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Stasis for a half billion years …

File under this one under: If it ain’t broke …

In Current Biology (Volume 21, Issue 7, 612-616, 24 March 2011), we read that A 525 million year old fossil hemichordate with preserved soft tissues is the earliest and largest fossil hemichordate zooid and offers unmatched insight into the fossil anatomy and evolution of the group.

Abstract:

Hemichordates are known as fossils from at least the earliest mid-Cambrian Period (ca. 510 Ma) and are well represented in the fossil record by the graptolithinid pterobranchs (“graptolites”), which include the most abundantly preserved component of Paleozoic macroplankton [1]. However, records of the soft tissues of fossil hemichordates are exceedingly rare and lack clear anatomical details [2]. Galeaplumosus abilus gen. et sp. nov. from the lower Cambrian of China [3], an exceptionally preserved fossil with soft parts, represents by far the best-preserved, the earliest, and the largest hemichordate zooid from the fossil record; it provides new insight into the evolution of the group. The fossil is assigned to the pterobranch hemichordates on the basis of its morphological similarity to extant representatives. It has a zooidal tube (coenecium) with banding throughout comparable to that in the extant pterobranchs and a zooid with paired annulated arms bearing paired rows of annulated tentacles; it also displays a putative contractile stalk. G. abilus demonstrates stasis in pterobranch morphology, mode of coenecium construction, and probable feeding mechanism over 525 million years.

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One Response to Stasis for a half billion years …

  1. I am confused at how this discovery disproves evolution or provides evidence for ID.

    Obviously the scientists attempting to extrapolate this discovery as evidence for evolution is the typical post-hoc rationale that Darwinists use to explain everything in the fossil record….but I’m confused as to any other point.

    Based on the commentary it appears that the point is that such biological material could not survive for 525 million years but what is the alternate theory being suggested?

    That the dating methods are faulty and this and perhaps all fossils are much younger than commonly held?
    That the fossil record shouldn’t be relied on?
    …or something else?

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