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A Taxonomic Review of the Crab Spider Genus

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A Taxonomic Review of the Crab Spider Genus ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Zoosystematics and Evolution Jahr/Year: 2019 Band/Volume: 95 Autor(en)/Author(s): Machado Miguel, Guzati Catherine, Viecelli Rafaela, Molina- Gomez Diana, Teixeira Renato Augusto Artikel/Article: A taxonomic review of the crab spider genus Sidymella (Araneae, Thomisidae) in the Neotropics 319-344 Creative Commons Attribution 4.0 licence (CC-BY); original download https://pensoft.net/journals Zoosyst. Evol. 95 (2) 2019, 319–344 | DOI 10.3897/zse.95.34958 A taxonomic review of the crab spider genus Sidymella (Araneae, Thomisidae) in the Neotropics Miguel Machado1, Catherine Guzati1, Rafaela Viecelli1, Diana Molina-Gómez1, Renato Augusto Teixeira1 1 Laboratório de Aracnologia, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Avenida Ipiranga 6681, Porto Alegre, RS, Brazil http://zoobank.org/1AC7C423-2E9A-42B0-AD01-902985656BE6 Corresponding author: Miguel Machado (machadom.arachno@gmail) Academic editor: Danilo Harms ♦ Received 28 March 2019 ♦ Accepted 2 May 2019 ♦ Published 29 May 2019 Abstract Four Neotropical species of Sidymella Strand, 1942, S. furcillata Keyserling, 1880, S. longispina (Mello-Leitão, 1943), S. lucida (Keyserling, 1880), and S. kolpogaster (Lise, 1973) are redescribed from both sexes. The holotype of S. nigripes (Mello-Leitão, 1947) is lost and this taxon is considered a species inquierenda. Sidymella obscura (Mello-Leitão, 1929), S. parallela (Mello-Leitão, 1929), and S. spinifera (Mello-Leitão, 1929) are all nomina dubia. Two new species are described: Sidymella excavata sp. nov. (males and females) and S. marmorata sp. nov. (female). Key Words crab spiders, morphology, new records, Stephanopinae, Stephanopis Introduction Lise 2001; Machado et al. 2015, 2017; Silva-Moreira and Machado 2016; Prado et al. 2018). However, many gen- Crab spiders (Araneae, Thomisidae) are distributed era are still known only from the original descriptions and worldwide but the highest diversity is found in tropical poor diagnoses, and the accurate identification of many regions (WSC 2019). The group has been studied in many species is practically impossible. recent phylogenetic works, but its relationships are still The genus Sidymella Strand, 1942 is a prime example being discussed (Benjamin et al. 2008; Benjamin 2011; of such difficulties. The genus has a disjunct Gondwanan Ramírez 2014; Wheeler et al. 2017) and broader rela- distribution, with 11 described species occuring in Austra- tionships among basal thomisids such as the subfamily lia and New Zealand whilst 10 are found in the Neotropics Stephanopinae remain weakly supported and unstable (WSC 2019). Sidymella is currently defined by a convex (Ramírez 2014). The presence of cheliceral teeth, which prosoma, both anterior and posterior eye rows recurved, was previously considered as a synapomorphy for this anterior tibiae and metatarsi (I and II) with stout and spin- group (Ono 1988), was recovered as a plesiomorphy by iform macrosetae, and opisthosoma posteriorly bifurcated Benjamin (2011), and this subfamily remains as the most (Strand 1942; Mello-Leitão 1929; Lise 1973). Although controversial and the least studied group in Thomisidae; the Neotropical Sidymella have been revised by Lise it has many genera in need of revision and a considerable (1973), this author focused on somatic characters to de- number of species yet to be described (Benjamin 2011). scribe and diagnose the species, neglecting both external Based on the work of Mello-Leitão (1929), subsequent and internal structures of female genitalia and the position, efforts were made to update the taxonomy of some Neo- shape, and size of palpal apophyses of males. Therefore, tropical stephanopines (Lise 1973, 1981; Bonaldo and the present paper provides a taxonomic review of the Neo- Copyright Miguel Machado et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Creative Commons Attribution 4.0 licence (CC-BY); original download https://pensoft.net/journals 320 Miguel Machado et al.: Taxonomic review of Neotropical Sidymella tropical Sidymella, where the males of S. furcillata and S. Description. Small spiders (total length 3.00–3.96 in longispina are described for the first time, two new species males, 4.68–7.93 in females) with slight sexual size di- added to the genus, and new synonyms established. morphism, presenting evidence of predominant green colouration in vivo (Fig. 1E, F). Prosoma longer than wide, covered with short and conical setae. Both ante- Methods rior and posterior eyes disposed in two recurved rows; ALE almost two times larger than the other eyes; ocular The examined specimens belong to the Museo Argentino macrosetae may be present only above the ALE or on the de Ciencias Naturales “Bernardino Rivadavia”, Buenos MOQ area; sternum heart-shaped with concave anteri- Aires (MACN, Martín Ramírez), Museu de Ciências e or border, and clypeus with a pair of macrosetae; labi- Tecnologia da Pontifícia Universidade Católica do Rio um trapezoidal and endites with rounded edges, longer Grande do Sul, Porto Alegre (MCTP, A. A. Lise), Museu than wide. Opisthosoma with two projections of different de Ciências Naturais da Fundação Zoobotânica do Rio sizes, shapes and angles in relation to the opisthosomal Grande do Sul, Porto Alegre (MCN, R. Ott), and the Mu- axis, varying from rounded and short ones, disposed hor- seum of Comparative Zoology of Harvard, Cambridge izontally/posteriorly, or long, acute and vertically orient- (MCZ, G. Giribet and L. Liebensperger). ed (Figs 2A–F, 3A–F). Leg formula: 1–2–4–3; anterior The terminology for somatic and copulatory structures tibiae and metatarsi (I and II) ventrally armed with stout follows Machado et al. (2018). Photos of copulatory struc- macrosetae. Epigynum with membranous and hyaline tures were taken with a Multipurpose Zoom Microscope copulatory ducts, long spermathecae with many cham- Leica M205A with a digital camera, and scanning electron bers or with a single median constriction (Fig. 10D); male microscopy were made with a Philips XL 30 Field Emis- palp with RTA rounded or truncated, discoid tegulum and sion ESEM from the Centro de Microscopia e Microanális- ribbon-like embolus and (Fig. 10C–F). es (CEMM) of the Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS). All measurements were taken in Composition. Six Neotropical species: Sidymella excav- millimeters. Morphology abbreviations: ALE—anterior ata sp. nov., S. furcillata (Keyserling, 1880), S. longispi- lateral eyes, AME—anterior median eyes, MOQ—median na (Mello-Leitão, 1943), S. lucida (Keyserling, 1880), S. ocular quadrangle, PLE—posterior lateral eyes, PME— marmorata sp. nov., and S. kolpogaster (Lise, 1973); 11 posterior median eyes, RTA— retrolateral tibial apophysis. additional species from the Australasian region that are not within the scope of the present study. Results Distribution. Ecuador, Colombia, Peru, Brazil, Argenti- na, and Uruguay (Fig. 15). Sidymella Strand, 1942 Sidyma Simon, 1895: 1056. Type species: Stephanopis lucida Keyser- ling, 1880; by original designation and monotypy; Berland 1913: Sidymella excavata Machado & Guzati, sp. nov. http://zoobank.org/4D59E033-C71C-4588-ADBC-6563B92ACDAE 95, pl. 9, figs 51–56. Preoccupied by Walker (1856) in Lepidoptera. Figures 2D, 3D, 4, 5 Sidymella Strand, 1942: 399 (generic replacement name). Diagnosis. Sidymella is similar to Coenypha Simon, Type material. Holotype ♀, ECUADOR: Cerro 1895 and some species of Stephanopis (e.g. S. antenna- Troya, Carchi, 0°43'59.7"N, 77°41'00.3"W, L. Pena leg. ta, S. ditissima, and S. nodosa) and these species share a (MCZ 133396). Paratypes: ♂, ECUADOR: Pichincha, male palp with a long, thin and curled embolus, well-de- 0°15'00.0"S, 78°35'00.0"W, 19.iv.1988, W. Maddison veloped pars pendula, and a retrolateral tibial apophysis leg. (MCZ 133397); ♀, COLOMBIA: Cundinamarca, with a short basal branch (Figs 1A, B, 11C–F, 13D); the Mosquera (Mondoñedo), 4°41'0.06"N, 74°15'0.25"W, epigynes have a septum formed by the posterior folds of 20.x.2000, E. Florez & J. Pinzon leg. (ICN 3404). the epigynal plate and long and coiled copulatory ducts (Figs 1C, D, 10C–F). However, Sidymella species can be Material examined. COLOMBIA: 2j, Magdalena (San- recognized and distinguished from these genera by hav- ta Marta), 11°12'54"N, 74°06'01"W, 18.iv.1977, W. Gal- ing a bifid opisthosoma (Fig. 1E, F), presence of spini- vis & A.J. Moreno leg. (ICN-Ar 9140); 1♀ 1j, Quindío form macrosetae on the mesial surface of femora I and (Estación Bremen), 4°40'0"N, 75°39'0"W, 14–20.iv.1998, above the ALE (Fig. 10A, B), the epigyne have a single P. Ariza leg. (MPUJ 45511); 1♀, 1j, same data as preced- pair of walnut-shaped spermathecae compartmentalized ing (MPUJ 11490); 1♀, Cundinamarca, Mosquera (via a in several smaller chambers, with accessory glandular La Mesa), 4°40'12.0"N, 74°16'00.7"W, 20.x.2000, E. Flo- heads (Figs 4D, F, 6D, F, 8D, F, 10D, F, 12D, F, 13D, rez & J. Pinzon leg. (ICN-Ar 3404); 2♀, Mosquera (De- F) while the male palp has a tibial trichobothrium and sierto de Zabrinsky), 4°44'30"N, 74°14'8"W, 23.ii.2002, the RTA have a nodose surface (Fig. 1A, B) unlike other L. Benavides, C. Niño, A. Castañeda & G. Mora leg. Stephanopinae which present a grooved RTA (with paral- (ICN-Ar 2157); 2♀, 5j, 06.iv.2002, same locality and col- lel creases on its surface). lectors (ICN-Ar 2146); 4♀, 7j, same locality, April 2006, zse.pensoft.net Creative Commons Attribution 4.0 licence (CC-BY); original download https://pensoft.net/journals Zoosyst. Evol. 9@ (@) 2019, ##–## 321 Figure 1. a–d Diagnostic sexual features of Sidymella a Detail of the nodose RTA surface on male palp b Tibial trichobothria on male palp (indicated by an arrow) c Glandular head on spermatheca d Walnut-shaped spermatheca e, f Photos of live specimens of Sidymella lucida.
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