Agnatha (/ ˈ æ ɡ n ə θ ə, æ ɡ ˈ n eɪ θ ə /; [3] from Ancient Greek ἀ-(a-) 'without' and γνάθος (gnáthos) 'jaws') is a paraphyletic infraphylum [4] of non-gnathostome vertebrates, or jawless …

2017年1月19日 · Class Agnatha (Jawless fish) General Characteristics: Predicted to be the first vertebrates -> oldest known fossils/most similar to lancets, tunicates. (~550 million years ago) …

2024年4月12日 · The Agnatha, meaning “without jaws,” is a superclass of jawless fish within the phylum Chordata and subphylum Vertebrata. It encompasses both living species, known as …

Muscular organ in the oral cavity that rasps through the body wall of the host to create seeming wounds for the lamprey to feed. Start studying Chapter 16: Agnatha (Jawless fishes). Learn …

Start studying Superclass Agnatha (jawless fish, vertebrates). Learn vocabulary, terms, and more with flashcards, games, and other study tools.

One of the most common agnatha characteristics is that they resemble the eels of today, with an elongated slimy body lacking scales and fins. Their cartilaginous skeleton lacks an occipital …

2015年6月3日 · Agnatha are distinguishable from the other craniates, or Gnathostomata, by what they lack: jaws, paired fins, vertebrae, a horizontal semicircular ear canal, and genital ducts.

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Agnatha ('without jaws') is a jawless fish superclass in the phylum Chordata, subphylum Vertebrata, that includes both living (cyclostomes) and extinct (conodonts and ostracoderms) …

2024年9月13日 · Agnatha is a superclass family of jawless vertebrate fish. That probably originated during the late Precambri­an or early Cambrian. This superclass is the source of the …