Palaeoecology of the pseudoplanktonic Triassic crinoid Traumatocrinus from Southwest China

Hagdorn, Hans; Wang, Chuanshang

doi:10.1016/j.palaeo.2006.10.020

Cited by 24 publications

(30 citation statements)

References 13 publications

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“…Sedimentary structures are absent in this setting, thus there is no indication of bottom currents in the black mudstone and shale facies. Specimens of Traumatocrinus still attached to driftwood (Hagdorn, Wang, & Wang, 2006) prove a pseudoplanktonic mode of life for this species (Fig. 7), and the same lifestyle may be assumed for Vostocovacrinus.…”

Section: Encrinids From the Triassicmentioning

confidence: 59%

“…Traumatocrinus has a worldwide occurrence from upper Ladinian to lower Carnian (kristan-toLLmann & toLLmann, 1983;Hagdorn, Wang, & Wang, 2006). Articulated specimens that may belong to T. hsui mu are known from the Upper Triassic of southern China (mu, 1949;Hagdorn, 2001;Hagdorn, Wang, & Wang, 2006;Wang & others, 2008) and are from the lower Carnian Xiaowa Formation (formerly Falang Formation), exposed in Guanling County, Guizhou Province.…”

Section: Encrinids From the Triassicmentioning

confidence: 99%

“…Articulated specimens that may belong to T. hsui mu are known from the Upper Triassic of southern China (mu, 1949;Hagdorn, 2001;Hagdorn, Wang, & Wang, 2006;Wang & others, 2008) and are from the lower Carnian Xiaowa Formation (formerly Falang Formation), exposed in Guanling County, Guizhou Province. In the lower part of the Xiaowa Formation, Traumatocrinus colonies are preserved attached to driftwood at several stratigraphic levels in black mudstones and shales (Hagdorn, Wang, & Wang, 2006;Wang & others, 2008). The intact specimens occur with the crowns on their side or with splayed arms with the aboral side on the bedding plane (Fig.…”

Section: Encrinids From the Triassicmentioning

confidence: 99%

“…Thus, the column has numerous canals. Hagdorn, Wang, and Wang (2006) suggested that the tubuli contained fibers of mutable collagenous tissue that could stiffen or loosen the column, thereby resisting torsion and adjusting the crown to an optimum feeding position. In fact, columns of some individuals are embedded ropelike, whereas others resemble walking sticks with a bent proximal part near the crown ( Fig.…”

Section: Encrinids From the Triassicmentioning

confidence: 99%

“…9d ). A driftwood with a length of 330 cm and a diameter of 27 cm described by Hagdorn, Wang, and Wang (2006) contains approximately 60 intact crinoids with different column lengths, but the crowns are all of similar size (Fig. 7).…”

Section: Encrinids From the Triassicmentioning

confidence: 99%

See 4 more Smart Citations

Treatise Online, no. 16, Part T, Revised, Volume 1, Chapter 19: Paleoecology of pelagic crinoids

Heß¹

2011

TREON

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Section: Encrinids From the Triassicmentioning

confidence: 59%

Section: Encrinids From the Triassicmentioning

confidence: 99%

Section: Encrinids From the Triassicmentioning

confidence: 99%

Section: Encrinids From the Triassicmentioning

confidence: 99%

Section: Encrinids From the Triassicmentioning

confidence: 99%

See 3 more Smart Citations

Treatise Online, no. 16, Part T, Revised, Volume 1, Chapter 19: Paleoecology of pelagic crinoids

Heß¹

2011

TREON

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From benthic to pseudoplanktonic life: morphological remodeling of the Triassic crinoid Traumatocrinus and the Jurassic Seirocrinus during habitat change

Hagdorn¹

2016

PalZ

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Triassic: the crucial period of post-Palaeozoic crinoid diversification

Hagdorn¹

2010

Swiss J Palaeontol

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After their near-extinction around the end of the Permian, crinoids recovered during the Triassic and reoccupied almost all ecological niches they had held in Palaeozoic times. Triassic crinoids comprise 33 genera in 12 well-defined families and 5 orders of the subclass Articulata; the systematic position of 4 additional families is unknown. The highest diversity was before the Mid Carnian Wet Intermezzo that caused the extinction of the order Encrinida. Major morphologic changes were connected with the adaptation to various benthic habitats and to pseudoplanktonic and eleutherozoic modes of life. Convergently, the cups of Encrinida and Holocrinida-Isocrinida became cryptodicyclic with large muscular radial facets, arm numbers increased from 5 to more than 300, and the arms of Encrinida became gradually biserial. The Encrinida remained permanently fixed to hardgrounds and acted as frame builders in bioherms. By encrusting bivalve mudstickers some dadocrinids also became secondary soft bottom dwellers. The holocrinid stem evolved preformed rupture points at the lower nodal facets, allowing these crinoids to attach intermittently by cirri. The pseudoplanktonic traumatocrinids evolved extremely long, flexible stems with multiple pore systems and terminal root cirri. Paracomatulids and eocomatulids reduced their stems and adapted to an eleutherozoic mode of life. Somphocrinids miniaturized and remodeled their skeleton towards lightweight construction and adapted to a planktonic life style. After the Triassic no fundamentally novel adaptation was added. Crinoidal limestones, as common in the Palaeozoic, had their last appearance in Middle Triassic times.

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Palaeoecology of the pseudoplanktonic Triassic crinoid Traumatocrinus from Southwest China

Cited by 24 publications

References 13 publications

Treatise Online, no. 16, Part T, Revised, Volume 1, Chapter 19: Paleoecology of pelagic crinoids

Treatise Online, no. 16, Part T, Revised, Volume 1, Chapter 19: Paleoecology of pelagic crinoids

From benthic to pseudoplanktonic life: morphological remodeling of the Triassic crinoid Traumatocrinus and the Jurassic Seirocrinus during habitat change

Triassic: the crucial period of post-Palaeozoic crinoid diversification

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