Abstract
The new genus Yanomamius n. gen. from Brazilian and Venezuelan Amazon is described, with three new species from Brazil: Y. franciscoi n. sp. (type species), Y. raonii n. sp., and Y. neblina n. sp. The enigmatic Venezuelan species described as Holothele waikoshiemi Bertani & Araújo, 2006 and presently included in Guyruita Guadanucci et al. (2007) is transferred to the new genus, making the new combination Y. waikoshiemi (Bertani & Araújo, 2006) n. comb. Yanomamius n. gen. is closely related with the schismatotheline genera Schismatothele Karsch, 1879 and Euthycaelus Simon, 1889 sharing as probable synapomorphies a group of short spines on the retrolateral distal tibia of male palp and the shape of bulb. They differ by the position of the spines in a compact group instead of in rows and by a tapering embolus. Females differ from Schismatothele and Euthycaelus by the spermathecae weakly sclerotized. A series of recent phylogenies based on molecular data suggested a close relationship between schimatothelines and psalmopoeines. The male tibia I of Yanomamius n. gen. species have a series of ridges or a single protuberance behind the tibial apophyses that resemble those of psalmopoeines and strengthen the idea of close relationship of the two subfamilies.
References
Bertani, R. & Araújo, Y. (2006) A new species of Holothele Karsch, 1879 (Theraphosidae, Ischnocolinae) from Venezuela. Revista Ibérica de Aracnologia, 12, 13–16.
Carvalho, L.S., Martins, P.H., Schneider, M.C. & Cabra-García, J. (2017) New records of spiders (Arachnida, Araneae) from the state of Roraima, northern Brazil. Check List, 13 (1), 2040, 1–23.
https://doi.org/10.15560/13.1.2040
Foley, S., Lüddecke, T., Chen, D.Q., Krehenwinkel, H., Künzel, S., Longhorn, S., Wendt, I., Wirth, V. von, Tänzler, R., Vences, M. & Piel, W.H. (2019) Tarantula phylogenomics: A robust phylogeny of deep theraphosid clades inferred from transcriptome data sheds light on the prickly issue of urticating setae evolution. Molecular Phylogenetics and Evolution, 140 (106573), 1–12.
https://doi.org/10.1016/j.ympev.2019.106573
Fukushima, C.S. & Bertani, R. (2018) Two new species of Guyruita Guadanucci et al., 2007 (Araneae, Theraphosidae) from Brazil. Zootaxa, 4370 (4), 395–408.
https://doi.org/10.11646/zootaxa.4370.4.5
Guadanucci, J.P.L., Lucas, S.M., Indicatti, R.P. & Yamamoto, F.U. (2007) Description of Guyruita gen. nov. and two new species (Ischnocolinae, Theraphosidae). Revista Brasileira de Zoologia, 24 (4), 991–996.
https://doi.org/10.1590/S0101-81752007000400015.
Guadanucci, J.P.L. (2014) Theraphosidae phylogeny: relationships of the ‘Ischnocolinae’ genera (Araneae, Mygalomorphae). Zoologica Scripta, 43 (5), 508–518.
https://doi.org/10.1111/zsc.12065
Guadanucci, J.P.L. & Weinmann, D. (2014) The spider genera Euthycaelus Simon and Schismatothele Karsch (Mygalomorphae, Theraphosidae). Zootaxa, 3795 (3), 275–288.
https://doi.org/10.11646/zootaxa.3795.3.3
Guadanucci, J.P.L. & Weinmann, D. (2015) Description of Neoholothele gen. nov. (Araneae, Theraphosidae, Schismatothelinae). Studies on Neotropical Fauna and Environment, 50 (3), 221–228.
https://doi.org/10.1080/01650521.2015.1110309
Kaderka, R., Bulantova, J., Heneberg, P. & Rezac, M. (2019) Urticating setae of tarantulas (Araneae: Theraphosidae): Morphology, revision of typology and terminology and implications for taxonomy. PLoS ONE, 14 (11), e0224384.
https://doi.org/10.1371/journal.pone.0224384
Karsch, F. (1879) Arachnologische Beiträge. Zeitschrift für die Gesammten Naturwissenschaften, 52, 534–562.
Lüddecke, T., Krehenwinkel, H., Canning, G., Glaw, F., Longhorn, S.J., Tänzler, R., Wendt, I. & Vences, M. (2018) Discovering the silk road: Nuclear and mitochondrial sequence data resolve the phylogenetic relationships among theraphosid spider subfamilies. Molecular Phylogenetics and Evolution, 119, 63–70.
https://doi.org/10.1016/j.ympev.2017.10.015
Shorthouse, D.P. (2010) SimpleMappr, an online tool to produce publication-quality point maps. Available from: http://www.simplemappr.net (accessed 21 July 2020)
Turner, S.P., Longhorn, S.J., Hamilton, C.A., Gabriel, R., Pérez-Miles, F. & Vogler, A. P. (2018) Re-evaluating conservation priorities of New World tarantulas (Araneae: Theraphosidae) in a molecular framework indicates non-monophyly of the genera, Aphonopelma and Brachypelma. Systematics and Biodiversity, 16 (1), 89–107.
https://doi.org/10.1080/14772000.2017.1346719
Valencia-Cuéllar, D., Perafán, C., Guerrero, R.J. & Guadanucci, J.P.L. (2019) Schismatothelinae spiders (Araneae, Mygalomorphae, Theraphosidae) from Colombia: four new species and an approach to their diversity. Zootaxa, 4545 (4), 548–562.
https://doi.org/10.11646/zootaxa.4545.4.6
World Spider Catalog (2020) World Spider Catalog. Version 21.5. Natural History Museum Bern, Bern. Available from: http://wsc.nmbe.ch (accessed 21 July 2020)