Extinct genus of ground sloths
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Chasicobradys is an extinct genus of ground sloths of the family Nothrotheriidae that lived in what is now Argentina. "Chasicobradys" was discovered in the Arroyo Chasicó Formation, in Buenos Aires Province. It is only known from jaw fragments and teeth, which allowed the identification of this species, and was classified as a member of the nothrotheriid subfamily Nothrotheriinae, which comprises small to medium-sized species of ground sloths.
Etymology.
The genus name, "Chasicobradys", is derived from the Arroyo Chasicó Formation in Argentina and "bradys" meaning "slow". was found. The specific name means "intermediate".
Description.
"Chasicobradys" is a medium-sized species, similar in size to the Argentine species "Neohapalops rothi", characterized by a very high mandibular ramus and characteristics of its molariform teeth, such as the lack of a diastema between the first and second molars and the oblique location of the fourth molars.
"Chasicobradys" is one of the few sloths present in the Arroyo Chasicó Formation. Additional remains found in the area suggest the presence of other nothrotheriines along with a genus of megatheriid sloth, "Anisodontherium". The remains of these sloths show that at this time the nothrotheriids were already differentiated from the megatheriids and possessed the characteristics that would identify them in later times.
Palaeoecology.
The Arroyo Chasicó formation was, in the Miocene, on the tip of a peninsula bordered by the Paranaense Sea. "Chasicobradys" would have lived alongside various genera of Cingulata, including the last horned armadillo "Epipeltephilus", the Dasypodidae "Vetelia" and "Chasicotatus", the Euphractinae "Proeuphractus", the Glyptodontinae "Kelenkura" and the pampathere "Kraglievichia". Other xenarthrans includes several genera of ground sloths, such as the Mylodontidae "Octomylodon", the Megalonychidae "Protomegalonyx", the fellow Nothrotheriidae "Xyophorus", and the Megatheriidae "Anisodontherium". Several genera of rodents were recovered from the formation, such as the earliest genus of tuco-tucos, maras and capybaras such as "Cardiomys", "Procardiomys" and "Cardiatherium", Octodontidae such as "Chasicomys" and "Chasichimys", the Echimyidae "Pattersomys", the plain viscacha "Lagostomus telenkechanum" and its relative "Prolagostomus", and large-sized Dinomyidae like "Carlesia". Meridiungulates were also present in the formation, with Litopterna genera such as the Macraucheniidae "Cullinia" and "Paranauchenia" and the Proterotheriidae "Neobrachytherium", while notoungulates were represented by genera such as the large-sized late surviving Homalodotheriidae "Chasicotherium", the Toxodontidae "Paratrigodon", the Interatheriidae "Protypotherium", the Mesotheriidae "Typotheriopsis", and the Hegetotheriidae "Paedotherium", "Pseudohegetotherium" and "Hemihegetotherium".
The largest predators were the Sparassodonta "Pseudolycopsis cabrerai" and "Lycopsis viverensis", and the small terror bird "Psilopterus".
References.
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