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aboral

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

Away from the mouth; on the opposite side of the body from the mouth in animals that lack clear-cut dorsal and ventral surfaces.

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Acanthodii

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived...

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Actinopterygii

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

; class Osteichthyes)

A subclass of ray-finned fish, that includes the majority of living bony fish of sea and fresh water. The fins are composed of a membranous web of skin...

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adoral

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

On the same side of the body as the mouth.

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Aegyptopithecus zeuxis

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

A genus and species of early catarrhine Primates, known from abundant remains, including several nearly complete skulls, from the early Oligocene of the Jebel al-Qatrani Formation, Fayum,...

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Aëtosauria

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

A mainly Triassic group of primitive Thecodontia (‘tooth- in-socket’) reptiles that resembled heavily armoured crocodiles and appear to have been specialized herbivores or possibly...

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Agnatha

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

(phylum Chordata, subphylum Vertebrata)

Superclass of jawless, fish-like vertebrates, with sucker-like mouths, including the extant lampreys, slime-eels and hagfish, and some of...

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Alfred Sherwood Romer

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

(1894–1973)

An American palaeontologist and comparative anatomist, who specialized in the evolution of vertebrates. He obtained his Ph.D. in 1921 from Columbia University, then...

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ambulacral

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

Applied to those areas of the body of an echinoderm (Echinodermata) that bear tube feet.

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Ambulocetus natans

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

The most completely known early cetacean (Cetacea), described in 1994 by J. G. M. Thewissen, S. T. Hussain, and M. Arif, from lower to middle Eocene beds in Pakistan. It is known by parts...

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