The “Encrinurus” variolaris plexus (Trilobita, Silurian): Relationships of Llandovery species

Edgecombe, Gregory D.; Ramsköld, Lars

doi:10.1016/s0016-6995(96)80045-3

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…Silurian strata have been reported at the Hakubado locality, Izumi Village, Ohno County in the Kuzuryu Lake-Upper Ise river area of Fukui Prefecture (Ohno, Okazaki, & Hirano, 1977) and Kobayashi and Hamada (1987) reported 'Encrinurus cf. similis' that might suggest a Wenlock age similar to the Fukata Formation, where E. similis was first described (E. similis was synonymized with E. nodai from the same locality by Edgecombe & Ramsköld, 1996).…”

Section: Borderland Approximate Equivalence Between the Upper Hitoegmentioning

confidence: 99%

The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

et al. 2019

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Six major groups of trilobites from the Silurian and Devonian of Japan are evaluated for their paleobiogeographical signature. Silurian illaenids and scutelluids show four generic‐level and at least two species‐level links with the Australian segment of the Gondwana paleocontinent; encrinurids also indicate two generic‐level links with Australia and also the South China paleocontinent; whilst Devonian phacopids, and possibly proetids, suggest at least two generic‐level links with the North China paleocontinent. These different patterns may reflect the fragmentary biostratigraphical record of Japanese trilobites, but they also appear to reflect paleoenvironmental parameters associated with lithofacies, and paleoecology. Thus, Japanese assemblages of proetids and phacopids occurring in deep‐water clastic lithofacies have counterparts in similar settings in North China, and Japanese scutelluids and illaenids are strongly associated with shallow marine carbonate lithofacies that are similar to those of their occurrences in Australia. Japanese encrinurids occur in carbonate rocks indicative of shallow marine settings in the Kurosegawa Terrane, and they demonstrate a consistent paleobiogeographical affinity with Australia and South China. Larval ecology cannot be directly assessed for Japanese trilobite groups. However, proetids have consistently been shown to have planktonic protaspides, whereas illaenids, scutelluids, and encrinurids have benthic protaspides. Planktonic protaspides would have a greater propensity for distribution in ocean currents than benthic ones, and therefore may be of more limited paleobiogeographical utility. The combined data from the six different groups indicates that the complex paleobiogeographical patterns of the Japanese trilobite assemblages need to be interpreted with caution, and similarity of taxa does not necessarily denote paleogeographical proximity to other regions.

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Section: Borderland Approximate Equivalence Between the Upper Hitoegmentioning

confidence: 99%

The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

et al. 2019

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“…Easily the most profound change in trilobite paleobiology, and indeed in systematic biology in general, during the past 25 years has been the emergence and general acceptance of cladistic methodology, At the time of the Oslo meeting, Niles Eldredge (1972Eldredge ( , 1973 was the sole trilobite worker to embrace the nascent field of phylogenetic systematics. Nowadays, while still far from routine, cladistic parsimony analyses are commonplace (Adrain, 1998;Adrain and Chatterton, 1994;Edgecombe and Ramsköld, 1996;Hughes and Rushton, 1990;Lespérance and Desbiens, 1995;Lieberman, 1998;Ramsköld and Chatterton, 1991;Sundberg and McCollum, 1997), Cladistic approaches have been successfully applied to longstanding problems ranging from the species-level phylogenies of notoriously intractible families (Adrain and Edgecombe, 1997;Ramsköld and Werdelin, 1991;Westrop et aI., 1996) to the high-level classification of major trilobite groups (Fortey and Chatterton, 1988). Herein, Edgecombe and Ramsköld use the spectacular Early Cambrian fossils from China's Chengjiang lagerstätte in a cladistic analysis of perhaps the most basic phylogenetic issue in trilobite study-the systematic position of the trilobite clade and basal arachnomorph relationships.…”

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confidence: 99%

Trilobite paleobiology: Past, present, and future

Adrain

Westrop

1999

J. Paleontol.

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The first major international trilobite conference (which also dealt with related arthropod groups) was convened by David Bruton in Oslo in 1973. That meeting resulted in a 467 page proceedings volume (Martinsson, 1975) that has become an indispensible reference on arthropod paleobiology. With its abundance of high-quality empirical work and influential ideas, the ongoing utility of “Fossils and Strata 4” is assured, yet it is also a fascinating microcosm of the themes and concerns of paleontology as a whole a quarter of a century ago. Paleoecology blossomed in the late 1960s and early 1970s. Autecology, and particularly functional morphology, dominates the volume, accounting for about one-third of the contributions. Plate tectonics was a relatively recent development in 1973 and, following the lead of Whittington and Hughes (1972), several papers tackled trilobite paleobiogeography. They vary from a bold attempt to determine oceanic circulation through the Ordovician by Ross to more conventional studies of biogeographic distribution that were aimed at providing further support for concepts of continental drift. There was a burgeoning interest in community paleoecology, and Richard Fortey's (1975) now-classic paper on the Early Ordovician faunas of Spitsbergen was the first to define trilobite “communities.” The volume was rounded out by diverse papers on trilobite anatomy based on material from the Burgess Shale and Beecher's Trilobite Bed, the microstructure of the trilobite cuticle, trilobites eyes, high level classification of trilobites, and various evolutionary themes (character displacement in agnostoids; adaptive radiation in Cambrian trilobites).

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Cladistic Biogeography: Component-Based Methods and Paleontological Application

Ebach

Edgecombe

2001

Topics in Geobiology

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The “Encrinurus” variolaris plexus (Trilobita, Silurian): Relationships of Llandovery species

Cited by 8 publications

References 21 publications

The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan

Trilobite paleobiology: Past, present, and future

Cladistic Biogeography: Component-Based Methods and Paleontological Application

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