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New species of sperm whale identified from fossils found in Gunma

New sperm whale species discovered in Gunma fossils

Oct 19·japantimes.co.jp·1 min read

Intelligence analysis by Qwen 2.5 (3B)

Scientists have identified a new species of sperm whale from fossils found in Gunma, Japan. The species, named Miophyseter gunmaensis, combines traits of ancient and modern sperm whales.

Why it matters

This discovery offers insights into the evolution of deep-diving marine mammals and could help researchers understand the history of whale species.

Scientists found fossils of a whale that lived a long time ago in Japan. They think this whale is a new kind of sperm whale that lived in deep water and used both sucking and biting to eat.

Analysis

{"subheading":"The Discovery of Miophyseter gunmaensis","paragraph_1":"The fossils, dating back about 15.5 million years, were discovered by local fossil enthusiasts along tributaries of the Tone River in Gunma Prefecture, Japan. One specimen includes nearly a complete skeleton, believed to be that of a calf measuring 3 to 4 meters long.","paragraph_2":"The newly identified species, Miophyseter gunmaensis, has a large depression in its skull, thought to have helped it withstand the pressure of deep water. It also has well-developed throat bones that enabled it to suck in prey, unlike modern sperm whales which use both suction and biting to feed.","paragraph_3":"The study, published in the Journal of Vertebrate Paleontology, suggests that Miophyseter gunmaensis had more teeth than modern sperm whales, indicating it used both suction and biting to feed. This discovery adds to the growing list of new sperm whale species identified from fossils in Japan, following discoveries in Nagano and Aichi prefectures."}

Key points

  • New sperm whale species identified from fossils in Gunma, Japan
  • Miophyseter gunmaensis combines traits of ancient and modern sperm whales
  • The species had a large depression in its skull to withstand deep water pressure
  • It had more teeth than modern sperm whales, suggesting it used both suction and biting to feed
The Upside

This discovery could help us learn more about how whales evolved and how they lived in the past.

The Downside

The discovery of this new species might not have significant practical applications, but it could provide valuable insights for paleontologists and marine biologists.

Originally reported at

japantimes.co.jp

Discernion covers the story. Read the full piece at the source.

Tagswhalesgunmagunma-museum-of-natural-historysperm-whaleevolution

Intelligence analysis by

Qwen 2.5 (3B)

Published

Oct 19, 2026

Source

japantimes.co.jp

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Topics

whalesgunmagunma-museum-of-natural-historysperm-whaleevolution

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