Evolutionary history of naticid shell-drilling predation

游虫类钻壳捕食的进化史

基本信息

批准号：
02640616
负责人：
KASE Tomoki
金额：
$ 1.22万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

1. Based on anatomical research of a living fossil snail, Globularia fluctuata (Sowerby), this snail has a primitive nervous system and shares many features common to freshwater ampullariid snails. Also, G. fluctuata is grazer rather than predator. This discovery suggests that 1) naticids first appeared in mid-Cretaceous, 2) many Cretaceous and most of Jurassic "naticids" are not naticid, and 3) the Jurassic and Cretaceous did not feed on molluscs by shell drilling. Therefore, it appears that the fossil record of naticids and their predation traces are in harmony with each other. Our discovery supports a hypothesis that naticid predation appeared in mid-Cretaceous.2. We have shown that there are some boreholes similar to the incomplete drillholes by naticids. One example is the limpet home scars in the Cretaceous ammonites from Japan and Sakhaliin. Limpet home scars are produced by territorial and/or homing species by, means of Chemical dissolution, assisted by radular action. However, limpet home scars differ from the incomplete naticid drillholes in shape and size. Rediscovery of a Placenticeras meeki from South Dakota with many home scars and patellogastropod Limpets strongly suggests that the so-called mosasaur bite-marks are also home scars of patellogastropod limpets.3. We have shown that shell-elongation of marine snails is an example of anti-predatory adaptation agains naticids. Although this study is in progress, it is evident that elongate shell has more naticid drillholes than round ones.

1。基于对活化石蜗牛的解剖学研究，该蜗牛具有原始的神经系统，并具有许多淡水Ampullariid蜗牛常见的特征。同样，G。fluctuata是Grazer而不是捕食者。这一发现表明1）naticids首次出现在白垩纪中部，2）许多白垩纪和大多数侏罗纪“ naticids”不是naticid，而3）侏罗纪和白垩纪并没有通过壳钻孔以软体动物为食。因此，看来Naticids的化石记录及其捕食痕迹彼此和谐。我们的发现支持了一个假设，即naticid捕食出现在白垩纪中部2。我们已经表明，有些钻孔类似于Naticids的不完整钻孔。一个例子是来自日本和萨哈林的白垩纪氨的林木疤痕。 lig骨疤痕是由领土和/或归巢的物种，是由化学溶解的手段产生的。然而，lig骨的疤痕与形状和尺寸的不完整的鼻虫钻孔不同。重新发现了来自南达科他州的胎盘米基，其中有许多家庭疤痕和patelogastropod lim毛强烈表明，所谓的Mosasaur Bite-Marks也是patellogogastropod limpets.3。我们已经表明，海洋蜗牛的壳延长是抗侵蚀适应的一个例子。尽管这项研究正在进行中，但很明显，细长的壳比圆形的钻孔更多。