Why didn't you just do a search on Reefland? Here is a reply I posted on Reefland in April 2004:Originally Posted by saltjunkie
Information on Ilyanassa obsoleta:
Ilyanassa obsoleta is the valid classification. The synonym Nassarius obsoletus is invalid and has been for decades.
This mudsnail is native to the western Atlantic from Nova Scotia to northern Florida. It was transported to San Francisco Bay in 1907 and it is now extremely abundant there. In fact, it is the dominant mudflat gastropod in San Francisco Bay (Nichols & Thompson, 1985b). Carlton (1979a) suggests that it was probably introduced there on Atlantic oysters between 1901 and 1907. Atlantic oysters were cultivated in Alameda (SF Bay).
From San Francisco Bay it has spread north as far as British Columbia.
It has been intensively studied in the Atlantic where it has been shown to have significant effects on mudflat community structure and sediment composition (Grant, 1965; Sibert, 1968).
Grodhaus and Keh (1959) found it to harbor five species of trematode flatworms, including the schistosome Austrobilharzia variglandis which is responsible for "swimmers' itch."
Race (1979, 1982) demonstrated competitive displacement and predation of the native hornsnail Cerithidea californica.
Interesting threads on this topic:
http://reefcentral.com/forums/showth...light=obsoleta
http://reefcentral.com/forums/showth...light=obsoleta
http://reefcentral.com/forums/showth...light=obsoleta
http://reefcentral.com/forums/showth...light=obsoleta
Nassarius spp. snails became popular for reef tanks with deep sand beds a few years back when Dr. Ron Shimek wrote an article recommending them. He was talking about true Nassarius, such as Nassarius vibex that are commonly available from the Florida Keys. True Nassarius snails do not eat algae and they are not predatory; they are scavengers that eat only carrion and meaty detritus.
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