GASTROINTESTINAL HELMINTHS OF 5 HORNED LIZARD SPECIES, PHRYNOSOMA (PHRYNOSOMATIDAE) FROM ARIZONA

Five species of homed lizards of the genus Phrynosoma from Arizona wer e examined for gastrointestinal helminths. Phrynosoma cornutum (N = 7) and Phrynosoma solare (N = 8) harbored the cestode Diochetos phrynoso matis and the nematodes Atractis penneri and Skrjabinoptera phrynosoma . Phrynosoma douglassii (N = 19) and Phrynosoma platyrhinos (N = 5) co ntained both species of nematodes, whereas Phrynosoma modestum (N = 5) harbored only S. phrynosoma. Phrynosoma cornutum and P. douglassii ar e new hosts for A. penneri; P. modestum is a new host for S. phrynosom a. It appears that gastrointestinal helminths of Arizona homed lizards are restricted to 3 species. Diochetos parvovaria is placed in synony my with D. phrynosomatis.