Holland Nicholas D, Wilson Nerida G
Division of Marine Biology, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 22093-0202, USA.
J Parasitol. 2009 Oct;95(5):1215-7. doi: 10.1645/GE-1946.1. Epub 2009 Apr 14.
Dwarf razor clams (Ensis minor) in the Gulf of Mexico are known to be infected with plerocercoid larvae of a tetraphyllidean tapeworm. Here, we show that these larvae live unencysted in the intestinal lumen of the clam. Morphologically, the larvae are similar to (although significantly larger than) tapeworm larvae previously described living in the gut of amphioxus (Branchiostoma floridae) from the same habitat. Sequence data from the D2 region of the 28S rDNA from clam-infecting larvae were identical to the sequence of Acanthobothrium brevissime isolated as larvae from amphioxus and as adults from a stingray (Dasyatis say). The sequence data leave little doubt that the dwarf razor clam and the amphioxus are alternative intermediate hosts in the life cycle of A. brevissime.
已知墨西哥湾的侏儒剃刀蛤（Ensis minor）感染了一种四叶目绦虫的裂头蚴幼虫。在此，我们表明这些幼虫在蛤的肠腔内无包囊存活。从形态学上看，这些幼虫与先前描述的生活在同一栖息地文昌鱼（佛罗里达文昌鱼）肠道中的绦虫幼虫相似（尽管明显更大）。感染蛤的幼虫的28S rDNA D2区域的序列数据与从文昌鱼幼虫和黄貂鱼（Dasyatis say）成虫中分离出的短棘棘头绦虫（Acanthobothrium brevissime）的序列相同。序列数据无疑表明侏儒剃刀蛤和文昌鱼是短棘棘头绦虫生命周期中的替代中间宿主。
