The manus of the Narwhal, Monodon monoceros L.
Article first published online: 7 MAY 2010
1954 The Zoological Society of London
Proceedings of the Zoological Society of London
Volume 124, Issue 2, pages 201–212, August 1954
How to Cite
Eales, N. B. (1954), The manus of the Narwhal, Monodon monoceros L. Proceedings of the Zoological Society of London, 124: 201–212. doi: 10.1111/j.1469-7998.1954.tb07777.x
- Issue published online: 6 JUL 2010
- Article first published online: 7 MAY 2010
- Received 9th May 1953
- 1The flipper of the Narwhal has been investigated in foetal and adult stages, with special reference to the carpus.
- 2In the foetus, radiale, intermedium and ulnare, a single centrale, trapezoid, magnum and separate distal carpals 4 and 5 are present. There is no trace of a pisiform or of a trapezium. The centrale fuses with the intermedium. Distal carpals 4 and 5 unite to form an uneiform. In the adult there are three bones in the distal row.
- 3In the allied Delphinapterus (adult) the form of the flipper is similar, but the trapezoid is missing, as it is in Phocaena (Phocaenidae).
- 4In the Delphinidae, as illustrated by Globiocephala, trapezoid, magnum and uneiform are present.
- 5In broad-handed whales (Monodon, Delphinapterus, Phocaena) the number of phalanges decreases with age, in narrow-handed whales this number increases as the whale matures.
- 6The carpus of whales is of the interlocking type.
- 7A centrale has now been found during development in all mammals except some ungulates.
- 8Whales are the only mammals retaining traces of separate fourth and fifth distal carpals.