Great amplexus-pictures, Mark. I hate to be a smart alec , one small correction however. The amplexus in e.g. Pleurodeles and Tylototriton differs from that of Notophthalmus and Taricha. In the "New World-amplexus" hind legs or even all four legs might be involved with the male clasping from above (!). Any more pics anybody??? I'll look through mine.
A question to all of you native English speakers. Is the clasping of the male toad (Bufo) as part of the mating behaviour also called amplexus?
Pectoral or Axillary: The male's forelimbs encircle the female's chest just below her forelimbs
Pelvic or Inguinal: The male's forelimbs encircle the female's waste just above her hindlimbs
Cephalic: The males's forelimbs encircle the female's head and the upper surfaces of his hands are pressed against her chin.
Taricha use pectoral amplexus and Notopthalamus use cepahlic, at least according to a reference in A Natural History of Amphibians by Stebbins and Cohen.