Island Night Lizards: Santa Barbara Island

Xantusia riversiana, Island Night Lizard
©2008 William Flaxington

Island Night Lizard: Santa Barbara Island

Island Night Lizard (Xantusia riversiana), endemic to the California Channel Islands where it is found only on Santa Barbara Island and adjacent Sutil Rock, and on San Nicolas and San Clemente islands — islands lacking snakes. Undisturbed rocks and vegetative cover are important in providing shelter and refuge for this species. Individuals may live into their teens. Females do not mature sexually until their third or fourth year, and they reproduce only every other year. Island night lizards are larger than their cousin species of desert night lizards. About 30% of their diet consists of vegetable material. The San Clemente Island population is considered a recognized subspecies (ssp. reticulata). Recent research indicates that Island night lizards have a very limited home range, and travel no more than 50 feet over a one-year period. Island Night Lizards are considered a threatened species.


ISLAND COLLECTOR INSTITUTION DATE NUMBER SPECIMEN
Santa Barbara Island Joseph Grinnell MVZ May 15, 1897 MVZ-644 Xantusia riversiana Herps
Santa Barbara Island Joseph Grinnell MVZ May 18, 1897 MVZ-645 Xantusia riversiana Herps
Santa Barbara Island J. R. Pemberton SDNHM August 4, 1933 SDNHM-21128 Xantusia riversiana Herps
Santa Barbara Island Theodore Reddick SDNHM June 16, 1939 SDNHM-31983 Xantusia riversiana Herps
Santa Barbara Island Theodore Reddick SDNHM June 16, 1939 SDNHM-31984 Xantusia riversiana Herps
Santa Barbara Island Theodore Reddick SDNHM June 16, 1939 SDNHM-31985 Xantusia riversiana Herps
Santa Barbara Island R. C. Banks SDNHM February 21, 1963 SDNHM-44469 Xantusia riversiana Herps