Evolutionary Developmental Biology by Brian K. Hall PhD, DSc, FRSC (auth.)

By Brian K. Hall PhD, DSc, FRSC (auth.)

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Geoffroy therefore sided with Meyranx and Laurencet's thesis - it fitted his philosophy of a universal, idealistic, animal morphology. For Geoffroy, the goal of comparative anatomy was to discover the philosophical resemblances among organisms . Cuvier opposed any such association. For him cephalopods and vertebrates fell into two separate embranchements (groups, 'phyla'), Cuvier (1812a) had arranged the animal kingdom into four unrelated embranchements (for which presem day phyla or groups of phyla would be the closest approximation) on the basis of fundamemal differences in basic structural body plan; Vertebrata, Geoffroy, Cuvier and the great Academie debate 43 Fig.

2), an arthropod, with striking resemblances to the terrestrial Onychophoran, Peripatus, represents a likely ancestor to both the insects and the myriapods (millipedes and centipedes), (Cambropodus, a recently described uniramous arthropod from the Middle Cambrian marine Wheeler Formation in Utah, shares more derived characters with uniramous Fossils assignable to phyla 27 Fig. 3 Pikaia gracilens, the single chordate species from the Burgess Shale. Myomeres are clearly evident. The dorsal band is presumed to be the notochord.

Dinomischus isolatus is known from only three speeimens (Whittington, 1985, Fig. 6). Astern anehored by a holdfast supported a cup-shaped body bearing arms (tenraclesr). Hallucigenia sparsa (Fig. 7) is perhaps the most bizarre of all the Burgess Shale fossils. From its elongated body projected seven pairs of unsegmented spines whieh appeared to support the body. Dorsally were seven tentacles, eaeh terminating in a bifureated 'claw'. A cluster of tentacles were situated posteriorly on the forward-faeing 'tail'.

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