Which Family sits immediately above the genus *Xenacanthus* in the taxonomic hierarchy?
Answer
Xenacanthidae
The classification structure places the genus *Xenacanthus* directly nested within the Family Xenacanthidae. This family represents a grouping of closely related genera within the broader, extinct shark Order Xenacanthiformes. The distinctions used to define members at the family level typically involve a combination of skull features, fin morphology, and the structure of the distinctive cranial spine shared among its members, placing *Xenacanthus* within this specific ancient shark clade before moving up to the Order level.

Related Questions
To which Class does the ancient shark genus *Xenacanthus* belong based on its skeleton?What distinctive anatomical feature defines the Order Xenacanthiformes?What is the approximate translation of the genus name *Xenacanthus*?What Phylum links *Xenacanthus* to other vertebrates possessing a notochord?What specialized environment were *Xenacanthus* fossils often found in, relating to its body plan?During which geological periods did the extinct Order Xenacanthiformes thrive?Which Family sits immediately above the genus *Xenacanthus* in the taxonomic hierarchy?Which alternative genus name has been used for reclassified Australian *Xenacanthus* specimens?What critical method confirms the placement of modern fish classes versus *Xenacanthus* classifications?What Kingdom classification is shared by *Xenacanthus* and nearly all recognizable animal life?What function is plausibly suggested for the cranial spine given *Xenacanthus*'s eel-like locomotion?