Skip to main content
Article thumbnail
Location of Repository

Population structure of graptolite assemblages

By Charlie J. Underwood


Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at different times. Survivorship analyses of graptolite faunas from the Ordovician and Silurian demonstrate strong similarities in the mortality rates of unrelated graptolites of similar functional morphology. It also shows a strong correlation of decreasing mortality rates amongst more mature colonies with increasing rhabdosome complexity. This similarity in both functional morphology and life history of graptolites suggests that they lived within a very stable planktic community structure

Topics: es
Publisher: Wiley
Year: 1998
OAI identifier:

Suggested articles


  1. 1993a: The position of graptolites within Lower Palaeozoic planktic ecosystems. doi
  2. 1993b: The Taphonomy of Graptolites.
  3. (1994). Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period. doi
  4. (1995). Biform cortical structure in the graptolite Cryptograptus insectiformis.
  5. (1993). Biotic crisis in the history of the Upper Silurian graptolites. A palaeobiological model. doi
  6. (1958). Cornwallis and Little Cornwallis Islands, District of Franklin, Northwest Territories. doi
  7. (1991). Feeding strategies of graptolites.
  8. (1970). Graptolinthina, with sections on Enteropneusta and Pterobranchia In
  9. (1986). Graptolite biofacies and correlation of eustatic, subsidence and tectonic events in the M.-U. doi
  10. (1992). Graptoloid feeding efficiency, rotation and astogeny. doi
  11. (1970). Isolated graptolites from the Bollerup and Klubbudden
  12. (1970). Isolated graptolites from the Bollerup and Klubbudden Stages of Dalarna,
  13. (1991). Isolated graptolites from the Llandovery of Kallholen, doi
  14. (1990). Juvenile sessility, vertical automobility and passive lateral transport as factors in graptoloid evolution.
  15. (1991). Late Ordovician extinction of the Graptoloidea. doi
  16. (1992). Life histories and population structure of Pennsylvanian brachiopods from North-Central Texas as determined from size-frequency analysis.
  17. (1947). Life tables for natural populations of animals. doi
  18. (1964). Lower Palaeozoic plankton. doi
  19. (1991). Mid Silurian pelagic and hemipelagic sedimentology and palaeoceanography.
  20. (1989). New evidence for the life habits of graptiloids from physical modelling.
  21. (1984). Palaeoecology of graptolitic black shales.
  22. (1993). Population analysis and orientation of graptoloids from the Middle Ordovician Utica Shale,
  23. (1969). Population dynamics of Triticites ventriculosus (Fusulinacae), Hughes Creek Shale,
  24. (1964). Population structure in paleoecology.
  25. (1969). Some thoughts on the ecology, mode of life and evolution of the Graptolithina.
  26. (1992). Survivorship analysis of fossil taxa when real-time extinction rates vary: the Paleogene planktonic formanifera.
  27. (1991). Taphonomy and time-averaging of marine shelly faunas. doi
  28. (1986). The enigma of graptolite ancestry : lesson from a phylogenetic debate.
  29. (1986). The monotypic 'population' accompanying the leucotype of Saetograptus varians (Wood doi
  30. (1991). Wenlock (Silurian) graptolites, Cape Phillips Formation, Canadian Arctic Islands. doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.