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[[Category:Silurian first appearances]] [[Category:Pridoli taxonomic orders]] ...

...l_range = {{fossilrange|526|416}}[[Atdabanian|Late Atdabanian]]-[[Silurian|Pridoli]] *?''[[Pseudonaraoia]]''<ref name="BUDIL">{{cite journal|last=Budil |first=Peter |author2=Oldřich Fatka |author3=Jana Brutansová|title=Trilobite fauna ...

...as respiratory gas bladders.<ref name="Clack2012">{{cite book |last=Clack |first=Jennifer A.|author-link=Jenny Clack|title=Gaining Ground, Second Edition: T [[Category:Pridoli first appearances]] ...

...rs]], each with a single [[genus]].<ref name="umd">{{cite web|last=Shultz |first=Jeff |url=http://www.life.umd.edu/entm/shultzlab/vtab/arthropleuridea.htm | ...ed only by analogy to modern arthropods.<ref>{{cite book | last = Fortey | first = Richard | authorlink = Richard Fortey |author2 = R. H. Thomas | title = A ...

..."Størmer2">{{cite book|title=Part P Arthropoda 2, Chelicerata|last=Størmer|first=Leif|year=1955|series=[[Treatise on Invertebrate Paleontology]]|pages=30–31 ...d {{convert|2|m|ft}}.<ref name=":2">{{Cite journal|last=Kjellesvig-Waering|first=Erik N.|date=1964|title=A Synopsis of the Family Pterygotidae Clarke and Ru ...

| fossil_range = {{Fossil range|Pridoli|Sakmarian}}<small>[[Late Silurian]] to [[Early Permian]]</small> ...tends from the late [[Silurian]] to the early [[Permian]] ([[Pridoli epoch|Pridoli]] to [[Sakmarian]]).<ref name=FExp>{{cite journal|title=Fossils Explained: ...

...name=":8" /><ref name=":17" /><ref name=":18">{{Cite journal |last=Ezaki |first=Yoichi |last2=Masui |first2=Mitsuru |last3=Nagai |first3=Koichi |last4=Webb ...y of Kansas |year=2015 |isbn=978-0-9903621-2-8 |editor-last=Selden |editor-first=Paul A. |edition= |series=[[Treatise on Invertebrate Paleontology]] |volume ...

...-520-94798-6|page=38}}</ref><ref name="Benton2014">{{cite book|last=Benton|first=Michael|author-link=Michael Benton|title=Vertebrate Palaeontology|url=https ...nantly bony skeleton.<ref name="Romer & Parson">{{cite book |last=Parsons |first=Thomas S. |author2=Romer, Alfred Sherwood |author2-link=Alfred Sherwood Rom ...

...ditor2-last=Denton |editor2-first=John S.S. |editor3-last=Janvier |editor3-first=Philippe}}</ref> ...their mouth. Thus, it is unknown whether the dermal or oral teeth evolved first. It has even been suggested{{by whom|date=August 2018}} that the original b ...

...and pelvic fins have articulations resembling those of tetrapod limbs. The first tetrapod land vertebrates, basal amphibian organisms, possessed legs derive ...ean rank such as infraclass or division.<ref>{{Cite journal |last=AHLBERG |first=PER ERIK |date=1991-11-01 |title=A re-examination of sarcopterygian interre ...

...ion years]].<ref name="Dalrymple 2001 AoE">{{cite journal |last=Dalrymple |first=G. Brent |date=2001 |title=The age of the Earth in the twentieth century: a ...te=stratigraphy.org}}</ref><ref name="Boggs-2011">{{Cite book |last=Boggs |first=Sam |title=Principles of sedimentology and stratigraphy |date=2011 |publish ...

...iod, 467.3 [[Myr|million years ago]]. The group is likely to have appeared first either during the [[Early Ordovician]] or [[Late Cambrian]] period. With ap ...f appendages which are usually referred to as appendage pairs I to VI. The first pair of appendages, the only pair placed before the mouth, is called the [[ ...

.../><ref name=Fortey00a>{{citation|title=Trilobite!: Eyewitness to Evolution|first=Richard|last=Fortey|author-link=Richard Fortey |year=2000|isbn=978-0-00-257 ...aɪ|l|ə|ˌ|b|aɪ|t|s|,_|ˈ|t|r|ɪ|l|ə|-}};<ref>{{cite encyclopedia |last=Jones |first=Daniel |author-link=Daniel Jones (phonetician) |title=trilobite |encycloped ...