Through the process described in the Approach chapter, 452 Species of Greatest Conservation Need (SGCN) have been identified in New Mexico (Table 4-1). Of these 298 species are fish, birds, mammals, amphibians, reptiles, molluscs, and crustaceans. The remaining 154 species are arthropod species in the classes of Insecta, Arachnida, Chilopoda, Diplopoda, and Entognatha. Although the percent of New Mexico's biodiversity represented as SGCN is unknown (the amount of arthropods other than crustaceans in New Mexico is unknown), approximately 26% of New Mexico's vertebrate, mollusc, and crustacean fauna are considered SGCN (Table 4-2). Most of the crustacean fauna (91%; 32 species) in the state are considered SGCN. Conversely, only 15% (74 species) of the birds in the state are considered SGCN. Although little is known about most arthropods in New Mexico, the arthropod working group considers those species designated as SGCN to be appropriate for conservation planning at this time. However, additional taxa may be identified in the future as new information becomes available. Arthropod SGCN (classes Insecta, Arachnida, Chilopoda, Diplopoda, and Entognatha) identified to date represent potentially declining species, and taxa that are considered indicative of the health and diversity of New Mexico's varied landscapes, habitats, and natural heritage. Additional information is needed to fully understand the status of these species in New Mexico.