Abstract
Orthobula Simon, 1897 is a group of very small litter-dwelling spiders with a tropical and subtropical distribution. The genus comprises 18 species, without any records in the Neotropical realm yet. Here we describe O. sudamericana sp. nov., distributed in Argentina and Paraguay. The new species appears to be most closely related to O. chayuensis Yang, Song and Zhu, 2003. The male also resembles O. charitonovi (Mikhailov, 1986). Orthobula sudamericana sp. nov. females differ from these species by the straight and parallel insemination ducts, and males by the centrally located, U-shaped sperm duct. Further, we summarize details on its natural history and habitat characteristics.
References
Brignoli, P.M. (1983) A catalogue of the Araneae described between 1940 and 1981. Manchester University Press, Manchester, 755 pp.
Bosselaers, J. & Jocqué, R. (2002) Studies in Corinnidae: Cladistic analysis of 38 corinnid and liocranid genera, and transfer of Phrurolithinae. Zoologica Scripta, 31 (3), 241–270. https://doi.org/10.1046/j.1463-6409.2002.00080.x
Cardoso, P., Pekár, S., Jocqué, R. & Coddington, J.A. (2011) Global patterns of guild composition and functional diversity of spiders. PLoS One, 6 (6), e21710. https://doi.org/10.1371/journal.pone.0021710
Danýþman, T., Erdek, M., Sancak, Z. & Coþar, Ý. (2012) A new genus record for the corinnid sac spider fauna of Turkey (Araneae: Corinnidae). Munis Entomology & Zoology, 7 (2), 1097–1100.
Deeleman-Reinhold, C.L. (2001) Forest Spiders of South East Asia: With a revision of the sac and ground spiders (Araneae: Clubionidae, Corinnidae, Liocranidae, Gnaphosidae, Prodidomidae and Trochanteriidae). Brill, Leiden. https://doi.org/10.1163/9789004475588
Dias, S.C., Carvalho, L.S., Bonaldo, A.B. & Brescovit, A.D. (2009) Refining the establishment of guilds in Neotropical spiders (Arachnida: Araneae). Journal of Natural History, 44 (3–4), 219–239. https://doi.org/10.1080/00222930903383503
Dippenaar-Schoeman, A.S. & Jocqué, R. (1997) African spiders: an identification manual. Plant Protection Research Institute Handbook No. 9. ARC – Plant Protection Research Institute, Pretoria, 392 pp.
Ferreira, T. & Rasband, W. (2012) ImageJ user guide. ImageJ, Fiji.
Global Biodiversity Information Facility (2021) GBIF Occurrence Download https://doi.org/10.15468/dl.6azb9t (accessed 6 May 2021)
Haddad, C.R., Jin, C., Platnick, N.I. & Booysen, R. (2021) Capobula gen. nov., a new Afrotropical dark sac spider genus related to Orthobula Simon, 1897 (Araneae: Trachelidae). Zootaxa, 4942 (1), 41–71. https://doi.org/10.11646/zootaxa.4942.1.2
Levi, H.W. (1965) Techniques for the study of spider genitalia. Psyche, 72 (2), 152–158. https://doi.org/10.1155/1965/94978
Lehtinen, P.T. (1967) Classification of the cribellate spiders and some allied families, with notes on the evolution of the suborder Araneomorpha. Annales Zoologici Fennici, 4, 199–468.
Marusik, Y.M., Özkütük, R.S. & Kunt, K.B. (2013) On the identity and distribution of the poorly known spider Orthobula charitonovi (Mikhailov, 1986) (Aranei: Corinnidae). Arthropoda Selecta, 22 (2), 157–162. https://doi.org/10.15298/arthsel.22.2.05
Morellato, L.P.C. & Haddad, C.F.B. (2000) Introduction: The Brazilian Atlantic Forest 1. Biotropica, 32 (4b), 786–792. https://doi.org/10.1111/j.1744-7429.2000.tb00618.x
Morrone, J.J. (2014) Biogeographical regionalisation of the Neotropical region. Zootaxa, 3782 (1), 1–110. https://doi.org/10.11646/zootaxa.3782.1.1
Ramírez, M.J. (2014) The morphology and phylogeny of dionychan spiders (Araneae, Araneomorphae). Bulletin of the American Museum of Natural History, 390, 1–374. https://doi.org/10.1206/821.1
Roewer, C.F. (1955) Katalog der Araneae von 1758 bis 1940, bzw. 1954. 2. Band, Abt. a (Lycosaeformia, Dionycha [excl. Salticiformia]). 2. Band, Abt. b (Salticiformia, Cribellata) (Synonyma-Verzeichnis, Gesamtindex). Institut royal des Sciences naturelles de Belgique, Bruxelles, 1751 pp.
Saaristo, M.I. (2010) Araneae. In: Gerlach, J. & Marusik, Y.M. (eds.) Arachnida and Myriapoda of the Seychelles islands. Siri Scientific Press, Manchester, pp. 8–306.
Simon, E. (1897a) Histoire naturelle des araignées. Tome second, Premier fascicule. Librairie Encyclopédique de Roret, Paris, 1–192. https://doi.org/doi:10.5962/bhl.title.51973
Ubick, D. & Platnick, N.I. (1991) On Hesperocranum, a new spider genus from western North America (Araneae, Liocranidae). American Museum Novitates, 3019, 1–12.
Wheeler, W.C., Coddington, J.A., Crowley, L.M., Dimitrov, D., Goloboff, P.A., Griswold, C.E., Hormiga, G., Prendini, L., Ramírez, M.J., Sierwald, P., Almeida-Silva, L., Alvarez-Padilla, F., Arnedo, M.A., Silva, L.R.B., Benjamin, S.P., Bond, J.E., Grismado, C.J., Hasan, E., Hedin, M. & Zhang, J. (2017) The spider tree of life: Phylogeny of Araneae based on target-gene analyses from an extensive taxon sampling. Cladistics, 33 (6), 574–616. https://doi.org/10.1111/cla.12182
World Spider Catalog (2021) World Spider Catalog. Version 22.0. Natural History Museum Bern. Available from: http://wsc.nmbe.ch (accessed 20 July 2021)