Pseudocleobis solitarius : Maury 1976: 87–94 Maury 1983: 172 The genus Pseudocleobis Pocock, 1900 (Solifugae: Ammotrechidae) in transitional Patagonia-Monte deserts, with descriptions of two new species Iuri, Hernán A. Iglesias, Mónica S. Zootaxa 2022 2022-02-04 5094 3 435 460 4NTV7 Maury, 1976 : Maury 1976 [151,608,618,645] Arachnida Ammotrechidae Pseudocleobis Animalia Solifugae 17 452 Arthropoda species solitarius  ( Figs. 2D–F; 5; 6D, E; 8C–E; 9F; 10F; 11D; 12J–L; 15. Table 1, table 2)      Pseudocleobis solitarius: Maury 1976: 87–94–101, figs.: 24–25;  Maury 1983: 172.   Type material (examined).   Holotype: ARGENTINA: Río Negro: ♂, Paso Córdoba[ 39º06’47,46’’S 67º37’34,08’’W], General Roca,  I.1961, A. Bachmanncoll., (MACN-Ar 6886);   Paratypes: ARGENTINA: Río Negro: 1♂, General Conesa[ 40º06’14,71’’S 64º27’30,59’’W],  16.II.1941, M. Birabéncoll., (MACN-Ar 6887).  Other examined material:   ARGENTINA: Mendoza: 3♂, 1♀, El Nihuil[ 35º01’40,53’’S 68º40’20,51’’W],  8.XI.1952, R. Cottacoll., (MACN-Ar 7589);   Neuquén: 1♂, Arroyito[ 39º04’09,53’’S 68º33’54,11’’W],  7.I.1986. M. & P. Gentilécoll., (MACN-Ar);   Río Negro: 1♂, San Antonio Oeste[ 40º43’48,82’’S 64º56’19,98’’W],  19.I.1994, A. Roigcoll., (MACN-Ar);  7♂, 11♀, 1 immature, Paso Córdoba, near the Nautical Club“Julio A. Trulls” [ 39º06’46,16’’S 67º37’12,45’’W],  16–21.I.2015, H.A. Iuricoll., (MACN-Ar);  5♂, 2♀, same locality and collector,  I-2016, (MACN-Ar);  5♂, 1♀, Valcheta, near the abandoned fluorite factory [ 40°39’58,87”S 66°10’13,84”W],  10– 12.I.2015, H.A. Iuricoll., (MACN-Ar);  3♂, Playas Doradas, “sendero del cuis” [ 41°38’46.55”S 65° 1’27.64”W],  8–10.I.2015, H.A. Iuricoll., (MACN-Ar).   Materialtentatively assigned to  P. solitarius:   Argentina: San Juan: 1♂, Ichigualasto[ 30º09’49,70’’S 67º50’32,98’’W],  17.XII.1979, E.A. Maury& A. Roigcoll., (MACN-Ar 7590);  1♂, Bermejo[ 31º35’21,68’’S 67º39’32,67’’W],  15.XII.1979, E.A. Maury& A. Roigcoll., (MACN-Ar 7591).   Diagnosis:The flagellum attached at level between FSD and FM teeth ( Fig. 8D), and the stylet-like fixed finger mucron on males ( Figs. 8C; 12J) are characteristic for this species.  Pseudocleobis solitariusresembles  P. mustersi, in the shape on the flagellum-mucron complex. However,  P. mustersihas other unique modifications on the chelicerae such as a bifurcated movable finger mucron. All the others  Pseudocleobisexamined have a wider shaped flagellum with an attachment ring at level between the FSMand FP teeth or posterior. Note: The female of  P. solitariushas a wide, bell-shaped genital plate with a large oval opening in the middle ( Fig. 10F). This shape is different from all other described females of  Pseudocleobis. However, as the female genital plate has been proved to be uninformative at the species level in some cases (see  P. huinca,  P. bardensisand  P. profanus), and the females of some species from southern Patagonia are unknown (e.g.,  P. mustersi,  P. levii) we prefer not mention it as diagnostic for the species.   Redescription: Male:measurements in Table 1. Color in vivo( Fig. 2E–F). Specimens of the population from the typelocality possess a whitish body coloration pattern with beige legs.  Color in 96 % ethanol. The pattern in alcohol is quite similar to the live specimens, except that the body turns more whitish and legs turn darker.  Morphology and Chaetotaxy: General body chaetotaxy as described for  P. profanus. Fixed finger( Figs. 8C–D; 12J): the fixed finger mucron is much narrower than the movable finger mucron ( Fig. 8C, D). The FSD smaller than FD and FM, but generally well developed, not vestigial ( Fig. 8D). The FSMand FM teeth are separated by a short diastema. Movable finger( Fig. 8C–D): the movable finger is robust and possesses a wide dorsal crest on the mucron. The three teeth (MM, MSM, MP) are widely separated from each other. Flagellum( Figs. 8D; 9F; 12J): the flagellum in very narrow ( Fig. 9F) with small attachment ring placed at level between FSD and FM teeth ( Fig. 8D). The flagellum reaches almost the tip of mucron ( Figs. 8D; 12J). The central portion of the prolateral surface possesses some prominent filaments ( Fig. 12J). The membrane, in general, is thicker than the flagellum of the other species treated here, and with some flat filaments in the retrolateral surface. The apex has some surface roughness and a few, very small, projections. Pedipalps( Fig. 15A–C): chaetotaxy as described for  P. profanus  sp. nov.except that the spiniform setae are more setiform (thin and undulate), more equally sized (especially those of the tibia), and the clubbed setae were not seen. Leg I( Fig. 15D–F): similar to  P. profanus, but the clubbed setae ( Fig. 15F) are less abundant. Opisthosoma:ctenidia: 5-5 on sternite III and 4-4 on sternite IV ( Fig. 15J).  Female:Measurements in Table 1. Color in vivo: As in Fig. 2D. Morphology and chaetotaxy similar to male, except by wider propeltidium, wider chelicerae, and more robust body in general ( Fig. 2D). Pigment pattern similar to males. The spiniform setae of the pedipalps are more spiniform than in males (especially those of the tibia). Genital plate( Fig. 10F): the genital plate is relative wide, bell-shaped. There is a large oval opening in the middle, covered distally by two whitish rigid plates. The lateral margins are straight or concave. Short, thick, bifurcated tip setae are placed on the lateral margins.   TABLE 2.Variability report of cheliceral dentition on both sexes of the species  Pseudocleobis huincaand  Pseudocleobis solitarius. The (+1) indicates an additional denticle, for example MP (+1) MSM= 1 additional denticle between MP and MSM. For more than one modification, these are separated by semicolon (;), for example FSD absent; MP (+1) MSM= FSD absent and 1 additional denticle between MP and MSM.   P. huinca♂     n = 40 Left Chelicera Right Chelicera  26 normal normal  4 FSD absent normal  3 normal FSD absent  2 FSD absent FSD absent  2 normal RFSM (+1) RFM  1 normal MSM (+1) MM  1 RFSM (+1) RFM FSD absent  1 FSD absent; MP (+1) MSM FSD absent    P. huinca♀  n = 20 Left Chelicera Right Chelicera  13 normal normal  2 normal RFSM (+1) RFM  1 normal MP (+1) MSM  1 MP (+1) MSM normal  1 normal RFM (+1) FP  1 normal RFP (+1) RFSM  1 FSD (+1) FD normal    P. solitarius♂  n = 8 Left Chelicera Right Chelicera  7 normal normal  1 PFSM absent PFSM absent    P. solitarius♀  n = 8 Left Chelicera Right Chelicera  3 normal normal  2 normal RFP (+1) RFSM  1 (+1) RFSP normal  1 (+1) RFSP RFP (+1) RFSM  1 RFSM (+1) RFM; MP (+1) MSM normal   FIGURE 13.  Pseudocleobis huinca. A–C.Male. D–E.Female. A.Right pedipalp (tibia, basitarsus and telotarsus), retrolateral view, retroventral spiniform setae in light blue, proventral spiniform setae in yellow. B.Right telotarsus IV, retrolateral view, retroventral spiniform setae in light blue, proventral spiniform setae in yellow. C.Left pair of microsetae on genital sternite (sternite II). D.Left microseta on sternite V. E.Genital sternite, ventral view, position of microsetae in small yellow circle, detail of left pair of microsetae in large yellow circle. Scale bars: 4 μm ( D), 6 μm (detail in E), 20 μm ( C), 200 μm ( E), 1 mm ( B), 2 mm ( A).   FIGURE 14.  Pseudocleobis profanus  sp. nov., male. A–C.Right pedipalp. A.Slit sensilla. B.Tapered seta tip. C.Clubbed seta tip. D–F.Right leg I. D.Apex of telotarsus, apical seta in light blue. E.Detail of apical seta. F.Clubbed seta tip. G–I.Right malleoli. G.Frontal view. H.Surface detail. I.Detail of projections. J–L.Sternite microseta. J.Right pair of microseta on sternite IV, detail of each microseta tip on yellow circles. K.Left pair of microseta on sternite IV. L.Right microseta on sternite V. Scale bars: 300 nm (both details in J), 400 nm ( B), 2 μm ( F, H–I), 3 μm ( C), 4 μm ( K–L), 6 μm ( A, J), 20 μm ( E), 60 μm ( D), 200 μm ( G).   FIGURE 15.  Pseudocleobis solitariusmale. A–C.Right pedipalp. A.Telotarsus, retrodorsal view. B.Detail of sensilla ampullacea. C.Tapered seta tip. D–F.Right leg I. D.Apex of telotarsus, apical seta in ligh blue. E.Detail of apical seta. F.Clubbed seta tip. G–I.Right telotarsus IV. G.Detail of pseudosegmentation. H.Terminal tarsomere and arolium. I.Detail of distal seta with comb-like structure. J.Sternites III and IV, filiform ctenidia in light blue. Scale bars: 600 nm ( B), 900 nm ( C), 2 μm ( F), 6 μm ( E, I), 60 μm ( D, H), 90 μm ( G), 200 μm ( A, J).  Variability:Dentition variability on both sexes is detailed in Table 2. Acareful examination shows that the dark brown areas on propeltidium and chelicerae of  P. huinca, are whitish in the specimens of  P. solitariusfrom Paso Córdoba. That coloration allows to easily distinguishing it from  P. huinca(found in sympatry in the typelocality). However, specimens of  P. solitarius, from other populations (i.e., Playas Doradas and Valcheta), possess some brown pigment similar to  P. huinca(also found in sympatry on these localities), so they cannot be easily distinguished by the coloration in these areas.   Distribution:The records of  P. solitariusare from the Austral and Septentrional districts of the Monte biogeographic province ( Figs. 1A–B, D; 5). However, we found females of  Pseudocleobiswith the  P. solitariusgenital plate shape at the MACN collection, from the Chubutand Santa Cruzdistricts of the Patagonian biogeographic province. As we could not study males from these localities, these females are included in the distribution map as  solitariusshape. The males recorded by Maury (1983)for San Juan provincehave some slight differences in the shape of cheliceral fingers mucra, and they could belong to a different species. However, due to the scarcity of material, we maintain these here as  P. solitarius.  Examined material of  Pseudocleobissp.(females  solitariusshape):   ARGENTINA: Chubut: 1♀,  15 kmS of Los Tamariscos,  19.I.1977, E.A. Mauryand Petricchacoll., (MACN-Ar);  1♀, Puerto Lobos,  1.II.2016, E.A. Maurycoll., (MACN-Ar);  1♀, Puerto Lobos, Arroyo Verde,  25–26.I.1975, E.A. Maury, C. Césariand P. Domínguezcoll., (MACN-Ar);  1♀, Puerto Madryn,  XII.1981, P. Goloboffcoll., (MACN-Ar);  1♀, Telsen,  XII.1981, P. Goloboffcoll., (MACN-Ar);  1♀, Rada Tilly, near Punta del Marqués[ 45°57’8.33’’S 67°33’7.35’’W],  28–30.I.2015, H.A. Iuricoll., (MACN-Ar);   Río Negro: 1♀, 5 kmof Moligue,  1500 masl,  20.I.1973, (MACN-Ar);  1♀, Sierra Grande, near the cemetary [ 41º36’16.62’’S 65º23’12.77’’W],  19–20.I.2016, H.A. Iuricoll., (MACN-Ar). 3462253308 1961-01 General Roca & A. Bachmann Argentina -39.113182 Paso Cordoba 1 -67.62614 17 452 1 1 Rio Negro holotype 3462253309 1941-02-16 M. Biraben Argentina -40.104084 General Conesa 1 -64.458496 17 452 1 1 Rio Negro paratype 3462253307 1952-11-08 El Nihuil & R. Cotta Argentina -35.027924 Mendoza 1 -68.67236 17 452 4 1 3 Mendoza 3462253331 1986-01-07 M. & P. Gentile Argentina -39.069313 Arroyito 1 -68.56503 17 452 1 1 Neuquen 3462253347 1994-01-19 A. Roig Argentina -40.73023 San Antonio Oeste 1 -64.93888 17 452 1 1 Rio Negro 3462253310 2015-01-16 2015-01-21 2015-01-16 H. A. Iuri Argentina -39.11282 Nautical Club 1 -67.620125 Paso Cordoba 17 452 19 11 1 7 Rio Negro 3462253318 2016-01 2015-01-21 2015-01-16 H. A. Iuri Argentina -39.11282 Nautical Club 1 -67.620125 Paso Cordoba 17 452 7 2 5 Rio Negro 3462253344 2015-01-10 2015-01-12 2015-01-10 H. A. Iuri Argentina -40.666355 Valcheta 1 -66.17051 17 452 6 1 5 Rio Negro 3462253322 2015-01-08 2015-01-10 2015-01-08 H. A. Iuri Argentina -41.646267 Playas Doradas 1 -65.024345 17 452 3 3 Rio Negro 3462253320 1979-12-17 E. A. Maury & A. Roig Argentina -30.163805 Ichigualasto 1 -67.8425 17 452 1 1 San Juan 3462253336 1979-12-15 E. A. Maury & A. Roig Argentina -31.589355 Bermejo 1 -67.65907 17 452 1 1 San Juan 3462253343 1977-01-19 E. A. Maury & Petriccha Argentina 15 km S of Los Tamariscos 22 457 1 1 Chubut 3462253335 2016-02-01 E. A. Maury Argentina Puerto Lobos 22 457 1 1 Chubut 3462253312 1975-01-25 1975-01-26 1975-01-25 E. A. Maury & C. Cesari & P. Dominguez Argentina Arroyo Verde Puerto Lobos 22 457 1 1 Chubut 3462253306 [368,1052,726,753] 1981-12 P. Goloboff Argentina Puerto Madryn 22 457 1 1 Chubut 3462253325 1981-12 P. Goloboff Argentina Telsen 22 457 1 1 Chubut 3462253323 2015-01-28 2015-01-30 2015-01-28 H. A. Iuri Argentina -45.952316 Punta del Marques 1 -67.55205 Rada Tilly 22 457 1 1 Chubut 3462253330 [371,1158,797,825] 1973-01-20 Argentina 1500 Moligue 22 457 1 1 Rio Negro 3462253305 2016-01-19 2016-01-20 2016-01-19 H. A. Iuri Argentina -41.604614 Sierra Grande 1 -65.38688 22 457 1 1 Rio Negro