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Compared to many other ostracoderms, such as the Heterostraci and Osteostraci, anaspids did not possess a bony shield or armor, hence their name.The anaspid head and body are instead covered in an array of small, weakly mineralized scales, with a row of massive scutes running down the back, and, at least confirmed among the birkeniids, the body was covered in rows of tile-like scales made of ...
Testudines (Turtles, tortoises & terrapins) An anapsid is an amniote whose skull lacks one or more skull openings (fenestra, or fossae) near the temples . [ 1 ] Traditionally, the Anapsida are considered the most primitive subclass of amniotes, the ancestral stock from which Synapsida and Diapsida evolved, making anapsids paraphyletic .
They are commonly and collectively known as the Tasmanian anaspid crustaceans. [2] Anaspidids have stalked eyes, long antennae and antennules, and a slender body with no carapace. The two species of Allanaspides [3] [4] and the single species of Paranaspides [5] are all listed as vulnerable on the IUCN Red List.
Pantestudines or Pan-Testudines is the proposed group of all reptiles more closely related to turtles than to any other living animal. It includes both modern turtles (crown group turtles, also known as Testudines) and all of their extinct relatives (also known as stem-turtles). [2] Pantestudines with a complete shell are placed in the clade ...
The clade consisting of Eunotosaurus and turtles was called Pan-Testudines (defined as all animals more closely related to turtles than to any other living group). More derived pan-testudines, such as the earliest turtle Odontochelys, have a plastron. [24] The following cladogram shows the phylogenetic position of the Eunotosaurus, from Ruta et ...
Euryapsids are usually considered entirely extinct, although turtles might be part of the sauropterygian clade [1] while other authors disagree. [2] Euryapsida may also be a synonym of Sauropterygia sensu lato. [3] The ichthyosaurian skull is sometimes described as having a metapsid (or parapsid) condition instead of a truly euryapsid one.
Cheloniidae (sea turtles) have found a solution to the problem of tetrapod swimming through the development of their forelimbs into flippers of high-aspect-ratio wing shape, with which they imitate a bird's propulsive mode more accurately than do the eagle-rays themselves. [citation needed] Immature Hawaiian green sea turtle in shallow waters ...
Pappochelys (παπποχέλυς [πάππος (grandfather) + χέλυς (turtle)] meaning "grandfather turtle" in Greek) is an extinct genus of diapsid reptile possibly related to turtles. The genus contains only one species, Pappochelys rosinae , from the Middle Triassic of Germany, which was named by paleontologists Rainer Schoch [ de ...