Frequently Asked Questions
The most-asked questions about dinosaur families.
What is this site and who is it for?
It is an unofficial, fan-maintained reference that organizes and explains dinosaur family-level taxonomy (the groups ending in "-idae") for readers who want to go beyond individual species names and see how they cluster together.
What counts as a "family" in dinosaur taxonomy?
A family is a formal rank that bundles one or more closely related genera thought to descend from a shared ancestor, sitting between the broader order level and the narrower genus level.
Where should a beginner start reading?
Start with the two major hip-based clades—Saurischia and Ornithischia—then work down through their superfamilies into the individual families nested beneath each.
Roughly how many dinosaur families are recognized?
Depending on how current literature splits or lumps genera, paleontologists generally acknowledge somewhere between 40 and 60 distinct families across all Mesozoic dinosaurs.
Which families are the "headliners" most fans know?
Tyrannosauridae, Hadrosauridae, Triceratopsidae, Stegosauridae, and Spinosauridae are the names that appear most frequently in popular media and casual discussion.
How does a dinosaur family get its name?
By convention the family name is built from the stem of its type genus plus the suffix "-idae," so the type of Tyrannosauridae is the genus Tyrannosaurus.
Do family assignments ever change?
Yes; as new fossils are described and phylogenetic analyses are rerun, genera can be shuffled between families, meaning a once-stable grouping may be split, merged, or renamed over time.
What is the practical difference between a family and a genus?
A genus (e.g., Velociraptor) is the rank you see in a binomial species name, while a family (e.g., Dromaeosauridae) is the broader bucket that holds several related genera together.
Can a family contain only a single genus?
Absolutely—monotypic families are common in dinosaur taxonomy, especially among rarer or less-studied lineages where only one genus has been formally assigned to the group.
Is this encyclopedia a peer-reviewed scientific source?
No; it is a fan-curated reference designed to make family-level taxonomy approachable, and readers should consult primary literature or databases such as the Paleobiology Database for citable data.