Topic
Edwardsia
About: Edwardsia is a research topic. Over the lifetime, 39 publications have been published within this topic receiving 507 citations.
Papers
TL;DR: The aim is to use DNA sequence data to test between vicariance and long range dispersal explanations for the origin and range of the Edwardsia species of Sophora.
Abstract: Summary
Aim The aim is to use DNA sequence data to test between vicariance and long range dispersal (by floating seed-pods) explanations for the origin and range of the Edwardsia species of Sophora (Sophoreae: Papilionoideae: Leguminosae).
Location This group is widely distributed around the South Pacific and into the South Atlantic on both continental fragments and oceanic islands.
Methods DNA sequences from an intergene region (atpB-rbcL) of the chloroplast were determined for twelve taxa (including outgroups) and used to test these hypotheses. Sophora fossils were used to calibrate the evolutionary tree.
Results The Edwardsia group of Sophora appears monophyletic and is well differentiated from other Sophora. However, the genetic difference between species within the South Pacific and to the South Atlantic is very low.
Main conclusionsThe results eliminate vicariance explanations for this section of Sophora and strongly support an origin from other (non-Edwardsia) Sophora in the north-west Pacific. Dispersal appears initially to be to Tuvalu, Lord Howe Island, New Zealand, and subsequently across the South Pacific, probably within the last 2–5 million years. Dispersal of buoyant Sophora seeds to oceanic islands is the most likely explanation of its distributions. Fossil pollen dates in New Zealand are consistent with the conclusion.
85 citations
TL;DR: Other so-called sea-anemones are the Zoanthidae and Cerianthidea, but, from the arrangement of their mesenteries, they have to be classed as separate Orders, though in all of them the primary Edwardsia mesenterie can be recognised during development or in the adult condition.
Abstract: Metridium and Adamsia are genera of the Family Sagartiadae, Sub-Order Malacactineae, Order Actiniidae, Sub-Class Zoantharia. The Malacactinese (or “True” Sea-Anemones) with the Scleractineae (or “True” Corals) make up the Order Actiniidae. In this Order there is an eight-mesenteried Edwardsia stage, and thereafter a primary cycle of six couples of mesenteries is (or may be inferred to be) completed by the addition of two pairs to the eight Edwardsia mesenteries, while succeeding cycles are formed in the exocoeles of the pre-existing mesenterial cycles. Other so-called sea-anemones are the Zoanthidae and Cerianthidea, but, from the arrangement of their mesenteries, they have to be classed as separate Orders, though in all of them the primary Edwardsia mesenteries can be recognised during development or in the adult condition. The remaining Zoantharian Order, the Antipathidae, is somewhat aberrant. Their development is unknown, but it is stated that one species, Leiopathes glaberrima , shows distinct indications of an Edwardsia stage.
41 citations
TL;DR: Difficulties in addressing relationships among sea anemones are explored in the context of a revision of the family Edwardsiidae and character support is identified for several previously proposed taxa or clades, including the genus Edwardsiella and a clade containing Nematostella and Drillactis.
Abstract: . Difficulties in addressing relationships among sea anemones are explored in the context of a revision of the family Edwardsiidae. This family has been important in discussions of relationships within Zoantharia (Cnidaria, Anthozoa), but has been poorly characterized. Genera within Edwardsiidae are characterized by a mosaic distribution of a few key characters whose actual distribution is not well understood; generalized and idealized morphology, rather than the actual distribution of characters, has been previously used to delimit genera. Microanatomy of muscles and the body wall, qualitative and quantitative information about muscle shape, and nematocyst size are combined with 18S rDNA sequences in a cladistic analysis. The results demonstrate that some traditional diagnostic features support groups different from those previously recognized. Character support is identified for several previously proposed taxa or clades, including the genus Edwardsiella and a clade containing Nematostella and Drillactis. Edwardsiidae and several of its genera are monophyletic; however, groups within the subfamily Edwardsiinae require revision and recircumscription. The genus Edwardsia is paraphyletic, and these data do not resolve Edwardsia species into monophyletic groups.
38 citations
TL;DR: The origin of Sophora sect.
36 citations
TL;DR: Sophora tomentosa, the type species of the genus Sophora, is shown by phylogenetic analyses of rbcL and ITS sequence data to be sister to Sophora sect.
33 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2020 | 1 |
| 2019 | 1 |
| 2018 | 1 |
| 2017 | 1 |
| 2016 | 1 |