| dbp:subdivision
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- * I. antiquus
* I. avonicola (Estes, 1964)
* I. marrocanus
* I. mira (Leidy, 1856)
* I. stromeri
* I. texana (Cappetta & Case 1975)
* I. serra (Nessov, 1997)
* I. nigeriensis (Tabaste, 1963)
* I. hartenbergeri (Cappetta, 1975)
* I. germaniae (Weiler & Albers, 1964)
* I. viaudi (Cappetta, 1981)
* I. antiqua
* I. radiata (en)
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