![Ilmuwan Klaim Kanguru Purba Tidak Melompat, Begini Jalannya](https://cdns.klimg.com/mav-prod-resized/480x/ori/feedImage/2024/1/12/1705065975166-wd03c.jpeg)
![Ilmuwan Klaim Kanguru Purba Tidak Melompat, Begini Jalannya](https://cdns.klimg.com/mav-prod-resized/480x/ori/feedImage/2024/1/12/1705065975166-wd03c.jpeg)
In a new study, paleontologists from England and Sweden reviewed fossil evidence of kangaroo and its relatives' (wallaby, tree-kangaroo, rat-kangaroo, etc.) movements over the past 25 million years. Their research findings indicate that high-speed hopping, commonly found in modern large kangaroos, may be rare or absent except in some groups of large kangaroos, including direct ancestors of modern large kangaroos such as the red kangaroo and the grey kangaroo.
Makropodidae, the crown group that includes kangaroos, wallaroos, wallabies, pademelons, tree kangaroos, quokkas, striped rabbit wallabies, and extinct short-faced kangaroos, are classic "environmentally friendly" models for adaptive specialization towards higher speed and jumping endurance.
Although the popular image of the 'flying kangaroo' QANTAS, the evolution of kangaroo movement and its more distant crown group relatives turned out to be highly diverse, with documented fossil and living species showing various modes of movement such as bipedal, quadrupedal, saltatorial, pentapedal, ambulatory, cursorial, and scansorial, as well as digging behavior that has developed over the past 25 million years.
The oldest recognized kangaroo species from the Late Oligocene to the Middle Miocene (25 to 15 million years ago) likely used quadrupedal hopping, climbing, and slow hopping as their primary modes of movement. However, all early forms were small, weighing less than 12 kg, with larger kangaroos above 20 kg appearing in the Late Miocene (around 10 million years ago), coinciding with increased aridity and the spread of open vegetated habitats.
Therefore, some kangaroo radiation members then achieve a more specialized anatomy for efficient high-speed jumps in body sizes above 35 kg.
The translation of the given text from Bahasa to English while preserving any HTML tags is as follows:
Kangaroo is an extraordinary modern creature in jumping, but currently there is none that weighs above 100 kg (most are below 70 kg) and many extinct forms were much larger than this and too big to jump.
"The fact is, modern large jumping kangaroos are exceptions in kangaroo evolution."
Although jumping seems to have originated in early kangaroo evolution, in small-sized forms, with the emergence of larger-sized kangaroos in the Late Miocene, there were several different options: to specialize in long-lasting jumps of large size, as in the case of modern kangaroo ancestors, or to adopt other forms of high-speed movement, as in the case of two main extinct branches.
Protemnodon (commonly known as 'giant wallaby', closely related to modern large kangaroos) is likely to rely on quadripedal movement most of the time, and rarely performs jumps. The short-faced sthenurine kangaroo, a branch that diverged from all modern kangaroos about 15 million years ago, seems to have adopted a bipedal walking style at all speeds.
New data on the length of the tibia (shinbone) and calcaneum (ankle bone) strengthens the previous hypothesis about the differences in movement between modern kangaroos and these two extinct groups.
"Especially supported by this new data is the idea of walking bipedally rather than hopping in sthenurines, as their calcanea do not have the anatomy (long calcaneal heel) that would help counteract the rotational forces on the ankle experienced during hopping, and show a more upright leg posture than the hunched posture important for hopping," said co-author Adrian O'Driscoll, a Ph.D. student at the University of York."
"Assuming that the increase in droughts across continents after the end of the Miocene selectively supports kangaroos jumping too simplistically," said Professor Janis. "Jumping is just one of many modes of movement used by kangaroos both in the past and today, and jumping with high endurance in modern kangaroos should not be considered as the 'peak of evolution'."
Source: Sci.news
The following 'Bahasa' text translated to 'English' while preserving any html tags: "This team's paper is published in Alcheringa: an Australasian Journal of Palaeontology."
Para ilmuwan masih mempertanyakan keberadaan belut raksasa di perairan danau Skotlandia.
Read MoreBerikut fakta menarik mengenai semut matabele yang mampu menyembuhkan dirinya dari kematian!
Read MoreTylototriton adalah genus besar salamander, umumnya dikenal sebagai kadal air buaya, milik keluarga Salamandridae.
Read MoreArthropoda purba ini mirip udang besar ini memiliki tiga mata di kepala dan sepasang anggota tubuh menakutkan.
Read MoreDreaming of a friend giving birth to a baby girl is often a meaningful experience for some people.
Read MoreHere are interesting facts about the new species of Pterosaur called Venetoraptor Gassenae!
Read MoreMereka ke sekolah dengan kancing baju terbuka setengah.
Read MoreThis dream can depict fear, anxiety, or a sense of threat that someone may experience in their daily life.
Read MorePrayers After Complete Fard Prayer Latin and Its Meaning, to Ask for Guidance and Protection
Read MoreKuil Romawi dari Zaman Kaisar Konstantin Terungkap Setelah 1.600 Tahun Tersembunyi.
Read MoreRasulullah saw mengajarkan tidak minum setelah makan memiliki alasan tersendiri yang baik bagi manusia.
Read MoreHikmah dan Doa untuk Kucing yang Mati, beserta Tata Cara Menguburnya dalam Islam
Read MoreThe latest research reveals that this deadly tsunami is called Storegga.
Read MoreHowever, when running in the fourth round with Cassie, he felt a piercing pain in his leg.
Read MoreGigantopithecus blacki mungkin tidak berhasil beradaptasi dengan lingkungan yang berubah.
Read MoreKunjungan ini ini adalah delegasi non muslim pertama yang berkunjung ke kota suci kedua umat Islam tersebut.
Read MoreInilah tiga kata terpanjang dalam Bahasa Indonesia!
Read MoreBerikan doa terbaik untuk orang yang menikah dengan bacaan doa di bawah ini!