Littoraria appears to be a genus.  I Googled the name and found this as one
of the choices.
http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN
<http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&searc
h_value=567035> &search_value=567035

Re: your second question - same place, ITIS
http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN
<http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&searc
h_value=70394> &search_value=70394

  _____

From: Olivier Caro [mailto:[log in to unmask]]
Sent: Tuesday, October 25, 2005 12:31 AM
To: [log in to unmask]
Subject: Re: Florida Nodilittorina


By the way, what is the level-value of Littoraria : genus, subgenus ?
And, more generally...
Any reliable resource somewhere regarding the syst. of Littorinidae ? (pdf,
html, doc, xls...)

Cheers

Olivier Caro