• Illaenus Dalman, 1827 †
• Illaenus americanus (Billings) †
• Illaenus armatus Hall †
• Illaenus barriensis †
• Illaenus chicagoensis Weller, 1907 †
• Illaenus crassicauda Wahlenberg †
• Illaenus cuniculus Weller, 1907 †
• Illaenus danielsi Gurley & Miller, 1893 †
• Illaenus davisi (Salter, 1849) †
• Illaenus graftonensis Meek & Worthen, 1870 †
• Illaenus harrisi Weller, 1907 †
• Illaenus insignis Hall †
• Illaenus ioxus Hall †
• Illaenus limbatus Corda & Hawle, 1847 †
• Illaenus salteri (Barrande) †
• Illaenus transversalis Weller, 1907 †