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Oswaldella erratum

Oswaldella erratum

Pena Cantero & Vervoort, 1997

GBIF:146019693

0year

ABOUT

Descriptions(4)

Ecology and distribution. Present material collected at depths between 689 and 720 m, with gonothecae in December. Oswaldella erratum was considered to have a West Antarctic distribution (Peña Cantero & Vervoort 2004 b; González Molinero & Peña Cantero 2015), however, our material, from East Antarctica, indicates a circum- Antarctic distribution.
Peña Cantero, Álvaro L., Marzal, Marina Fresneda (2018): Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Zootaxa 4441 (1): 121-136, DOI: 10.11646/zootaxa.4441.1.7
Description. Monosiphonic, unbranched stems, up to 80 mm high, not divided into internodes. Angle between cauline apophyses and stem c. 70 °. Cauline apophyses with two aXillary nematophores. First hydrocladial internode bifurcated with two similar prongs. Hydrotheca elongate (Fig. 3 I), not completely adnate, placed on middle of internode. Adcauline wall strongly curving at distal part. Hydrothecal aperture kidney-shaped, adcaudally directed. Mesial-inferior nematophore provided with a nematotheca.
Peña Cantero, Álvaro L., Marzal, Marina Fresneda (2018): Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Zootaxa 4441 (1): 121-136, DOI: 10.11646/zootaxa.4441.1.7
Oswaldella erratum — González Molinero & Peña Cantero, 2015: 435 (synonymy).
Peña Cantero, Álvaro L., Marzal, Marina Fresneda (2018): Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Zootaxa 4441 (1): 121-136, DOI: 10.11646/zootaxa.4441.1.7
Material examined. 38 EV 73, four stem fragments up to 80 mm high, with gonothecae (IK – 2009 – 0498).
Peña Cantero, Álvaro L., Marzal, Marina Fresneda (2018): Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Zootaxa 4441 (1): 121-136, DOI: 10.11646/zootaxa.4441.1.7

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaCnidariaHydrozoaLeptothecataKirchenpaueriidaeOswaldellaOswaldella erratum

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Media Files(1)

FIGURE 3. Staurotheca antarctica Hartlaub, 1904: A, hydrothecae. Staurotheca nonscripta Peña Cantero, Svoboda & Vervoort, 1997: B, hydrotheca. Staurotheca pachyclada (Jäderholm, 1904): C, hydrotheca. Antarctoscyphus spiralis (Hickson & Gravely, 1907): D, internode with hydrotheca showing intrathecal cusps (arrow). Symplectoscyphus glacialis (Jäderholm, 1904): E, internode with hydrotheca. Halecium interpolatum Ritchie, 1907: F, incipient stem with distal hydrotheca (arrow pointing to characteristic long and straight basal part of internode). Abietinella operculata (Jäderholm, 1903): G, hydrotheca (arrow pointing to disc-shaped operculum) and nematotheca (arrow). Schizotricha nana Peña Cantero, Svoboda & Vervoort, 1996: H, unforked hydrocladial internodes showing hydrothecae and nematothecae. Oswaldella erratum Peña Cantero & Vervoort, 1997: I, hydrocladial internode showing hydrotheca and mesial inferior nematotheca (arrow). Scale bars: 200 µm.

Imageimage/png© Peña Cantero, Álvaro L.;Marzal, Marina FresnedaPeña Cantero, Álvaro L.;Marzal, Marina Fresneda

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Source Information

Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica)

checklist

This dataset contains the digitized treatments in Plazi based on the original journal article Peña Cantero, Álvaro L., Marzal, Marina Fresneda (2018): Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Zootaxa 4441 (1): 121-136, DOI: 10.11646/zootaxa.4441.1.7

Abstract

Hydrozoans are one of the main and most characteristic zoological groups of Antarctic benthic communities, yet there are Antarctic areas where the hydrozoan fauna is completely unknown or scarcely known as off George V Coast (East Antarctica). Hitherto, only two studies have dealt with hydroids from this area and only 16 species have been reported. The present study contributes to increase knowledge of the benthic hydroid fauna off George V Coast by studying material collected during a sampling survey associated with the CEAMARC project. A total of 12 species of benthic hydroids were found. Anthoathecata is only represented by Bimeria corynopsis, the remaining species, including Schizotricha auroraaustralis sp. nov., belong to Leptothecata. Seven of the 12 species found in the study represent new records for the area; therefore, the number of benthic hydroids known off George V Coast is raised to 23. Staurotheca is the most speciose genus, represented by three species, followed by Schizotricha with two; the remaining genera are each represented by a single species. All species are restricted to Antarctic or Antarctic/sub-Antarctic waters. Nine species (75%) are endemic to the Antarctic region, most with a circum-Antarctic distribution (7 species); only two are endemic to East Antarctica. Three species are also distributed in sub-Antarctic waters.

Peña Cantero Á L, Marzal M F, plazi (2018). Benthic hydroids (Cnidaria: Hydrozoa) from off George V Coast (East Antarctica). Plazi.org taxonomic treatments database. Checklist dataset https://doi.org/10.11646/zootaxa.4441.1.7 accessed via GBIF.org on 2026-06-17.

CC0Published 6/26/2018View dataset
GBIF Usage Key
146019693
Dataset Key
0535eaeb-2e3b-4b6d-9ced-58a61fd02e03
Origin
source
Backbone Key
2267530
Taxon ID
03AC2855FF87FFB8E7FE7DB768A92BCB.taxon
Last Crawled
6/10/2026
Last Interpreted
6/10/2026
View on GBIFSource Reference