A review of the genus Chrastoblatta Saussure et Zehntner, 1895 (Dictyoptera: Ectobiidae: Blattellinae)Proceedings of the Zoological Institute RAS, 2020, 324(3): 298–305 · https://doi.org/10.31610/trudyzin/2020.324.3.298 Abstract This paper gives a review of the insufficiently studied genus Chrastoblatta Saussure et Zehntner, 1895. The genus Chrastoblatta was described from Madagascar (environs of Antananarivo) and includes two species: Ch. tricolor Saussure et Zehntner, 1895 and Ch. dimidiata (Saussure, 1863). This contribution is based on the study of a series of paralectotypes of Ch. tricolor and syntypes of Ch. dimidiata from The Muséum d’histoire naturelle in Geneva. Additional specimens of Ch. tricolor were found in the collection of the Zoological Institute of the Russian Academy of Sciences in Saint Petersburg. Detailed morphological description of the type species, Ch. tricolor, is given. Particular attention is paid to the structure of the male and female genitalia, which are described for the first time. Chrastoblatta dimidiata is briefly described due to insufficient and damaged material, but it is probably closely related to the type species. The genus Chrastoblatta is characterized by a peculiar structure of the wide and flat head, hind tibiae with concavity at the apex, a distinctly reduced 4th segment of the tarsi, an asymmetrical hypandrium, and robust, curved styli. The presence of not inverted genitalia suggests the placement of Chrastoblatta in the subfamily Blattellinae. At the present time, the differential diagnosis of the genus Chrastoblatta based on characters of the male and female genitalia cannot be compiled due to insufficient knowledge of other Madagascan ectobiid. Key words Chrastoblatta, cockroaches, Madagascar, morphology, taxonomy Submitted May 26, 2020 · Accepted July 13, 2020 · Published September 25, 2020 References Anisyutkin L . N . 2012. A description of a new species of the cockroach genus Prosoplecta Saussure, 1864 (Dictyoptera, Ectobiidae) from South Vietnam. Entomologicheskoe Obozrenie, 91(4): 742–756. (English translation published in Entomological Review, 2013, 93(2): 182–193). https://doi.org/10.1134/S0013873813020061 Bey-Bienko G.Ya. 1950. Cockroach insects. Fauna USSR, New Ser., 40. Moscow–Leningrad, 343 p. [in Russian]. Brunner von Wattenwyl C. 1865. Nouveau système des Blattaires. Carl Ueberreuter, Wien, 426 p. https://doi.org/10.5962/bhl.title.5652 Grandcolas P. 1996. The phylogeny of cockroach families: a cladistic appraisal of morpho-anatomical data. Canadian Journal of Zoology, 74(3): 508–527. https://doi.org/10.1139/z96-059 Klass K.-D. 1997. The external male genitalia and the phylogeny of Blattaria and Mantodea. Bonner Zoologische Monographien, 42: 1–341. Klass K.-D. 1998. The ovipositor of Dictyoptera (Insecta): homology and ground-plan of the main elements. Zoologischer Anzeiger, 236: 69–101. McKittrick F.A. 1964. Evolutionary studies of cockroaches. Cornell University Agricultural Experiments Station Memoir, 389: 1–197. Princis K. 1951. Kleine Beiträge zur Kenntnis der Blattarien und ihrer Verbreitung. IV. Opuscula entomologica, 16: 89–93. Rehn J. W. H. 1951. Classification of the Blattaria as indicated by their wings (Orthoptera). Memoirs of the American Entomological Society, 14: 1–134. Roth L.M. 1985. A taxonomic revision of the genus Blattella Caudell (Dictyoptera, Blattaria: Blattellidae). Entomologica scandinavica, Supplement, 22: 1–221. Roth L.M. 2003. Systematics and Phylogeny of Cockroaches (Dictyoptera: Blattaria). Oriental Insects, 37: 1–186. https://doi.org/10.1080/00305316.2003.10417344 Saussure H. de. 1863. Mélanges Orthoptérologiques. Blattides. Mémoires de la Société de Physique et d’Histoire Naturelle de Geneve, 17: 129–171. Saussure H. de and Zehnther L. 1895. Histoire naturelle des Blattides et Mantides. In: A. Grandidier (Ed.). Histoire physique, naturelle et politique de Madagascar. V. 23. Histoire naturelle des Orthoptères. L’imprimerie nationale, Paris: 2–244. Walker F. 1869. Catalogue of the specimens of Dermaptera Saltatoria and supplement to the Blattariae in the collection of the British Museum. British Museum, London, 224 p. https://doi.org/10.5962/bhl.title.28190
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