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9 results for “Balaenidae”
A right whale (Mysticeti, Balaenidae) from the Pleistocene of Taiwan
<p>Abstract</p> <p>Current patterns of biological distribution result from the deep past. Of particular interest, some closely related species appear at high latitudes of both hemispheres, but not in between, a pattern known as antitropical distribution. However, the timing, pathway, and drivers of antitropical distributions remain mostly unknown. Here we describe a new fossil, a left tympanic bulla (part of the ear bones), from the Middle/Late Pleistocene (0.78–0.01 mya, but not excluding the possibility of Holocene in age, as the specimen was dredged from the sea bottom and the geological horizon remains uncertain) of Taiwan. The tympanic bulla is diagnostic in baleen whales, and this specimen shows morphological features that are identical to extant <em>Eubalaena</em>, including: relatively large size (the anteroposterior length is 117 mm); rectangular outline in medial view; short anterior lobe, judging from the remaining of the lateral furrow; squared anterior margin; prominent transverse crease on the involucrum; transversely compressed in anterior view; well-developed and rounded outer lip; and parallel involucral and main ridges. Although incomplete, the morphological characters and overall similarity to extant <em>Eubalaena</em> allow a reliable taxonomic assignment to <em>Eubalaena</em> sp. The occurrence of a Pleistocene <em>Eubalaena</em> on the southern margin of the western North Pacific is the first balaenid fossil evidence indicative of the biotic interchange between two hemispheres leading to the origin of antitropical distribution in the Pleistocene; alternatively, this specimen might merely represent an extra-limital record of the North Pacific <em>Eubalaena</em>. Furthermore, this find suggests that the <em>Eubalaena</em> interchange, being one of the largest species displaying antitropical distribution pairs in the history of life, likely took place along the western Pacific. Notably, this does not preclude the <em>Eubalaena</em> interchange from other routes, such as the eastern Pacific or the Atlantic Ocean, and future finds should test the scenario for the biotic interchange between Northern and Southern Hemispheres of <em>Eubalaena</em>.</p>
On following pages: 2. North Pacific Right Whale (Eubalaena japonica); 3. Southern Right Whale (Eubalaena australis); 4. Bowhead Whale (Balaena mysticetus). in Balaenidae
On following pages: 2. North Pacific Right Whale (Eubalaena japonica); 3. Southern Right Whale (Eubalaena australis); 4. Bowhead Whale (Balaena mysticetus).
Distribution. N in Balaenidae
Distribution. N Atlantic, ranging from feeding areas used from spring to autumn (including Gulf of Maine, Bay of Fundy, and as far N as Nova Scotia) to the latewinter birthing grounds along the SE coast of North America (off Florida and Georgia), as well as sightings in the Gulf of Mexico and off Bermuda to the S; there are occasional records from Greenland, Iceland, and Norway. In the E Atlantic, historical records range S to Cintra Bay (23° N), Western Sahara.
Distribution. Circumpolar in the N Atlantic Ocean (NE Canada-W Greenland and E Greenland, Svalbard, Barents and Kara seas) and N Pacific Ocean (Bering—Chuckchi-Beaufort seas and Sea of Okhotsk). in Balaenidae
Distribution. Circumpolar in the N Atlantic Ocean (NE Canada-W Greenland and E Greenland, Svalbard, Barents and Kara seas) and N Pacific Ocean (Bering—Chuckchi-Beaufort seas and Sea of Okhotsk).
Distribution. Cold-temperate waters of the N Pacific, from Bonin Is (27° N, 142° E) and Ryukyu Is N to Yellow Sea, Sea ofJapan, Sea of Okhotsk, Bering Sea and Gulf of Alaska; occasionally reaching tip of Baja California, Mexico, to the S of E Pacific in winter. Except on their N summer grounds, only a few sightings in the E Pacific Ocean during the past 50 years. in Balaenidae
Distribution. Cold-temperate waters of the N Pacific, from Bonin Is (27° N, 142° E) and Ryukyu Is N to Yellow Sea, Sea ofJapan, Sea of Okhotsk, Bering Sea and Gulf of Alaska; occasionally reaching tip of Baja California, Mexico, to the S of E Pacific in winter. Except on their N summer grounds, only a few sightings in the E Pacific Ocean during the past 50 years.
Distribution. Cold-temperate waters of the Southern Hemisphere, mainly at 20-60° S except on both coasts of South America, where they occur at most lower latitudes. Concentrated in winter near the coastlines off S Australia, New Zealand, Atlantic coast of South America (Argentina, Brazil), and S Africa (mainly South Africa), but also off Chile, Peru, Tristan da Cunha Is and the E coast of Madagascar; in summer they are found mainly in latitudes of 40-50° S but have been seen in the Antarctic as far as 65° S and around South Georgia Is. in Balaenidae
Distribution. Cold-temperate waters of the Southern Hemisphere, mainly at 20-60° S except on both coasts of South America, where they occur at most lower latitudes. Concentrated in winter near the coastlines off S Australia, New Zealand, Atlantic coast of South America (Argentina, Brazil), and S Africa (mainly South Africa), but also off Chile, Peru, Tristan da Cunha Is and the E coast of Madagascar; in summer they are found mainly in latitudes of 40-50° S but have been seen in the Antarctic as far as 65° S and around South Georgia Is.
• 1500-2000 cm. in Balaenidae
• 1500-2000 cm.
• Arctic, North Pacific, North Atlantic, and Southern oceans. in Balaenidae
• Arctic, North Pacific, North Atlantic, and Southern oceans.
Balaena mysticetus Lancaster Sound, Nunavut, Canada. Photo: Paul Nicklen/GETTY in Balaenidae
Balaena mysticetus Lancaster Sound, Nunavut, Canada. Photo: Paul Nicklen/GETTY
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