. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 264 ANNALS OF THE SOUTH AFRICAN MUSEUM Cytheropteron (57 species), Krithe (54 species) is the most diverse genus in the Quaternary ostracod faunas of the bathyal and abyssal regions of the south- western Pacific. Similarly, Krithe (together with one species of Parakrithe) and Cytheropte- ron are the two most diverse genera in the deep-water faunas off south-western Africa (12 species each), whereas in the Abyssal Zone the genus Krithe is the most abundant taxon. It occurs across the entire latitudina
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 264 ANNALS OF THE SOUTH AFRICAN MUSEUM Cytheropteron (57 species), Krithe (54 species) is the most diverse genus in the Quaternary ostracod faunas of the bathyal and abyssal regions of the south- western Pacific. Similarly, Krithe (together with one species of Parakrithe) and Cytheropte- ron are the two most diverse genera in the deep-water faunas off south-western Africa (12 species each), whereas in the Abyssal Zone the genus Krithe is the most abundant taxon. It occurs across the entire latitudinal range of our study area (17°S to 38°S), and is found over a more extensive water-depth range than any other genus (238-4 736 m, Fig. 10). With one exception {Krithe sp. 9), all the species are found in either bathyal or abyssal depths, and five also occur in the Neritic Zone (Fig. 13). On a regional scale, variations in the abundance of Krithe within the overall ostracod populations have been used (together with Henryhowella melobesioides (Brady, 1869) and Buntonia rosenfeldi sp. nov.) to help identify the limits of the faunal zones off south-western Africa (see Figs 54, 55). Figure 11 shows that the abundance of Krithe species (as a percentage of the total ostracod fauna) varies greatly over the water-depth range of the genus, and that there is not a simple progressive increase in values oceanward. This can be further emphasized when mean values for individual depth zones are exam- ined: Figure 12 shows that, although the overall trend is Neritic (19%) through ? = K. capensis "D = Parakrithe ? ABYSSAL. LOWER BATHYAL UPPER ????B B 5 ? NERIT IC 35 i r i 20 25 —J- 30 latitude °S Fig. 10. Latitude and water depth of samples bearing Krithe species and Parakrithe sp. 10. The distributions of Krithe capensis sp. nov. and Parakrithe sp. 10 are Please note that these images are extracted from scanned page images that may have been digitally enhanced for rea
Size: 4065px × 615px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
