Abstract
Anthobothrium galeorhini n. sp. (Eucestoda: Phyllobothriidae) collected from the spiral intestine of Galeorhinus galeus (Linnaeus, 1758) at the Puerto Madryn (Atlantic coastal region) is described. The new species differs from A. cornucopia as described by Euzet (1959) by the size of body, bothridia, gravid proglottids and eggs; by the neck length and by the different number of testes and proglottids. The size of bothridia and the gravid proglottids, the cirrus length and the number of testes allow differentiating the species here proposed from A. laciniatum Linton, 1890 as described by Euzel (1959). The body and cirrus sac size, the bothridia shape and the number of testes separate the species here described from A. parvum Stossich, 1895 as described by Yamaguti (1952). The anatomic differences between the cestode described by Arandas Rego (1977) and located laxonomycally under the name Anthobothrium laciniatum are listed and the systematic position of the cestode is discussed. Species parasitic of skates listed in scientific literature must be taxonomically reaccommodated, since their characteristics are not consistent with the diagnosis of Anthobothrium.
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