taxonID	type	description	language	source
D1A52CD1B52F3BB3A5989462FBA5DA86.taxon	materials_examined	Material examined. Holotype ♂, 10 mm, Nr. 00046, 14 May 2016, Dzonbakal, 20.669819 ° N, 89.778869 ° W, San Antonio Mulix, Uman, Yucatan state, Mexico, collected by D. Angyal, R. Acosta, J. Baduy & S. Reyes in cave part, 26.7 m depth in fresh water; dissected and mounted on slide. Collection ID: CNR 34392 (UNAM, Institute of Biology, National Crustacean Collection, Mexico City.) Allotype ♀, 10 mm, Nr. 00113, 11 June 2016, Cenote Kankirixche, 20.37225 ° N, 89.632892 ° W, Mucuyche, Abala, Yucatan state, Mexico, collected by D. Angyal & E. M. Chavez Solis in cavern part, 20.4 m depth in fresh water; dissected and mounted on slide. Collection ID: HNHM Amphipoda - 4094 (Hungarian Natural History Museum, Collection of Crustaceans, Budapest). Paratypes ♀, 7 mm, Nr. 00056, 14 May 2016, Dzonbakal, 20.669819 ° N, 89.778869 ° W, San Antonio Mulix, Uman, Yucatan state, Mexico, collected by D. Angyal, R. Acosta, J. Baduy & S. Reyes in cave part, 26.3 m depth in fresh water; sputter-coated by gold-palladium. Collection ID: HNHM Amphipoda - 4095 (Hungarian Natural History Museum, Collection of Crustaceans, Budapest). ♂, 8 mm, Nr. 00043, 4 June 2016, Cenote Kanun, 20.745599 ° N, 89.244638 ° W, Homun, Homun, Yucatan state, Mexico, collected by D. Angyal, R. Acosta, J. Baduy, B. Magana & S. Reyes in cave part, 24.3 m depth in fresh water; not dissected. Collection ID: CNR 34393 (UNAM, Institute of Biology, National Crustacean Collection, Mexico City). Juvenile, 3 mm, Nr. 00095, 9 June 2016, Cenote Xaan, 20.727571 ° N, 89.256834 ° W, Homun, Homun, Yucatan state, Mexico, collected by D. Angyal & E. M. Chavez Solis in cave part, 25.4 m depth in fresh water; not dissected. Collection ID: YUC-CC- 255 - 11 - 003922 (UNAM, Academic Multidisciplinary Unit of Teaching and Research, Yucatan Crustacea Collection, Sisal). Juvenile, 5 mm, Nr. 00110, 11 June 2016, Cenote Kankirixche, 20.37225 ° N, 89.632892 ° W, Mucuyche, Abala, Yucatan state, Mexico, collected by D. Angyal & E. M. Chavez Solis in cave part, 33.3 m depth in fresh water; dissected and mounted on slide. Collection ID: HNHM Amphipoda - 4096 (Hungarian Natural History Museum, Collection of Crustaceans, Budapest).	en	Angyal, Dorottya, Solis, Efrain Chavez, Magana, Benjamin, Balazs, Gergely, Simoes, Nuno (2018): Mayaweckeliatroglomorpha, a new subterranean amphipod species from Yucatan state, Mexico (Amphipoda, Hadziidae). ZooKeys 735: 1-25, DOI: http://dx.doi.org/10.3897/zookeys.735.21164, URL: http://dx.doi.org/10.3897/zookeys.735.21164
D1A52CD1B52F3BB3A5989462FBA5DA86.taxon	diagnosis	Diagnosis. Medium-sized, eyeless hadziid with conspicuous troglomorphic traits. The first antenna almost twice as long as body and three times as long as the second antenna; gnathopod I propodus palm armed with distally notched spine teeth, carpus more than 1.5 times as long as corresponding propodus, merus as broad as but shorter than carpus, ventrally produced lobe with three long sensory setae; gnathopod II propodus twice as long as propodus I, palm armed with unnotched spine teeth, carpus slightly shorter than propodus on males. Dactylus, propodus. and carpus of pereopods VI-VII extremely long; therefore, pereopods VI and VII are 1.3 times as long as body length; epimeral plates I-III ventro-posterior corner tiny but distinct, ventral margin without robust setae, posterior margins concave; surfaces of uropods I-III pubescent; telson lobes each possess five-six robust setae and one-three slender setae on outer margin and six-seven robust setae on inner margin. Largest males and females both measured 10 mm.	en	Angyal, Dorottya, Solis, Efrain Chavez, Magana, Benjamin, Balazs, Gergely, Simoes, Nuno (2018): Mayaweckeliatroglomorpha, a new subterranean amphipod species from Yucatan state, Mexico (Amphipoda, Hadziidae). ZooKeys 735: 1-25, DOI: http://dx.doi.org/10.3897/zookeys.735.21164, URL: http://dx.doi.org/10.3897/zookeys.735.21164
D1A52CD1B52F3BB3A5989462FBA5DA86.taxon	description	Description. (10 mm ♂, 8 mm ♂, 8 mm ♀, 7 mm ♀, 5 mm juvenile, 3 mm juvenile.) Antenna 1 (Figures 2, 3) 1.75 times as long as body; three times long as antenna II; primary flagellum with more than 60 articles; aesthetacs were not visible as distal half of the flagellum was missing from each animal (examination of the antennae was possible only using the photos of the living specimens); accessory flagellum with three articles. Antenna II (Figures 2, 3): flagellum with more than 20 articles. Mandibles (Figure 3) subequal; both molar with seta; setal row with four or five serrated setae; palp lacking. Maxilla I (Figure 3): inner plate with approximately 15 apical setae; outer plate with eight apical, pluri-toothed robust setae; second palpal article with five apical robust setae. Maxilla II (Figure 3): inner plate with 15 - 23 obliquely placed setae on inner margin. Maxilliped (Figure 3): inner plate with four or five cone shaped, thick robust setae and several coarse setae apically; outer plate with stiff setae apically. Lower lip (Figure 3): outer lobes narrowly rounded; lateral process prominent; inner lobes rather small. Gnathopod I (Figure 4, 5): dactyl thick, single seta present on anterior margin, inner margin without seta, unguis (nail) length 35 % of total dactylus length. Propodus small, longer than broad; palm short, slightly convex, in palmar corner double row of four-five distally notched spine teeth always present, additional notched spine teeth and spine-like setae sometimes present on palm, close to the base of dactylus; posterior margin of propodus slightly concave, surface near margin covered with pubescent setae; anterior margin with five-seven rows of long, plumose setae (sometimes singly inserted); antero-distal group with six-eight long plumose and simple setae; four singly inserted helical medial setae always present, sometimes additional singly or doubly inserted medial setae present. Carpus narrow, 1.5 - 1.7 times longer than propodus. Merus: as broad as but shorter than carpus, ventrally produced into pubescence, conspicuous lobe with three long sensory setae. Sensory papillae visible on one of the setae. Coxal plate I large, deep, longer than broad, broadly rounded ventrally, margin with three-four robust setae and seven-eight slender setae on females and six robust setae and three-eight slender setae on males. Gnathopod II (Figure 4, 6): dactylus thick, along anterior margin (close to antero-distal corner) a single seta present, inner margin with three-five setae. Propodus twice as long as gnathopod I propodus, narrow, subrectangular; palm length is more than 50 % of propodus length on males and less than 50 % of propodus length on females; palm armed with double row of five-six unnotched spine teeth which are sometimes accompanied by long, pearl row-like setae; surface near margin covered with pubescent setae; helical seta sometimes present below (proximal to) spine teeth; posterior margin with four-five, anterior margin with six-nine sets of plumose setae; three-four medial plumose setae. Carpus slightly shorter than propodus on males and slightly longer than propodus on females, armed with seven-eight rows of comb-like plumose setae on posterior margin. Merus as broad as but more than two times shorter than carpus; not produced ventrally into conspicuous lobe. Coxal plate II kidney-shaped, margin with three-four robust setae and eight slender setae. Coxal plate III (Figure 7) rather small and shallow, margin with two fine setae. Coxal plate IV (Figure 7) more than twice as broad as coxal plate III; posterior margin concave, ventral margin with four short stiff setae; dactylus length 28 % of propodus; single robust seta and one long slender seta at the base of the unguis. Pereopod V (Figure 7) basis 1.7 times longer than broad, margins convex; pereopods VI (Figure 7) and VII (Figure 7) bases twice as long as broad, margins of pereopod VI slightly convex, posterior margin of pereopod VII straight; dactylus of pereopod V 40 % length of corresponding propodus; outer margin with two slender setae; pereopod VI and VII extremely long (especially dactylus, propodus and carpus), 1.3 times as long as body; pereopod VI slightly longer than pereopod VII; pereopod VII dactylus with some short, slender setae at the base of the unguis. Coxal gills (Figure 4) large, almond shaped, pedicellate, present on pereon segments II-VI; oostegites (Figure 4) long, slender. Pleopods (Figs 7, 9) I-III with two-hooked retinaculae. Epimeral plates I-III (Figure 8) ventro-posterior corner tiny but distinct with one slender seta at the corner; ventral margin without robust setae; posterior margin slightly concave on epimeral plate I, concave on epimeral plate II and strongly concave on epimeral plate III. Urosomites (Figure 8): urosomite I with one strong robust seta at the base of uropod I; urosomite II without robust and slender setae; urosomite III with one robust seta mid-dorsally. Uropod I (Figures 8, 9) surface of rami and peduncle covered with pubescent setae; outer ramus 10 - 15 % longer than inner ramus, outer ramus 20 - 33 % shorter than peduncle; peduncle with five-eight spine-like robust setae; outer ramus with four-six robust setae (plus five apical robust setae), inner ramus with five-six robust setae (plus five apical robust setae). Uropod II (Figures 8, 9) surface of rami and peduncle covered with pubescent setae; outer ramus 13 - 22 % longer than inner ramus on the studied males and 25 - 35 % longer than inner ramus on females; outer ramus 5 - 15 % longer than peduncle; peduncle with six spine-like robust setae; inner ramus with three-four robust setae (plus five apical robust setae); outer ramus with four-five robust setae (plus five apical robust setae). Uropod III (Figures 8, 9) surface of rami and distal end of peduncle covered with pubescent setae; uropod III 20 % as long as body; inner ramus slightly longer than outer ramus, margins with long, singly-inserted plumose and pappose setae and some short robust setae, apex with two short spine-like robust setae; outer ramus with long, plumose setae on inner margin and short robust setae on outer margin toward distal end, apex with three robust setae and sometimes additional with long spine-like seta; peduncle with two-four robust setae. Telson (Figure 8) cleft to base, each half 2.65 times longer than broad; lobes each with five-six robust setae and one-three slender setae on outer margin and six-seven robust setae on inner margin.	en	Angyal, Dorottya, Solis, Efrain Chavez, Magana, Benjamin, Balazs, Gergely, Simoes, Nuno (2018): Mayaweckeliatroglomorpha, a new subterranean amphipod species from Yucatan state, Mexico (Amphipoda, Hadziidae). ZooKeys 735: 1-25, DOI: http://dx.doi.org/10.3897/zookeys.735.21164, URL: http://dx.doi.org/10.3897/zookeys.735.21164
D1A52CD1B52F3BB3A5989462FBA5DA86.taxon	etymology	Etymology. The name troglomorpha refers to the highly adaptive troglomorphic features of the new species, particularly the elongation of appendages, the increased number of sensory setae and papillae, and general appearance of fragility. Gender feminine.	en	Angyal, Dorottya, Solis, Efrain Chavez, Magana, Benjamin, Balazs, Gergely, Simoes, Nuno (2018): Mayaweckeliatroglomorpha, a new subterranean amphipod species from Yucatan state, Mexico (Amphipoda, Hadziidae). ZooKeys 735: 1-25, DOI: http://dx.doi.org/10.3897/zookeys.735.21164, URL: http://dx.doi.org/10.3897/zookeys.735.21164
D1A52CD1B52F3BB3A5989462FBA5DA86.taxon	distribution	Distribution and remarks on ecology. The new species is known from four cenotes in the state of Yucatan, covering a distribution distance of 52 km (distance between the farthest cenotes Dzonbakal and Xaan). All the individuals were found in fresh water habitat, in most cases far from the cenote entrances, deeper in the associated cave passages, where sunlight does not penetrate. Water temperature was between 26 and 27 ° C. Specimens were collected between 20 and 33 meters depth; in cenote Kankirixche some individuals were observed below 45 meters depth. The new species was represented in all four localities with low abundance, though it proved to be more common and more abundant than M. cenoticola, of which a single specimen was found in only one (Ayun-Nah) of the 14 visited cenotes, during an underwater waste collecting activity, hidden in a plastic soft drink bottle. In the type locality and in cenotes Xaan and Kankirixche the new species co-occurred with the hadziid amphipod Tuluweckelia cernua. Other co-occurring stygobiont macro-crustaceans (in the four cenotes) were the mysid Antromysis cenotensis Creaser, 1936, the stygiomysid Stygiomysis cf. holthuisi (Gordon, 1958), the isopods Creaseriella anops (Creaser, 1936) and Yucatalana robustispina Botosaneanu & Iliffe, 1999, and the decapods Typhlatya mitchelli Hobbs & Hobbs, 1976, Typhlatya pearsei Creaser, 1936, and Creaseria morleyi (Creaser, 1936).	en	Angyal, Dorottya, Solis, Efrain Chavez, Magana, Benjamin, Balazs, Gergely, Simoes, Nuno (2018): Mayaweckeliatroglomorpha, a new subterranean amphipod species from Yucatan state, Mexico (Amphipoda, Hadziidae). ZooKeys 735: 1-25, DOI: http://dx.doi.org/10.3897/zookeys.735.21164, URL: http://dx.doi.org/10.3897/zookeys.735.21164
