The ontogeny of cinctans (stem-group Echinodermata) as revealed by a new genus, Graciacystis, from the middle Cambrian of Spain

Samuel Zamora; Imran A. Rahman; Andrew B. Smith

doi:10.1111/j.1475-4983.2012.01207.x

The ontogeny of cinctans (stem-group Echinodermata) as revealed by a new genus, Graciacystis, from the middle Cambrian of Spain

Samuel Zamora^*, Imran A. Rahman, Andrew B. Smith

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

A new cinctan echinoderm, Graciacystis ambigua gen. et sp. nov. from Cambrian Series 3 rocks of Spain, is described based on more than 100 articulated specimens that range from 6 to 14.5mm in thecal length. This material shows that Graciacystis ambigua, while plastic in thecal shape, is highly conservative in its thecal construction, with a fixed number of marginal plates and very limited addition of plates in the stele and ventral membrane through ontogeny. Ventral swellings on marginal elements are absent from the smallest specimens and become gradually more marked during growth. A cladistic analysis shows Graciacystis to be a basal cinctan, more derived than Sotocinctus and the Trochocystitidae and as sister group to a large clade formed by Sucocystidae+Gyrocystidae. The determinate growth pattern seen in Graciacystis seems to be the general pattern for all cinctans.

Original language	English
Pages (from-to)	399-410
Number of pages	12
Journal	Palaeontology
Volume	56
Issue number	2
DOIs	https://doi.org/10.1111/j.1475-4983.2012.01207.x
Publication status	Published - 13 Mar 2013

Bibliographical note

accepted in revised form 4 September 2012

Keywords

Echinoderms
stem-group
ontogeny
phylogeny
cinctans
Cambrian

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10.1111/j.1475-4983.2012.01207.x

Zamora,%20Rahman,%20Smith,%20Palaeontology
"This is the peer reviewed version of the following article: The ontogeny of cinctans (stem-group Echinodermata) as revealed by a new genus, GraciaCystis, from the middle Cambrian of Spain, which has been published in final form at [10.1111/j.1475-4983.2012.01207.x]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."
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EchiEvoDevo: Investigating the assembly of an animal body plan: The early evolution of echinoderms - Imran Rahman transfer
Rahman, I. A., Donoghue, P. C. J., Smith, A. B. & Smith, P.
1/07/12 → 1/04/14
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@article{74b0b51bf30441db8b388e5896834a4d,

title = "The ontogeny of cinctans (stem-group Echinodermata) as revealed by a new genus, Graciacystis, from the middle Cambrian of Spain",

abstract = "A new cinctan echinoderm, Graciacystis ambigua gen. et sp. nov. from Cambrian Series 3 rocks of Spain, is described based on more than 100 articulated specimens that range from 6 to 14.5mm in thecal length. This material shows that Graciacystis ambigua, while plastic in thecal shape, is highly conservative in its thecal construction, with a fixed number of marginal plates and very limited addition of plates in the stele and ventral membrane through ontogeny. Ventral swellings on marginal elements are absent from the smallest specimens and become gradually more marked during growth. A cladistic analysis shows Graciacystis to be a basal cinctan, more derived than Sotocinctus and the Trochocystitidae and as sister group to a large clade formed by Sucocystidae+Gyrocystidae. The determinate growth pattern seen in Graciacystis seems to be the general pattern for all cinctans.",

keywords = "Echinoderms, stem-group, ontogeny, phylogeny, cinctans, Cambrian",

author = "Samuel Zamora and Rahman, {Imran A.} and Smith, {Andrew B.}",

note = "accepted in revised form 4 September 2012",

year = "2013",

month = mar,

day = "13",

doi = "10.1111/j.1475-4983.2012.01207.x",

language = "English",

volume = "56",

pages = "399--410",

journal = "Palaeontology",

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AU - Zamora, Samuel

AU - Rahman, Imran A.

AU - Smith, Andrew B.

N1 - accepted in revised form 4 September 2012

PY - 2013/3/13

Y1 - 2013/3/13

N2 - A new cinctan echinoderm, Graciacystis ambigua gen. et sp. nov. from Cambrian Series 3 rocks of Spain, is described based on more than 100 articulated specimens that range from 6 to 14.5mm in thecal length. This material shows that Graciacystis ambigua, while plastic in thecal shape, is highly conservative in its thecal construction, with a fixed number of marginal plates and very limited addition of plates in the stele and ventral membrane through ontogeny. Ventral swellings on marginal elements are absent from the smallest specimens and become gradually more marked during growth. A cladistic analysis shows Graciacystis to be a basal cinctan, more derived than Sotocinctus and the Trochocystitidae and as sister group to a large clade formed by Sucocystidae+Gyrocystidae. The determinate growth pattern seen in Graciacystis seems to be the general pattern for all cinctans.

AB - A new cinctan echinoderm, Graciacystis ambigua gen. et sp. nov. from Cambrian Series 3 rocks of Spain, is described based on more than 100 articulated specimens that range from 6 to 14.5mm in thecal length. This material shows that Graciacystis ambigua, while plastic in thecal shape, is highly conservative in its thecal construction, with a fixed number of marginal plates and very limited addition of plates in the stele and ventral membrane through ontogeny. Ventral swellings on marginal elements are absent from the smallest specimens and become gradually more marked during growth. A cladistic analysis shows Graciacystis to be a basal cinctan, more derived than Sotocinctus and the Trochocystitidae and as sister group to a large clade formed by Sucocystidae+Gyrocystidae. The determinate growth pattern seen in Graciacystis seems to be the general pattern for all cinctans.

KW - Echinoderms

KW - stem-group

KW - ontogeny

KW - phylogeny

KW - cinctans

KW - Cambrian

U2 - 10.1111/j.1475-4983.2012.01207.x

DO - 10.1111/j.1475-4983.2012.01207.x

M3 - Article (Academic Journal)

SN - 0031-0239

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SP - 399

EP - 410

JO - Palaeontology

JF - Palaeontology

IS - 2

ER -

The ontogeny of cinctans (stem-group Echinodermata) as revealed by a new genus, Graciacystis, from the middle Cambrian of Spain

Abstract

Bibliographical note

Keywords

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EchiEvoDevo: Investigating the assembly of an animal body plan: The early evolution of echinoderms - Imran Rahman transfer

Cite this