: 237-254
Abstract views: 37
PDF downloaded: 1

New Neidium (Neidiaceae: Bacillariophyta) Pfitzer species from a clear water lake in the Brazilian Amazon (Santarém, Pará, Brazil)

Universidade Federal do Oeste do Pará; Instituto de Ciências e Tecnologia das Águas; Curso Bacharelado em Ciências Biológicas; Programa de Pós-Graduação em Mestrado Profissional em Rede Nacional em Gestão e Regulação de Recursos Hídricos – ProfÁgua; Avenida Vera Paz; s/n - Bairro Salé; CEP 68.035-110; Santarém; Pará; Brasil
Canadian Museum of Nature; Station D; P.O. Box 3443; Ottawa; Canada; K1P 6P4
Algae floodplain lake Neidiaceae Neotropics taxonomy ultrastructure

Abstract

Two new species of Neidium, Neidium saire and Neidium mocorongo, are described from Verde Lake, located in the lower central region of the Amazon Basin, Brazil. Verde Lake is a clear water lake characterized by low pH (5.5–5.9), low conductivity (5.4–7.6 µS cm-1), and shallow Secchi depth (0.8–1.45 m). The lake has poorly buffered waters with seasonal algal blooms, driven by natural and anthropogenic disturbances. The new species contributes to a diverse flora of unique species from the Amazon region. Currently, more than 25 Neidium taxa are recognized in the Amazon, comparable to species numbers in other parts of South America and North America. In this study, similarities in valve morphologies between the North American species and Amazonian species of Neidium are considered, suggesting possible similarities in morphological development between continents.

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How to Cite

Pereira, A.C. & Hamilton, P.B. (2026) New Neidium (Neidiaceae: Bacillariophyta) Pfitzer species from a clear water lake in the Brazilian Amazon (Santarém, Pará, Brazil). Phytotaxa 783 (3): 237–254. https://doi.org/10.11646/phytotaxa.783.3.3