Orithopsid crabs from the Lower Cretaceous Paja Formation in Boyacá (Colombia), and the earliest record of parasitic isopod traces in Raninoida

Luque, Javier; Cortés, Dirley; Rodriguez-Abaunza, Alejandra; Cárdenas, Diana M; Parra, Juan de Dios

doi:10.1016/j.cretres.2020.104602

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…[65,66] Studies of prey taxa have focused on gastropods [67,68] and their fossils as a proxy recording defensive evolutionary trends towards the end of the Mesozoic. [65,69] Fossil crab claws that appear specialized for crushing hard-shelled prey (e.g., with asymmetrical claws, "molariform" pro-trusions on the claw tips, and/or curved "teeth" on the proximal claw that aid in peeling open shells) [70] are first recorded from "mid" to Late Cretaceous deposits, [71][72][73][74][75] concurrent with the divergence [11] of eubrachyuran groups with known heavy shell predators such as xanthoids (Figure 2E) and portunoids during the so-called "Cretaceous Crab Revolution". [2] Upon closer examination, however, the hypothesis of claw morphology and predation ability on hard-shelled invertebrates as a major influence on the evolutionary success of crabs and their carcinized body plans is overstated.…”

Section: Escalation Of Predation Cannot Explain Early Crab Successmentioning

confidence: 99%

How to become a crab: Phenotypic constraints on a recurring body plan

2021

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A fundamental question in biology is whether phenotypes can be predicted by ecological or genomic rules. At least five cases of convergent evolution of the crab-like body plan (with a wide and flattened shape, and a bent abdomen) are known in decapod crustaceans, and have, for over 140 years, been known as "carcinization." The repeated loss of this body plan has been identified as "decarcinization." In reviewing the field, we offer phylogenetic strategies to include poorly known groups, and direct evidence from fossils, that will resolve the history of crab evolution and the degree of phenotypic variation within crabs. Proposed ecological advantages of the crab body are summarized into a hypothesis of phenotypic integration suggesting correlated evolution of the carapace shape and abdomen. Our premise provides fertile ground for future studies of the genomic and developmental basis, and the predictability, of the crab-like body form.

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Section: Escalation Of Predation Cannot Explain Early Crab Successmentioning

confidence: 99%

How to become a crab: Phenotypic constraints on a recurring body plan

2021

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“…These fossils include a large number of marine reptiles, such as plesiosaurs (Welles, 1962;Páramo-Fonseca et al, 2019), pliosaurs (Páramo-Fonseca et al, 2016, 2018Gómez-Pérez and Noè, 2017;Noè and Gómez-Pérez, 2022;), ichthyosaurs (Páramo-Fonseca, 1997;Maxwell et al, 2016;Páramo-Fonseca et al, 2020;Cortés et al, 2021), turtles (Cadena, 2015;Cadena and Parham, 2015;Cadena et al, 2019), crocodylomorphs (Cortés et al, 2019), and dinosaurs (Carballido et al, 2015;Cortés et al, 2023). Marine invertebrates are also widespread in the sedimentary sequence, particularly ammonoids (Etayo-Serna, 1968, 1979Patarroyo, 2000Patarroyo, , 2020 and orithopsid crabs (Luque et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

An Early Cretaceous Sphenophyllum or a hatchling turtle?

Palma-Castro,

Cómbita-Romero,

Cadena

et al. 2023

Palaeontol Electron

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Correctly identifying fossil specimens from parautochtonous deposits where marine and terrestrial organisms co-occur can be challenging due to the abundance of rare and obscure specimens with unclear morphologies. In this study, we reviewed fossils from the Lower Cretaceous La Paja Formation (Ricaurte Alto, Villa de Leyva, Colombia) that were originally described as the plant "Sphenophyllum colombianum" based on an apparent resemblance to the upper Paleozoic genus. We determined that the type specimen corresponds to the carapace of a hatchling turtle. In addition, a second specimen of "S. colombianum" although less well-preserved, also exhibits similar features of a hatchling turtle. The two fossil specimens are significant as they represent the first report of hatchling marine turtles from the Aptian of northwestern South America and provide evidence of the exceptional preservation of the Marine Reptile Lagerstätte of Ricaurte Alto.

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