Eutrecha Maury, 1982

Botero-Trujillo, Ricardo, Martinez, Leonel, Iuri, Hernan Augusto, Ojanguren-Affilastro, Andres Alejandro & Carvalho, Leonardo Sousa, 2023, Revision of the genera Eutrecha and Xenotrecha (Solifugae: Ammotrechidae), taxonomic notes on Ammotrechinae, and description of a remarkable new Eutrecha from Colombia, Arthropod Systematics & amp; Phylogeny 81, pp. 317-344 : 317

3.1.2. Eutrecha Maury, 1982

Figs 1 , 2 , 4 , 5 , 6 , 7 , 8 , 9 , 10

Eutrecha Maury, 1982: 125, 138; Harvey 2003: 210; Hernández and Colmenares 2008: 447; Acosta-Berrocal et al. 2017: 64; Villareal-Blanco et al. 2017: 139, 142, fig. 15; Iuri et al. 2021: 153.

Revised diagnosis.

A member of Ammotrechinae s.str. as herein defined. Eutrecha is presumed to be a monophyletic group of solifuges, whose males exhibit the following combination of features that allows to readily distinguish the genus from all other genera in Ammotrechinae s.l. i) Cheliceral fixed finger with FSM, FM, and FD teeth moderately reduced (i.e., evidently visible but smaller than MSM tooth of movable finger, in E. belenensis ) (Figs 2C , 5B , 6 ) to much reduced or undistinguishable ( E. florezi and E. longirostris ) (Figs 2A, B , 8B ). ii) Cheliceral fixed finger with medial notch (MN) between FM and FSM teeth, when these teeth are present (even if greatly reduced) (Figs 2B, C , 5B , 6 , 8B ). iii) Fixed finger median apical diastema (FMAD) present between FM and FD teeth, when these are present (Figs 2B, C , 5B , 8B ). iv) Flagellum without prolateral plumose setiform organ (Figs 5D , 8D ). v) Ctenidia, in the form of short “fleshy” setae, present only on 1st post-genital sternite (spiracular sternite I) (Figs 4D , 7B ).

Affinities.

In having the same or similar pattern of spiniform setae on the basitarsi and telotarsi of the walking legs and the same segmentation pattern of the leg telotarsi, Eutrecha most closely resembles Xenotrecha than it does resemble Ammotrecha .

Species composition.

Eutrecha belenensis sp. nov.; Eutrecha florezi Villareal-Blanco, Armas and Martínez 2017; Eutrecha longirostris Maury, 1982.

Figures

Figure 1. Known records of Eutrecha Maury, 1982 (squares, circles and pentagons) and Xenotrecha Maury, 1982 (crosses). Records with question mark correspond to unconfirmed record from Suriname and the unprecise type locality of X. huebneri in the headwaters of the Orinoco River, in Venezuela. See text for details.

Figure 2. Eutrecha Maury, 1982, schematic representation of cheliceral morphology, retrolateral aspect. A Eutrecha longirostris Maury, 1982, holotype ♂ (MAGS 167). B Eutrecha florezi Villareal-Blanco, Armas and Martinez, 2017, ♂ (IAvH I 472), Santuario de Flora y Fauna Los Colorados, Bolivar Department, Colombia. C Eutrecha belenensis sp. nov., holotype ♂ (ICN Aso 008). Abbreviations: FD, fixed finger, distal tooth; FM, fixed finger, medial tooth; FMAD, fixed finger, median apical diastema; FP, fixed finger, proximal tooth; FSM, fixed finger, submedial tooth; FT, fixed finger, terminal tooth; MM, movable finger, medial tooth; MN, movable finger, medial notch; MP, movable finger, proximal tooth; MRLC, movable finger, retrolateral carina; MRVC, movable finger, retroventral longitudinal carina; MSM, movable finger, submedial tooth; MT, movable finger, terminal tooth; RFA, retrofondal apical tooth; RFM, retrofondal medial tooth; RFP, retrofondal proximal tooth; RFSP, retrofondal subproximal tooth. Arrowheads in B indicate extremely reduced FSM, FM, and FD teeth.

Figure 4. Eutrecha belenensis sp. nov., holotype ♂ (ICN Aso 008), habitus, dorsal aspect (A), sinistral pedipalp basitarsus and telotarsus, prolateral (B) and ventral (C) aspects, anterior opisthosomal sternites, with spiracular sternites centered (D). Scale bars = 2 mm (A, D), 1 mm (B, C). Arrows: spiniform setae (in B and C); ctenidia on 1 st post-genital sternite (in D).

Figure 5. Eutrecha belenensis sp. nov., holotype ♂ (ICN Aso 008), dextral chelicera, retrolateral aspect (A) and close-up of fingers (B), prolateral aspect (C) and close-up of fingers and stridulatory plate (D). Scale bars = 1 mm.

Figure 6. Eutrecha belenensis sp. nov., holotype ♂ (ICN Aso 008), dextral chelicera, fixed finger, ventral aspect (A), schematic representation of fixed and movable fingers dentition, proventral aspect (B). Scale bars = 0.5 mm. Abbreviations: FD, fixed finger, distal tooth; FM, fixed finger, medial tooth; FMAD, fixed finger, median apical diastema; FP, fixed finger, proximal tooth; FSM, fixed finger, submedial tooth; FT, fixed finger, terminal tooth; MM, movable finger, medial tooth; MN, movable finger, medial notch; MP, movable finger, proximal tooth; MPL, movable finger, prolateral tooth; MSM, movable finger, submedial tooth; MT, movable finger, terminal tooth; PFM, profondal medial tooth; PFP, profondal proximal tooth; PFSM, profondal submedial tooth; PFSP, profondal subproximal tooth; RFA, retrofondal apical tooth; RFM, retrofondal medial tooth; RFP, retrofondal proximal tooth; RFSP, retrofondal subproximal tooth.

Figure 7. Eutrecha florezi Villareal-Blanco, Armas and Martinez, 2017, ♂ (IAvH I 472), Santuario de Flora y Fauna Los Colorados, Bolivar Department, Colombia, propeltidium (A), anterior opisthosomal sternites with spiracular sternites centered (B) [arrows indicate paramedian areas with ctenidia on 1 st post-genital sternite], dextral chelicera, stridulatory plate, prolateral aspect (C) [note the modified stridulatory apparatus]. Scale bars = 1 mm (A, C), 0.5 mm (B).

Figure 8. Eutrecha florezi Villareal-Blanco, Armas and Martinez, 2017, ♂ (IAvH I 472), Santuario de Flora y Fauna Los Colorados, Bolivar Department, Colombia, dextral chelicera, retrolateral aspect (A) and close-up of fingers (B), prolateral aspect (C) and close-up of fingers (D). Scale bars = 1 mm (A, C), 0.5 mm (B, D).

Figure 9. Eutrecha florezi Villareal-Blanco, Armas and Martinez, 2017, sinistral chelicera, retrolateral aspect (A), prolateral aspect (B), and ventral aspect of fixed finger (C), dextral chelicera, fixed finger, ventral aspect (D). A - C ♀ (MPUJ ENT 61896), San Jacinto, Bolivar Department, Colombia. D ♂ (IAvH I 472), Santuario de Flora y Fauna Los Colorados, Bolivar Department, Colombia. Scale bars = 1 mm (A, B), 0.5 mm (C, D).

Figure 10. Landscape (A) and habitat (B) of Eutrecha florezi Villareal-Blanco, Armas and Martinez, 2017 at type locality in San Jacinto, Bolivar Department, Colombia.