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&search_value=567035
Re: your second question - same place, ITIS
http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&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