By Sarah L.Long, Howard Brunton, L. Robin M. Cocks, Sarah L Long
The expansion historical past of a brachiopod is entombed in its shell, yet examine on fossil and residing brachiopods has generated unanswered questions about those marine invertebrates. a number of participants to Brachiopods prior and current touch upon their differing constructions and morphological aspect. They use those as examples of ontogenetic and evolutionary swap, as signs of taxonomic relationships, or to debate micro-structural shell morphology. inhabitants experiences of varied species and up to date growth in molecular phylogeny are awarded. This unmarried compilation is a needs to for postgraduate scholars and researchers in evolution, zoology, geology, palaeontology and comparable fields.
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Additional info for Brachiopods Past and Present
Philosophical Transactions of the Royal Society of London, Series B, 337, 83–104. , and Mackay, S. (1994) Collagenous chitinophosphatic shell of the brachiopod Lingula. Philosophical Transactions of the Royal Society of London, Series B, 346, 223–266. C. (1997) Anatomy. ) Treatise on Invertebrate Paleontology. Part H Brachiopoda (Revised) Volume 1 Introduction (Lawrence: Geological Society of America and University of Kansas Press), pp. 7–188. O. (1998) Chemico-structural phylogeny of the discinoid brachiopod shell.
There are unresolved differences of opinion regarding the underlying mechanism of formation of modulated microstructures. Although, most modulated microstructure has been associated with diagenesis, the presence of the modulated structure in Recent brachiopods eliminates a diagenetic environment as a requirement for the formation of the texture in brachiopods. Furthermore, electron microprobe measurements indicate that the calcite studied is composed of lowmagnesium calcite. Thus, no major cation substitutions, such as excess Mg;2 in the lattice, are responsible for the modulated microstructures in brachiopod calcite.
G. , 1991; Frisia and Wenk, 1993). Reeder and Wenk (1979) first identified Modulated microstructure in New Zealand brachiopods 29 modulations in dolomite, and observed that they were similar to the tweed-like patterns observed in silicate minerals and metals. , 1983; Reeder, 1992). Although, the exact cause of the texture is uncertain, the formation of modulated microstructure appears to be related to strain exerted on the perfect lattice. g. Reeder and Wenk, 1979; Reeder, 1981; Frisia and Wenk, 1993).