Melanopsis from the Pleistocene of the Hula Valley (Gastropoda: Cerithioidea)

摘要: Pleistocene Melanopsis from three cores in the Hula Valley (a northern section of Jordan Valley) were reinvestigated, and six species found: buccinoidea, costata, obediensis, multiformis, corrugata, turriformis. These are described, compared, their chronological appearance presented terms depths beneath surface. There appears to have been an overall continuity fauna throughout Pleistocene. Some previously reported variation isotopic records shells may perhaps represent different physiology species. Fossil hybrids Valley, as found also this study, offer earliest direct evidence hybridization among molluscs that is still going on today same region aquatic system, Correlations with lithology suggest none dwelt swamps; corrugata lake dwellers; turriformis transitional habitats, between lakes swamps. recent paleo-landscape buccinoidea consisted a spring or stream, costata bank river lake. Where both found, stream flowing into About quarter local extinctions coincided brief spreading Incomplete competitive succession fossil lake-dwelling