Xenotrecha 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

3.1.6. Xenotrecha Maury, 1982

Figs 1 , 3 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19

Xenotrecha Maury, 1982: 125, 134; Rocha and Cancello 2002b: 1, 2; Harvey 2003: 210; Hernández and Colmenares 2008: 447; Acosta-Berrocal et al. 2017: 64: Iuri et al. 2021: 153.

Revised diagnosis.

A member of Ammotrechinae s.str. as herein defined. Xenotrecha remains a monotypic genus containing only X. huebneri , whose male exhibits 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 FM and FD teeth well developed, of normal size for primary teeth (Fig. 3B ). ii) Cheliceral fixed finger with the median teeth series uninterrupted, without medial notch or median apical diastema (Figs 3B , 14E , 15A ). iii) Flagellum with prolateral plumose setiform organ (Figs 14F , 16A, B ). iv) Ctenidia, in the form of short and thick lanceolate setae, present only on 1st and 2nd post-genital sternites (spiracular sternites) (Fig. 13C ).

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, Xenotrecha most closely resembles Eutrecha than it does resemble Ammotrecha .

Species composition.

Xenotrecha huebneri (Kraepelin, 1899).

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 3. Xenotrecha huebneri (Kraepelin, 1899), schematic representation of cheliceral morphology, retrolateral aspect. A ♀ (CHNUFPI 1248), Serra do Tepequem, Roraima State, Brazil. B ♂ (CHNUFPI 1247), same locality. Abbreviations: FD, fixed finger, distal tooth; FM, fixed finger, medial tooth; FP, fixed finger, proximal tooth; FSM, fixed finger, submedial tooth; MM, movable finger, medial tooth; MP, movable finger, proximal tooth; MRLC, movable finger, retrolateral carina; MRVC, movable finger, retroventral longitudinal carina; MSM, movable finger, submedial tooth; RFA, retrofondal apical tooth; RFM, retrofondal medial tooth; RFP, retrofondal proximal tooth; RFSP, retrofondal subproximal tooth.

Figure 11. Xenotrecha huebneri (Kraepelin, 1899), live habitus of adults at Serra do Tepequem, Roraima State, Brazil. A ♂ (CHNUFPI 1247). B ♀ (CHNUFPI 1249).

Figure 12. Xenotrecha huebneri (Kraepelin, 1899), habitus, dorsal aspect (A, B), propeltidium (C, D). A, C ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil. B, D ♀ (CHNUFPI 1248), same locality. Scale bars = 2 mm (A, B), 1 mm (C, D).

Figure 13. Xenotrecha huebneri (Kraepelin, 1899), prosoma, anterolateral propeltidial lobe, lateral aspect (A), anterior part of coxosternal region, ventral aspect (B) [note the severed dextral pedipalp], ctenidia on 2 nd post-genital sternite (C), genital plate, ventral aspect (D). A-C ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil. D ♀ (CHNUFPI 1249), same locality. Scale bars = 0.5 mm (A, D), 1 mm (B), 0.2 mm (C).

Figure 14. Xenotrecha huebneri (Kraepelin, 1899), dextral chelicera, retrolateral aspect (A, C) and close-up of fingers (E), prolateral aspect (B, D) and close-up of flagellum (F). A, B ♀ (CHNUFPI 1248), Serra do Tepequem, Roraima State, Brazil. C-F ♂ (CHNUFPI 1247), same locality. Scale bars = 1 mm (A-D), 0.5 mm (E), 0.2 mm (F). Arrows in C-F indicate the position of hole left by broken FD tooth.

Figure 15. Xenotrecha huebneri (Kraepelin, 1899), sinistral (A) and dextral (B) chelicera, fixed finger, ventral aspect. A ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil. B ♀ (CHNUFPI 1248), same locality. Scale bars = 0.5 mm. Arrow in A indicates hole left by broken FD tooth.

Figure 16. Xenotrecha huebneri (Kraepelin, 1899), ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil, sinistral chelicera, flagellum, prolateral aspect (A) and closeup of the plumose setiform organ (B), stridulatory apparatus, prolateral aspect (C), movable finger, retrolateral aspect (D). Scale bars = 0.2 mm (A), 0.1 mm (B), 0.5 mm (C, D).

Figure 17. Xenotrecha huebneri (Kraepelin, 1899), ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil, sinistral pedipalp, retrolateral aspect (A) and close-up of cleavage plane proximally on femur (B) [indicated by arrow], healed severed stump of dextral pedipalp femur (post-autotomy in nature), retrodorsal (C) and retrolateral (D) aspects. Scale bars = 1 mm (A), 0.5 mm (B-D).

Figure 18. Xenotrecha huebneri (Kraepelin, 1899), ♂ (CHNUFPI 1247), Serra do Tepequem, Roraima State, Brazil, scanning electron micrographs of cleavage plane on healed severed stump (post-autotomy in nature) of dextral pedipalp femur, retrolateral aspect (A) and close-up of edge (B), inclined, anterior aspect (C) and close-up of pointy process on prolateral part of stump (D). Scale bars = 0.5 mm (A, C), 0.1 mm (B), 0.2 mm (D).

Figure 19. Landscape and habitat of Xenotrecha huebneri (Kraepelin, 1899) at Serra do Tepequem, Roraima State, Brazil. Note the dense vegetation (A), grasslands, and rocky outcrops (B - D) present in the area.