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18 status at this time is unknown, and studies should be undertaken,to determine its abundance and distribution. Lepidomeda albivallis: White River Spinedace The spinedace is confined to several springs in the vicinity of Preston and Lund. Their population status is unknown at this time, although collections made in October of 1979 produced very few individuals. It is considered rare in all habitats. Exotics are widespread in all springs and are undoubtedly responsible for their reduced numbers. The deployment of the MX missile in this valley poses a serious threat to this species. In view of the low numbers throughout its entire rante, it should be listed as threatened or endangered. Lepidomeda mollispinis pratensis: Panaca Spinedace This subspecies was thought to be extinct until personnel from the Nevada Department of Wildlife found a few individuals in Condor Canyon in late 1978. Efforts should be made to establish a refugium for this subspecies and have it listed as endangered. Little or nothing is known of the life history of this animal, and field observations should be undertaken to establish needed infor- mation. Lepidomeda m. mollispinis: Virgin River Spinedace The spinedace in the Virgin River is found mainly in those reaches of the river in Utah and Arizona. Lepidomeda (as does Gila robusta seminuda) prefers deeper water and apparently orients below clear water inflows of the tributaties. The animal is not considered too abundant although a few instances are known where large numbers of specimens were collected. The same general threats as those listed under G.r. seminuda apply here. Moapa coriacea: Moapa dace This species is confined to the first two miles of the headwaters of the Moapa River. It has experienced severe decline in numbers over the past several years as a result of exotic fish introductions and habitat alterations. Recently a refuge was established in the headwaters, and efforts to reintroduce the fish are underway. Life history studies are underway at the University of Nevada at Las Vegas and should be completed in the spring of 1980. Serious threats are posed by the MX missile project and the continued use of water for agricultural and industrial purposes. Pantosteous clarki: Desert Sucker This animal is currently very rare in all habitats in the White River Valley and is in serious danger of extinction in this area due to exotic fishes and loss of habitat. The populations in the Meadow Valley Wash area are of unknown status, and field work is needed in order to make any further deter- minations. The sucker is not extremely common in the Virgin River and is most abundant in those reaches in Utah and Arizona. Further studies are needed on this animal in view of the threats present to all of its habitats. Special concern or threatened status is recommended. Plagopterus argentissimus: Woundfin This species continues to hold out in the face of major habitat alterations