Ostracods, supported by other proxies, are suggestive of past seagrass.
Seagrass ostracod faunas began in the Campanian (Late Cretaceous).
Ostracods may be related to mid-Cretaceous halophytes.
Indication of longevity and fidelity of ostracod–seagrass relationship.
For past seagrass interpretation, a multiproxy approach is useful.