A new Triassic decapod, Platykotta akaina, from the Arabian shelf of the northern United Arab Emirates: earliest occurrence of the Anomura

Chablais, Jérôme; Feldmann, Rodney M.; Schweitzer, Carrie E.

doi:10.1007/s12542-010-0080-y

Cited by 22 publications

(17 citation statements)

References 19 publications

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“…Our results suggest these superfamily clades were derived from a squat-lobster-like ancestor approximately ~205 MYA (Figures 3A and 4). Interestingly, our divergence time and character reconstruction analyses (Figures 3A and 4) are consistent with fossil evidence, and more specifically, the discovery of Platykotta akaina , the oldest known anomuran fossil [1]. Platykotta akaina, with a possibly squat-lobster-like body form, dates back to the Late Triassic (~201.6-228 MYA) and has strong morphological affinity with the superfamilies Chirostyloidea and Galatheoidea.…”

Section: Discussionsupporting

confidence: 82%

“…Platykotta akaina, with a possibly squat-lobster-like body form, dates back to the Late Triassic (~201.6-228 MYA) and has strong morphological affinity with the superfamilies Chirostyloidea and Galatheoidea. This fossil was found as part of a biotic assemblage suggesting that Platykotta akaina thrived in tropical-subtropical waters and lived in the subtidal with connections to the open ocean [1,65]. …”

Section: Discussionmentioning

confidence: 99%

“…The fossil record contains representatives of nearly all extant families and spans the Norian/Rhaetian (Late Triassic) [1] to Holocene. Anomurans have colonized a wide variety of ecosystems including freshwater, anchialine cave, terrestrial and hydrothermal vent habitats, and are distributed from the ocean’s surface to depths more than 5000 m [2].…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda)

et al. 2013

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BackgroundThe infraorder Anomura has long captivated the attention of evolutionary biologists due to its impressive morphological diversity and ecological adaptations. To date, 2500 extant species have been described but phylogenetic relationships at high taxonomic levels remain unresolved. Here, we reconstruct the evolutionary history—phylogeny, divergence times, character evolution and diversification—of this speciose clade. For this purpose, we sequenced two mitochondrial (16S and 12S) and three nuclear (H3, 18S and 28S) markers for 19 of the 20 extant families, using traditional Sanger and next-generation 454 sequencing methods. Molecular data were combined with 156 morphological characters in order to estimate the largest anomuran phylogeny to date. The anomuran fossil record allowed us to incorporate 31 fossils for divergence time analyses.ResultsOur best phylogenetic hypothesis (morphological + molecular data) supports most anomuran superfamilies and families as monophyletic. However, three families and eleven genera are recovered as para- and polyphyletic. Divergence time analysis dates the origin of Anomura to the Late Permian ~259 (224–296) MYA with many of the present day families radiating during the Jurassic and Early Cretaceous. Ancestral state reconstruction suggests that carcinization occurred independently 3 times within the group. The invasion of freshwater and terrestrial environments both occurred between the Late Cretaceous and Tertiary. Diversification analyses found the speciation rate to be low across Anomura, and we identify 2 major changes in the tempo of diversification; the most significant at the base of a clade that includes the squat-lobster family Chirostylidae.ConclusionsOur findings are compared against current classifications and previous hypotheses of anomuran relationships. Many families and genera appear to be poly- or paraphyletic suggesting a need for further taxonomic revisions at these levels. A divergence time analysis provides key insights into the origins of major lineages and events and the timing of morphological (body form) and ecological (habitat) transitions. Living anomuran biodiversity is the product of 2 major changes in the tempo of diversification; our initial insights suggest that the acquisition of a crab-like form did not act as a key innovation.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda)

et al. 2013

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“…

(1) Platykotta akaina (Platykottidae) of Norian–Rhaetian age, 199.6–216.5 Ma. Earliest appearance of an anomuran in the fossil record [27].

(2) Juracrista perculta (Munididae) of Tithonian age, 145.5–150.8 Ma.

…”

Section: Methodsmentioning

confidence: 99%

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

et al. 2013

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The phylogeny of the superfamily Chirostyloidea (Decapoda: Anomura) has been poorly understood owing to limited taxon sampling and discordance between different genes. We present a nine-gene dataset across 15 chirostyloids, including all known yeti crabs (Kiwaidae), to improve the resolution of phylogenetic affinities within and between the different families, and to date key divergences using fossil calibrations. This study supports the monophyly of Chirostyloidea and, within this, a basal split between Eumunididae and a Kiwaidae–Chirostylidae clade. All three families originated in the Mid-Cretaceous, but extant kiwaids and most chirostylids radiated from the Eocene onwards. Within Kiwaidae, the basal split between the seep-endemic Kiwa puravida and a vent clade comprising Kiwa hirsuta and Kiwa spp. found on the East Scotia and Southwest Indian ridges is compatible with a hypothesized seep-to-vent evolutionary trajectory. A divergence date estimate of 13.4–25.9 Ma between the Pacific and non-Pacific lineages is consistent with Kiwaidae spreading into the Atlantic sector of the Southern Ocean via the newly opened Drake Passage. The recent radiation of Kiwaidae adds to the list of chemosynthetic fauna that appear to have diversified after the Palaeocene/Eocene Thermal Maximum, a period of possibly widespread anoxia/dysoxia in deep-sea basins.

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“…Firstly, during the Late Jurassic already a substantial di− versity in carapace morphology is documented, with members of the families Diogenidae, Parapylochelidae, and Pylocheli− dae (and possibly Parapaguridae) being represented. The dio− genids (one genus) reveal an evolutionary novelty in that an acute, V−shaped branchiocardiac and a subcircular cervical groove (as seen in the Triassic anomuran Platykotta Chablais, Feldmann, and Schweitzer, 2010) becomes fused to a single, sinuous groove (i.e., cervical groove) (Fraaije et al 2012b). …”

Section: Remarks On Paguroid Evolutionmentioning

confidence: 99%

New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification

Fraaije

Krzemiński

Bakel

et al. 2012

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A new Triassic decapod, Platykotta akaina, from the Arabian shelf of the northern United Arab Emirates: earliest occurrence of the Anomura

Cited by 22 publications

References 19 publications

A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda)

A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda)

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification

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