Zustand: New. Throughout the Southern Hemisphere, closely related species are found on landmasses separated by wide stretches of ocean. What explains these far-flung distributions? More generally, why are species found where they are across the Earth? This narrative describes a new theory of how species dispersal occurred through ocean crossings. Num Pages: 368 pages, black & white illustrations, maps. BIC Classification: PSAJ. Category: (G) General (US: Trade). Dimension: 164 x 242 x 31. Weight in Grams: 590. . 2014. 1st Edition. Hardcover. . . . . Books ship from the US and Ireland.