New species and new records of Dicranocentrus Schött, 1893 (Collembola: Entomobryidae) from Southeastern Brazil

in Insect Systematics & Evolution
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Aimed at extending the incipient knowledge of Dicranocentrus in Brazil, in this study we describe and illustrate the morphology and chaetotaxy of four new species from Espírito Santo, Minas Gerais and São Paulo States and also two new records of D. heloisae for Minas Gerais and São Paulo States. The new species D. magnus sp.n., D. albicephalus sp.n. and D. marimutti sp.n. belong to the gracilis-group and D. pikachu sp.n. to the marias-group. A map with their distribution in Brazil and a table with Neotropical species’ main characteristics are also provided. The species herein reported represent the first record of Dicranocentrus for São Paulo State.

Insect Systematics & Evolution

An International Journal of Systematic Entomology

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References

Arlé R. & Mendonça M.C. (1982) Estudo preliminar das espécies de Dicranocentrus Schött, 1893, ocorrentes no Parque Nacional da Tijuca, Rio de Janeiro (Collembola). Revista Brasileira de Biologia 42: 4149.

Bellinger P. ; Christiansen K. & Janssens F. (2016 ) Checklist of the Collembola of the World. 1996–2016, available online at http://www.collembola.org (accessed 13 Jun 2016).

CDC–Centers for Disease Control and Prevention (2016) Early Hearing Detection and Intervention in Latin America, available online at http://www.cdc.gov/ncbddd/hearingloss/ehdi-latin.html (accessed 25 Oct 2016).

Fjellberg A. (1984) The maxillary outer lobe, an important systematic tool in Isotomidae (Collembola). Annates de la Societe Royale Zoologique de Belgique 114: 8388.

Fjellberg A. (1999) The labial palp in Collembola. Zoologischer Anzeiger 237: 309330.

ICZN–International Commission on Zoological Nomenclature (2000) International Code of Zoological Nomenclature, Fourth Edition, available online at http://www.nhm.ac.uk/hosted-sites/iczn/code (accessed 21 Nov 2016).

Mari-Mutt J.A. (1979) A revision of the genus Dicranocentrus Schött (Insecta: Collembola: Entomobryidae). University of Puerto Rico, Mayagüez Campus, College of Agricultural Sciences, Agricultural Experiment Station 259: 179.

Mari-Mutt J.A. (1981) New genus, a new species, and complements to the descriptions of seven Neotropical Dicranocentrus (Collembola: Entomobryidae: Orchesellinae). The Journal of Agriculture of the University of Puerto Rico 65: 90107.

Mari-Mutt J.A. (1985) Two new species of Dicranocentrus from Puerto Rico and the Dominican Republic (Collembola: Entomobryidae). Caribbean Journal of Science 21: 105110.

Xisto T. & Mendonça M.C. (2014) Redescription of Dicranocentrus heloisae Arlé & Mendonça, 1982 (Collembola: Entomobryidae). Journal of Insect Biodiversity 2: 110.

Xisto T. & Mendonça M.C. (2016a) Contribuição ao conhecimento da morfologia e taxonomia de Dicranocentrus Schött, 1893 com histórico comentado para a Região Neotropical (Collembola: Entomobryidae). In Da-Silva E.R. ; Passos M.I.S. ; Aguiar V.M. ; Lessa C.S.S. & Coelho L.B.N. (Eds) Anais do III Simpósio de Entomologia do Rio de Janeiro. Universidade Federal do Estado do Rio de Janeiro (UNIRIO) Perse, Rio de Janeiro, pp. 151165.

Xisto T. & Mendonça M.C. (2016b) Two new species of Dicranocentrus Schött, 1893 (Collembola: Entomobryidae) from Serra do Gandarela, Minas Gerais State, Brazil. Zootaxa 4079: 217228.

Xisto T. ; Mendonça M.C. & Abrantes E.A. (2015) Dicranocentrus heloisae Arlé & Mendonça, 1982 (Collembola: Entomobryidae): first record of the genus in Espírito Santo state, Brasil. Check List 11: 13.

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Figures

  • Map of occurrence of Dicranocentrus species in Brazilian states, highlighting Southeast Region of Brazil. Modified from Xisto et al. (2015) and CDC (2016).

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  • Dicranocentrus magnus sp.n.: Habitus in ethanol.

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  • Dicranocentrus magnus sp.n.: a, antenna (all chaetae omitted); b, ventral view of Ant VI apex; c, sensory organ on Ant V; d, eyepatch; e, labrum; f, maxillary palp and sublobal plate; g, outer labial papilla with ventral guard chaetae; h, outer labial papilla with dorsal guard chaetae; i, labial triangle.

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  • Dicranocentrus magnus sp.n.: a, trochanter; b, distal part of metathoracic tibiotarsus and foot complex; c, anterior side of ventral tube; d, posterior side of ventral tube; e, tenaculum.

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  • Dicranocentrus magnus sp.n.: a, arrangement of spines on basal region of dens; b, distal region of dens and mucro (basal spine hidden); c, dorsal cephalic macrochaetotaxy; d, half dorsal macrochaetotaxy on Th. II to Abd IV.

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  • Dicranocentrus pikachu sp.n.: Habitus in ethanol (specimen without complete antennae).

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  • Dicranocentrus pikachu sp.n.: a, antenna (all chaetae omitted); b, ventral view of Ant VI apex; c, sensory organ on Ant V; d, eyepatch; e, labrum; f, maxillary palp and sublobal plate; g, outer labial papilla with ventral guard chaetae; h, outer labial papilla with dorsal guard chaetae; i, labial triangle.

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  • Dicranocentrus pikachu sp.n.: a, trochanteral organ; b, dorsal view of trocanter; c, metathoracic tibiotarsus; d, distal part of metathoracic tibiotarsus and foot complex; e, anterior side of ventral tube; f, posterior side of ventral tube; g, tenaculum.

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  • Dicranocentrus pikachu sp.n.: a, arrangement of spines on basal region of dens; b, distal region of dens and mucro; c, dorsal cephalic macrochaetotaxy (eyes omitted); d, half dorsal macrochaetotaxy on Th. II to Abd IV (arrow indicates variation observed on Th. II).

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  • Dicranocentrus albicephalus sp.n.: Habitus in ethanol.

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  • Dicranocentrus albicephalus sp.n.: a, antenna (all chaetae omitted); b, ventral view of Ant VI apex; c, sensory organ on Ant V; d, eyepatch; e, labrum; f, maxillary palp and sublobal plate; g, outer labial papilla with guard chaetae (LP, lateral process); h, labial triangle.

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  • Dicranocentrus albicephalus sp.n.: a, trochanteral organ; b, distal part of metathoracic tibiotarsus and foot complex; c, anterior side of ventral tube; d, posterior side of ventral tube; e, tenaculum; f, spines on basal region of dens.

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  • Dicranocentrus albicephalus sp.n.: a, distal region of dens and mucro; b, dorsal cephalic macrochaetotaxy (eyes omitted); c, half dorsal macrochaetotaxy, bothriotricha and pseudopores on Th. II to Abd IV. (null sign represents a pseudopore).

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  • Dicranocentrus marimutti sp.n.: Habitus in ethanol. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/journals/1876312X.

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  • Dicranocentrus marimutti sp.n.: a, antenna; b, ventral view of Ant VI apex; c, sensory organ on Ant V; d, eyepatch; e, labrum; f, maxillary palp and sublobal plate; g, outer labial papilla with ventral guard chaetae; h, outer labial papilla with dorsal guard chaetae; i, labial triangle.

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  • Dicranocentrus marimutti sp.n.: a, trochanteral organ; b, distal part of metathoracic tibiotarsus and foot complex; c, anterior side of ventral tube; d, tenaculum.

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  • Dicranocentrus marimutti sp.n.: a, spines on basal region of dens; b, distal region of dens and mucro; c, dorsal cephalic macrochaetotaxy (eyes omitted); d, half dorsal macrochaetotaxy, bothriotricha and pseudopores on Th. II to Abd IV. (null sign represents a pseudopore).

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  • Dicranocentrus heloisae Arlé & Mendonça, 1982: a, specimen from Minas Gerais State (right antenna incomplete); b, specimen from São Paulo State. Habitus in ethanol.

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