First record of coloured patterns in Palaeogene Muricidae (Mollusca, Gastropoda)
- 作者：Merle ; Didier
- 关键词：Coloured patterns ; Muricidae ; Palaeogene ; UV light ; Homology ; Coloration originale ; Muricidae ; Palé ; ogè ; ne ; UV ; Homologie
- 刊名：Annales de Paleontologie
- 出版年：2003
- 期刊代码：6_07533969
- 类别：env
- 出版时间：July, 2003
- 卷：89
- 期：3
- 页码：191-203
- 文件大小：621 K
摘要
The coloured patterns of the muricids may be divided in three main groups: (1) clear to dark uniform colour, (2) dark bands covering several spiral cords, (3) clear to dark cords contrasting with the main colour. The two last patterns, observed in Neogene muricids from the Western Atlantic region (USA), were unknown in Palaeogene species. In order to detect them in Palaeogene muricids, 35 species from 23 fossiliferous localities (Paris, Aquitaine and Loire-Atlantique basins) have been examined under Ultra-Violet light. On 1200 specimens, positive results have been obtained in two species (?Trophonopsis peregra (Beyrich, 1854), Rupelian and ?Paziella plini (de Raincourt, 1874), Middle Eocene). Both species bear the second type of pattern. In ?T. peregra (Auvers-St-Georges, Paris Basin), its occurrence is occasional. Conversely, in ?P. plini it is preserved from the Lutetian (Villiers-St-Frédéric, Paris basin) to the Bartonian (Bois-Gouët, Loire-Atlantique). The coloured bands seem similar in both species, but are probably not homologous. Effectively, the close analysis of the spiral sculpture shows that they differ by their place on the cords and even allows to reveal an intraspecific variation between the populations of ?P. plini.