Huxley’s Line

Huxley's Line is a biogeographical boundary that was proposed by Thomas Henry Huxley. It is considered by some zoogeographers to be a more appropriate delineation of faunal regions than the Wallace Line. This line is significant because it represents an abrupt limit for the distribution of many major animal groups, with distinct faunas found on either side.12

The Wallace Line, proposed by Alfred Russel Wallace, extends through the Indian Ocean, Lombok Strait, Makassar Strait, and into the Philippine Sea. While many zoogeographers no longer view it as a strict regional boundary, it still highlights significant differences in the distribution of various animal species. Huxley's modification of this line, placing it west of the Philippines, is considered by some to better reflect the unique fauna of the region.21