Silicified Early Devonian trilobites from Mudgee, New South Wales

Chatterton, Brian D. E.; Wright, Anthony J

doi:10.1080/03115518608619159

Cited by 19 publications

(16 citation statements)

References 13 publications

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“…2008, figs 9.1, 9.4). Yet another species, Laethoprusia brikelos from the upper Lochkovian–lower Pragian of Australia, lacks thoracic fenestrae but one of four pygidia illustrated has a single pair of fenestrae in the middle of the pleural region (Chatterton et al. 1979, pl.…”

Section: Fenestrae In Fenestraspis and Other Trilobitesmentioning

confidence: 99%

THE EXTRAORDINARY TRILOBITE FENESTRASPIS (DALMANITIDAE, SYNPHORIINAE) FROM THE LOWER DEVONIAN OF BOLIVIA

Holloway¹,

Carvalho²

2009

Palaeontology

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Abstract:The hitherto poorly known, monotypic trilobite genus Fenestraspis from the Lower Devonian of Bolivia is revised and its original assignment to the Synphoriinae supported. The thoracic morphology of the genus remains very poorly known. Fenestraspis is morphologically unusual because of the development of extensive fenestrae in the pleural region of the pygidium and apparently of the thorax; the presence of upwardly directed spines on the cephalon, thorax and pygidium; and the exceptionally large and highly elevated eyes with the palpebral rim projecting outwards above the visual surface. The function of the fenestrae remains uncertain. If they formed openings in the body of the trilobite in life they may have allowed circulation of oxygenated water to the limb exites so that respiration could have been maintained while the trilobite was enrolled. If they were covered with a flexible membrane, they may have been secondary respiratory structures or had a sensory function. The Synphoriinae is regarded as a subfamily of the Dalmanitidae rather than as an independent family of the Dalmanitoidea as proposed by some authors. The type species of the poorly known monotypic genus Dalmanitoides from the Lower Devonian of Argentina is illustrated photographically for the first time and compared with Fenestraspis.

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Section: Fenestrae In Fenestraspis and Other Trilobitesmentioning

confidence: 99%

THE EXTRAORDINARY TRILOBITE FENESTRASPIS (DALMANITIDAE, SYNPHORIINAE) FROM THE LOWER DEVONIAN OF BOLIVIA

Holloway¹,

Carvalho²

2009

Palaeontology

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“…Well‐preserved, silicified trilobite hypostomes of certain odontopleurids (Chatterton & Ludvigsen 1976; Chatterton & Perry 1983; Chatterton et al. 1997), lichids (Chatterton & Ludvigsen 1976; Chatterton et al. 1979), calymenids (Chatterton et al.…”

Section: Discussionmentioning

confidence: 99%

“…However, the morphology of certain trilobite hypostomes suggests that they may have possessed an atrium oris. Wellpreserved, silicified trilobite hypostomes of certain odontopleurids (Chatterton & Ludvigsen 1976;Chatterton & Perry 1983;Chatterton et al 1997), lichids (Chatterton & Ludvigsen 1976;Chatterton et al 1979), calymenids (Chatterton et al 1990), cheirurids (Chatterton & Ludvigsen 1976) and encrinurids (Edgecombe et al 1998), for example all have a significant dorsal doublure on the posterior margin of the hypostome. This may indicate that soft tissue attached to the hypostome significantly in front of the hypostomes' posterior margin.…”

Section: Discussionmentioning

confidence: 99%

The function of forks:Isotelus-type hypostomes and trilobite feeding

Hegna

2010

LET

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Hegna, T.A. 2010: The function of forks: Isotelus-type hypostomes and trilobite feeding. Lethaia, Vol. 43, Despite previous investigations, the function of the forked morphology of asaphid trilobite hypostomes is enigmatic. The focus of this study is the large and robust forked hypostome of the largest known genus of trilobite, Isotelus, and the independentlyderived forked hypostome of Hypodicranotus, the longest hypostome relative to body size of any trilobite. Although the trilobite hypostome is analogous to the labrum in other arthropods, forked hypostomes lack an obvious modern functional counterpart. The Isotelus hypostome is distinguished from other trilobite hypostomes by closely-spaced terrace ridges on a greatly thickened inner surface of the forked posterior margin, with the scarp of the terrace facing antero-ventrally. This is compatible with a grinding function, suggesting possible limb differentiation to complement this structure. The inner face of the tine (one of the two, prominent, sub-parallel posterior projections) is also unique in that it has a microstructure which is evident in section, running perpendicular to the surface. Macropredatory and filter-feeder roles are ruled out, and previous characterizations of the hypostome as knife-like or serrated are rejected. Its function is incompatible with that of other non-asaphid trilobites with forked hypostomes, like the remopleuridid Hypodicranotus, which lack similar terrace ridges and thickened inneredge cuticle. h Arthropoda, Asaphida, ecology, functional morphology, Trilobita.Thomas A. Hegna [thomas.hegna@yale.edu],

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“…(Talent, 1963: 106, pl.75, figs 1-6; pl.76, figs 1-8), Pragian; Phacops n.sp. B (Talent, 1963: pl.76, fig.1O), Pragian; Denckmannites rutherfordi Sherwin (1969) (Foerste, 1888); (Holloway & Neil, 1980;Talent, 1965), latest Pridolian to early Lochkovian; Reedops n.sp., Jell & Holloway (1983), Pridolian; Phacops (Phacops) sp., Chatterton & Wright (1986), Zlichovian; and Ananaspis ekphyma Wright in Jones et al (1986), Lochkovian. For the Late Silurian species, in particular, there is considerable disagreement concerning generic and subgeneric assignment (Sherwin, 1972;Campbell, 1976: fig.6); Strusz, fig.20 in Jenkins, 1986).…”

Section: --mentioning

confidence: 98%

A new Early Devonian spinose phacopid trilobite from Limekilns, New South Wales: morphology, affinities, taphonomy and palaeoenvironment

Wright¹,

Haas²

1990

Rec. Aust. Mus.

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nature culture discover Wright, A.J., & Haas, W., 1990. A new Early Devonian spinose phacopid trilobite from Limekilns, New South Wales: morphology, affinities, taphonomy and palaeoenvironment.ABSTRACT. Paciphacops (Paciphacops) crawfordae n.sp. is a distinctive spinose phacopid trilobite of late Pragian (Early Devonian) age from the deepwater, dysaerobic Rosedale Shale, Limekilns district, New South Wales. It is characterised by short occipital, genal and intergenal spines on the cephalon, and short thoracic spines on the axial rings and pleurae. Various combinations of such spines are developed in P. (Paciphacops) serratus Foerste (Lochkovian, New South Wales; Ludlovian, Kazakhstan?) and P. (Paciphacops) claviger Haas (Siegenian, Nevada), but the three species cannot be shown to be related.

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Silicified Early Devonian trilobites from Mudgee, New South Wales

Cited by 19 publications

References 13 publications

THE EXTRAORDINARY TRILOBITE FENESTRASPIS (DALMANITIDAE, SYNPHORIINAE) FROM THE LOWER DEVONIAN OF BOLIVIA

THE EXTRAORDINARY TRILOBITE FENESTRASPIS (DALMANITIDAE, SYNPHORIINAE) FROM THE LOWER DEVONIAN OF BOLIVIA

The function of forks:Isotelus-type hypostomes and trilobite feeding

A new Early Devonian spinose phacopid trilobite from Limekilns, New South Wales: morphology, affinities, taphonomy and palaeoenvironment

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