The paradoxical ichnotaxonomy of Thalassinoides paradoxicus: a name of different meanings

Knaust, Dirk

doi:10.1007/s12542-020-00520-z

Cited by 17 publications

(10 citation statements)

References 23 publications

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“…The branching galleries conform to the morphology of the ichnogenus Thalassinoides, domichnial burrow systems usually attributed to decapod crustaceans burrowing in firmgrounds or softgrounds (17)(18)(19)(20).…”

Section: Resultsmentioning

confidence: 62%

Eocene animal trace fossils in 1.7-billion-year-old metaquartzites

Bengtson

Rasmussen

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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The Paleoproterozoic (1.7 Ga [billion years ago]) metasedimentary rocks of the Mount Barren Group in southwestern Australia contain burrows indistinguishable from ichnogenera Thalassinoides, Ophiomorpha, Teichichnus, and Taenidium, known from firmgrounds and softgrounds. The metamorphic fabric in the host rock is largely retained, and because the most resilient rocks in the sequence, the metaquartzites, are too hard for animal burrowing, the trace fossils have been interpreted as predating the last metamorphic event in the region. Since this event is dated at 1.2 Ga, this would bestow advanced animals an anomalously early age. We have studied the field relationships, petrographic fabric, and geochronology of the rocks and demonstrate that the burrowing took place during an Eocene transgression over a weathered regolith. At this time, the metaquartzites of the inundated surface had been weathered to friable sandstones or loose sands (arenized), allowing for animal burrowing. Subsequent to this event, there was a resilicification of the quartzites, filling the pore space with syntaxial quartz cement forming silcretes. Where the sand grains had not been dislocated during weathering, the metamorphic fabric was seemingly restored, and the rocks again assumed the appearance of hard metaquartzites impenetrable to animal burrowing.

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Section: Resultsmentioning

confidence: 62%

Eocene animal trace fossils in 1.7-billion-year-old metaquartzites

Bengtson

Rasmussen

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Cylindrichnus Toots in Howard, 57; Patagonichnus Olivero & López Cabrera, 97; Artichnus Zhang et al ., 139; Lamellaecylindrica Knaust, 70; Bromlichnus Vallon et al ., 128 (Fig. 1).…”

Section: Systematic Palaeoichnologymentioning

confidence: 99%

“…(After Knaust 70) Lamellaecylindrica with longitudinal striae (ornamentation) on the external surface.…”

Section: Systematic Palaeoichnologymentioning

confidence: 99%

“…Concentric, spiral and eccentrically laminated burrows are common elements of trace fossil associations, but their ichnotaxonomic assignment is often challenged due to variable morphology and transitional forms, for instance between branched and unbranched burrows. This particularly applies to burrows described as Rosselia Dahmer, 27; Cylindrichnus Toots in Howard, 57; Patagonichnus Olivero & López Cabrera, 97; Artichnus Zhang et al ., 139; Lamellaecylindrica Knaust, 70 and Bromlichnus Vallon et al ., 128. Nevertheless, proper identification and ichnotaxonomic description is crucial for their recognition and application to integrated palaeoenvironmental evaluations (Knaust & Bromley 71).…”

Section: Figmentioning

confidence: 99%

“…The erection of the ichnogenus Lamellaecylindrica became necessary to avoid confusion of this form with Thalassinoides paradoxicus Kennedy, 65. For discussion, see Knaust (70).…”

Section: Systematic Palaeoichnologymentioning

confidence: 99%

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Rosselichnidae ifam. nov.: burrows with concentric, spiral or eccentric lamination

Knaust

2021

Papers in Palaeontology

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Burrows with a thick concentric, spiral or eccentric lamination are common constituents of Phanerozoic marine deposits and have been described under different names for more than 150 years. Ambiguous original diagnoses, questionable type specimens and morphological transitions between end members have led to a rather unstable ichnotaxonomy and varying indistinct definitions. This situation, in turn, hinders an application of these ichnotaxa in facies interpretations, and in palaeoenvironmental and evolutionary reconstructions. A revision of this group of trace fossils, collectively assembled under the new ichnofamily Rosselichnidae, aims for its consolidation. It includes the ichnogenera Rosselia Dahmer, Cylindrichnus Toots in Howard, Patagonichnus Olivero & L opez Cabrera, Artichnus Zhang et al., Lamellaecylindrica Knaust and Bromlichnus Vallon et al., together containing 15 ichnospecies. Burrow morphology, orientation, branching and type of lamination are used as ichnotaxobases.Artichnus serialis isp. nov. is erected, whereas Rosselia erecta (Torell), Rosselia prolifera (Fournier et al.) and Lamellaecylindrica ludwigae (Schlirf) are new combinations. Rosselia erecta is installed as the ichnospecies name for forms that historically have been assigned to Monocraterion isp. A review of established interpretations of potential producers and their ethology of ichnotaxa included in Rosselichnidae reveals that polychaetes and holothurians with a suspension-and depositfeeding behaviour are best equipped to produce such burrows. The stratigraphic record of Rosselia spans the entire Phanerozoic, whereas the other ichnogenera mainly occur in the Mesozoic and Cenozoic.

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Balanoglossites-burrowed firmgrounds – The most common ichnofabric on earth?

Knaust

2021

Earth-Science Reviews

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The paradoxical ichnotaxonomy of Thalassinoides paradoxicus: a name of different meanings

Cited by 17 publications

References 23 publications

Eocene animal trace fossils in 1.7-billion-year-old metaquartzites

Eocene animal trace fossils in 1.7-billion-year-old metaquartzites

Rosselichnidae ifam. nov.: burrows with concentric, spiral or eccentric lamination

Balanoglossites-burrowed firmgrounds – The most common ichnofabric on earth?

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