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Albardonia bifoliata

Albardonia bifoliata

Ernst & Carrera, 2022

GBIF:196202590

0year

ABOUT

Descriptions(5)

(Figs 8 G, H; 9 A-F; Appendix 1) urn: lsid: zoobank. org: act: 8 C 45367 C- 9280 - 4982 - A 6 C 2 - 9 E 757 EFFD 061
Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20
DESCRIPTION Bifoliate (frondose) colony starting from encrusting sheets. Fronds 0.70 - 1.30 mm in thickness. Encrusting sheets 0.66 - 1.31 mm thick. Secondary overgrowths occurring. Autozooecia budding from mesotheca, having angular shape of transverse section in endozone. Autozooecial apertures angular with rounded corners. Mesotheca 0.01 - 0.02 mm in thickness. Basal diaphragms common both in endozone and exozone, straight, or inclined. Mesozooecia abundant, 3 - 8 surrounding each autozooecial aperture, containing densely spaced diaphragms. Aktinotostyles moderately large, abundant, 5 - 7 surrounding each autozooecial aperture, originating in the outer exozone. Autozooecial walls granular, 0.010 - 0.015 mm thick, irregularly undulating in endozones; laminated, integrated with dark median lining, showing reversal V-shaped lamination, without cingulum, 0.02 - 0.05 mm thick in exozones. Maculae not observed. COMPARISON As for genus.
Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20
DIAGNOSIS. — As for genus.
Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20
ETYMOLOGY. — The species name refers to the bifoliate colony shape of the new species.
Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20
HOLOTYPE. — CEGH-UNC 27538 c. PARATYPES. — CEGH-UNC 27507 a, b, CEGH-UNC 27520 a, b, d, CEGH-UNC 27528 a, CEGH-UNC 27529 a, CEGH-UNC 27530 a, b, e, f, g, CEGH-UNC 27532 a, CEGH-UNC 27533 a, b, CEGH-UNC 27537 b, CEGH-UNC 27538 a, b, CEGH-UNC 27539 b, CEGH-UNC 27541 a (in total, 19 thin sections of 10 colonies). TYPE LOCALITY. — La Pola creek section near Albardon village, San Juan Province, Argentine Precordillera, western Argentina. TYPE HORIZON. — La Pola Formation, Upper Ordovician, Sandbian.
Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaBryozoaStenolaemataTrepostomatidaHeterotrypidaeAlbardoniaAlbardonia bifoliata

MULTIMEDIA

Media Files(2)

FIG. 8. — A-F, Heterotrypa enodis n. sp.: A-C, branch transverse section showing autozooecial chambers and mesozooecia, holotype CEGH-UNC 27504 b; D, branch longitudinal section showing autozooecial chambers with diaphragms and mesozooecia, CEGH-UNC 27504 a; E, F, tangential thin section showing autozooecial apertures,mesozooecia,and acanthostyles,CEGH-UNC 27504 c; G, H, Albardonia bifoliata n. gen., n. sp., oblique thin section through the bifoliate colony, holotype CEGH-UNC 27538 c. Scale bars: A, B, D, E, G, H, 1 mm; C, F, 0.2 mm.

Imageimage/png© Ernst, Andrej;Carrera, Marcelo G.Ernst, Andrej;Carrera, Marcelo G.

FIG. 9. — A-F, Albardonia bifoliata n. gen., n. sp.: A, B, tangential thin section showing autozooecial apertures, mesozooecia, and aktinotostyles, holotype CEGH-UNC 27538 c; C, D, longitudinal section showing autozooecial chambers with diaphragms and mesozooecia, paratype CEGH-UNC 27530 a; E, F, branch transverse thin section showing autozooecial chambers with diaphragms, mesozooecia, and mesotheca, paratype CEGH-UNC 27541 a; G, Diplotrypa sp. A, CEGH-UNC 27543 a, oblique thin section through the colony. Scale bars: A, C, E, 0.5 mm; B, D, 0.2 mm; F, 0.1 mm; G, 2 mm.

Imageimage/png© Ernst, Andrej;Carrera, Marcelo G.Ernst, Andrej;Carrera, Marcelo G.

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Source Information

A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera

checklist

This dataset contains the digitized treatments in Plazi based on the original journal article Ernst, Andrej, Carrera, Marcelo G. (2022): A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44 (20): 563-601, DOI: 10.5252/geodiversitas2022v44a20

ABSTRACT

Nineteen bryozoan species belonging to 18 genera are described from the La Pola Formation (Sandbian, Upper Ordovician) of Argentine Precordillera. Two trepostome genera each with one new species, respectively, are new: Albardonia bifoliata n. gen., n. sp. and Argentinopora robusta n. gen., n. sp. Five more species are new: a cystoporate Xenotrypa argentinensis n. sp., two trepostomes Heterotrypa enodis n. sp. and Nicholsonella spinigera n. sp., as well as two ptilodictyines Pseudostictoporella simplex n. sp. and Chazydictya ornata n. sp. The studied fauna shows some connection with Laurentia and Baltica on the species level and is similar to Siberia on the generic level. Furthermore, the generic composition of the La Pola fauna is similar to contemporary faunas of Las Aguaditas and Las Plantas formations of the Argentine Precordillera. The described fauna comes from mixed carbonate-siliciclastic deposits and represents a largely para-autochthonous association, with few autochthonous elements.The bryozoan growth forms indicate shallow shelf conditions. Bryozoans are associated with brachiopods, red algae, and echinoderms indicating heterozoan community typical for temperate to cool water environments with high primary production.

MOTS CLÉS

Ordovicien,

Sandbien,

environnement d’eau

froide,

Bryozoa,

paléogéographie,

paléoécologie,

genres nouveaux,

espèces nouvelles.

Ernst A, Carrera M G, admin (2022). A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas. Checklist dataset https://doi.org/10.15468/22hb3y accessed via GBIF.org on 2026-06-16.

CC0Published 6/16/2022View dataset
GBIF Usage Key
196202590
Dataset Key
f8f165f8-1b6b-4639-b139-c47e48485949
Origin
source
Backbone Key
11872935
Taxon ID
865C87FDFFADFFF139BBFB814F42FDBE.taxon
Last Crawled
6/9/2026
Last Interpreted
6/9/2026
View on GBIFSource Reference