01571nas a2200145   4500008004100000245016700041210006900208300001000277490000900287520105100296100001401347700001301361700001701374856003401391       2007                        eng d00aRevision of the Alpheus nuttingi (Schmitt) species complex (Crustacea : Decapoda : Alpheidae), with description of a new species from the tropical eastern Pacific0 aRevision of the Alpheus nuttingi Schmitt species complex Crustac  a41-600 v15773 aThe Alpheus nuttingi (Schmitt, 1924) species complex consists of three species. The only western Atlantic species, A. nuttingi, occurs from the southeastern United States to Brazil. The two eastern Pacific species are A. galapagensis Sivertsen, 1933 ( synonyms: A. canalis Kim & Abele, 1988; A. cryptodentatus Christoffersen & Ramos, 1988), which occurs from the Gulf of California to Colombia and Galapagos, and A. millsae, n. sp., presently known only from a few localities in Panama. The three species differ morphologically, genetically, and in color pattern. The two eastern Pacific species both can be found in the intertidal, but A. millsae, n. sp. occurs slightly deeper, suggesting the possibility of ecological speciation. All evidence shows that A. nuttingi and A. millsae, n. sp. are transisthmian sister species, with A. galapagensis forming their sister clade. Genetic differentiation between the transisthmian sister species suggests a divergence time of approximately 6 mya, well before the final closure of the Isthmus of Panama.1 aAnker, A.1 aHurt, C.1 aKnowlton, N.  u<Go to ISI>://00024927570000502798nas a2200145   4500008004100000245015600041210006900197300000900266490000900275520229000284100001402574700001302588700001702601856003402618       2007                        eng d00aThree transisthmian snapping shrimps (Crustacea : decapoda : alpheidae : Alpheus) associated with innkeeper worms (Echiura : Thalassematidae) in Panama0 aThree transisthmian snapping shrimps Crustacea decapoda alpheida  a1-230 v16263 aThe present study deals with three species of Alpheus, including two new species, living symbiotically in burrows of innkeeper worms ( Echiura: Thalassematidae) on the tropical coasts of the western Atlantic and eastern Pacific Oceans. Alpheus christofferseni n. sp. is described on the basis of four specimens from Atol das Rocas, northwestern Brazil, and one specimen from Bocas del Toro, Caribbean coast of Panama. All specimens of this species were collected with suction pumps from burrows on intertidal or shallow subtidal sandflats; the Panamanian specimen was collected together with its echiuran host, Ochetostoma cf. edax ( Fisher, 1946). Alpheus naos n. sp. is described on the basis of a single specimen found together with its host, Listriolobus sp., under large intertidal mud-covered rocks of Punta Culebra, Isla Naos, Pacific coast of Panama. Finally, two specimens of Alpheus aequus Kim & Abele, 1988 were collected together with their hosts, Ochetostoma edax, in the mixed rock-sand-mud intertidal of Coiba, Pacific coast of Panama. Remarkably, these three species are nearly identical in morphology and are also similar in color patterns. However, despite their morphological and ecological similarities, they are among the most genetically distinct of transisthmian alpheid geminate taxa examined to date. Genetic analyses suggest that A. aequus and A. naos n. sp. form an eastern Pacific clade whose sister taxon is the slightly more distantly related western Atlantic A. christofferseni n. sp. Estimated divergence times are similar to 10 mya for the two eastern Pacific species, and similar to 11-12 mya for the western Atlantic and eastern Pacific clades. Within Alpheus, A. christofferseni n. sp., A. aequus and A. naos n. sp. belong to the pantropical A. barbatus Coutiere, 1897 species complex ( A. barbatus clade), which also includes the eastern Atlantic A. ribeiroae Anker & Dworschak, 2004 and the Indo-West Pacific A. barbatus. The association of all three American species with thalassematid echiurans, as well as previous reports of associations between A. barbatus and echiurans in the western Pacific, suggest that this symbiosis is relatively ancient, having evolved in the ancestor of the A. barbatus clade ( at least 12 mya and probably earlier).1 aAnker, A.1 aHurt, C.1 aKnowlton, N.  u<Go to ISI>://00025060160000101530nas a2200133   4500008004100000245016700041210006900208300000900277520103200286100001401318700001301332700001701345856003401362       2009                        eng d00aDescription of cryptic taxa within the Alpheus bouvieri A. Milne-Edwards, 1878 and A. hebes Kim and Abele, 1988 species complexes (Crustacea: Decapoda: Alpheidae)0 aDescription of cryptic taxa within the Alpheus bouvieri A MilneE  a1-233 aAlpheus bouvieri A. Milne-Edwards, 1878 and A. hebes Kim and Abele, 1988 are reviewed based on morphological and genetic data. Alpheus bouvieri, previously believed to be distributed in the eastern Pacific and Atlantic, is restricted to the Atlantic populations; the eastern Pacific populations (A. bouvieri sensu Kim and Abele 1988) are assigned to A. javieri n. sp. A second new species, A. agilis n. sp., closely related to the eastern Pacific A. hebes, is described based on recently collected specimens from the eastern Atlantic (Sao Tome, Cape Verde) and western Atlantic (Atol das Rocas off northeastern Brazil). The absence of A. agilis n. sp. (or any other representative of the A. hebes clade) in the Caribbean Sea is likely due to a relatively recent (similar to 1-2 my) extinction. Genetic data (COI sequences) indicates that A. bouvieri and A. javieri n. sp., and A. hebes and A. agilis n. sp. diverged approximately 6 and 7.5 mya, respectively, i.e., around 3 my before the final closure of the Isthmus of Panama.1 aAnker, A.1 aHurt, C.1 aKnowlton, N.  u<Go to ISI>://00026780330000101690nas a2200157   4500008004100000245015300041210006900194300001000263490000900273520115500282100001401437700001301451700001701464700001701481856003401498       2008                        eng d00aRevision of the Alpheus cylindricus Kingsley, 1878 species complex (Crustacea: Decapoda: Alpheidae), with revalidation of A. vanderbilti Boone, 19300 aRevision of the Alpheus cylindricus Kingsley 1878 species comple  a53-680 v19433 aAlpheus cylindricus Kingsley, 1878, previously believed to be widely distributed in the tropical eastern Pacific and western and eastern Atlantic, is revised. Two species are recognized based on morphology, color pattern and genetics. Alpheus cylindricus is restricted to the tropical eastern Pacific, from the Gulf of California to the Galapagos. A neotype of A. cylindricus from the type locality, Las Perlas Islands, is designated. On the Pacific coast of Panama, this species commonly inhabits purple sponges growing among or under large intertidal rocks. Alpheus vanderbilti Boone, 1930 is formally resurrected from the synonymy of A. cylindricus; it occurs in the tropical western Atlantic, from Bermuda to Brazil, and in the tropical eastern Atlantic, around the islands of the Gulf of Guinea. In the Caribbean, A. vanderbilti is most often encountered in large loggerhead sponges, Spheciospongia vesparia (Lamarck, 1814), while in the Gulf of Guinea it inhabits sponge-lined tunnels in coral rocks. Complete synonymies and GenBank barcodes (COI) are provided. Phylogeography of the A. cylindricus complex is discussed based on molecular data.1 aAnker, A.1 aHurt, C.1 aJara, J., A.1 aKnowlton, N.  u<Go to ISI>://00026145400000401676nas a2200145   4500008004100000245019500041210006900236300000900305490000900314520112900323100001401452700001301466700001701479856003401496       2008                        eng d00aRevision of the Alpheus formosus Gibbes, 1850 complex, with redescription of A-formosus and description of a new species from the tropical western Atlantic (Crustacea : Decapoda : Alpheidae)0 aRevision of the Alpheus formosus Gibbes 1850 complex with redesc  a1-220 v17073 aThe Alpheus formosus Gibbes, 1850 complex is revised based on materials from the eastern Pacific and western Atlantic. Three species are recognized: Alpheus panamensis Kingsley, 1878 in the eastern Pacific, ranging from the Gulf of California to the Galapagos Archipelago; A. formosus Gibbes, 1850 (synonym: A. poeyi Guerin Meneville, 1857) in the western Atlantic, ranging from North Carolina and throughout the Caribbean to southern Brazil; and A. paraformosus n. sp., presently known only from the southwestern Caribbean (Panama) in the western Atlantic. Alpheus paraformosus n. sp. differs from A. formosus and A. panamensis by the distinctly shorter rostral furrows, the absence of balaeniceps setae on the fingers of the minor chela, and also several subtle but discrete features in the color pattern. Alpheus formosus is redescribed based on recently collected material. A female specimen from Florida Keys is designated as neotype of A. formosus. Morphology, color and genetics all suggest that A. formosus and A. panamensis are transisthmian sister species, with A. paraformosus n. sp. being their nearest relative.1 aAnker, A.1 aHurt, C.1 aKnowlton, N.  u<Go to ISI>://00025342380000101232nas a2200145   4500008004100000245015200041210006900193300001000262490000900272520072700281100001401008700001301022700001701035856003401052       2008                        eng d00aRevision of the Alpheus websteri Kingsley, 1880 species complex (Crustacea : Decapoda : Alpheidae), with revalidation of A. arenensis (Chace, 1937)0 aRevision of the Alpheus websteri Kingsley 1880 species complex C  a51-680 v16943 aThe Alpheus websteri Kingsley, 1880 species complex is revised. Alpheus websteri s. str. is redefined and restricted to the western Atlantic, ranging from the type locality in the Florida Keys to northeastern Brazil. The eastern Pacific A. arenensis (Chace, 1937), formerly a synonym of A. websteri, and the eastern Atlantic A. fagei Crosnier and Forest, 1966, are shown to be distinct from A. websteri morphologically, genetically and also by color pattern. Morphology, genetics and color patterns all suggest that A. websteri and A. arenensis are transisthmian sister species, with A. fagei being their closest relative. Complete synonymy, color photographs and GenBank barcodes (COI) are provided for all three species.1 aAnker, A.1 aHurt, C.1 aKnowlton, N.  u<Go to ISI>://000252777000003