Back to search
AnimaliaNot EvaluatedacceptedspeciesAccepted
Diplotrypa undefined-a

Diplotrypa undefined-a

GBIF:196202579

ABOUT

Descriptions(5)

(Fig. 9 G; 10 A-D; Appendix 1)
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 Massive colony, 6.2 - 6.4 mm in thickness, with indistinct endozone. Autozooecia growing from epitheca at high angles. Autozooecia in outer exozone often developing from mesozooecia. Autozooecial diaphragms common to rare, planar, curved proximally, irregularly spaced in autozooecia. Mesozooecia common, up to 3 surrounding each autozooecial aperture, bearing abundant straight diaphragms. Autozooecial walls fine fibrous microstructure, 0.005 - 0.010 mm thick in endozone and 0.02 - 0.03 mm thick in exozone. 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
Diplotrypa sp. A is similar to Diplotrypa catenulata Coryell, 1921 from the Sandbian of United States. Coryell [1921: 296] gave only the spacing of 4 - 4.5 apertures per 2 mm (distance from centre to centre 0.44 - 0.50 mm), which is more than double as large as the aperture spacing of the present material (average distance from centre to centre 0.22 mm). Size of apertures for Diplotrypa catenulata recorded by Astrova (1965: 185 - 186) from the Middle Ordovician of Arctic, was given as 0.42 - 0.75 mm (with macrozooecia of 0.9 - 1.0 mm width). Diplotrypa sp. A is similar to D. pusilla Astrova, 1965 from the Lower Ordovician of the Russian Arctic, but differs from it by less abundant diaphragms in autozooecia.
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. — La Pola Formation, Upper Ordovician, Sandbian; La Pola creek section near Albardon village, San Juan Province, Argentine Precordillera, western 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
MATERIAL EXAMINED. — Single colony (two thin sections) CEGH-UNC 27543 a, b.
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

Export occurrence data

Darwin Core Archive (ZIP)

CLASSIFICATION

Taxonomic Classification Tree

AnimaliaBryozoaStenolaemataTrepostomatidaDiplotrypidaeDiplotrypaDiplotrypa undefined-a

MULTIMEDIA

Media Files(2)

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.

FIG. 10. — A-D, Diplotrypa sp. A, CEGH-UNC 27543 a: A, B, longitudinal section showing autozooecial chambers with diaphragms and mesozooecia; C, D, tangential thin section showing autozooecial apertures and mesozooecia; E-G, Tarphophragma macrostoma (Loeblich, 1942), CEGH-UNC 27520 d: E, oblique section through the colony; F, longitudinal section showing autozooecial chambers and mesozooecia; G, tangential thin section showing autozooecial apertures and mesozooecia. Scale bars: A, E, 1 mm; B, C, F, G, 0.5 mm; D, 0.2 mm.

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

IMAGES

Gallery(2)

See Gallery →

Occurrences with images

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
196202579
Dataset Key
f8f165f8-1b6b-4639-b139-c47e48485949
Origin
source
Taxon ID
865C87FDFFB3FFF13B62F9C74BFAFCC0.taxon
Last Crawled
6/9/2026
Last Interpreted
6/9/2026
View on GBIFSource Reference