CACTODERA-SALINA N. SP. FROM THE ESTUARY PLANT, SALICORNIA-BIGELOVII,IN SONORA, MEXICO

Cactodera salina n. sp. (Heteroderinae) is described from roots of the estuary plant Salicornia bigelovii (Chenopodiaceae), in Puerto Penasc o, Sonora, Mexico, at the northern tip of the Sea of Cortez. The halop hyte host is grown experimentally for oilseed in plots flooded daily w ith seawater. Infected plants appear to be adversely affected by C. sa lina relative to plants in noninfested plots. Cactodera salina extends the morphological limits of the genus. Females and cysts have a very small or absent terminal cone and deep cuticular folds in a zigzag pat tern more typical of Heterodera and Globodera than of Cactodera spp. M any Cactodera spp. have a tuberculate egg surface, whereas C. salina s hares the character of a smooth egg with C. amaranthi, C. weissi, and C. acnidae. Only C. milleri and C. acnidae have larger cysts than C, s alina. Face patterns of males and second-stage juveniles, as viewed wi th scanning electron microscopy, reveal the full complement of six lip sectors as in other Cactodera slip. Circumfenestrae of C. salina are typical for the genus.