Shenshou

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Shenshou
Temporal range: 160  Ma
Shenshou NT small.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Clade: Mammaliaformes
Order:† Haramiyida
Genus:† Shenshou
Bi, Wang, Guan, Sheng and Meng, 2014
Species:
†S. lui
Binomial name
†Shenshou lui
Bi, Wang, Guan, Sheng and Meng, 2014

Shenshou is a genus of haramiyidan dating from the Oxfordian stage of the Late Jurassic, approximately 160 million years ago. Fossils were recovered from the Tiaojishan Formation in the Liaoning province of China. [1]

Contents

Etymology

The generic name is derived from Mandarin (神獸 shénshòu) shen, meaning deity, and shou, meaning animal, while the specific name is in reference to Lu Jianhua, the scientist who collected the holotype specimen. [1]

Description

Shenshou is thought to be arboreal because it had a light frame, a prehensile and elongated tail, and hands and feet which had evolved for clutching and enabled the animal to climb. [2] [3] These features, including the large incisors of Shenshou, made the animal resemble a squirrel. However, Shenshou are not the direct ancestors of squirrels, the resemblance being purely due to convergent evolution. [3] Individuals are believed to have weighed 300 grams (11 oz). [1] The presence of a three-boned middle ear suggests these animals were mammals; [3] however, it has since been determined haramiyidans developed their ear bones independently from true mammals and are Mammaliaformes outside of the mammal crown-group. [4] [5] [6] The teeth, which have a number of cusps, suggest that Shenshou was probably an omnivore, most likely with a diet of fruits, nuts and insects. [3] [7]

References

  1. 1 2 3 Bi, Shundong; Wang, Yuanqing; Guan, Jian; Sheng, Xia; Meng, Jin (10 September 2014). "Three new Jurassic euharamiyidan species reinforce early divergence of mammals". Nature . 514 (7524). Nature Publishing Group: 579–584. Bibcode:2014Natur.514..579B. doi:10.1038/nature13718. PMID   25209669. S2CID   4471574.
  2. ↑ Switek, Brian (10 September 2014). "Chisel-Toothed Beasts Push Back Origin of Mammals". National Geographic. Archived from the original on September 12, 2014. Retrieved 12 September 2014.
  3. 1 2 3 4 Choi, Charles Q. (10 September 2014). "Ancient Squirrel-Like Creatures Push Back Mammal Evolution". LiveScience. Retrieved 11 September 2014.
  4. ↑ Chang, Kenneth (16 November 2015). "Jawbone in Rock May Clear Up a Mammal Family Mystery". New York Times . Retrieved 17 November 2015.
  5. ↑ Luo, Zhe-Xi; Gates, Stephen M.; Jenkins Jr., Farish A.; Amaral, William W.; Shubin, Neil H. (16 November 2015). "Mandibular and dental characteristics of Late Triassic mammaliaform Haramiyavia and their ramifications for basal mammal evolution". PNAS . 112 (51): E7101 –E7109. Bibcode:2015PNAS..112E7101L. doi: 10.1073/pnas.1519387112 . PMC   4697399 . PMID   26630008.
  6. ↑ Qing-Jin Meng; David M. Grossnickle; Di Liu; Yu-Guang Zhang; April I. Neander; Qiang Ji; Zhe-Xi Luo (2017). "New gliding mammaliaforms from the Jurassic". Nature. in press. doi:10.1038/nature23476.
  7. ↑ "Three extinct squirrel-like species discovered: Mammals may have originated much earlier than thought". ScienceDaily. American Museum of Natural History. 10 September 2014. Retrieved 12 September 2014.
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