• The concept of ancillary federal jurisdiction is now contained in the supplemental-jurisdiction statute, 28 USCA § 1367. See ancillary jurisdiction and supplemental jurisdiction under JURISDICTION. [Cases: Federal Courts 14, 20.]
ancillary claim
A claim that is collateral to, dependent on, or auxiliary to another claim, such as a state-law claim that is sufficiently related to a federal claim to permit federal jurisdiction over it.