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AnimaliaacceptedgenusAccepted
Knoxiella

Knoxiella

GBIF:127639228

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Descriptions(4)

Description. Medium-sized sub-oval carapace with straight dorsal margin. Hmax at 1 / 3 anterior; Lmax at 2 / 5 dorsal; Wmax at 1 / 3 anterior. Slightly convex ventral margin, posteriorly oblique. Ventral and dorsal margins almost parallel. Well rounded anterior and posterior margins, convex. Anterior part higher than posterior part. Flattened margins on the whole outline of the carapace. Overlap of the valves unknown. Surface smooth. Marked “ V ” - shaped adductorial sulcus slightly anterior and extending from dorsal margin to the centre of the valves. Preadductorial node is well visible.
Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel, Posada, Luis-Carlos Sánchez De (2016): Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Zootaxa 4068 (1): 1-78, DOI: 10.11646/zootaxa.4068.1.1
cf. 1982 Knoxiella sp. 1; Milhau: 20, pl. 3, figs. 49 – 50. cf. 1983 aKnoxiella sp. 1; Milhau: 351. cf. 1983 b Knoxiella sp. 1; Milhau: 221, 228 – 229, pl. 10, fig. 32. cf. 1988 Knoxiella sp. 1 Milhau; Milhau: 486, pl. 55, fig. 15. 2013 Knoxiella? sp. P 1; Maillet: 91, pl. XI, fig. 14.
Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel, Posada, Luis-Carlos Sánchez De (2016): Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Zootaxa 4068 (1): 1-78, DOI: 10.11646/zootaxa.4068.1.1
Discussion. This single depleted-ornamentation specimen reminds of Knoxiella sp. 1 reported by Milhau (1982, 1983 a, b, 1988) in the Ardenne and the Boulonnais. Occurrence. Middle Givetian (Candás Fm, mb B), Asturias (Peran-Perlora section).
Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel, Posada, Luis-Carlos Sánchez De (2016): Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Zootaxa 4068 (1): 1-78, DOI: 10.11646/zootaxa.4068.1.1
Material. 1 specimen (1 V).
Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel, Posada, Luis-Carlos Sánchez De (2016): Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Zootaxa 4068 (1): 1-78, DOI: 10.11646/zootaxa.4068.1.1

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaArthropodaOstracodaPalaeocopidaKloedenellidaeKnoxiella

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Source Information

Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications

checklist

This dataset contains the digitized treatments in Plazi based on the original journal article Maillet, Sebastien, Milhau, Bruno, Vreulx, Michel, Posada, Luis-Carlos Sánchez De (2016): Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Zootaxa 4068 (1): 1-78, DOI: 10.11646/zootaxa.4068.1.1

Abstract

Asturian ostracods of the Givetian carbonate Candás Formation are documented for the first time from the Peran-Perlora and Carranques reference sections. More than 1,200 specimens were extracted from 44 samples by means of the hot acetolysis method. In all, 75 taxa are described herein, of which 21 are formally described and one, Evlanella peranensis Maillet n. sp., is new. All the taxa are marine benthic and belong to the Eifelian Mega-Assemblage. The assemblages recognized are representative of semi-restricted to shallow open-marine palaeoenvironments above the storm wave base. The stratigraphical distribution of the taxa shows a strong faunal renewal in the top of the Candás Formation. Long-ranging taxa found at the base of the formation, of which many are known from the base of the Middle Devonian, disappear within the base of the member C and are replaced above, around the Middle/Upper Givetian boundary, by more cosmopolitan taxa characteristic of the Frasnian. The lower half of the member C is also characterized both by unstable environments and occurrence of some short-ranging opportunistic ostracod taxa. This renewal within shallow water ostracod communities is probably a consequence of the global Taghanic Biocrisis, leading world-widely to extinctions in several faunal groups. Faunal affinities with Givetian ostracod taxa reported in other areas of the world reflect the commonly accepted palaeogeographical patterns. Close relations between the Cantabrian Zone (NW-Spain), the Armorican Massif (W- France), the Mouthoumet Massif (S-France) and North Africa (Morocco and Algeria) suggest a narrow oceanic space between the western European terranes and the northern Gondwanan margin that involves an advanced phase of closure of the Medio-European Ocean.

Key words: Middle Devonian, new species, faunal renewal, systematic, Taghanic Biocrisis

Maillet S, Milhau B, Vreulx M, Posada L S D, plazi (2016). Givetian ostracods of the Candás Formation (Asturias, North-western Spain): taxonomy, stratigraphy, palaeoecology, relationship to global events and palaeogeographical implications. Plazi.org taxonomic treatments database. Checklist dataset https://doi.org/10.11646/zootaxa.4068.1.1 accessed via GBIF.org on 2026-06-18.

CC0Published 12/31/2016View dataset
GBIF Usage Key
127639228
Dataset Key
b9c1e3a3-e591-4b34-9f30-d6d88a230673
Origin
source
Backbone Key
4809295
Taxon ID
03B94C39E8524B6BFF22FDBFFB8AFB20.taxon
Last Crawled
6/11/2026
Last Interpreted
6/11/2026
View on GBIFSource Reference