suggested, that the Trophotaenia may have been lost secondarily, but only in 1989, Lombardi et al. Later Turner stated (1940), that embryos clearly must absorb nutritents by other means. This is the only species of Splitfins, where fry does not develop Trophotaenia, therefore it was thought by Hubbs and Turner (1939) to be the most basal species of Goodeids. The group concentrated on the clear outflow of the spring, where Ataeniobius toweri was found again hiding under leaves of waterlilies or between patches of submerse vegetation. ![]() In 2017, another group surveyed a spring called Charco Azul south of Río Verde town, a middle sized clear spring, also used for recreation. It avoided the swift flowing outflow from the spring as well as the shallow ponds. The Bluetail Splitfin was found in the channels in small groups under the leaves of waterlilies and between reed stems. The current was moderate to swift and the water temperature about 26☌. This is a swampy field with channels and ponds, built by the outflow of a small spring used for recreation. On a survey in 2015, the GWG went to an El Aguaje called area near Villa Juarez. The clear water smells strongly sulfurous and the temperature ranges between 26° and 30☌. Water from two caves forms a catchment area or reservoir that the natives call a lagoon. It includes an area with several warm springs and is located about 10km southwest of the city of Río Verde. ![]() A typical habitat is the Media Luna laggon. The substrate is made of flocculent silt, mud, sand, gravel and rocks. Typical vegetation associated with the Bluetail Splitfin are species of Nymphaea, Scirpus, Juncus and Eichhornia and green algae. It prefers depths to 1m with the water very clear, but it may also be a bit murky. It can be found along shallow margins of lagoons, marshes and ditches, but also in creeks where currents may be moderately strong. The left map shows the Río Tamuín basin from the Hydrographic Region Pánuco on a Mexico map. Within the Río Tamuín basin, the Bluetail Splitfin is restricted to the Río Verde subbasin (VER), shown on the right map:Ītaeniobius toweri lives typically in quiet water with little or no current. No differences strong enough occur in Ataeniobius toweri to allow us to distinguish different ESU's, so all fish belong to Atato1. ESU's can be defined by Molecular genetics, Morphology and/or Zoogeography and help in indicating different phylogenetic lineages within a species. The abbreviation for an ESU is composed of three letters of the genus, followed by the first two letters of the species name and an ongoing number in each species. Each unit expresses an isolated population with different genetic characteristics within one species. The bold names are the ones officially used by the Instituto Nacional de Estadística y Geografía nevertheless, other ones might be more often in use or better known and therefore prefered.ĮSU ist short for Evolutionarily Significant Unit. ![]() Few springs S of Río Verde drain directly into the river of the same name (e.g. It inhabits several thermal springs and outlets S of the town of Río Verde, draining into the Arroyo Santa Rita (like the Lago Manantial de la Media Luna), a tributary of the Río Las Calabazas that lateron merges into the Río Verde, and several springs and outlets N of the town of Río Verde, draining into the Río Choy and the Canal Acequia Gigantal, both affluents of the Río Verde as well. The Bluetail Splitfin is endemic to the Mexican federal state of San Luis Potosí and part of the Río Verde fish fauna.
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