A new genus and three new species of alpheid shrimps (Crustacea, Decapoda, Caridea) from the tropical American coasts Author Anker, Arthur text Zootaxa 2010 2652 47 63 journal article 10.5281/zenodo.198863 6f286e35-670c-4bb9-920b-604c51cecd9f 1175-5326 198863 Key to the presently known species of Triacanthoneus n. gen. 1. Dorsolateral teeth of carapace situated only slightly anterior and ventral to mediodorsal tooth; orbital teeth present; dorsal spiniform setae of telson small, both situated in posterior half of telson; cheliped ischia with two spiniform setae [Western Atlantic: Gulf of Mexico ] .................................................................. Triacanthoneus alacranes n. sp. - Dorsolateral teeth of carapace situated distinctly anterior and more ventral to mediodorsal tooth; orbital teeth absent; dorsal spiniform setae of telson strong, anterior pair situated in anterior half of telson; cheliped ischia with three spiniform setae ............................................................................................................................................................. 2 2. Major chela with fingers shorter than palm; subapical dent of rostrum directed ventrally; mediodorsal tooth distinctly posterior to mid-length of carapace [Eastern Pacific: Panama , Colombia ] ....... Triacanthoneus pacificus n. sp. - Major chela with fingers longer than palm; subapical dent of rostrum directed anteriorly; mediodorsal tooth slightly posterior to mid-length of carapace [Western Atlantic: Caribbean Sea] ............................... Triacanthoneus toro n. sp.