advertisement
WikiVisually
Infinite photos and videos for every Wiki article · Find something interesting to watch in seconds
Wonders of Nature Animals Celebrities World Banknotes Tallest Buildings Great Artists Presidents Recovered Treasures Crown Jewels Great Cities Famous Castles Kings of France Largest Palaces Ancient Marvels Wars and Battles Rare Coins Richest US Counties History by Country Sports Best Campuses Great Museums Supercars British Monarchs Countries of the World Orders and Medals Largest Empires
more top lists
History
Agnatha
Videos
Page
Agnatha is an infraphylum of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct species. Among recent animals, cyclostomes are sister to all vertebrates with jaws, known as gnathostomes.
Agnatha
Agnatha
Image: Eptatretus hexatrema 15727711
Image: Eptatretus hexatrema 15727711
Image: Pacific lamprey facing right
Image: Pacific lamprey facing right
Image: Thyestes verrucosus 22DB
Image: Thyestes verrucosus 22DB
Chordate
Videos
Page
A chordate is a deuterostomic animal belonging to the phylum Chordata. All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa. These five synapomorphies are a notochord, a hollow dorsal nerve cord, an endostyle or thyroid, pharyngeal slits, and a post-anal tail. The name "chordate" comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate body plan structuring and movements. Chordates are also bilaterally symmetric, have a coelom, possess a closed circulatory system, and exhibit metameric segmentation.
The glass catfish (Kryptopterus vitreolus) is one of the few chordates with a visible backbone. The spinal cord is housed within its backbone.
The glass catfish (Kryptopterus vitreolus) is one of the few chordates with a visible backbone. The spinal cord is housed within its backbone.
Cephalochordate: lancelet. Pictured species: Branchiostoma lanceolatum
Cephalochordate: lancelet. Pictured species: Branchiostoma lanceolatum
Tunicates: sea squirts
Tunicates: sea squirts
A skeleton of the blue whale, the largest animal, extant or extinct, ever discovered. Mounted outside the Long Marine Laboratory at the University of
A skeleton of the blue whale, the largest animal, extant or extinct, ever discovered. Mounted outside the Long Marine Laboratory at the University of California, Santa Cruz. The largest blue whale ever reliably recorded measured 98ft (30m) long.