The genus Teliocrinus (Crinoidea, Echinodermata): a key taxon among pentacrinid stalked crinoids Author Roux, Michel Author Améziane, Nadia Author Eleaume, Marc text Zoological Journal of the Linnean Society 2009 2009-01-31 155 1 22 39 https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2008.00392.x journal article 5385 10.1111/j.1096-3642.2008.00392.x 1c8934f7-7c4c-4df8-bee8-ee00d0690b5a 0024-4082 4634981
Table 5. Comparison between the two diplocrinine genera and the three balanocrinine species, with respect to general ontogenetic trends
Hypalocrinus
Data from Carpenter (1884), Bourseau & Roux (1989), David (1998), and the present study. For stalk characters, only mature columnals or noditaxes were taken into account. Characters set in bold emphasize apomorphic character or the peramorphic pole of heterochronical development. Abbreviations: IPZ, interpetaloid zone; L d / L a, ratio of distal arm length with rudimentary pinnules to total arm length; Nb Cr, number of crenulae; Nb IN, number of internodals per noditaxis; PZ, petaloid zone; TS, transverse synarthry.
CharactersOntogenyNeocrinus decorusnaresianusNeocrinus blakeiTeliocrinusEndoxocrinus
IIBrax16–14 (78%)-162 (90%)-82 -4 (78%)1 -4 (54%)-61–2 (96%)-5
IIIBrax7–11 (60%)-7unknown1 (31%)-41 (43%)-42–3 (> 75%), 7
TS – IBr1 + 2Present orPresentPresentPresentAbsentAbsent
TS – IIBr1 + 2AbsentPresentPresentPresentPresentAbsent
Articulation at IIBr 3 + 4Synostosis to syzygySynostosisSynostosisSyzygy highlySyzygySyzygy less
differentiatedless differentiateddifferentiated
Symmorphy at IIBr 3 + 4Flat to deepNearly flatDeep withDeep withConcave withSlightly concave
sharp anglesharp angleraised centre
L d/ L a Nb IN0.33 to <0.13 1 to> 20Progressively 11–15, <20Progressively 8–14, <18Progressively 5, 7 (80%), 90.22–0.13 11, up to 16< 0.08 5– 32, < 57
Symplexial crenulae in IPZSeparated to verySeparated to lessSeparated toSeparated to verySeparated to veryUsually very
contiguouscontiguouscontiguouscontiguouscontiguouscontiguous
Inner crenulariumDevelopmentWell developedDevelopmentLess developedUsually restrictedUsually restricted
variable
Outer PZOpen to closedClosedClosedOpenOpenOpen
Shape of PZ aerolaLanceolate toPear-shapedPear-shaped toLanceolateLanceolateLanceolate
triangulartriangular