Two early millericrinids and an unusual crinoid of uncertain systematic position from the lower Upper Anisian (Middle Triassic) of Qingyan, southwestern China

Stiller, Frank

doi:10.1017/s002233600003122x

Cited by 7 publications

(1 citation statement)

References 192 publications

(591 reference statements)

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“…nov. is rare. The new species co‐occurs with other benthic stalked crinoids of the families Encrinidae (order Encrinida; Stiller 1999), Bangtoupocrinidae (order Millericrinida; Stiller 2000), Qingyanocrinidae (order uncertain; Stiller 2000) and Holocrinidae (order Holocrinida).…”

Section: Palaeoecologymentioning

confidence: 92%

An early isocrinid sea lily from the middle to late Anisian boundary (Middle Triassic) of south‐west China – evidence for a far‐east Tethyan origin of the family Isocrinidae

Stiller¹

2011

Palaeontology

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The isocrinid sea lily Tyrolecrinus wugangi sp. nov. from uppermost middle to lowermost upper Anisian (lower Middle Triassic) strata of Leidapo near Qingyan, Guizhou Province, south-west China, provides new data on the early phylogeny of the order Isocrinida. The new species is the earliest unequivocal representative of the family Isocrinidae. It predates all other known species of the genus Tyrolecrinus that come from upper Ladinian to Rhaetian strata and also all other known taxa of the Isocrinidae. Nevertheless, its stem is of fully developed isocrinid type and is characteristic of the genus, with consistently synostosial, rarely cryptosymplectial, distal nodal articular facets. These findings indicate that the Isocrinidae evolved prior to the late middle Anisian in the far-eastern part of the Palaeotethys ocean, perhaps in the region forming today's south-west China, and spread to various other regions later in the Middle and Late Triassic. The genus Tyrolecrinus is revised and the new genus Bakonycrinus gen. nov. is erected.

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Section: Palaeoecologymentioning

confidence: 92%

An early isocrinid sea lily from the middle to late Anisian boundary (Middle Triassic) of south‐west China – evidence for a far‐east Tethyan origin of the family Isocrinidae

Stiller¹

2011

Palaeontology

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Evolutionary innovations in the fossil record: the intersection of ecology, development, and macroevolution

Jablonski

2005

J Exp Zool Pt B

100

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The origins of evolutionary innovations have been intensively studied, but relatively little is known about their large-scale ecological patterns. For post-Paleozoic benthic marine invertebrates, which have the richest and most densely sampled fossil record, order-level taxa tend to appear first in onshore, disturbed habitats, even in groups that are now exclusively deep-water (so that present-day distributions are not reliable indicators of original environments). New results presented here show that the onshore-origination pattern is robust to shifts in taxonomic methods and to new paleontological discoveries, and the few available studies suggest that this pattern can also be seen in terms of excursions in morphospace or the acquisition of derived character states, without reference to taxonomic categories. The environmental pattern at high levels contrasts significantly with the origin of low-level novelties (such as defined genera and families) in crinoids, echinoids, and bryozoans, where first appearances tend to conform to their clade-specific bathymetric diversity gradients. This discordance seems to eliminate potential driving mechanisms that simply scale up within-population genetic or ecological processes. Little is known about the factors that promote the onshore-offshore expansion of orders across the continental shelf, or that drive some clades to abandon ancestral habitats for an exclusively deep-water distribution. The origin of evolutionary innovation must ultimately reside in developmental changes, but the onshore-origination bias could emerge from two different dynamics: the pattern could be primarily genetic and developmental, i.e., innovations truly arise onshore; or primarily ecological, i.e., innovations arise randomly but preferentially survive onshore. Whatever the ultimate driving mechanisms, these macroevolutionary patterns show that theories of large-scale evolutionary novelty must include an ecological dimension.

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The earliest scientific descriptions of Chinese fossil echinoderms in a late nineteenth-century publication by Lajos Lóczy (Ludwig von Lóczy)

Stiller

Lin

2015

Palaeoworld

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Two early millericrinids and an unusual crinoid of uncertain systematic position from the lower Upper Anisian (Middle Triassic) of Qingyan, southwestern China

Cited by 7 publications

References 192 publications

An early isocrinid sea lily from the middle to late Anisian boundary (Middle Triassic) of south‐west China – evidence for a far‐east Tethyan origin of the family Isocrinidae

An early isocrinid sea lily from the middle to late Anisian boundary (Middle Triassic) of south‐west China – evidence for a far‐east Tethyan origin of the family Isocrinidae

Evolutionary innovations in the fossil record: the intersection of ecology, development, and macroevolution

The earliest scientific descriptions of Chinese fossil echinoderms in a late nineteenth-century publication by Lajos Lóczy (Ludwig von Lóczy)

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