Eutrecha belenensis, Botero-Trujillo & Martínez & Iuri & Ojanguren-Affilastro & Carvalho, 2023

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

publication ID	https://dx.doi.org/10.3897/asp.81.e95181
publication LSID	lsid:zoobank.org:pub:BE57FF40-7147-40AC-8BEA-1706A95DA4ED
persistent identifier	https://treatment.plazi.org/id/47E7B90D-ECCB-4855-951F-729291FC3483
taxon LSID	lsid:zoobank.org:act:47E7B90D-ECCB-4855-951F-729291FC3483
treatment provided by	Arthropod Systematics & Phylogeny by Pensoft
scientific name	Eutrecha belenensis
status	sp. nov.

Treatment

3.1.3. Eutrecha belenensis sp. nov.

Figs 1 View Figure 1 , 2C View Figure 2 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6

Material examined.

Holotype. COLOMBIA • 1 ♂; Norte de Santander, Playa de Belén, Área protegida Los Estoraques , Centro Administrativo ; 08°13′15.3″N 73°14′18.25″W; 1400 m.a.s.l.; 17 Dec. 2015; E. Henao leg.; ICN Aso 008. GoogleMaps

Etymology.

Latinized gentilicium that identifies this species as an inhabitant of Playa de Belén.

Diagnosis.

The male of Eutrecha belenensis features a series of morphological characteristics, each unique to this species among known species of Eutrecha , which allow to readily separate it from its congeners and provides a robust delimitation of the species on morphological grounds. These are: i) Cheliceral fixed finger with FM and FD teeth reduced in size (e.g., smaller than MSM, which is of normal size for a secondary tooth), yet both teeth evident (Figs 2C View Figure 2 , 5B View Figure 5 , 6 View Figure 6 ). ii) Ventral margin of fixed finger asetose area (i.e., where distal teeth are situated) predominantly linear in lateral aspect (Figs 2C View Figure 2 , 5B View Figure 5 ). iii) Movable finger of male moderately robust (e.g., relative to height of MP tooth) (Figs 2C View Figure 2 , 5D View Figure 5 ). iv) MM tooth moderately smaller than MP, larger than MSM (Figs 2C View Figure 2 , 5B, D View Figure 5 , 6B View Figure 6 ). v) MM tooth adjacent to MSM (Figs 2C View Figure 2 , 5B, D View Figure 5 ). vi) Fixed finger mucron length more than twice height at its base; movable finger mucron length at least three times height at its base (Figs 2C View Figure 2 , 5B, D View Figure 5 ). vii) Stridulatory apparatus consisting of a single set of ridges, all subparallel to the manus ventral surface (Fig. 5C, D View Figure 5 ). viii) Flagellum narrowing distally in prolateral aspect, apex entire (non-bifid) (Figs 5C, D View Figure 5 , 6 View Figure 6 ). ix) Attachment point of the flagellum subcircular (Fig. 5D View Figure 5 ). x) Pedipalp tibia and basitarsus with ventral rows of about seven to nine spiniform setae each (Fig. 4B, C View Figure 4 ). xi) Basitarsi of walking legs II and III, each with three proventral and two retrolateral spiniform setae (in addition to others on retroventral and retrodorsal series). xii) Basitarsus of leg IV with two distal retroventral spiniform setae (in addition to others on proventral series). xiii) Opisthosoma of male, ctenidia arranged into a single large area on 1st post-genital sternite (spiracular sternite I) (Fig. 4D View Figure 4 ).

Description of male.

Based on holotype (ICN Aso 008). - Measurements. Linear measurements in Table 1 View Table 1 . - Color. In 80% ethanol-preserved specimen. Prosomal dorsal shields and opisthosomal tergites with overall brown coloration (Fig. 4A View Figure 4 ). Propeltidium with abundant dark brown areas, several paler spots distributed unevenly, and a median longitudinal pale brown line; ocular tubercle blackish. Meso-, metapeltidium, and opisthosomal tergites predominantly light brown, with small dark spots. Chelicerae, base color pale brown (same as pale propeltidial areas) (Fig. 5A, B View Figure 5 ), with three dark brown longitudinal stripes on prodorsal, dorsal, and retrolateral surfaces of manus, which are interconnected distally by a broad, transverse stripe and posteriorly by a narrow, weakly defined stripe; stridulatory plate immaculately yellow (Fig. 5C, D View Figure 5 ), with a proventral proximal brown spot. Asetose area of fixed and movable fingers reddish, with all teeth darkened (Fig. 5B, D View Figure 5 ); movable finger setose area with ventral, brown-spotted area. Coxosternal region, opisthosomal sternites (Fig. 4D View Figure 4 ), pleural membranes, trochanters of legs and pedipalps (Fig. 4A View Figure 4 ), basifemora and telofemora of legs II-IV, and femur of leg I immaculately yellowish white; malleoli white. Pedipalp femur, tibia, and basitarsus dark brown (Fig. 4A, B View Figure 4 ), with faint paler areas; telotarsus yellowish (Fig. 4B, C View Figure 4 ). Legs with patella, tibia, basitarsus, and telotarsus brownish (Fig. 4A View Figure 4 ), with coloration pattern similar to that of pedipalps but paler. - Prosoma. Propeltidium wider than long (Table 1 View Table 1 ); central region covered with short, spicule-like stout setae which become longer towards the outer borders (Fig. 4A View Figure 4 ); the longer of these setae fall off and break easily, unlike the shorter ones; all setae seem to be apically worn. Ocular tubercle slightly elevated, with abundant macrosetae. Anterolateral propeltidial lobes separated from the propeltidium principal shield by incomplete lateral groove. Eyespots elongated. Meso- and metapeltidium wider than long, with abundant long macrosetae (Fig. 4A View Figure 4 ). Coxae densely covered with abundant thin setae. Sternum glabrous. - Chelicera-dentition and processes. Fixed finger with median teeth series comprising well-developed FP tooth, whereas other primary teeth (FM and FD), as well as the FSM tooth, are small (Figs 2C View Figure 2 , 5B View Figure 5 , 6 View Figure 6 ); FSD tooth absent; FM and FD teeth, each importantly displaced distally in the finger relative to the contiguous, more proximal tooth (FSM and FM, respectively), such that a medial notch (MN) and a median apical diastema (FMAD) are present; retrofondal teeth series uninterrupted (i.e., without FRFD), with four teeth (RFSP, RFP, RFM, RFA) (Fig. 6 View Figure 6 ); basal retrofondal margin heavily sclerotized (Fig. 6A View Figure 6 ); profondal teeth series consisting of four teeth (PFSP, PFP, PFSM, PFM) (Fig. 6B View Figure 6 ). Fixed finger asetose area sinuous, with ventral margin predominantly linear in lateral aspect; prodorsal carina sharp, not elevated in lateral aspect, without angular dorsal crest; proventral carina weakly pronounced on the mucron area; fixed finger retrolateral carina (FRLC) absent. Fixed finger mucron without subterminal (FST) teeth; apex (FT tooth) curved, hook shaped. Movable finger with median teeth series comprising well-developed MP and MM primary teeth, the former of which is larger, and one MSM secondary tooth that is smaller than MM (i.e., MP> MM> MSM) (Figs 2C View Figure 2 , 5B View Figure 5 ); MP, MSM, and MM close together; MP and MM each adjacent to MSM; MSM upright and triangular. Movable finger prolateral carina (MPLC) evident, ending slightly basal to MP in a small prolateral (MPL) tooth (Fig. 6B View Figure 6 ). Movable finger without subproximal (MSP) or subterminal (MST) teeth; movable finger retroventral longitudinal carina (MRVC) present on distal half, or third, of finger, forming a smooth elevated ridge (Figs 2C View Figure 2 , 5B View Figure 5 ); retrolateral longitudinal carina (MRLC) consisting of abundant conspicuous granules scattered on the retrolateral surface of finger. Movable finger mucron moderately long, with gnathal edge carina ordinary (not convex). Closure of RFA tooth basal to MP, of MM tooth distal to FM, when fingers are closed. - Chelicera-setose areas and stridulatory plate. Retrolateral and dorsal surfaces with abundant retrolateral manus (rlm) and retrolateral finger (rlf) setae, of different sizes, which are predominantly straight and rigid (Figs 4A View Figure 4 , 5 View Figure 5 ); some of these setae are arranged in bilaterally symmetrical pattern, as are some principal retrolateral finger (principal rlf) setae that are more flexible than others; movable finger retrolateral proximal setal cluster (rlpc) dorsally with a single, long and markedly plumose seta. Prolateral surface with array of setal types (Fig. 5D View Figure 5 ), as follows: proventral distal (pvd) setae consisting of row of plumose setae, starting at level of the interdigital condyle (pic) and ending near level of RFA tooth; proventral subdistal (pvsd) setae arranged in rather disorganized pattern, pvsd comb not markedly differentiated; carpet-like field of bristle-like promedial (pm) setae broad. Stridulatory plate longer than high, occupying most of the prolateral surface of manus (Fig. 5C, D View Figure 5 ); stridulatory apparatus consisting of a single set of ridges, 6 or 7 in number, dorsalmost vestigial, all approximately parallel to the manus ventral surface. Distal limit of the prolateral setose area of movable finger reaching midpoint between MSM and MM teeth; movable finger prodorsal (mpd) setal series consisting of plumose setae arranged in a rather staggered row, adjacent to abundant non-plumose setae of the movable finger promedial (mpm) and proventral (mpv) setal series. - Chelicera-flagellum. Of the composite type, without shaft. A thin, translucent, membranous structure immovably attached prodorsally to the fixed finger (Figs 5D View Figure 5 , 6 View Figure 6 ); flagellar base general aspect bowl-shaped, long, and narrowing distally in prolateral aspect, nearly reaching the apex of the finger on its distal end; apex entire (non-bifid), bearing small spicules; attachment point subcircular, placed at the level of PFSM tooth. - Pedipalp. All segments coated with abundant short setae (Fig. 4A-C View Figure 4 ); those on ventral surface of tibia, basitarsus, and telotarsus stouter and more distinct than those on other surfaces. Femur with spicule-like macrosetae; tibia with proventral and retroventral rows of eight spiniform setae each, which are short and stout; basitarsus with proventral and retroventral rows of seven to nine spiniform setae each (Fig. 4B, C View Figure 4 ), stronger and longer than those on tibia; telotarsus without spiniform setae. Femur, tibia, basitarsus, and telotarsus with few long thin setae; clubbed setae apparently absent. Retroventral surface of femur proximally with a suture-like cleavage plane. Telotarsus with retrodorsal pore area on distal third. - Leg I. All segments coated with abundant short setae similar to those on pedipalps (Fig. 4A View Figure 4 ), without stout or spiniform setae; tibia and basitarsus with few long thin setae. Telotarsus with apical retrodorsal pore area similar to that of pedipalp; without claws or spiniform setae. - Walking legs. Covered with abundant short and a few long setae, like those on pedipalps and legs I (Fig. 4A View Figure 4 ). Legs II and III: basitarsus with seven or eight spiniform setae: three proventral (distal, subdistal, and sub-basal), one or rarely two retroventral (distal), two retrolateral (subdistal and basal), and one retrodorsal (distal); telotarsus bi-segmented (consisting of large basal and small distal segments), with proventral row of four to six spiniform setae (along basal and distal segments) and a retroventral row of three or four (along basal segment only), in 2.2.2/1, 2.2.2/1.1, or 2.2.2.2/1.1 pattern; in addition, the basal segment of sinistral leg II telotarsus bears two extra spiniform setae adjacent to the retrolateral series (not aligned with the row but in more submedial position). Leg IV: basitarsus with row of three/four proventral and two distal retroventral spiniform setae; telotarsus 3-segmented (the two segmentation lines are complete), with proventral and retroventral rows of four spiniform setae each (along basal and median segments only), in 2.2.2/2/0 pattern. - Opisthosoma. Tergites with abundant setae similar to those on propeltidium (Fig. 4A View Figure 4 ); setation of the sternites comparable to that of coxae. Ctenidia present on 1st post-genital sternite (spiracular sternite I) (Fig. 4D View Figure 4 ); ctenidia in the form of abundant, short “fleshy” setae, densely arranged into what looks like a single large area on the sternite; other sternites without ctenidia.