Phycology Section, Patrick Center for Environmental Research, Academy of Natural Sciences of Drexel University. Closterium sp. 1 ? (NADED 316990). https://diatom.ansp.org/taxaservice/ShowTaxon1.ashx?naded_id=316990. Accessed 24 Apr 2019. This web service reports all information about a given algae taxon available at the time of retrieval.