. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . are ectoparasitesof near-bottom sharks which are a consistent element of the fauna of the investigatedregions. Paracyphocaris praedator appears not to be a parasite of sharks, but of largeplanktonic crustaceans. In addition, Thoriella islandica and probably Parandania boecki,are parasites/predators of gelatinous zooplankters (Vinogradov 1988; Moore & Rainbow1989; Coleman 1990). The remaining 26 species can be categorized into two groups: typical inhabitants of themeso- and bathypelagic zones (it is thought that some
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . are ectoparasitesof near-bottom sharks which are a consistent element of the fauna of the investigatedregions. Paracyphocaris praedator appears not to be a parasite of sharks, but of largeplanktonic crustaceans. In addition, Thoriella islandica and probably Parandania boecki,are parasites/predators of gelatinous zooplankters (Vinogradov 1988; Moore & Rainbow1989; Coleman 1990). The remaining 26 species can be categorized into two groups: typical inhabitants of themeso- and bathypelagic zones (it is thought that some of them are able to collect prey fromthe bottom) and benthic animals only sporadically rising into the pelagial. Almost all the representatives of the first group are panoceanic species: onlyCyphocaris cornuta has not been found beyond the waters of the Mozambique the IKSAMT samples three species (Cyphocaris anonyx, C. challengeri andBathystegocephalus globosus) were found in great quantities and amounted to , and 78 ANNALS OF THE SOUTH AFRICAN MUSEUM. <n a GAMMARIDEAN AMPHIPODS IN THE WESTERN INDIAN OCEAN 79 per cent (respectively) of all amphipods so caught. That said, a considerableproportion of B. globosus was caught as a result of near-bottom trawling, as will bediscussed below. Comparison of the IKSAMT near-bottom and pelagic samples permits detection ofthat group of animals which is largely specific to the near-bottom layer of water. Someanimals were only recorded (practically) in the near-bottom catches: Trischizostomatanjae (155 out of 156 specimens, recorded in all samples), Ichnopuspelagicus (22 out of24 recorded specimens) and Regalia oculata sp. nov. (6 out of 7 recorded specimens). Ofthese T. tanjae, as already indicated, is most likely a parasite of near-bottom sharks, whichdetermines its concentration in this layer. The other two species are free-living animals. In addition, Amaryllis maculata sp. nov., Erikus dahli, Thoriella islandica
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