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Eusarcus minutus (S��rensen, 1884) comb. nov. Pachylus minutus S��rensen 1884: 643. Type series: eight specimens from ���Monte Rita��� (MR) in Paraguay and 28 individuals from ���Riacho del Oro��� (RO), Argentina, all male and female syntypes. A part of the type series was detected in several institutions and examined: ZMUC (17 specimens from RO, 1 from MR), ZMB (2 specimens from RO), BMNH (2 specimens from MR). urn:lsid:zoobank.org:act: D93DBB9B-A3DC-474A-9510-E49A97073908 Pucrolia minuta: S��rensen 1895: 3; Roewer 1913: 16, fig. 1; Ringuelet 1959: 375, Pl. 2, fig. 6; Kury 2003: 188 [complete synonymy]. Pachylus gracilipes Canestrini 1888: 107, Pl. 9, figs. 4, 4a-d. Type not found, presumably one female holotype from Resistencia, Chaco (Argentina). urn:lsid:zoobank.org:act: E439AEC6-9BD6-431C-9A42-B8F39E4E6AC0. Syn. nov. Pucrolia gracilipes: Roewer 1913: 17 (Unsichere Art! = species uncertain); Ringuelet 1959: 373 (species inquirenda); Kury 2003: 188 (species inquirenda). The general habitus of Eusarcus minutus comb. nov. (Fig. 1A) resembles closely most species in the genus. The main shared features include the three well-developed paracheliceral frontal apophyses, the shape and curvature of the prolateral apophysis on coxa IV of males, the triangular, short, blunt prolateral apophysis on the male trochanter IV, and male femur IV with prolateral and retrolateral rows of apophyses and two distinct ventroapical ones (Hara & Pinto-da-Rocha 2010). Unlike most Eusarcus species, which typically bear a median conic apophysis on the scutal area III, E. minutus lacks any armature on the scutum, a feature shared with a few other species, like e.g. E. sergipanus Hara & Pinto-da-Rocha, 2010, E. gemignanii (Mello-Leit��o, 1931) and E. uruguayensis (Ringuelet, 1955). In addition, the ocular mound of E. minutus is armed by a single apophysis (Fig. 1A), instead of the paired armature most frequent in genus Eusarcus (Hara & Pinto-da-Rocha 2010). The referred character states were used by Ringuelet (1959) to separate Pucrolia from Eusarcus. The tarsal formula 5-6-6-6 of the nominal genus Pucrolia (of little help) is shared with E. gemignanii, E. grumani H. Soares, 1966 and E. uruguayensis. Finally, the male genitalia of Eusarcus minutus (Fig. 1B���C) consistently match the descriptions of those of most Eusarcus species (cf. Hara & Pinto-da-Rocha 2010). As for the largely questioned Pucrolia gracilipes, it is to be considered a junior synonym of E. minutus. The type material of the former is presumably lost (Guariento et al. 2018), but drawings and description given by Canestrini (1888: 107, Pl. 9, figs. 4, 4a-d) clearly show a female E. minutus. The type locality of P. gracilipes (Resistencia, Chaco province, Argentina) is placed in middle of the geographic range of E. minutus (cf. Ringuelet 1959)., Published as part of Acosta, Luis E. & Guerrero, Eli��n L., 2021, The missing Eusarcus: generic relocation of Pucrolia minuta, with synonymic notes (Opiliones: Laniatores: Gonyleptidae), pp. 587-590 in Zootaxa 4990 (3) on pages 588-589, DOI: 10.11646/zootaxa.4990.3.11, http://zenodo.org/record/5026901, {"references":["Sorensen, W. (1884) Opiliones Laniatores (Gonyleptides W. S. Olim) Musei Hauniensis. Naturhistorisk Tidsskrift, Series 3, 14 (3), 555 - 646.","Sorensen, W. (1895) Viaggio del dottor Alfredo Borelli nella Repubblica Argentina e nel Paraguay. XVII. Opiliones Laniatores. Bollettino dei Musei di Zoologia ed Anatomia Comparata della R. Universita di Torino, 10 (210), 1 - 6.","Roewer, C. F. (1913) Die Familie der Gonyleptiden der Opiliones-Laniatores. Archiv fur Naturgeschichte, 79 A (4), 1 - 256.","Ringuelet, R. A. (1959) Los aracnidos argentinos del orden Opiliones. Revista del Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Ciencias Zoologicas, 5 (2), 127 - 439, pls. I - XX.","Kury, A. B. (2003) Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones). Revista Iberica de Aracnologia, Volumen especial monografico, 1, 5 - 337.","Canestrini, G. (1888) Intorno ad alcuni Acari ed Opilionidi dell' America. Atti della Societa Veneto-Trentina di Scienze Naturali, Padova, Series 1, 11 (1), 100 - 111.","Hara, M. R. & Pinto-da-Rocha, R. (2010) Systematic review and cladistic analysis of the genus Eusarcus Perty 1833 (Arachnida, Opiliones, Gonyleptidae). Zootaxa, 2698 (1), 1 - 136. https: // doi. org / 10.11646 / zootaxa. 2698.1.1","Mello-Leitao, C. F. de (1931) Notas sobre arachnideos argentinos. Annaes da Academia Brasileira de Ciencias, 3 (2), 83 - 97.","Ringuelet, R. A. (1955) Noticias sobre opiliones del Uruguay. Notas del Museo de La Plata, Zoologia, 18 (163), 279 - 297.","Soares, H. E. M. (1966) Opilioes da colecao Gofferje (Opiliones: Gonyleptidae, Phalangodidae). Papeis Avulsos do Departamento de Zoologia, Sao Paulo, 18 (10), 87 - 102.","Guariento, L. A., Bonvicini, M. C., Ballarin, L., Devincenzo, U., Gardini, G., Moretto, E., Pantini, P. & Nicolosi, P. (2018) Giovanni Canestrini's heritage at the Zoology Museum of Padova University (Italy): a rediscovery of his arachnological collections and described species. Arachnologische Mitteilungen / Arachnology Letters, 55 (1), 36 - 41. https: // doi. org / 10.30963 / aramit 5506"]}

La provincia de Buenos Aires más la Ciudad Autónoma de Buenos Aires, República Argentina, albergan una variada gama de fisonomías, desde selvas en galería en su sector norte a matorrales xerófilos en el sur. El objetivo de este trabajo es confeccionar una lista de especies de opiliones de todas las áreas protegidas de las que se cuente con información dentro de dicho territorio. Se obtuvieron registros de 17 especies en 30 áreas protegidas. La mayoría de las áreas con registros de opiliones se encuentra en el noreste del área de estudio; existen pocas áreas protegidas en los sectores central y austral, y no hay superficies protegidas en el sector oeste de Buenos Aires. Algunas áreas de gran importancia para la conservación de la biodiversidad (ej. reservas naturales en los partidos de San Nicolás, Zárate, Cañuelas, Azul, Tornquist, San Cayetano, Coronel Dorrego, etc.) aún no han sido prospectadas para conocer su composición de especies de opiliones. De acuerdo con el esquema zoogeográfico basado en el orden Opiliones, la mayoría de las áreas protegidas poseen fauna mesopotámica, pampeana o de ambas, y la fauna central se encuentra escasamente protegida. The province of Buenos Aires plus Autonomous City of Buenos Aires, Argentina, house a varied range of physiognomies, from gallery forests in its northern sector to xerophilous scrubs in the south. The objective of this work is to compile a list of harvestmen species from all the protected areas of which information is available within that territory. Records of 17 species in 30 protected areas were obtained. Most of the areas with harvestmen records are located in the northeast of the province; there are few protected areas in the center and south, and there are not protected areas in western Buenos Aires. Some areas of great importance for the conservation of biodiversity (e.g., natural reserves in San Nicolás, Zárate, Cañuelas, Azul, Tornquist, San Cayetano, Coronel Dorrego, etc.) have not yet been prospected to know their harvestmen composition. According to the zoogeographic scheme based on order Opiliones, most of the protected areas have Mesopotamian fauna, Pampean fauna, or both, and the Central fauna is poorly protected.

La pérdida de hábitat es uno de los procesos más graves que afectan la diversidad biológica. Los pastizales del sureste de América del sur son uno de los biomas más afectados por este proceso debido a diversos factores relacionados a las actividades humanas. El objetivo de este trabajo es evaluar la pérdida de biodiversidad en la Reserva Natural Santa Catalina como un modelo para visualizar este proceso en las Pampas húmedas del sureste de América del Sur. Para ello se compararon los listados de especies que actualmente habitan la reserva con colecciones y trabajos publicados antes de 1970 para detectar qué componentes del ecosistema se han perdido. Se contabilizaron 27 especies de plantas y 12 especies de aves que se extinguieron de la localidad. Un 100 % de las plantas y un 83% de las aves son especies que crecen o habitan en pastizales nativos. Por otra parte, de entre estas, cinco especies de plantas y dos de aves se han extinto a nivel regional. La vulnerabilidad de los pastizales de la región queda evidenciada por estos valores, y se discuten algunos factores que pueden haber causado esta pérdida. Habitat loss is one of the most serious processes that affect biological diversity. The grasslands of southeastern South America are one of the most affected biomes by this process due to various factors related to human activities. The objective of this work is to evaluate the loss of biodiversity in the Reserva Natural Santa Catalina as a model to visualize this process in the Pampas of southeastern South America. For this, the lists of species that currently inhabit the reserve were compared with collections and works published before 1970 to detect which ecosystem components were lost. 27 species of plants and 12 species of birds that became extinct from the locality were counted. 100% of the plants and 83% of the birds are species that grow or inhabit native grasslands. On the other hand, among these, five species of plants and two of birds have become extinct at the regional level. The vulnerability of grasslands in the region is evidenced by these values, and some factors that may have caused this loss are discussed.