The family Lycoteuthidae is revised on a world wide basis. An historical account is followed by a discussion of the anatomy, food, depth range and geographical distribution. The taxonomic status with full synonymy is given for each species including keys for differentiation. The family
and subfamilies are redefined and new generic diagnoses are given along with type citations. Oregoniateuthis lorigera (Steenstrup, 1857) is described in full for the first time and Lycoteuthis diadema, Oregoniateuthis springeri, Selenoteuthis scintillans, Nematolampas regalis,
and Lampadioteuthis megaleia are described and illustrated. Leptodontoteuthis inermis Robson, 1926 is placed in the synonymy of Lycoteuthis diadema (Chun, 1900). The phylogenetic relationships of the Lycoteuthidae are discussed as well as the relationship of the genera
within the family. The possibility is considered, on the basis of their occurrence within two different genera, that the males of the lycoteuthids possess paired, functional genitalia.
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