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Earth Sciences and Geography x Zoology and Animal Sciences x clear all

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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Agassiz, Louis

Edward Lurie.

in American National Biography Online

January 1999; p ublished online February 2000 .

Reference Entry. Subjects: Zoology and Animal Sciences; Geology and the Lithosphere. 2837 words.

Agassiz, Louis (26 May 1807–14 December 1873), zoologist and geologist, was born Jean Louis Rodolphe Agassiz in Motier, Switzerland, the son of Rodolphe Agassiz, a Protestant pastor, and...

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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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