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| Titel: |
Major radiation of cheilostome bryozoans: Triggered by the evolution of a new larval type? |
| Auteur: |
Taylor, Paul D. |
| Verschenen in: |
Historical biology |
| Paginering: | Jaargang 1 (1988) nr. 1 pagina's 45-64 |
| Jaar: |
1988 |
| Inhoud: |
A macroevolutionary model is developed to account for the “adaptive radiation”; of cheilostome bryozoans that commenced in the Cenomanian after a long phase of low diversity. Living cheilostome species possess one of two types of larvae; planktotrophic (cyphonautes) larvae of relatively long duration, and brooded non-planktotrophic (coronate) larvae of short duration. Planktotrophic larvae characterize the paraphyletic “malacostegans”; from which “advanced”; cheilostomes with non-planktotrophic larvae are thought to have evolved monophyletically. Research on other marine invertebrates suggests that gene flow within and between populations is likely to be poorer in species having non-planktotrophic larvae, and hence the frequency of allopatric and quasi-sympatric speciation may be greater. Skeletal evidence of larval brooding in the cheilostomes first appears in the late Albian, immediately before their adaptive radiation, and the evolution of non-planktotrophy with associated increase in speciation rate is proposed to have triggered this radiation. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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