Melanopsis from the mid-pleistocene site of gesher benot ya'aqov (gastropoda: cerithioidea)

J. Heller*, N. Sivan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Gesher Benot Ya'aqov is a 780,000 yr. old mid-Pleistocene site in the Hula Valley (Israel). Its rich Melanopsis fauna was found to include seven species: buccinoidea Olivier, costata Olivier (with two ill-defined forms, shouldered and conic), obediensis Picard, corrugata Schütt, vincta Blanckenhorn, sigmocorrugata n. sp. and turriformis Picard (with three ill-defined forms, 'typical', 'ivory' and 'gray-orange'). Within the Jordan Valley, the Melanopsis faunal assemblage of Gesher Benot Ya'aqov is broadly similar to that of 'Ubeidya. Beyond the Jordan Valley three species of Gesher Benot Ya'agov occur also in Plio-Pleistocene sites of the Orontes, thereby weakening arguments that the fauna of the Jordan evolved independently of the Orontes catchment area. Most shells at Gesher Benot Ya'aqov fall into clearly distinct species. However, intermediates are found between vincta and corrugata and between buccinoidea and turriformis. The occasional occurrence of the buccinoidea-turriformis intermediates within the layers of Gesher Benot Ya'aqov suggests that they are hybrids (rather than representatives of gradual evolutionary transition). Similarly among Recent Melanopsis, smooth-shelled buccinoidea and costate-shelled costata almost always remain distinct, but in zones of contact hybrids with intermediate shells may be found, at low frequencies and over short distances.

Original languageEnglish
Pages (from-to)127-147
Number of pages21
JournalJournal of Conchology
Volume37
Issue number2
StatePublished - 2001

Keywords

  • Gesher benot ya'aqov
  • Hybrids
  • Jordan valley
  • Melanopsis
  • Pleistocene
  • Systematics

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