摘要:

This review of the family Loxoconchidae (Crustacea; Ostracoda) deals principally with six genera that have living representatives in European waters, including the Mediterranean and the Black Sea. These areLoxoconcha s.s., three genera recently established for species formerly placed inLoxoconcha (Lindisfarnia, SagmatocythereandBonnyannella),HirschmanniaandElofsonia.Revised diagnoses are given for these genera and their type‐species are fully illustrated together for the first time. In addition, comments are made on the stratigraphic ranges, world distribution and palaeoecological significance of each genus.Characters useful in the differentiation of these and other loxoconchid genera are discussed.More than 30 Recent European‘Loxoconcha’species are considered on the basis of published descriptions and illustrations. They are re‐assigned to other genera where necessary, as are a number of fossil

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1984.tb02557.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

摘要:

Fifteen species of fiddler crabs are reported for eastern North America between Massachusetts and Quintana Roo, Mexico. Thirteen occur in the United States and 11 in Mexico, with eight in common to the two countries. Of 13 species in the Gulf of Mexico, five are endemic and a sixth is restricted largely to the peninsulas of Florida and Yucatan. The status ofU. rapaxin the northern Gulf remains to be resolved. Range limits of most species approximate one or the other of two sets of intersecting thermal and geological boundaries that subdivide the Gulf of Mexico along north‐south and east‐west axes. Species belonging to subgenusMinucatend to replace one another at the thermally‐controlled Carolinian‐Caribbean marine biotic boundary across the Florida peninsula and northern Gulf. However, onlyU. minaxof all the North American fiddler crabs exhibits the classical disjunct Carolinian distribution, and this appears basically to reflect the discontinuous distribution of temperate salt marshes that are the habitat of the species. Distributions of species belonging to subgenusCelucaadhere for the most part to the subdivision of the Gulf into western terrigenous and eastern carbonate sedimentary provinces. The northern transition occurs in the vicinity of Apalachee Bay and the southern at Laguna de Terminos. A third distributional pattern is shown byU. subcylindrica, a specialized endemic species of the hypersaline Laguna Madre system of the western Gulf. The level of endemism in the fiddler crabs is relatively high in comparison with that of other marine groups within the Gulf of Mexico. This may be a consequence of the adaptations of fiddler crabs as specialized deposit feeders to regional differences in climatic and edaphic characteristics of a marginally marine upper shore habitat. The distributional patterns of the endemics could prove useful in reconstructing palaeoecological events of evolutionary significance within the Gulf of

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1984.tb02558.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1984.tb02557a.x

出版商:Blackwell Publishing Ltd    

年代:1984

数据来源: WILEY