Definitions for placoderm
ˈplæk əˌdɜrmpla·co·derm

Princeton's WordNetRate this definition:0.0 / 0 votes

1. placodermnoun

   fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws

WiktionaryRate this definition:0.0 / 0 votes

1. placodermnoun

   A member of an extinct group of fish with armored heads; the group lived during the Silurian and Devonian periods.

WikipediaRate this definition:0.0 / 0 votes

1. placoderm

   Placodermi 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. Placoderms were among the first jawed fish; their jaws likely evolved from the first of their gill arches. Placoderms are thought to be paraphyletic, consisting of several distinct outgroups or sister taxa to all living jawed vertebrates, which originated among their ranks. In contrast, one 2016 analysis concluded that placodermi are likely monophyletic, though these analyses have been further dismissed with more transitional taxa between placoderms and modern gnathosthomes, solidifying their paraphyletic status.Placoderms were also the first fish to develop pelvic fins, the precursor to hindlimbs in tetrapods, as well as true teeth. 380-million-year-old fossils of three other genera, Incisoscutum, Materpiscis and Austroptyctodus, represent the oldest known examples of live birth.The first identifiable placoderms appear in the fossil record during the late Llandovery epoch of the early Silurian. The various groups of placoderms were diverse and abundant during the Devonian, but became extinct at the end-Devonian Hangenberg event 358.9 million years ago

ChatGPTRate this definition:0.0 / 0 votes

1. placoderm

   A placoderm is a type of prehistoric fish, which were among the first jawed vertebrates. They are distinguished by their armored plates on their bodies. They dominated seas, rivers, and lakes during the Devonian period (around 420 to 350 million years ago) before they became extinct.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Placodermnoun

   one of the Placodermi

2. Etymology: [Gr. pla`x, plako`s, tablet + de`rma skin.]

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Placoderm

   plak′o-dėrm, adj. noting an order of fossil fishes having their skin covered with bony plates. [Gr. plax, plakos, anything flat, derma, skin.]

Matched Categories

1. • Aquatic Vertebrate

How to pronounce placoderm?

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Numerology

1. Chaldean Numerology

   The numerical value of placoderm in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of placoderm in Pythagorean Numerology is: 6

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=placoderm
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Placoderm
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Placoderm
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/placoderm
6. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=placoderm