In search of the trueTydeus(Acari, Tydeidae)

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Abstract
The early history of the genus Tydeus, the type genus of the family Tydeidae, is complex and convoluted and, subsequently, even the identity of the type species of the family remains unclear. First, the literature is thoroughly analysed and morphological characters of some species are reappraised. After studying Oudemans' types, two species inquirendae, Tydeus croceus and T. cruciatus, are redescribed and a third, T. spathulatus, removed from synonymy and reinstated as a valid species. A fourth species, confused with T. spathulatus, is described. A lectotype is designated for T. spathulatus and a neotype for T. croceus. After discussion, the genus Lorryia Oudemans, 1925 Oudemans AC Acarologische aanteekeningen LXXIX. 1925 Entomologische Berichten 7 26 34 [481] is re‐established in its pristine state. As the redescribed species were designated as type species by Oudemans, the following new generic synonymies are proposed: Raphitydeus Thor, 1933 Thor, S . 1933. Tydeidae, Ereynetidae.. Das Tierreich, 60: 1–84. and Lorryia Oudemans, 1925 Oudemans AC Acarologische aanteekeningen LXXIX. 1925 Entomologische Berichten 7 26 34 [481] sensu Kaźmierski ( 1989 Kaźmierski, A . 1989. Revision of the genus Tydeus Koch sensu André, Homeotydeus André and Orthotydeus André with description of a new genus and our new species of Tydeinae (Acari: Actinedida: Tydeidae).. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 86: 289–314. , 1998 Kaźmierski, A . 1998. Tydeinae of the world: generic relationships, new and redescribed taxa and keys to all species. A revision of the subfamilies Pretydeinae and Tydeinae (Acari: Actinedida: Tydeidae)—Part IV.. Acta Zoologica Cracoviensia, 41: 283–455. ) are junior synonyms of Brachytydeus Thor, 1931 Thor, S . 1931. Norwegische Tydeidae. I–VII. Mit Kennzeichnung vier neuer Gattungen.. Zoologischer Anzeiger, 94: 89–104. ; Homeotydeus André, 1980 André, HM . 1980. A generic revision of the family Tydeidae (Acari: Actinedida). IV. Generic descriptions, keys and conclusions.. Bulletin et Annales de la Société royale belge d'Entomologie, 116: 103–130, 139–168 (partim) and Pseudolorryia Kaźmierski, 1989 Kaźmierski, A . 1989. Revision of the genus Tydeus Koch sensu André, Homeotydeus André and Orthotydeus André with description of a new genus and our new species of Tydeinae (Acari: Actinedida: Tydeidae).. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 86: 289–314. are junior synonyms of Calotydeus Oudemans, 1937 Oudemans AC Kritisch historisch Overzicht der Acarologie. 1937 Derde Gedeelde, Band C Leiden E. J. Brill p I–XXIII, 799–1348 [566] ; Brachytydeus Thor, 1933 Thor, S . 1933. Tydeidae, Ereynetidae.. Das Tierreich, 60: 1–84. (partim), Calotydeus Oudemans, 1937 Oudemans AC Kritisch historisch Overzicht der Acarologie. 1937 Derde Gedeelde, Band C Leiden E. J. Brill p I–XXIII, 799–1348 [566] (partim), Tydeus Koch, 1836 Koch CL 1836 Deutschlands Crustaceen, Myriapoden und Arachniden. Ein Beitrag zur deutschen Fauna, Heft 137 Regensburg Herrich‐Schäffer sensu Oudemans, 1937 Oudemans AC Kritisch historisch Overzicht der Acarologie. 1937 Derde Gedeelde, Band C Leiden E. J. Brill p I–XXIII, 799–1348 [566] (partim), Orthotydeus André, 1980 André, HM . 1980. A generic revision of the family Tydeidae (Acari: Actinedida). IV. Generic descriptions, keys and conclusions.. Bulletin et Annales de la Société royale belge d'Entomologie, 116: 103–130, 139–168 , and Tydeus Koch, 1836 Koch CL 1836 Deutschlands Crustaceen, Myriapoden und Arachniden. Ein Beitrag zur deutschen Fauna, Heft 137 Regensburg Herrich‐Schäffer sensu Kaźmierski, 1989 Kaźmierski, A . 1989. Revision of the genus Tydeus Koch sensu André, Homeotydeus André and Orthotydeus André with description of a new genus and our new species of Tydeinae (Acari: Actinedida: Tydeidae).. Mitteilungen aus dem Hamburgischen Zoologischen Museum und Institut, 86: 289–314. are junior synonyms of Tydeus Koch, 1836 Koch CL 1836 Deutschlands Crustaceen, Myriapoden und Arachniden. Ein Beitrag zur deutschen Fauna, Heft 137 Regensburg Herrich‐Schäffer . To stabilize the usage of the names, especially that of the genus type of the family Tydeidae, the International Commission of Zoological Nomenclature will be asked to set aside all previous type species designations for Tydeus and to designate Tydeus spathulatus as the type species, with Oudemans' specimens from Italy as primary type material.

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