This is a list of species that are contained by the genus: •
Posidonia angustifolia Cambridge and Kuo •
Posidonia australis Hook.f. South coast of
Australia. •
Posidonia coriacea Cambridge and Kuo •
Posidonia denhartogii Kuo and Cambridge •
Posidonia kirkmanii Kuo and Cambridge •
Posidonia oceanica (
L.)
Delile – This plant is
endemic to the
Mediterranean Sea, where it forms undersea
meadows. •
Posidonia ostenfeldii den Hartog •
Posidonia robertsoniae Kuo and Cambridge •
Posidonia sinuosa Cambridge and Kuo The species described by
Linnaeus,
Posidonia oceanica, is found in the Mediterranean; the rest are located around the southern coast of Australia. Some species are endemic
seagrasses of Western Australia, all the Australian species are found in that region's diverse habitats. This arrangement was divided into two complexes: the
Posidonia australis and
Posidonia ostenfeldii groups. Some species descriptions may only be regional characteristics, and may need further revision. In 2006 a
clonal colony of
P. oceanica was discovered south of the island of
Ibiza which measured 8 km across and is possibly up to 100,000 years old. ==Taxonomy==