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This volume of the Handbook of Zoology summarizes "small" groups of animals across the animal kingdom. Dicyemida and Orthonectida are enigmatic parasites, formerly united as "Mesozoa" and their position among the multicellular animals is still not known with certainty. Placozoa are small, flat marine animals which provide important information on metazoan evolution. Comb jellies (Ctenophora) are esthetically fascinating animals which cause considerable discussion about their phylogenetic position. Seisonida are closely related to rotifers and acanthocephalans. Cycliophora were discovered and described as one of the last higher taxa and surprise by their complex life cycle. Kamptozoa (= Entoprocta) are small sessile animals in the sea and sometimes also in freshwater. Arrow worms (Chaetognatha) play an important role as predators in the plankton, but they also include benthic forms. Pterobranchia and acorn worms (Enteropneusta) belong to the deuterostomia and are related to echinoderms. In particular enteropneusts play an important role in understanding deuterostome evolution. These chapters provide up to date reviews of these exiting groups with reference to the important literature and therefore serves as an important source of information.
by Fred Wendorf, Romuald Schild and Angela E. Close INTRODUCTION roughly contemporaneous with the later part of Isotope Stage 7; most sites occur in sediments dated between 100 The Middle Paleolithic is potentially one of the most and 130 ka and fall early in the Last Interglacial; the most interesting periods in human history. It marks a major recent Middle Paleolithic site dates between 70 and 80 ka. at break from the long period of the Lower Paleolithic when the end of the Last Interglacial. there was essentially no change for several hundreds of thousands of years, and it was during the Middle THE MODERN ENVIRONMENT Paleolithic, and probably early in that stage, that the The two depressions of Bir Tarfawi and Bir Sahara East are modem form of human being first appeared in Africa (Stringer and Andrews 1988). We do not know whether the near the center of the southern Libyan Desert. They are earliest modem Africans behaved differently from Middle about 350 km southwest of Kharga Oasis, and the same Paleolithic people elsewhere in the world and of different distance west and slightly north of Abu Simbel, at 22°55'N, physical types, but we should find out. A study of human 28°45'E.