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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Remarks on the possible function of the apophyses of the Middle Jurassic microconch ammonite Ebrayiceras sulcatum (ZIETEN, 1830), with a discussion on the palaeobiology of Aptychophora in general
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Remarks on the possible function of the apophyses of the Middle Jurassic microconch ammonite Ebrayiceras sulcatum (ZIETEN, 1830), with a discussion on the palaeobiology of Aptychophora in general

机译：关于中侏罗纪微海螺am生物Ebrayiceras sulcatum（ZIETEN，1830）的复生生物的可能作用的评论，并讨论了古猿的古生物学

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摘要

A newly found adult specimen of the aptychophoran ammonite microconch Ebrayiceras from the Lower Bathonian of Sengenthal, Oberpfalz (Germany, Bavaria) exhibits completely preserved prominent peristomal apophyses. The specimen is described and figured in some detail in order to demonstrate the extreme constriction of the aperture by the apophyses. These peristomal lappets are interpreted to represent a kind of protection shield, particularly against intersexual cannibalism during mating when the ammonite had to expose soft parts. It can be assumed that the adult Ebrayiceras was able to protrude only small brachia and hyponome through the minute apertural openings which raises the question how the animal could gather sufficient food. We suggest the possibility of mucous web feeding in Ebrayiceras as is e.g. the case in modern holoplanktic and planktotrophic thecosome gastropods. Such a feeding strategy would allow the ammonite to capture fair amounts of small planktic prey using relatively short brachia and without the necessity of protruding its head. It must be concluded that only because of such or a similar feeding strategy the extreme peristomal constriction of Ebrayiceras was possible. It is speculated that other aptychophoran ammonites also used a mucous web to capture planktic prey.
机译：一个新发现的成虫标本是来自Oberpfalz（德国巴伐利亚州）的森琴塔尔下巴东地区的aptychophoran micro微孔菌Ebrayiceras，显示出完整保存的突出的周生腐生体。对标本进行了详细描述和图形化处理，以证明由两性骨phy孔对孔的极端收缩。这些包皮毛毯被解释为代表一种保护罩，尤其是在交配过程中，当炸药必须暴露出柔软的部位时，可以防止两性相食。可以假定成年的埃布雷耶斯克拉斯只能通过微小的小孔开口伸出小臂肌和下垂肌，这引起了动物如何收集足够食物的问题。我们建议Ebrayiceras进行粘膜网喂食的可能性，例如在现代的全浮游性和浮游性共栖腹足类动物中。这种喂养策略将使the石能够使用相对较短的臂弯捕获大量的小板状猎物，而不必伸出头部。必须得出的结论是，仅由于这种或类似的喂养策略，才可能使埃伯雷克斯的极端的气孔收缩。据推测，其他aptopchophoran炸药也使用粘液网捕获浮游生物。

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