acanthodian

acanthodian
/ak'euhn thoh"dee euhn/, n.
any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
[1850-55; < NL Acanthodi(i) pl. of ACANTHODIUS (equiv. to Acanthod(es) a genus ( < Gk akanthódes prickly, spiny; see ACANTH-, -ODE1) + L -ius) + -AN]

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Universalium. 2010.

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  • acanthodian — noun A member of a group of extinct fish (Acanthodii) that existed from the Silurian to the Permian period. The emerging picture of acanthodian (and perhaps placoderm) paraphyly does not overturn a general consensus about gnathostome… …   Wiktionary

  • acanthodian — ac·an·tho·di·an …   English syllables

  • acanthodian — /ˌækænˈθoʊdiən/ (say .akan thohdeeuhn) noun a primitive, spiny finned, shark like fish of the late Silurian and Devonian periods. {New Latin Acanthodes, genus name} …  

  • acanthodian — …   Useful english dictionary

  • Life Sciences — ▪ 2009 Introduction Zoology       In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …   Universalium

  • endoskeletal — adjective Of or pertaining to an internal skeleton, usually of bone (an endoskeleton). All of these studies have presupposed acanthodian monophyly and stereotyped acanthodian endoskeletal morphology on Acanthodes , the latest occurring, and a… …   Wiktionary

  • monophyly — noun In cladistics, the condition of being monophyletic, of including all descendants from a given ancestral species. All of these studies have presupposed acanthodian monophyly and stereotyped acanthodian endoskeletal morphology on Acanthodes ,… …   Wiktionary

  • Nerepisacanthus — Temporal range: Telychian–Ludlow …   Wikipedia

  • acanthodean — I. adjective see acanthodian I II. noun see acanthodian II …   Useful english dictionary

  • Silurian — Geological period from=444 middle=429 to=416 o2=14 co2=4500 temp=17The Silurian is a geologic period and system that extends from the end of the Ordovician period, about 443.7 ± 1.5 Ma (million years ago), to the beginning of the Devonian period …   Wikipedia

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