The snapping shrimp genus Alpheus from the eastern Pacific (Decapoda, Caridea, Alpheidae)

Evidence for Three Major Clades within the Snapping Shrimp Genus Alpheus Inferred from Nuclear and Mitochondrial Gene Sequence Data

“…Genetic analysis of the three independent loci and preliminary data for a fourth (glutamine synthetase; S. T. Williams, unpublished) consistently revealed three major clades in Alpheus; although a formal re- (Kim and Abele, 1988) were usually assigned to the same molecular clade (Table 1). Clade I broadly corresponds to shrimp without ocular spines, which includes all members of four morphological species groups plus one lineage within a fifth species group.…”

“…Smaller collections came from Brazil, the Cape Verde Islands, and the Chagos Archipelago (see Table 1 and figure legends); for the latter two locations we have only COI sequences because frozen samples were not available for RNA extraction. Two species of shrimp currently belonging to the genus Thunor were also included to clarify their status, since in the past they have been described as Alpheus (Kim and Abele, 1988), and earlier genetic studies suggest that they should be included in Alpheus (Knowlton and Weigt, 1998). Table 1 and Fig.…”

“…Purified products were cloned into JM109 cells with the pGEM-T Easy Vector System II (Promega) following manufacturer's instructions. Individual bac- Kim and Abele (1988) as follows: Group 1, macrocheles or megacheles group; Group 2, sulcatus or machrochirus group; Group 3, obesomanus group; Group 4, crinitus group; Group 5, diadema or insignis group; Group 6, brevirostris group; and Group 7, edwardsii group. Locality abbreviations: Carib., Caribbean coast of Panama; E.…”

“…However, existing taxonomic treatments simply divide Alpheus into five or seven informal, broadly distributed species groups that date back to the work of Coutière (1905). These groups are poorly defined, with many morphological exceptions imbedded within them, and have no true systematic status (Kim and Abele, 1988).…”

Decapod Crustaceans and Pycnogonids of Rocas Alijos

“…Alpheus paracrinitus Miers, 1881: smoothclaw snapping shrimp Reported Range: Pantropical; eastern Pacific from southern Gulf of California to Galapagos (Kim and Abele, 1988 (Wicksten, 1983(Wicksten, ,1990). Location at Rocas Alijos: Ridge north of North Rock, under rock, 33 m, 15 Feb., 1993 one specimen.…”