Be sure to review Echinolittorina of Florida for full explanation for obsolete and current names of species found in Florida.  Ref: Reid, D.G., 2009. The genus Echinolittorina Habe, 1956 (Gastropoda: Littorinidae) in the western Atlantic Ocean. Zootaxa 2184: 1-103. Aug. 6. 

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Based upon Reid's work, we have four similar

Echinolittorina, now in subgenus Amerolittorina,

in Florida to deal with, as follows:

  E. angustior (Mörch, 1876)

  E. jamaicensis (C. B. Adams, 1850)

      [formerly E. riisei (Mörch, 1876)]
  E. placida Reid, 2009

      [formerly E. interrupta (C. B. Adams in Philippi, 1847)]

  E. ziczac (Gmelin, 1791)