Mayazomus hoffmannae ( Reddell and Cokendolpher, 1986 )

Monjaraz-Ruedas, Rodrigo & Francke, Oscar F., 2015, Taxonomic revision of the genus Mayazomus Reddell & Cokendolpher, 1995 (Schizomida: Hubbardiidae), with description of five new species from Chiapas, Mexico, Zootaxa 3915 (4), pp. 451-490 : 461-464

Mayazomus hoffmannae ( Reddell and Cokendolpher, 1986)

Figs. 24−37 , 112 , Table 2

Schizomus hoffmannae Reddell and Cokendolpher, 1986: 31 , 34, 35, 37, figs. 6–10; Reddell and Cokendolpher, 1991: 18. Mayazomus hoffmannae ( Reddell and Cokendolpher): Reddell and Cokendolpher, 1995 : 82.

Sotanostenochrus hoffmannae (Reddell and Cokendolpher) : Vázquez Rojas, 1995: 34; Vázquez Rojas, 1996: 65.

Type material. MEXICO: Tabasco: Male (heteromorphic) holotype (CNAN-T0121, examined) [13 February 1982, R. Murillo] from Tapijulapa [17.4641ºN, 92.7690ºW, 40 m. a.s.l.], Municipio Tacotalpa.

Additional material examined. MEXICO: Tabasco: 1 heteromorphic male and 1 female (CNAN-Sz000123) [1 August 2013, O. Francke, J. Mendoza, R. Monjaraz, C. Santibáñez A. Valdez, K. Zarate,] from Tapijulapa, sendero a las Grutas de Villa Luz (17.44540ºN, 92.7615ºW, 55 m. a.s.l.), Municipio Tacotalpa. 1 female (CNAN- Sz000124) [1 August 2013, O. Francke, J. Mendoza, R. Monjaraz, C. Santibáñez A. Valdez, K. Zarate,] from outside Grutas del Coconá (17.56357ºN, 92.9289ºW, 27 m. a.s.l.), Municipio Teapa.

Emended diagnosis. Males can be distinguished by the pedipalp trochanter having a trapezoidal apical process ( Fig. 6 , 36, 37 ); femur with spiniform setiferous tubercles Fv1 and Fv2 with a straight margin between them, by the presence of a small apophysis (FAP) on distal margin on mesal surface with a spiniform setae ending in a rounded tip; the pedipalp tibia with a small mesal apophysis (TMA) with a rounded tip, placed anteriorly ( Fig. 36, 37 ); by the presence of a very pronounced distal depression on the dorsal surface of the flagellum ( Figs. 30–32 ). Females can be distinguished by the spermathecae having median lobes longer than laterals (about three times length of lateral lobes) and curved, J- shaped ( Figs. 29 ). Mayazomus hoffmanae resembles Mayazomus kaamuul n. sp., in the general shape of the pedipalps, sharing the blunt tip of the femoral apophysis and the trapezoidal shape of the apical process of the trochanter. The flagellum is cordate in both species but differs in the dorsal relief, M. hoffmannae presents a posterior depression fused distally whereas M. kaamuul presents a pair of dorso-submedian circular swellings. The spermathecae are very similar but differ in the width of the lobes, which have the same width in M. hoffmannae whereas in M. kaamuul the lateral lobes are wider than the median lobes. Additionally M. kaamuul presents a long and widened gonopod, whereas in M. hoffmannae it is weakly marked, shorter and slender.

Supplementary description. The following description and meristic data for the holotype and paratypes supplements the original description by Reddell & Cokendolpher (1986).

Heteromorphic Male (holotype): Propeltidium, legs, pedipalps and flagellum dark brownish, opisthosoma darker. Prosoma: Propeltidium with two setae on anterior process and two pairs of dorsal setae; ocular spots ovoid shape. Mesopeltidial plates 0.26 wide, 0.08 long; gap between the plates 0.24. Metapeltidium 0.32 long, 0.70 wide. Anterior sternum with 12 setae, plus two sternopophysial setae; posterior sternum with six setae.

Chelicerae ( Figs. 26–28 ): Movable finger: Serrula with 21 teeth. Fixed finger with 4 smaller teeth between 2 primary teeth. Setation: Setal group formula: 1:3, 2:6, 3:4, 4:2, 5:8, 6:1. G1 (setae group 1) with three spatulate setae, covered with spiniform spicules starting near middle of the shaft ( Fig 28 ); G2 composed of six feathered setae, subequal in length, and shorter than movable finger length; G3 with four setae, two long and two shorter, about 1/3 of long setae, feathered apically and smooth basally; G4 consisting of two setae, smooth, short and thick, spine-like; G5 with eight similar sized setae, feathered apically and longer than fixed finger; G6 with one smooth setae and about 1/2 of movable finger length.

Pedipalps ( Figs. 6 , 36, 37 ): Robust; 3.61 times longer than propeltidium length. Trochanter long, 2.59 times longer than high; apical process enlongated, trapezoidal shaped; with a row of many long setae on ventral margin; mesal surface with a row of three setae near ventral margin, plus two setae near dorsal margin; with a small, median mesal spur. Femur wide, 1.81 times longer than high, elongated distally; distal margin straight, ventral margin flattened; distal margin on ectal surface with spiniform setiferous tubercles Fv1 and Fv2 small and near each other, located ventrally ( Fig. 36 ); mesal surface with two ventral plus two dorsal spiniform setae (2+2); distal margin of mesal surface with a blunt apophysis (FAP) ( Fig. 37 ). Patella strongly curved, inverse U- shaped; with scattered setae and with two ventral rows of three setae each. Tibia expanded distally, with scattered setae; with a welldeveloped apophysis on meso ventral surface opposable to tarsus (MS). Tarsus elongated, 2.63 times longer than high. Claw about 1/3 as long as dorsal length of tarsus; spurs asymmetrical, 0.06 long.

Legs: Leg I, basitarsal-telotarsal proportions: 18: 3: 3: 4: 4: 5: 10. Femur IV 2.3 times longer than deep.

Opisthosoma: Tergite I with two pairs microsetae anteriorly plus one pair macrosetae 2+1; tergite II with three pair microsetae anteriorly and five macrosetae 3+5 two on the right and three on the left side; tergites III–VII with one pair dorsal setae each; tergites VIII–IX with one pair dorsal and one pair lateral setae; segments X–XI telescoped with one pair lateral setae and five ventral setae; segment XII with one dorsal, two lateral and four ventral pairs of setae, without posterodorsal process. Sternites with scattered setae; genital aperture with a row of microsetae.

Flagellum ( Figs. 30–32 ): dorsoventrally flattened, cordate in shape; 1.80 times longer than wide, 2.57 times longer than pedicel length; with a dorsoposterior depression, fused and narrowed distally. Setation: Dm1 situated over bulb base; Dm4 situated distally; Dl1 not reduced, 2/3 of Vl1 seta; Dl1 positioned at the same level as Vl1; Dl3 posterior to Vl2; pair Vm2 present; seta Vm1 posterior to Vm2; Vm5 posterior to Vl1. With one pair of antero-dorsal microsetae between Dm1 and Dl1 nearest to Dl1; one pair of antero-lateral microsetae on flagellar pedicel, and one pair of irregular clumps between Vl1 and Vl2, each composed of 5 microsetae.

Female: Similar to the male, except in pedipalp development, 2.16 times longer than propeltidium length, female pedipalps are robust but do not have armature or any modification on the segments. Apical process of the trochanter shorter and smaller. Other differences: Propeltidium shorter than male ( Table 1 ), general setation as on male. Flagellum ( Figs. 33–35 ): with three annuli. Setation: seta Dl1 reduced and at same level as Vl1; Dl3 posterior to Vl2; Vm2 present and reduced; seta Vm1 at same level as Vm2. Segment III with one lateral pair of microsetae near to Vm4. Segment IV with one pair of distolateral microsetae near to Dl3. Spermathecae ( Fig. 29 ): with 4 lobes; median pair long and curved, J-shaped; lateral pair straight, very small, and thick; both with duct openings. Gonopod short, wide; chitinized arch U- shaped, posterior branch wide at the base, with irregular margins, lateral tip not sclerotized.

Variation. Homeomorphic male unknown. Female propeltidium length 1.15 – 1.25 (n=2). Without cheliceral variation.

Distribution. This species is distributed in the south of Tabasco in the municipalities of Teapa and Tacotalpa, in a few well-conserved areas ( Fig. 112 ).

Natural history. The specimens were collected in conserved areas, in the surroundings of the Cocona cave and the Villa Luz cave under big rocks. Another schizomid, Pacal trilobatus Rowland, 1975 , was collected in sympatry.

Figures

FIGURE 112. Distribution map of the known species of the genus Mayazomus, showing the type localities of the five new species: M. tzotzil, M. aluxe, M. kaamuul, M. yaax and M. loobil

FIGURES 24, 25. Mayazomus hoffmannae. Male holotype. Habitus: 24. Dorsal view. Female. Habitus: 25. Dorsal view. Scale bar = 2 mm.

FIGURES 26 – 29. Mayazomus hoffmannae. Male. Chelicera (26 – 28): 26, mesal view. 27, fixed finger. 28, movable finger. Female. Spermathecae: 29, dorsal view. Scale bar (Fig. 29) = 0.05 mm.

FIGURES 30 – 37. Mayazomus hoffmannae. Male holotype. Flagellum (30 – 32): 30, dorsal view. 31, ventral view. 32, lateral view. Female. Flagellum (33 – 35): 33, dorsal view. 34, ventral view. 35, lateral view. Heteromorphic male. Pedipalp (36, 37): 36, ectal view. 37. mesal view. Scale bars = 0.2 mm.

FIGURES 1 – 7. Nomenclature diagrams. 1 – 5, 7: Mayazomus infernalis, 1 – 3, female flagellum: 1, dorsal view, 2, ventral view, 3 lateral view; 4, 5, heteromorphic male pedipalp: 4, ectal view, 5, mesal view; 7, 6, pedipalp trochanter apical process, ectal view. 6: Mayazomus hoffmannae, pedipalp trochanter apical process. Abreviations: Dm = dorsal medial, Dl = dorsal lateral, Vm = ventral medial, Vl = ventral lateral, Fv = femur ventral, Fe = femur ectal, TMA = tibial mesal apophysis, FAP = femoral apophysis, AP = apical process. Scale bars Fig. 1 – 3 = 0.2 mm, Fig. 4 – 7 = 0.5 mm.