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Manatee Grass
Syringodium isoetifolium
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A seagrass growing on sandy sea floors. The leaves are cylindrical with a round cross-section, distributed in tropical waters around Okinawa and the Southwest Islands. Together with Zostera species, it forms seagrass beds and serves as a vital foundation for coastal ecosystems.
Identification Points
- βLeaves cylindrical (round in cross-section), 10β30 cm long
- βAnchored to sandy-muddy sea floors by rhizomes
- βEntirely submerged, with underwater (hydrophilous) pollination
Habitat
Shallow sandy sea floors around the Southwest Islands and Okinawa
Season
Year-round
Morphological TraitsAI-estimated, needs verification
Growth form
Herb
Habitat
Aquatic
Leaf type
Simple
Venation
Parallel
Leaf dissection
Undivided
Ovary position
Superior
Plant sex
Dioecious
Phylogenetic Positionγ·γ©γΉγη§ β
Phylogenetic Position
Angiosperms > Monocots > Alismatales > Cymodoceaceae
Divergence Era
Paleogene (ca. 55 Ma onwards)
Evolution Notes
Cymodoceaceae is a group of angiosperms fully adapted to submarine life, having acquired hydrophilous pollination, an entirely different pollination mode from terrestrial plants.
View on evolution timeline βSources & References
AI-generated, needs verification