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ট্রাইসেরাটপস (Triceratops)
সরীসৃপ
ট্রাইরাসোটোপগুলি নিরামিষভোজী সিরাটোপসিড ডাইনোসরের একটি বিলুপ্ত প্রজাতি যা বর্তমানে উত্তর আমেরিকাতে প্রায় ৮ মিলিয়ন বছর পূর্বে মরহুম ক্রিটাসিয়াসের শেষ পর্যায়ের মাষ্ট্রিচটিয়ান পর্যায়ে প্রথম উপস্থিত হয়েছিল।
বৈজ্ঞানিক নাম: Triceratops
উচ্চতা: ২.৯ – ৩ m
সবচেয়ে পুরানো জীবাশ্মের রেকর্ড: Campanian
ভর: ৬,০০০ – ১২,০০০ কেজি
Triceratops
Reptiles
Triceratops is an extinct genus of herbivorous ceratopsid dinosaur that first appeared during the late Maastrichtian stage of the Late Cretaceous period, about 68 million years ago in what is now North America.
Eaten by: Tyrannosaurus
Height: 2.9 – 3 m
Mass: 6,000 – 12,000 kg
Length: 7.9 – 9 m
Speed: 32 km/h (Maximum)
Fossils: Yoshi's Trike, Raymond, AMNH 5039, Kelsey, Hatcher
Eats: Cycads, Palm trees

18/08/2021

Iguanodon
সরীসৃপ

ইগুয়ানডন, 1825 সালে নামকরণ করা হয়েছে, এটি আইগাওনডোটিয়ান ডায়ানোসরের একটি জেনাস।
উচ্চতা: ২.৭ m (প্রাপ্তবয়স্ক)
দৈর্ঘ্য: ১০ m (প্রাপ্তবয়স্ক)
ভর: ৪,০০০ – ৫,০০০ কেজি
guanodon (/ɪˈɡwɑːnədɒn/ i-GWAH-nə-don; meaning 'iguana-tooth'), named in 1825, is a genus of iguanodontian dinosaur. While many species have been classified in the genus Iguanodon, dating from the late Jurassic Period to the early Cretaceous Period of Asia, Europe, and North America, taxonomic revision in the early 21st century has defined Iguanodon to be based on one well-substantiated species: I. bernissartensis, which lived from the late Barremian to the earliest Aptian ages[4] (Early Cretaceous) in Belgium, Germany, England, Spain, and possibly elsewhere in Europe, between about 126 and 122 million years ago. Iguanodon were large, bulky herbivores. Distinctive features include large thumb spikes, which were possibly used for defense against predators, combined with long prehensile fifth fingers able to forage for food.

The genus was named in 1825 by English geologist Gideon Mantell but discovered by William Harding Bensted, based on fossil specimens found in England and was given the species name I. anglicus. Iguanodon was the second type of dinosaur formally named based on fossil specimens, after Megalosaurus. Together with Megalosaurus and Hylaeosaurus, it was one of the three genera originally used to define Dinosauria. The genus Iguanodon belongs to the larger group Iguanodontia, along with the duck-billed hadrosaurs. The taxonomy of this genus continues to be a topic of study as new species are named or long-standing ones reassigned to other genera. In 1878 new, far more complete remains of Iguanodon were discovered in Belgium and studied by Louis Dollo. These were given the new species I. bernissartensis. In the early 21st century it became understood that the remains referred to Iguanodon in England belonged to four different species (including I. bernissartensis) that were not closely related to each other, which were subsequently split off into Mantellisaurus, Barilium and Hypselospinus. It was also found that the originally described type species of Iguanodon, I. anglicus was a nomen dubium, and not valid. Thus the name "Iguanodon" became fixed around the well known species based primarily on the Belgian specimens. In 2015, a second valid species, I. galvensis, was named, based on fossils found in the Iberian Peninsula.

Scientific understanding of Iguanodon has evolved over time as new information has been obtained from fossils. The numerous specimens of this genus, including nearly complete skeletons from two well-known bone beds, have allowed researchers to make informed hypotheses regarding many aspects of the living animal, including feeding, movement, and social behaviour. As one of the first scientifically well-known dinosaurs, Iguanodon has occupied a small but notable place in the public's perception of dinosaurs, its artistic representation changing significantly in response to new interpretations of its remains.