Orbignyella multitabulata Coryell, 1921

Ernst, Andrej & Carrera, Marcelo G., 2022, A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera, Geodiversitas 44 (20), pp. 563-601 : 572

publication ID

https://doi.org/ 10.5252/geodiversitas2022v44a20

publication LSID

urn:lsid:zoobank.org:pub:5EC74771-0B7B-494D-ADC8-79BECD097A3A

DOI

https://doi.org/10.5281/zenodo.6723055

persistent identifier

https://treatment.plazi.org/id/865C87FD-FFA9-FFEB-3AE1-FA674DBCFCBE

treatment provided by

Admin

scientific name

Orbignyella multitabulata Coryell, 1921
status

 

Orbignyella multitabulata Coryell, 1921 View in CoL

( Fig. 6 View FIG E-G; Appendix 1)

Orbignyella multitabulata Coryell, 1921: 284 View in CoL , pl. 5, figs 3-4.

MATERIAL EXAMINED. — CEGH-UNC 27505 a-c, CEGH-UNC 27518 a-c.

OCCURRENCE. — La Pola Formation, Upper Ordovician, Sandbian; La Pola creek section near Albardon village, San Juan Province, Argentine Precordillera, western Argentina. Pierce Limestone, Upper Ordovician (Sandbian); Tennessee, United States.

DESCRIPTION

Massive, subramose multilayered colonies. Secondary overgrowths common, 1-2 mm thick. Autozooecia bending gently from endozone, intersecting colony surface at right angles. Autozooecial apertures rounded to polygonal. Diaphragms in autozooecia common to abundant, straight to curved. Exilazooecia rare, polygonal in cross section, restricted to exozone. Acanthostyles common, moderately large, situated at junctions of autozooecial apertures. Autozooecial walls granular-prismatic, 0.005 -0.010 mm thick in endozone; irregularly thickened, finely laminated, displaying reverse V-structure in longitudinal section, 0.020 -0.033 mm thick in exozone. Maculae of macrozooecia 0.70-1.25 mm in diameter, spaced 1.9-2.0 mm from centre to centre.

COMPARISON

The present material is morphologically similar to Orbignyella multitabulata Coryell, 1921 from the Sandbian of United States. The only metric characteristic for O. multitabulata is the number of apertures per 2 mm given as 8-8.5 ( Coryell 1921: 284). Interpolated, it gives apertural spacing of c. 0.23-0.25 mm what overlaps the range in the present species (0.13-0.22 mm). The present material differs from Orbignyella wetherbyi ( Ulrich, 1890) from the Upper Ordovician of United States in smaller autozooecia (aperture width 0.11-0.19 mm vs 0.25-0.28 mm in O. wetherbyi ).

Kingdom

Animalia

Phylum

Bryozoa

Class

Stenolaemata

Order

Trepostomatida

Family

Atactotoechidae

Genus

Orbignyella

Loc

Orbignyella multitabulata Coryell, 1921

Ernst, Andrej & Carrera, Marcelo G. 2022
2022
Loc

Orbignyella multitabulata

CORYELL H. N. 1921: 284
1921
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