Mid 19th century; earliest use found in William Carpenter (1813–1885), biologist and university administrator. From scientific Latin Sipunculida from Sipunculus + -ida.
Definition of Sipunculida in US English:
Sipunculida
nounˌsʌɪpəŋˈkjuːlɪdə
Zoology
Sipuncula.
Origin
Mid 19th century; earliest use found in William Carpenter (1813–1885), biologist and university administrator. From scientific Latin Sipunculida from Sipunculus + -ida.