| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Zostera (Heterozostera)
Taxonomy
Zostera (Heterozostera) was named by Setchell (1935). It is extant. Its type is Zostera tasmanica.
It was reranked as Heterozostera by den Hartog (1970), Kuo (2005) and den Hartog and Kuo (2006).
It was assigned to Zostera by Setchell (1935); to Zosteroideae by den Hartog (1970); and to Zosteraceae by Kuo (2005) and den Hartog and Kuo (2006).
It was reranked as Heterozostera by den Hartog (1970), Kuo (2005) and den Hartog and Kuo (2006).
It was assigned to Zostera by Setchell (1935); to Zosteroideae by den Hartog (1970); and to Zosteraceae by Kuo (2005) and den Hartog and Kuo (2006).
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Zostera (Heterozostera) Setchell |
| 1970 | Heterozostera den Hartog p. 112 |
| 2005 | Heterozostera Kuo p. 101 |
| 2006 | Heterozostera den Hartog and Kuo p. 7 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Subg. Zostera (Heterozostera) Setchell 1935
show all | hide all
Heterozostera chilensis Kuo 2005
Heterozostera nigricaulis Kuo 2005
Heterozostera polychlamys Kuo 2005
Heterozostera tasmanica Martens 1867
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Kuo 2005 | Monoecious perennials with monopodially branched herbaceous rhizomes; rhizome internodes with four to ten cortical vascular bundles only in the outer cortex and numerous fibre bundles in both the outer and the inner cortex or only in the outer cortex. Two unbranched roots and a vegetative shoot with two to five leaves at each node. Leaves alternate, distichous; sheath open with overlapping membranous flaps, ligulate, auriculate; blade linear, longitudinal veins 3, apex obtuse to notched; margin entire; deciduous, leaving a senescent sheath; squamules 2.
Indeterminate wiry black erect stems and determinate generative shoots present or absent. Species with erect stems bearing a cluster of leaves and sometimes also three to six inconspicuous spathes. Species without erect stems producing generative shoots bearing conspicuous spathes. Spathal sheath enclosing a stalked flattened spadix on which two to twelve male and female flowers alternate in two longitudinal rows. Male flower with two free bilocular anthers, longitudinally dehiscent; pollen filamentous. Female flower with ovary containing one ovule; style short and broad; stigmata 2. Retinacules two to twelve, usually one between the two anthers. Fruit, an achene, ovoid to ellipsoid with a scarious pericarp. Seed ovoid to ellipsoid. Three species are present in temperate Australia and one species occurs in Chile. |
Measurements
No measurements are available
|
|||||
|
|
||||
| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Age range
Maximum range based only on fossils: Holocene or 0.01170 to 0.00000 Ma
Minimum age of oldest fossil (stem group age): 0.0 Ma
Minimum age of oldest fossil (stem group age): 0.0 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Holocene | Australia (South Australia) | Heterozostera nigricaulis (90127) | |
| Holocene | Australia (Western Australia) | Heterozostera polychlamys (123192) | |
| Holocene | Chile (Coquimbo) | Heterozostera chilensis (123191) | |
| Holocene | Australia (Victoria) | Zostera tasmanica (123193) |