01293nas a2200157 4500008004100000245019200041210006900233300001200302490000800314520069400322653001101016653001401027100002201041700002401063856004801087 2000 eng d00aRevision of the subterranean amphipod genus Spelaeogammarus (Bogidiellidae) from Brazil, including descriptions of three new species and considerations of their phylogeny and biogeography0 aRevision of the subterranean amphipod genus Spelaeogammarus Bogi a104-1230 v1133 a

Three new subterranean amphipods of the genus Spelaeogammarus da Silva Brum, 1975, are described from eastern Brazil, bringing the total number of species in the genus to four. Based on the examination of type-material of Spelaeogammarus bahiensis, a comparative diagnosis of all four species of Spelaeogammarus. including the new species Spelaeogammarus spinilacertus, Spelaeogammarus trajanoae, and Spelaeogammarus santanensis, is given. A diagnosis for the genus is also provided. The occurrence of these species in caves that are separated from each other in discontinuous karst areas is biogeographically significant for the family Bogidiellidae in continental South America.

10aBrazil10aphylogeny1 aKoenemann, Stefan1 aHolsinger, John, R. uhttps://bogidiellids.myspecies.info/node/1201587nas a2200145 4500008004100000245017100041210006900212300000900281490000600290520105600296653001001352653000801362100002401370856004701394 1992 eng d00aFour new species of subterranean amphipod crustaceans (Artesiidae, Hadziidae, Sebidae) from Texas, with comments on their phylogenetic and biogeographic relationships0 aFour new species of subterranean amphipod crustaceans Artesiidae a1-220 v33 a

Four new stygobiont amphipod crustaceans are described from a variety of groundwater habitats (e.g., caves, springs, interstitial media) in south-central and western Texas. The new species are Artesia welbourni (Artesiidae), Holsingerius smaragdinus (Hadziidae), Mexiweckelia hardeni (Hadziidae), and Seborgia hershleri (Sebidae). The new locality records for Artesia in Culberson County, and Holsingerius and Seborgia in Val Verde County are the first for these genera outside the artesian well in San Marcos, Texas, whereas the new record for Mexiweckelia in Medina County documents a significant range extension for this genus from north-central Mexico to south-central Texas. Seborgia relicta, previously described from the artesian well in San Marcos, is also newly recorded from Medina County. Both the phylogenetic and biogeographic implications of these new taxa are discussed at some length because they provide further insight into the origin and evolutionary biology of stygobiont crustaceans in southern Texas and northern Mexico.

10aTexas10aUSA1 aHolsinger, John, R. uhttps://bogidiellids.myspecies.info/node/901901nas a2200157 4500008004100000245007600041210006900117300000900186490000800195520143200203653001001635653000801645100002401653700001901677856004701696 1980 eng d00aThe subterranean amphipod crustacean fauna of an artesian well in Texas0 asubterranean amphipod crustacean fauna of an artesian well in Te a1-620 v3083 a

Subterranean amphipod crustaceans of the suborder Gammaridea have been sampled on a regular basis from the artesian well in San Marcos, Texas, since late 1973. Water in the artesian well comes from the extensive, subterranean Edwards Aquifer, which is associated with the Balcones Escarpment and Fault Zone of south-central Texas. The taxonomically diverse amphipod fauna of the well is believed to be one of the richest of its kind in the world and is composed of five families, six genera, and 10 species. One family, four genera, and six species are newly described herein. Four distinct phylogenetic lineages are represented in the amphipod fauna: crangonyctids, hadzioids, bogidielloids, and sebids.
The zoogeographic and ecological implications of the artesian well amphipod fauna are profound. Approximately 80 percent of the species have obvious affinities with marine or brackish water species and are presumably derivatives of marine ancestors that colonized newly opened freshwater habitats during recession of epeiric seas in the Late Cretaceous. The high taxonomic diversity of the amphipod fauna is probably explained by: (1) exposure of south-central Texas to an extensive marine embayment during the Cretaceous period, (2) complex geological structure of the Balcones Fault Zone and large size of the Edwards Aquifer, and (3) ecological complexity of aquatic communities in the Edwards Aquifer.

10aTexas10aUSA1 aHolsinger, John, R.1 aLongley, Glenn uhttps://bogidiellids.myspecies.info/node/8