Therizinosaurids

Part of speech: noun

Definitions

1. A group of large, herbivorous theropod dinosaurs known for their long, curved claws and elongated necks; they are characterized by unusual skeletal features distinguishing them from other theropods
2. Members of a distinctive family of feathered dinosaurs exhibiting massive forelimbs with formidable claws and specialized teeth for plant-eating; these creatures possess unique evolutionary traits within the theropod lineage
3. A clade of prehistoric dinosaurs marked by their large, clawed hands, herbivorous diet, and birdlike features, representing an unusual branch of the primarily carnivorous theropods that adapted to a plant-based lifestyle

Etymology: "Therizinosaurids" is the plural of "therizinosaurid," a member of the family Therizinosauridae, named for the genus "Therizinosaurus." That genus name combines Greek "therizein," meaning "to reap" or "to cut," with "sauros," meaning "lizard," and it refers to the enormous scythe-like claws on the hands, which were first described from fossil claws found in Mongolia's Gobi Desert, long before the rest of the skeleton was known. The claws were so large that early researchers initially assumed they belonged to a giant turtle-like reptile. The family name follows the standard zoological pattern of a genus name with the suffix "-idae," which marks a family, and the English "-id" ending on "therizinosaurid" marks a member of that family. The plural form simply adds the English "-s," so the word names the whole group of these plant-eating theropods rather than a single animal.

Synonyms: therizinosaurids