First record of Dynomene (Brachyura, Dromioidea) from the Eocene of the Iberian Peninsula and remarks on the generic placement of Eoacantholobulus oscensis (Brachyura, Xanthoidea)

Ossó, Àlex; Domínguez, José Luis Belver; Angeli, Antonio De; Ferratges, Fernando A.

doi:10.1127/njgpa/2020/0874

Cited by 2 publications

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“…2014; Ossó & Domínguez 2017; Ossó et al . 2020). Although eubrachyurans have a rich fossil record extending back into the Early Cretaceous, it is during the Eocene that the oldest representatives of most extant families are first known (e.g.…”

Section: Figmentioning

confidence: 99%

The oldest dairoidid crab (Decapoda, Brachyura, Parthenopoidea) from the Eocene of Spain

Ferratges

Luque

Domínguez³

et al. 2023

Papers in Palaeontology

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Eubrachyurans, or ‘higher’ true crabs, are the most speciose group of decapod crustaceans and have a rich fossil record extending into the Early Cretaceous. However, most extant families are first found in the fossil record in the Palaeogene, and particularly in the Eocene. Unfortunately, fossils of many early eubrachyuran groups are often fragmentary, and only a few studies have combined extinct and extant taxa in a phylogenetic context using different optimality criteria. Here, we report the dairoidid crab Phrynolambrus sagittalis sp. nov., an enigmatic eubrachyuran from the upper Eocene of Huesca (northern Spain), whose completeness and exquisite preservation permit examination of its anatomy in a phylogenetic context. Dairoidids have previously been considered among the oldest stone crabs (Eriphioidea) or elbow crabs (Parthenopoidea), two disparate and distantly related groups of true crabs living today. Mechanical preparation and computed tomography of the fossil material revealed several diagnostic features that allow a detailed comparison with families across the crab tree of life, and test hypotheses about its phylogenetic affinities. Phrynolambrus sagittalis is the first record of the genus in the Iberian Peninsula, and represents one of the oldest crown parthenopoidean crabs worldwide, expanding our knowledge of the biogeographical distribution of elbow crabs during the Palaeogene, as well as their early origins, anatomical diversity and systematic affinities. Understanding the disparity of Eocene eubrachyurans is pivotal to disentangling the systematic relationships among crown families, and interpreting the spatio‐temporal patterns leading to the evolution of modern faunas.

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Section: Figmentioning

confidence: 99%

The oldest dairoidid crab (Decapoda, Brachyura, Parthenopoidea) from the Eocene of Spain

Ferratges

Luque

Domínguez³

et al. 2023

Papers in Palaeontology

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“…Decapod crustaceans studied in the present study come from lower Priabonian strata and were collected near the village of Fanlillo (Figure 1), in the municipality of Yebra de Basa (province of Huesca, Spain). This outcrop shows a great abundance and diversity of small benthic invertebrates including gastropods, bivalves, bryozoans, foraminifera, and decapod crustaceans Ossó et al, 2014;Domínguez and Ossó, 2016;Ossó and Domínguez, 2017;Ossó et al, 2020;Ferratges et al, 2023).…”

Section: Geological Settingmentioning

confidence: 99%

Spider crabs (Decapoda: Brachyura: Majoidea) from the upper Eocene of south Pyrenees (Huesca, Spain)

Ferratges

Dominguez²,

Ossó³

et al. 2023

Palaeontol Electron

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Majoidea are one of the most plesiomorphic clades of Eubrachyura and display a huge diversity in modern ecosystems. We describe one new fossil genus and three new species including Eoparanaxia eocenica n. gen. n. sp., Planobranchia elongata n. sp., Spinirostrimaia echinata n. sp.; and one indeterminate species tentatively assigned to Macrocheira sp. from the Pamplona Marls Formation (upper Eocene, southern Pyrenees, Spain). All of them are new or first reported from the Iberian Peninsula. This shows a highly diversified fauna associated with prodelta clays that favoured preservation of decapods and other invertebrates. Cluster analyses based on Jaccard and Raup-Crick coefficients of Eocene Majidae suggest close affinities of Iberia with other European basins.

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First record of Dynomene (Brachyura, Dromioidea) from the Eocene of the Iberian Peninsula and remarks on the generic placement of Eoacantholobulus oscensis (Brachyura, Xanthoidea)

Cited by 2 publications

References 0 publications

The oldest dairoidid crab (Decapoda, Brachyura, Parthenopoidea) from the Eocene of Spain

The oldest dairoidid crab (Decapoda, Brachyura, Parthenopoidea) from the Eocene of Spain

Spider crabs (Decapoda: Brachyura: Majoidea) from the upper Eocene of south Pyrenees (Huesca, Spain)

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