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Chazydictya

Chazydictya

Ross, 1963

GBIF:196202568

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Descriptions(5)

COMPARISON
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. — Bifoliate lenticular, branched colonies. Branch transverse section lens-shaped. Autozooecia short, tubular, recumbent at their bases in endozone, bending sharply to colony surface, rectangular to subrhomboidal at their bases, becoming oval at branch surface, arranged in 8 to 15 regular alternating rows on branches. Hemisepta absent. Basal diaphragms rare to common. Mesotheca straight to weakly undulating, two-layered, without median rods. Autozooecial walls granular, in endozone; thick, finely laminated in exozone. Paurostyles in the laminated skeleton abundant, arranged in up to 5 rows between autozooecial apertures, rounded to weakly stellate in tangential section. Maculae absent.
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
Chazydictya Ross, 1963 differs from Ptilodictya Lonsdale, 1839 in absence of hemisepta and presence of abundant paurostyles.
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
OCCURRENCE. — Darriwilian, Ordovician; United States, Canada. Sandbian, Ordovician; Argentina.
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
TYPE SPECIES. — Chazydictya chazyensis Ross, 1963 by original designation. Darriwilian, Ordovician; New York, United States.
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

AnimaliaBryozoaStenolaemataCryptostomidaEscharoporidaeChazydictya

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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 2026-06-15.

CC0Published 6/16/2022View dataset
GBIF Usage Key
196202568
Dataset Key
f8f165f8-1b6b-4639-b139-c47e48485949
Origin
source
Backbone Key
4857265
Taxon ID
865C87FDFFBFFFFD3B28FEC24D50FC60.taxon
Last Crawled
6/9/2026
Last Interpreted
6/9/2026
View on GBIFSource Reference