in addition the pressed specimen, anatomists and taxonomists prefer a portion of the specimen be preserved in 3% formaldehyde in seawater for seagrass and algae samples, or 70% ethyl alcohol for animals, and sealed in a jor for long-term storage.
other types of permanent collections may be valuable; the most common include thin sections and dried plant material.
thin sections of specimens are mounted on slides as described by pppp
These authors indicate media must be added periodically to prevent desiccation of the samples.
seagrasses may be cleaned, separated into organs, dried, and stored with a desiccant for later analyses, such as nutrient and elemental composition, or DNA analyses.