Final answer:
The lobe-fin clade consists of Australian lungfishes, African lungfishes, coelacanths, and tetrapods, but not chondrichthyans.
Step-by-step explanation:
The lobe-fin clade consists of several species, including chondrichthyans (sharks, rays, skates, and ghost sharks), Australian lungfishes, African lungfishes, coelacanths, and tetrapods (amphibians, reptiles, mammals). Based on the given information, all of the options mentioned belong to the lobe-fin clade, except for chondrichthyans, which belong to the clade Chondrichthyes and have a skeleton made of cartilage. The other options, Australian lungfishes, African lungfishes, coelacanths, and tetrapods, are all part of the lobe-fin clade.