Conocrinus cahuzaci, Roux & Eléaume & Améziane, 2019
publication ID |
https://doi.org/ 10.11646/zootaxa.4560.1.3 |
publication LSID |
lsid:zoobank.org:pub:1057AA8B-9221-4045-99A5-8F0CC0F7395B |
DOI |
https://doi.org/10.5281/zenodo.5940619 |
persistent identifier |
https://treatment.plazi.org/id/913887B7-FFE7-FF9F-D098-FB67FDA4FB9A |
treatment provided by |
Plazi |
scientific name |
Conocrinus cahuzaci |
status |
sp. nov. |
Conocrinus cahuzaci n. sp.
Fig. 5 View FIGURE 5 I–K, Tables 5–6.
Synonymy. Tormocrinus (g) Roux et al. 2006: 267, table 1.
Etymology. Species dedicated to Bruno Cahuzac (University of Bordeaux), who collected a crinoid fauna (including the type series) that is more diversified than previously expected during his investigations of Eocene sediments in southwest France.
Type locality and type stratum. Miretrain quarry; dark grey marls C6a of Roux et al. (2006), Bartonian (base NP17) at Angoumé near Dax, southwest France .
Material. Four aboral cups, including the holotype (MNHN.F.A69935) and three paratypes (MNHN.F.A69936). Quantitative parameters are listed in Tables 5 and 6.
Diagnosis. Species with an abrupt enlargement of cup diameter at the level of basal/radial transition, five conspicuous and stout hypermorphic interradial processes, coarse and well-developed interradial ribs, ratio of central depression to radial ring diameter 0.44; arm articulatiom of muscular synarthry oval to semi-circular in inner position, ratio of arm socket to distal radial width 0.29.
Description of holotype and paratypes. Aboral cup of the holotype has an abrupt enlargement of diameter at the level of the presumed basal/radial transition, five conspicuous and stout hypermorphic interradial processes of equal size ( Fig. 5I View FIGURE 5 ), coarse and well-developed interradial ribs and a hemispherical central depression ( Fig. 5J View FIGURE 5 ); ratio of central depression to radial ring diameter 0.44; arm articulatiom of muscular synarthry, oval to semicircular in inner position regarding outer edge of the radial circlet ( Fig. 5K View FIGURE 5 ), ratio of arm socket to distal radial width 0.29. Two paratypes (A and C) with five shorter interradial processes of equal size, and the third (B) with one interradial process substantially longer than others.
Remarks. Cups of Conocrinus cahuzaci n. sp., one of the paratypes of C. duperrieri , C. thorenti and C. veronensis share a rounded to semi-circular arm socket in inner position. Conocrinus archiaci differs in having a trapezoidal socket adjacent to the outer edge of the radial circlet. Interradial processes are substantially less developed in C. duperrieri and C. thorenti .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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