Eodromaeus

Eodromaeus
Triaskausi
Tieteellinen luokittelu
Kunta: Eläinkunta Animalia
Pääjakso: Selkäjänteiset Chordata
Luokka: Matelijat Reptilia
Ylälahko: Dinosaurukset Dinosauria
Lahko: Liskonlantioiset Saurischia
Alalahko: Teropodit Theropoda
Suku: Eodromaeus
Laji: murphi
Kaksiosainen nimi

Eodromaeus Murphi
Martinez et al. 2011

Katso myös

  Eodromaeus Wikispeciesissä
  Eodromaeus Commonsissa

Eodromaeus (nimen merkitys ’Aamunkoiton juoksija’) on sukupuuttoon kuollut teropodi-dinosaurus. Se eli noin 230 miljoonaa vuotta sitten nykyisen Argentinan alueella, myöhäistriaskaudella.[1][2]

Fossiilit

Eodromaeus
Eodromaeus verrattuna aikuiseen ihmiseen

Argentiinalainen paleontologi Ricardo N. Martinez ja Jim Murphy löysivät Eodromaeuksen fossiilit ensimmäisenä vuonna 1996 Ischigualasto-muodostelmasta ja ensimmäiseksi uskottiin, että sen fossiilit olivat uusi Eoraptor-laji.[3][4][5] Kun sitä alettiin tutkia paremmin huomattiin, että sen fossiilissa oli joitakin ominaisuuksia mitä Eoraptorilla ei ollut. Tämä tarkoitti uutta lajia. Lajin nimesi Ricardo Martinez, Paul Sereno ja heidän kollegansa. Tähän mennessä lajista on löydetty osittainen luuranko, josta puuttuu vielä muutama osa kalloa, häntä, kylkiluita ja muita osia.[4] Tästä kumminkin huolimatta on kuitenkin selvää, millainen dinosaurus Eodromaeus oli.[4]

Kuvaus

Eodromaeuksella on pitkä ja matala kallo, joka oli täynnä teräviä hampaita, ja anatomisesti se muistuttaa jonkin verran Herrerasaurusta. Eudromaeus oli noin 1,2-1,8 metriä pitkä dinosaurus ja painoi noin 5 kilogrammaa.[1][6] Eodromaeuksella eturaajat olivat paljon lyhyemmät kuin takaraajat ja se juoksi kahdella jalalla.[2] On ehdotettu, että se pystyi juoksemaan noin 30 kilometriä tunnissa.[5]

Elinalue

Eodromaues eli hyvin märissä metsiköissä, tiheiden jättihavupuiden luomassa.[1]

Kladogrammi

Alapuolella on Martinezin kehittämä kladogrammi vuodelta 2011.[7]

Dinosauromorpha

Lähteet

  1. ↑ a b c Gregory S. Paul: The Princeton field guide to dinosaurs 2nd edition, s. 73. Princeton, N.J, 2016. ISBN 978-0-691-16766-4
  2. ↑ a b Sindya N. Bhanoo: A Pet-Size Dinosaur With Really Big Descendants The New York Times. 13.1.2011. Viitattu 21.1.2020. (englanti)
  3. ↑ Eodromaeus www.prehistoric-wildlife.com. Viitattu 21.1.2020.
  4. ↑ a b c R. Martinez, P. Sereno, O. Alcober, C. Colombi, P. Renne, I. Montanez: A Basal Dinosaur from the Dawn of the Dinosaur Era in Southwestern Pangaea. Science, 2011, nro 6014, s. 206–210. doi:10.1126/science.1198467 ISSN 0036-8075 Artikkelin verkkoversio.
  5. ↑ a b New dog-sized dinosaur discovered usatoday30.usatoday.com. Viitattu 21.1.2020. (englanniksi)
  6. ↑ Theropod | dinosaur suborder Encyclopedia Britannica. Viitattu 21.1.2020. (englanniksi)
  7. ↑ GEOL 104 The Rise of the Dinosaurs: What is a Dinosaur (version 2.0)? Geol.umd.edu. Viitattu 21.1.2020. (englanniksi)

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