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Acorn Worms and Allies

Overview page. Subjects: Aquatic Biology.

Hemichordates are a minor phylum of marine invertebrates; they are not abundant and relatively few species are known. Yet they fascinate zoologists, displaying as they do...

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Aquatic Invertibrate, What is an?

Overview page. Subjects: Aquatic Biology.

What do crabs, sea urchins, earthworms, and corals have in common? Until recently, it was believed that these very diverse groups of animals had very few shared...

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Bichirs, Coelacanths, and Lungfishes

Overview page. Subjects: Aquatic Biology.

These three very distinct groups of fishes are grouped together here solely on the grounds that all are anachronistic – in other words, they all appear to belong to past ...

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Bonytongues and Allies

Overview page. Subjects: Aquatic Biology.

Essentially tropical freshwater fishes bonytongues, butterflyfish, mooneyes, featherbacks, and elephantnoses make up the diverse group known as osteoglossomorphs. Some...

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Bristlemouths and Allies

Overview page. Subjects: Aquatic Biology.

Bristlelike teeth, luminous organs, eyes on stalks – these are some of the characteristics of the order Stomiiformes, a worldwide group of deepsea fishes contained in four...

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Characins, Catfishes, Carps, and Allies

Overview page. Subjects: Aquatic Biology.

Carps, catfishes, characins, suckers, loaches, and their allies are the dominant freshwater fishes in Eurasia and North America and arguably so in Africa and South America....

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chimaera

Overview page. Subjects: Aquatic Biology.

A large, blunt head, an erectable spine in front of the first dorsal fin, and a gill cover over the four gills that leaves a single opening are some characteristics ...

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Codfishes, Anglerfishes, and Allies

Overview page. Subjects: Aquatic Biology.

The superorder Paracanthopterygii is probably best known for its great commercial importance, the codfishes and their allies being responsible for a huge proportion of the...

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Comb Jellies

Overview page. Subjects: Aquatic Biology.

Small, translucent, globular animals, comb jellies float through the open seas, like ghosts, capturing prey with their whiplike tentacles. The order name Ctenophora was derived...

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Echiurans

Overview page. Subjects: Aquatic Biology.

In common with the sipunculans and priapulans, echiurans are only really known to scientists – hence the lack of common names for these animals. They are wormlike but their...

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