Further dismemberment of Discocyrtus with description of a new Amazonian genus and a new subfamily of Gonyleptidae (Opiliones, Laniatores)

  • Rafael Carvalho Departamento de Invertebrados, Museu Nacional/UFRJ, Quinta da Boa Vista, São Cristóvão, 20.940-040, Rio de Janeiro.
  • Adriano Kury Departamento de Invertebrados, Museu Nacional/UFRJ, Quinta da Boa Vista, São Cristóvão, 20.940-040, Rio de Janeiro.
DOI: https://doi.org/10.5852/ejt.2018.393
Keywords: arachnida, grassatores, neotropics, amazonia, mitobatinae, pachylinae

Abstract

A group of Amazonian harvestmen is recognized and described as Amazochroma gen. nov. This taxon includes Discocyrtus carvalhoi Mello-Leitão, 1941 (type species), the only species of Discocyrtus previously thought to occur in Amazonia, and Amazochroma pedroi gen. et sp. nov., described here from the Brazilian states of Acre and Rondônia. New records are added for Amazochroma carvalhoi gen. et comb. nov, expanding its distribution from the Brazilian state of Mato Grosso northwards also to Pará and Amazonas in Brazil and additionally French Guiana and Suriname. Diagnostic features of Amazochroma gen. nov. include: trichromatic pattern of legs, dry marks on the dorsal scutum and base of legs and diastema in the row of macrosetae C of the penis ventral plate. A morphological maximum parsimony analysis (1022 scorings; 16 taxa; 64 characters) is performed to test whether Amazochroma gen. nov. is a member of Discocyrtus and if the traditional allocation of Discocyrtus in Pachylinae is defendable. A clade is retrieved containing three groups: (1) Mitobatinae, (2) Discocyrtus and (3) a clade containing Amazochroma gen. nov., Discocyrtanus and Roeweria, here described as a new subfamily of Gonyleptidae – Roeweriinae subfam. nov. Discocyrtanus Roewer, 1929 and Roeweria Mello-Leitão, 1923 are accordingly here transferred from Pachylinae to Roeweriinae subfam. nov.

References

Avram Ş. 1968. Laniatores cavernicoles de Roumanie. Révision des genres Scotolemops Rwr., Brigestus Rwr. et Bukowina Rwr. (Opiliones, Phalangodidae). Annales de Spéléologie, 23 (3): 641–665.

Bragagnolo C. & Pinto-da-Rocha R. 2012. Systematic review of Promitobates Roewer, 1913 and cladistic analysis of Mitobatinae Simon, 1879 (Arachnida: Opiliones: Gonyleptidae). Zootaxa 3308: 1–48.

Bremer K. 1994. Branch support and tree stability. Cladistics, 10: 295–304. https://doi.org/10.1111/j.1096-0031.1994.tb00179.x

DaSilva M.B. & Gnaspini P. 2010. A systematic revision of Goniosomatinae (Arachnida: Opiliones: Gonyleptidae), with a cladistic analysis and biogeographical notes. Invertebrate Systematics, 23 (6): 530–624. https://doi.org/10.1071/IS09022

Goloboff P.A. 1993. Estimating character weights during tree search. Cladistics, 9: 83–91. https://doi.org/10.1111/j.1096-0031.1993.tb00209.x

Goloboff P., Farris J., Källersjö M., Oxelmann B., Ramírez M. & Szumik C., 2003. Improvements to resampling measures of group support. Cladistics, 19: 324–332.

Goloboff P.A., Carpenter J.M., Arias J.S. & Esquivel D.R.M. 2008a. Weighting against homoplasy improves phylogenetic analysis of morphological data sets. Cladistics, 24 (5): 758–773. https://doi.org/10.1111/j.1096-0031.2008.00209.x

Goloboff P.A, Farris J.S. & Nixon K.C. 2008b. TNT, a free program for phylogenetic analysis. Cladistics, 24: 774–786. https://doi.org/10.1111/j.1096-0031.2008.00217.x

Henriksen K.L. 1932. Descriptiones Laniatorum (Arachnidorum Opilionum Subordinis) fecit William Sørensen. Opus posthumum recognovit et edidit Kai L. Henriksen. Det Kongelige Danske Videnskabernes Selskabs Skrifter Naturvidenskabelig og Mathematisk Afdeling series 9, 3 (4): 197–422.

Jaffer A. 2001+. NBS/ISCC Centroids. In: Color-Name Dictionaries [online]. Available from http://people.csail.mit.edu/jaffer/Color/Dictionaries#nbs-iscc [accessed 12 Jan. 2017].

Kury A.B. 1989. Notes on Mitobatinae III: A remarkable new Brazilian species of Mitobates Sundevall, 1833 (Opiliones, Laniatores, Gonyleptidae). Boletim do Museu Nacional, (N.S. Zoologia) 328: 1–12.

Kury A.B. 1991. Análise filogenética de Mitobatinae (Opiliones, Laniatores, Gonyleptidae). MSc dissertation, UFRJ/Museu Nacional – Programa de Pós-graduação em Ciências Biológicas (Zoologia). Rio de Janeiro.

Kury A.B. 2003. Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones). Revista Ibérica de Aracnología volumen. Especial Monográfico 1: 1–337.

Kury A.B. 2008. Two new troglomorph Pachylinae (Opiliones, Laniatores, Gonyleptidae) from caves in Bahia, Brazil. Studies on Neotropical Fauna and Environment 43 (3): 247–253. https://doi.org/10.1080/01650520701731794

Kury A.B. 2016. A classification of the penial microsetae of Gonyleptoidea (Opiliones: Laniatores). Zootaxa 4179 (1): 144–150. https://doi.org/10.11646/zootaxa.4179.1.13

Kury A.B. & Carvalho R.N. 2016. Revalidation of the Brazilian genus Discocyrtanus, with description of two new species (Opiliones: Gonyleptidae: Pachylinae). Zootaxa 4111 (2): 126–144. https://doi.org/10.11646/zootaxa.4111.2.2

Kury A. & Medrano M. 2016. Review of terminology for the outline of dorsal scutum in Laniatores (Arachnida, Opiliones). Zootaxa 4097 (1): 130–134. https://doi.org/10.11646/zootaxa.4097.1.9

Kury A.B. & Orrico V.G.D. 2006. A new species of Lacronia Strand, 1942 from the highlands of Rio de Janeiro (Opiliones, Gonyleptidae, Pachylinae). Revista Ibérica de Aracnologia 13: 147–153.

Kury A.B. & Villarreal M.O. 2015. The prickly blade mapped: establishing homologies and a chaetotaxy for macrosetae of penis ventral plate in Gonyleptoidea (Arachnida, Opiliones, Laniatores). Zoological Journal of the Linnean Society 174 (1): 1–46. https://doi.org/10.1111/zoj.12225

Löwenberg-Neto P. 2014. Neotropical region: a shapefile of Morrone’s (2014) biogeographical regionalisation. Zootaxa, 3802: 300. https://doi.org/10.11646/zootaxa.3802.2.12

Mello-Leitão C.F. de 1923. Opiliones Laniatores do Brasil. Archivos do Museu Nacional 24: 107–197.

Mello-Leitão C.F. de 1930. Nota sobre arachnideos argentinos. I. Ainda o genero Apembolephaenus. II. Um genero e tres especies novas de Gonyleptidas. Annais da Academia Brasileira de Sciencias 2 (4): 211–214.

Mello-Leitão C.F. de 1939. Dois gêneros e sete espécies de Goniléptidas sulamericanos. Boletim Biológico, (N. Série) 4 (3): 345–351.

Mello-Leitão C.F. de 1941. Opiliões coligidos por Antenor Leitão de Carvalho no Tapirapés. Revista Brasileira de Biologia 1 (4): 435–442.

Morrone J.J. 2014. Biogeographical regionalisation of the Neotropical region. Zootaxa 3782 (1): 1–110. https://doi.org/10.11646/zootaxa.3782.1.1

O’Leary M.A. & Kaufman, S.G. 2012. MorphoBank 3.0: Web application for morphological phylogenetics and taxonomy. Available from http://www.morphobank.org [accessed 05 Mar. 2017].

Olson D.M., Dinerstein E., Wikramanayake E.D., Burgess N.D., Powell G.V.N., Underwood E.C., D’Amico J.A., Itoua I., Strand H.E., Morrison J.C., Loucks C.J., Allnutt T.F., Ricketts T.H., Kura Y., Lamoreux J.F., Wettengel W.W., Hedao P. & Kassem K.R. 2001. Terrestrial ecoregions of the World: A new map of life on Earth. BioScience 51: 933–938.

Pinto-da-Rocha R. 2002. Systematic review and cladistic analysis of the Caelopyginae (Opiliones, Gonyleptidae). Arquivos de Zoologia 36 (4): 357–464.

Pinto-da-Rocha R., Bragagnolo C., Marques F.P.L. & Antunes Jr M. 2014. Phylogeny of harvestmen family Gonyleptidae inferred from a multilocus approach (Arachnida: Opiliones). Cladistics 30 (5): 519–539. https://doi.org/10.1111/cla.12065

Roewer C.F. 1913. Die Familie der Gonyleptiden der Opiliones-Laniatores. Archiv für Naturgeschichte 79 (4): 1–256.

Roewer C.F. 1923. Die Weberknechte der Erde. Systematische Bearbeitung der bisher bekannten Opiliones. Gustav Fischer, Jena.

Soares B.A.M. & Soares H.E.M. 1954. Monografia dos gêneros de opiliões neotrópicos III. Arquivos de Zoologia do Estado de São Paulo 8 (9): 225–302.

Soares B.A.M. & Soares H.E.M. 1970. Opiliões de Itatiaia. Revista Brasileira de Biologia 30 (3): 339–350.

Tavares M.L.R. 1981. Descrição de uma nova espécie de Discocyrtus Holmberg, 1878 do estado do Rio Grande do Sul (Opiliones: Gonyleptidae: Pachylinae). Iheringia (Zool.) 60: 55–61.

Published
2018-01-09
How to Cite
Carvalho, R., & Kury, A. (2018). Further dismemberment of Discocyrtus with description of a new Amazonian genus and a new subfamily of Gonyleptidae (Opiliones, Laniatores). European Journal of Taxonomy, (393). https://doi.org/10.5852/ejt.2018.393
Issue
No. 393 (2018): Further dismemberment of Discocyrtus with description of a new Amazonian genus and a new subfamily of Gonyleptidae (Opiliones, Laniatores)
Section
Zoology
Copyright (c) 2018 Rafael Carvalho, Adriano Kury

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