Late Late Cambrian Trilobites From Near Birch Inlet, South‐Western Tasmania

Bao, Jin-Song; Jago, James B.

doi:10.1111/1475-4983.00154

Cited by 21 publications

(9 citation statements)

References 9 publications

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“…L. trisectus from Nova Scotia should prove to record the uncompacted morphology of L. trisectus from Avalonian Britain, then L. "trisectus" as reported from Sweden (e.g., Westergård 1922, Rushton 2009) represents an undescribed species in the Peltura Zones; similar but minimally documented material from Siberia that has been identified as L. trisectus (e.g., Pegel 2000) is of uncertain status, as are poorly known occurrences of "L. trisectus-like" sclerites from the Argentine Cordillera (Shergold 1995) and Tasmania (Bao & Jago 2000).…”

Section: Biostratigraphymentioning

confidence: 99%

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Westrop¹,

Adrain²,

Landing³

2011

Bull. Geosci.

119

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Restudy of type and other material shows that the Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus americanus (Billings, 1860), far from being distributed globally, can be identified with confidence only at its type locality of Quebec. As such, it is ill-suited as an index for international correlation. Lotagnostus obscurus Palmer, 1955, from Nevada is not a synonym of L. americanus and is most similar to other effaced species from Australia. Sclerites from Avalonian Canada are represented by perhaps as many as two species, one of which is L. germanus (Matthew, 1901), and the other is similar to the type species, L. trisectus (Salter, 1864). However, loss of information due to compaction makes L. trisectus difficult to interpret in its type region of Avalonian Britain, and possible occurrences in other areas are therefore questionable at best. At the current state of knowledge, this species name should not be applied outside of Avalonian Britain. Aside from L. obscurus, which may possibly appear in slightly older strata, all Laurentian occurrences are confined to Upper Sunwaptan successions. Most are in the Illaenurus and Prosaukia pyrene zones, although review of material assigned to L. hedini (Troedsson, 1937) in western Newfoundland suggests that this species may occur, albeit questionably, only in the basal Skullrockian Phylacterus saylesi Fauna; indeterminate species occur in the Keithia schucherti Fauna in the latter region. Occurrences in Avalonian Canada are all from the upper Peltura Zone, and are likely somewhat younger (Saukiella junia Subzone and correlatives) than those in Laurentian successions

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Section: Biostratigraphymentioning

confidence: 99%

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Westrop¹,

Adrain²,

Landing³

2011

Bull. Geosci.

119

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“…Kobayashi, ; Harrington, ; Harrington and Leanza, ; Pribyl and Vanek, ), and China (Jiangshan and Changshan counties, Lu and Lin, ; West Hunan, Peng, ). In addition, the genus has been cited from southern Tasmania (Bao and Jago, ), Kazakhstan and Russia (Henningsmoen, ).…”

Section: Parabolinella Brøgger: Definition Distribution and Previoumentioning

confidence: 99%

“…Kobayashi, 1936Kobayashi, , 1937Harrington, 1938;Harrington and Leanza, 1957;Pribyl and Vanek, 1980), and China (Jiangshan and Changshan counties, Lu and Lin, 1984;West Hunan, Peng, 1991). In addition, the genus has been cited from southern Tasmania (Bao and Jago, 2000), Kazakhstan and Russia (Henningsmoen, 1957). Phylogenetic relationships among genera and species of Olenidae were conventionally established by the direct comparison of morphological features and the evaluation of stratigraphic placement.…”

Section: Parabolinella Brgger: Definition Distribution and Previousmentioning

confidence: 99%

Phylogenetic analysis of the late Cambrian–early Ordovician genus Parabolinella Brøgger (Trilobita, Olenidae)

Monti

Confalonieri

2012

Geological Journal

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Phylogenetic relationships among species of the family Olenidae (Trilobita, Ptychopariida) were traditionally established by the direct comparison of morphological features and the evaluation of stratigraphic placement. In this study, a cladistic analysis of Parabolinella Brøgger is conducted in order to test the supposed monophyly of the genus and to determine the relationships of its species. Twenty-one taxa (sixteen of this genus) from the late Cambrian and Tremadocian of Baltica, Avalonia, Laurentia, South China and the western margin of Gondwana were revised. Forty non-ordered characters were considered in the analysis, 34 belonging to the cephalon, four to the pygidium, and two to the thorax. Some of these characters were specially defined for this study. The phylogenetic analysis was performed under unweighted parsimony. The obtained tree is partially consistent with the stratigraphic record of the studied species and shows correspondence with global late Cambrian and early Ordovician palaeogeography. Parabolinella may have originated in deep water sites of the Oaxaca region, Mexico and then migrated to other regions. The genus diversified in outer shelf facies of the Baltica Province during the late Cambrian and Tremadocian, whereas it would have dispersed to the South China Province in early Tremadocian times.

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“…Charchaqia Troedsson, 1937 (= Aplotaspis Henderson, 1976; Bao and Jago, 2000), from the uppermost Cambrian of North America, China, Australia, and Tasmania (e.g., Troedsson, 1937; Taylor, 1976; Jago, 1991; Bao and Jago, 2000), is similar to the material described above in having an isopygous exoskeleton with low relief, a long and parallel sided glabella without lateral furrows, a tapered pygidial axis, and slight indications of two or three pygidial pleural furrows. Some species show, in addition, a proportionately wide, concave pygidial border.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Early Ordovician trilobites from the Iruya area (Cordillera Oriental, northwestern Argentina) and their stratigraphic significance

Tortello¹,

Esteban²

2016

J. Paleontol.

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The middle part of the Santa Rosita Formation (Tremadocian) is well exposed in the Iruya area, northwestern Argentina. At the Pantipampa and Rodeo Colorado localities, it is composed of shale and sandstone representing a wave-dominated shelf with influence of storm activity. Twenty-two trilobite species are described from these localities. Low-diversity assemblages from the lower part of the succession (Kainella meridionalis Kobayashi, Asaphellus catamarcensis Kobayashi, Leptoplastides marianus [Hoek]) are diagnostic of the early Tremadocian Kainella meridionalis Zone. Trilobites from the middle part of the sequence are much more diverse. Kainella teiichii Vaccari and Waisfeld, Gymnagnostus kobayashii n. sp., Conophrys sp. indet., Asaphellus clarksoni n. sp., A. stenorhachis (Harrington), A. isabelae Meroi Arcerito, Waisfeld and Balseiro, Ogygiocaris? iruyensis n. sp., Niobe (Niobella) inflecta (Harrington and Leanza) n. comb., Metayuepingia riccardii n. sp., Pseudokainella keideli Harrington, Apatokephalus rugosus n. sp., Onychopyge acenolazai n. sp., O. gonzalezae n. sp., Nileus cingolanii n. sp., N. erici n. sp., Leptoplastides marianus, Parabolinella sp. indet., Hapalopleura sp. indet., and Ceratopygidae gen. et sp. indet., occur at different levels of the Kainella teiichii Zone. This biostratigraphic unit includes the oldest records of Nileus Dalman and Ogygiocaris? Angelin; Metayuepingia Liu, Niobe (Niobella) Reed, and Onychopyge Harrington are here first reported from the Tremadocian of southwest Gondwana. Finally, the uppermost part of the succession is characterized by the absence of the genus Kainella Walcott and the occurrence of Bienvillia tetragonalis (Harrington), Asaphellus stenorhachis, Pseudokainella keideli and Leptoplastides sp. indet., which are indicative of the middle Tremadocian Bienvillia tetragonalis Zone. The trilobites described in this paper provide a basis for the refinement of correlations with other Lower Ordovician sections of the Cordillera Oriental. The genera recognized have their closest affinities with faunas from Scandinavia, Great Britain, and China.

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Late Late Cambrian Trilobites From Near Birch Inlet, South‐Western Tasmania

Cited by 21 publications

References 9 publications

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Phylogenetic analysis of the late Cambrian–early Ordovician genus Parabolinella Brøgger (Trilobita, Olenidae)

Early Ordovician trilobites from the Iruya area (Cordillera Oriental, northwestern Argentina) and their stratigraphic significance

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