Saaremaacrinus, Ausich & Wilson & Vinn, 2012
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publication ID |
https://doi.org/ 10.4202/app.2010.0094 |
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persistent identifier |
https://treatment.plazi.org/id/BF03720D-FFCC-FFF0-BC7D-FE1B23ACFAC8 |
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treatment provided by |
Felipe |
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scientific name |
Saaremaacrinus |
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Genus Saaremaacrinus nov.
Etymology: Named for the island of Saaremaa.
Type species: Saaremaacrinus estoniensis gen. et sp. nov., by monotypy.
Diagnosis.—Calyx shape medium bowl, basal concavity absent, no calyx lobation. Calyx plates thick, broad median ray ridges present. Basal plate circlet relatively high. Radial plates higher than wide, orientation of radials subvertical, radial circlet only open in CD interray, fixed first primibrachial wider than high, axillary second primibrachial pentagonal. Fixed brachials divide isotomously, fixed rays symmetrical, highest fixed brachials fifth secundibrachial. Numerous interradial plates, regular interray plating in an alternating biseries, normal interrays not depressed. CD interray proximal plating P−3, anitaxial ridge present, CD interray wider than regular interrays. Tegmen low, tegmen robust, tegmen slightly depressed interradially. Ambulacral and orals not differentiated on tegmen, anal tube absent, anus positioned slightly eccentrically. (Characters of the free arms, and presence or absence of the goniopores unknown.)
Description.—See species description below.
Discussion.—Relationships of Saaremaacrinus gen. nov. to other Silurian periechocrinids is described in the discussion of the family, above.
Geographic and stratigraphic range.—Pridoli, Late Silurian, Estonia.
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