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AnimaliaNot EvaluatedacceptedspeciesAccepted
Microcheilinella affinis

Microcheilinella affinis

Polenova, 1955

GBIF:127639175

0year

ABOUT

Descriptions(4)

Description. Small ovoidal carapace. Overlap of the larger LV over the RV along whole outline, more pronounced ventrally than dorsally with a marked bow-shaped projection. Hmax at 2 / 3 posterior; Lmax slightly ventral; Wmax at 2 / 3 posterior. Well rounded dorsal and ventral margins. Dorsal and ventral margins almost symmetrical and clearly converging anteriorly, more slightly posteriorly. Posterior margin describing a large regular bow. Convex anterior margin, sharper than the posterior one. Posterior part of the carapace higher than anterior one. Surface smooth.
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. 1955 Microcheilinella affinis nov. sp.; Polenova: pl. 9, fig. 3. cf. 2013 Microcheilinella affinis Polenova; Maillet: 139, pl. XVIII, fig. 26. 2013 Microcheilinella cf. affinis Polenova; Maillet: 140, pl. XVIII, fig. 31. cf. 2013 Microcheilinella aff. affinis Polenova; Casier in Casier & Préat: 488, pl. V, fig. 6.
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. These specimens show a smaller carapace, with a more arched anterior margin, than the one of Microcheilinella affinis Polenova, 1955. Occurrences. Middle Givetian (Candás Fm, mbs A, B and C), 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. 17 specimens (14 C, 3 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

AnimaliaArthropodaOstracodaPodocopidaPachydomellidaeMicrocheilinellaMicrocheilinella affinis

Occurrences with images

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 2026-06-20.

CC0Published 12/31/2016View dataset
GBIF Usage Key
127639175
Dataset Key
b9c1e3a3-e591-4b34-9f30-d6d88a230673
Origin
source
Taxon ID
03B94C39E8614B5BFF22F898FB09FD74.taxon
Last Crawled
6/11/2026
Last Interpreted
6/11/2026
View on GBIFSource Reference