29.2 Fishes - Biology 2e | OpenStax
We should note, however, that the "ostracoderms" represent an assemblage of heavily armored extinct jawless fishes that may not form a natural evolutionary group. Fossils of the genus Haikouichthys from China, with an age of about 530 million years, show many typical vertebrate characteristics including paired eyes, auditory capsules, and ...
Placodermi - Wikipedia
Placodermi (from the Greek πλάξ = plate and δέρμα = skin, literally "plate-skinned") is a class of armoured prehistoric fish, known from fossils, which lived from the Silurian to the end of the Devonian period. Their head and thorax were covered by articulated armoured plates and the rest of the body was scaled or naked, depending on the species. ...
Biology 172 section 7: The Craniates Flashcards | Quizlet
Ostracoderm. An extinct jawless fish of the Cambrian to Devonian periods, having a heavily armored body. ... A structure that closes or covers an aperture, in particular. ... having a heavily armored body. Pectoral girdle (in vertebrates) the skeletal framework that provides attachment for the forelimbs or pectoral fins, usually consisting of ...
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2.2 Early Fish Types & Anatomy - Part 1 - Learning to Swim ...
Land plants didn't evolve until later in the Silurian Period. In these shallow equatorial seas, a large diverse and widespread group of armored, jawless fishes evolved: the Pteraspidomorphi. The first of our three groups of ostracoderms. The Pteraspidomorphi are divided into three major groups: the Astraspida, the Arandaspida and the Heterostraci.
Ostracoderm | vertebrate group | Britannica
Ostracoderm, an archaic and informal term for a member of the group of armoured, jawless, fishlike vertebrates that emerged during the early part of the Paleozoic Era (542–251 million years ago). Ostracoderms include both extinct groups, such as the heterostracans and osteostracans, and living forms, such as hagfishes and lampreys.
Exam II Vertebrate Zoology Flashcards | Quizlet
Start studying Exam II Vertebrate Zoology. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
2.1 Our Fish-like Ancestors - Learning to Swim | Coursera
To learn more about the vertebrate body plan, and how it evolved from that of its soft-bodied ancestors, we have to turn to the extinct, armored agnathans, the ostracoderms. We'll be examining the features of three major groups of ostracoderms in this lesson. They're called the Pteraspidomorphi, the Thelodonti, and the Osteostraci.
Use armoured in a sentence | armoured sentence examples
As to the number of vessels, which fluctuates from month to month, little can be said that is wholly accurate at any given moment, but, very roughly, the French navy in 1909 included 25 battleships, 7 coast defence ironclads, 19 armoured cruisers, 36 protected cruisers, 22 s1oops, gunboats, &c., 45 destroyers, 319 torpedo boats, 71 submersibles and submarines and 8 auxiliary cruisers.
GEOL 102 The Middle Paleozoic Era II: The Conquest of Land
"Ostracoderms": Armored jawless fish A grade, not a clade) Front ends generally heavily mineralized, rears covered with smaller scales Mostly sediment feeders "Placoderms": Jawed fish Typically did not have teeth, but instead a ridge of bone for cutting (a few have some teeth)
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Vertebrates class
Oct 19, 2017· • Gr. Ostrakon, shell; derma, skin • Palaeozoic, world's first vertebrates • Their body form was fishlike, usually flattened dorso-ventrally with huge head and gill region • No jaws, pectoral or pelvic fins but had only median fins • Their body were very bony and heavily armoured.
Ostracoderm - definition of ostracoderm by The Free Dictionary
Define ostracoderm. ostracoderm synonyms, ostracoderm pronunciation, ostracoderm translation, English dictionary definition of ostracoderm. n. Any of various extinct primitive jawless fishes of the Ordovician through the Devonian periods, having bodies encased in an armor of bony plates. ... ostracoderm - extinct fish-like jawless vertebrate ...
Agnatha - Wikipedia
Agnatha (Ancient Greek ἀ-γνάθος "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species.The group is sister to all vertebrates with jaws, known as gnathostomes.. Recent molecular data, both from rRNA and from mtDNA as well as embryological data strongly supports ...
microRNAs revive old views about jawless vertebrate ...
Nov 09, 2010· Interestingly, this echoes the opinion expressed long ago by some paleontologists, who supported the theory that lampreys and hagfishes were derived from heavily armored and ossified Paleozoic jawless fishes referred to as ostracoderms, such as heterostracans or osteostracans (Fig. 1), but are now regarded as stem gnathostomes (14, 15); that ...
GEOL 102 The Middle Paleozoic: The Silurian & Devonian
Jan 13, 2020· "Ostracoderms": Armored jawless fish A grade, not a clade) Front ends generally heavily mineralized, rears covered with smaller scales Mostly sediment feeders "Placoderms": Jawed fish Typically did not have teeth, but instead a ridge of bone for cutting (a few have some teeth)
Placoderms: Salient Features and Classification | Fish ...
In this article we will discuss about:- 1. Introduction to Placoderms 2. Time and Place of Origin of Placoderms 3. Salient Features 4. Classification 5. Affinities. Contents: Introduction to Placoderms Time and Place of Origin of Placoderms Salient Features of Placoderms Classification of Placoderms Affinities of Placodermi 1. Introduction to Placoderms: The Placoderms, being quite […]
Fishes – Biology 2e
We should note, however, that the "ostracoderms" represent an assemblage of heavily armored extinct jawless fishes that may not form a natural evolutionary group. Fossils of the genus Haikouichthys from China, with an age of about 530 million years, show many typical vertebrate characteristics including paired eyes, auditory capsules, and ...
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Ostracoderm | Definition of Ostracoderm at Dictionary.com
Ostracoderm definition, any of several extinct jawless fishes of the Ordovician, Silurian, and Devonian periods, having the body enclosed in an armor of bony plates. See more.