Paleonet: New early Cambrian tommotiid monograph [SEC=UNCLASSIFIED]

[Pierre & Peta Kruse]

The usual question: Emma Chisett?
Pierre

On 17 December 2015 at 13:36, Laurie John <John.Laurie at ga.gov.au> wrote:

> Recently Published:
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> SKOVSTED, C.B., BETTS, M.J., TOPPER, T.P. & BROCK, G.A., 2015. The early
> Cambrian tommotiid genus *Dailyatia *from South Australia. *Memoirs of
> the Association of Australasian Palaeontologists 48*, 1-117.
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> Abstract:
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> The camenellan tommotiid *Dailyatia *is one of the most common fossils in
> shallow water carbonates from Cambrian Stages 2-4 in South Australia
> (Arrowie and Stansbury basins). Six species of *Dailyatia *are documented
> and new terminology for describing camenellan sclerites is introduced. *Dailyatia
> *sclerites are found in three fundamental sclerite types (A-C), each of
> which may be present in one to three sub-types depending on species. The
> previously described species *Dailyatia ajax *Bischoff 1976 and *D.
> macroptera *(Tate 1892) are revised and four additional species are
> described for the first time from South Australia. These include *D.
> odyssei *Evans & Rowell 1990, previously known only from Antarctica, and
> two new species; *D. bacata *sp. nov. and *D. helica *sp. nov. as well as
> a species left under open nomenclature. Two of the recognised species (*D.
> macroptera *and *D. helica*) occur in two different ecophenotypic
> variants. Species and variants are defined by differences in sclerite types
> present in the scleritome, sclerite morphology and ornament. The sclerites
> of *Dailyatia *are finely laminated with distal expansion of laminae
> supporting the prominent concentric ribs. The external surface is covered
> by a fine reticulate network which indicates that the sclerites were at
> least partly embedded in soft integument. The pattern of incremental growth
> reveals specific initial and possible gerontic growth stages with unique
> surface sculptures. Evidence of physical damage and growth disturbances is
> common in *Dailyatia *sclerites and many specimens reveal preferential
> abrasion of the apex. Apical canals are present in all sclerites and are
> connected to specialised internal apical structures.
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> The internal surface of the sclerites in most species reveals raised
> platforms and depressed, scar like areas forming unique patterns in each
> sclerite type, presumably representing muscular attachment. Two specimens
> revealing ontogenetic fusion of *Dailyatia *sclerites have been
> recovered. Based on all available evidence, a new reconstruction of the *Dailyatia
> *scleritome is proposed. In the reconstruction, a central row of A and
> paired B sclerites is flanked on both sides by one or two lateral rows of C
> sclerites. The exact number of sclerites may vary between species. This
> reconstruction is based on an assumed slug-like bodyplan and the *Dailyatia
> *animal is considered to be a vagrant, benthic animal living in and
> around archaeocyathan-microbial buildups and in other shallow water
> carbonate environments.
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> Copies are obtainable from:
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> Geological Society of Australia Incorporated
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