Eutrecha belenensis Botero-Trujillo, Martínez, Iuri, Ojanguren-Affilastro & Carvalho, 2023
- Dataset
- GBIF Backbone Taxonomy
- Rank
- SPECIES
- Published in
- 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: 317-344, DOI: http://dx.doi.org/10.3897/asp.81.e95181, URL: http://dx.doi.org/10.3897/asp.81.e95181
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Arachnida
- order
- Solifugae
- family
- Ammotrechidae
- genus
- Eutrecha
- species
- Eutrecha belenensis
description
Description of male. Based on holotype (ICN Aso 008). - Measurements. Linear measurements in Table 1. - Color. In 80 % ethanol-preserved specimen. Prosomal dorsal shields and opisthosomal tergites with overall brown coloration (Fig. 4 A). 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. 5 A, B), 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. 5 C, D), with a proventral proximal brown spot. Asetose area of fixed and movable fingers reddish, with all teeth darkened (Fig. 5 B, D); movable finger setose area with ventral, brown-spotted area. Coxosternal region, opisthosomal sternites (Fig. 4 D), pleural membranes, trochanters of legs and pedipalps (Fig. 4 A), 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. 4 A, B), with faint paler areas; telotarsus yellowish (Fig. 4 B, C). Legs with patella, tibia, basitarsus, and telotarsus brownish (Fig. 4 A), with coloration pattern similar to that of pedipalps but paler. - Prosoma. Propeltidium wider than long (Table 1); central region covered with short, spicule-like stout setae which become longer towards the outer borders (Fig. 4 A); 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. 4 A). 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 2 C, 5 B, 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); basal retrofondal margin heavily sclerotized (Fig. 6 A); profondal teeth series consisting of four teeth (PFSP, PFP, PFSM, PFM) (Fig. 6 B). 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 2 C, 5 B); 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. 6 B). 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 2 C, 5 B); 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 4 A, 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. 5 D), 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. 5 C, D); 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 5 D, 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. 4 A-C); 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. 4 B, C), 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. 4 A), 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. 4 A). 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. 4 A); setation of the sternites comparable to that of coxae. Ctenidia present on 1 st post-genital sternite (spiracular sternite I) (Fig. 4 D); 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.
description
Figs 1, 2 C, 4, 5, 6
diagnosis
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 2 C, 5 B, 6). ii) Ventral margin of fixed finger asetose area (i. e., where distal teeth are situated) predominantly linear in lateral aspect (Figs 2 C, 5 B). iii) Movable finger of male moderately robust (e. g., relative to height of MP tooth) (Figs 2 C, 5 D). iv) MM tooth moderately smaller than MP, larger than MSM (Figs 2 C, 5 B, D, 6 B). v) MM tooth adjacent to MSM (Figs 2 C, 5 B, D). 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 2 C, 5 B, D). vii) Stridulatory apparatus consisting of a single set of ridges, all subparallel to the manus ventral surface (Fig. 5 C, D). viii) Flagellum narrowing distally in prolateral aspect, apex entire (non-bifid) (Figs 5 C, D, 6). ix) Attachment point of the flagellum subcircular (Fig. 5 D). x) Pedipalp tibia and basitarsus with ventral rows of about seven to nine spiniform setae each (Fig. 4 B, C). 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 1 st post-genital sternite (spiracular sternite I) (Fig. 4 D).
distribution
Distribution. Eutrecha belenensis is known only from the type locality in the department of Norte de Santander, Colombia (Fig. 1).
etymology
Etymology. Latinized gentilicium that identifies this species as an inhabitant of Playa de Belen.
materials_examined
Material examined. Holotype. COLOMBIA • 1 ♂; Norte de Santander, Playa de Belen, Area 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.