Palaeobiology of Middle Paleozoic Marine Brachiopods: A Case by Rituparna Bose

By Rituparna Bose

Fossil species seem to persist morphologically unchanged for lengthy periods of geologic time, punctuated through brief bursts of fast swap as defined via the Ecological Evolutionary devices (EEUs). right here, morphological edition in Paleozoic atrypide morphology on the subfamily point (Atrypinae and Variatrypinae) from the Silurian and Devonian time durations within the 3rd Paleozoic EEU (~444-359 my) have been investigated utilizing fairly new suggestions of quantitative modeling. The learn explains how a gaggle of heavily similar taxa in atrypide subfamilies show morphological conservation via time in P3 EEU in the jap North the USA region.

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Hist Biol 6:113–132 Gingerich PD (2001) Rates of evolution on the time scale of the evolutionary process. Genetica 112–113:127–144 Gould SJ, Eldredge N (1977) Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology 3:115–151 Hunt G (2007) The relative importance of directional change, random walks, and stasis in the evolution of fossil lineages. Proc Natl Acad Sci 104:18404–18408 Jones B (1982) Paleobiology of the upper Silurian Brachiopod Atrypoidea. J Paleontol 56:912–923 Kesling RV, Hoare RD, Sparks DK (1980) Epizoans of the middle Devonian brachiopod Paraspirifer bownockeri: their relationships to one another and to their host.

As a whole this genus seems to have lost frilly anchoring devices in favor of flattening the pedicle valve and/or enlarging the foramen through the umbo. Pseudoatrypa can be distinguished from Atrypa by its interarea, dental cavities and deltidial plates, which are missing in the latter. Pseudoatrypa was a soft muddy bottom inhabitant favouring quieter water. —Small size, rounded outline, medium ribs, relatively less widely spaced growth lamellae, rounded hinge line. 4 Atrypide Diversity 33 intervals over most of the shell, often with very large multiple frills (largest of any known atrypid group).

Acta Palaeontol Pol 43:205–240 Eldredge N, Gould SJ (1972) Punctuated equilibria: an alternative to phyletic gradualism. In: Schopf TJM (ed) Models in paleobiology. Freeman, San Francisco, pp 82–115 Fursich FT, Hurst JM (1974) Environmental factors determining the distribution of brachiopods. Paleontology 17:879–900 Gibson MA (1992) Some epibiont-host and epibiont-epibiont relationships from the Birdsong shale member of the lower Devonian Ross formation (west-central Tennessee, USA). Hist Biol 6:113–132 Gingerich PD (2001) Rates of evolution on the time scale of the evolutionary process.

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