New hypotheses concerning the earliest brachyurans (Crustacea, Decapoda, Brachyura)

@article{Guinot2019NewHC,
  title={New hypotheses concerning the earliest brachyurans (Crustacea, Decapoda, Brachyura)},
  author={Dani{\`e}le Guinot},
  journal={Geodiversitas},
  year={2019},
  volume={41},
  pages={747 - 796}
}
  • D. Guinot
  • Published 14 November 2019
  • Geography
  • Geodiversitas
ABSTRACT All Jurassic brachyuran taxa known to date are based solely upon dorsal carapaces, and only a limited number of Early and mid-Cretaceous crabs retain ventral parts. Therefore, all Jurassic taxa and many forms from the first half of the Cretaceous are carapace-based entities. All of them are considered to be “dromiaceans”, podotremes to be precise. The recent discovery of an exceptionally well-preserved male crab from the Upper Cretaceous (lower Cenomanian) of Chiapas (Mexico… 
Origin, early evolution and palaeoecology of Gymnopleura (Crustacea, Decapoda): Basal palaeocorystoid crabs from the Upper Jurassic–Lower Cretaceous of central Europe
Abstract Recent fieldwork has yielded new decapod crustacean material from Upper Jurassic–lowest Cretaceous bioclastic limestones at Kotouc quarry near Stramberk (Moravia, northeastern Czech
Bajoprosopon piardi n. gen. and sp. from the Middle Jurassic of France, with a revised diagnosis of the family Prosopidae von Meyer, 1860 (Brachyura, Podotremata) and notes on the availability of names introduced by Hermann von Meyer (1835, 1857)
The earliest known brachyurans, or true crabs, are of Early and Middle Jurassic age. In general, they are rare and known from either a single or a few specimens only. Here we record a new genus and
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Abstract Four new brachyuran species, assigned to two new genera and one existing genus, are recorded from Lower and Upper Cretaceous strata of Moscow Oblast (Moskovskaya Oblast) and Dagestan,
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TLDR
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Eocarcinus praecursor Withers, 1932 (Malacostraca, Decapoda, Meiura) is a stem group brachyuran.
  • G. Scholtz
  • Medicine, Biology
    Arthropod structure & development
  • 2020
TLDR
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The Inachoididae spider crabs (Crustacea, Brachyura) from the Neogene of the tropical Americas
The spider crabs Willinachoides santanai n. gen. n. sp. from the early-middle Miocene of north Brazil and Paradasygyius rodriguezi n. sp. from the late Miocene of Venezuela are described and
First record of a homolid crab (Crustacea: Decapoda: Homoloidea) from the early Eocene of the Iberian Peninsula
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Shore crabs reveal novel evolutionary attributes of the mushroom body
TLDR
A major departure from this evolutionary trend is demonstrated in Brachyura, the most recent malacostracan lineage, where mushroom body calyces are buried deep within the lateral protocerebrum, with their columns extending outwards to an expansive system of gyri on the brain’s surface.
Shore crabs reveal novel evolutionary attributes of the mushroom body
TLDR
The organization amongst mushroom body neurons reaches extreme elaboration throughout its constituent neuropils in Brachyura, the most recent malacostracan lineage of crustacean lineages, and the calyces, columns, and especially the gyri show DC0 immunoreactivity, an indicator of extensive circuits involved in learning and memory.
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