Guelaguetzia serrana, Cruz-López & Francke, 2020

Cruz-López, Jesús A. & Francke, Oscar F., 2020, Two new genera of epigean harvestmen (Opiliones, Stygnopsidae) from Oaxaca, Mexico, with an identification key for the stygnopsine genera, Zootaxa 4748 (3), pp. 431-454 : 445-448

Guelaguetzia serrana sp. nov.

urn:lsid:zoobank.org:act:47D7349A-76FF-498F-B4FF-BE4FDBA5EA7A

( Figs. 37–54 , 56 )

Type material. Holotype male ( CNAN-T01334 ), outside of Murciélago cave , Nuevo Zoquiápam, 17º17’21.9’’N, 96º37’14.0’’W, Oaxaca State, Mexico, 20.viii.2013, J. Sánchez, A. Hernández, S. Caballero, E. López, R. Méndez, J. Cisneros leg. Two male, five female and four immature paratypes ( CNAN-T01335 ), same data as the holotype.

Etymology. The Spanish word ‘serrana’ means inhabitants of the region of the Northern Sierra in Oaxaca; the name is treated as adjective in feminine.

Distribution. Only known from the type locality ( Fig. 57 ).

Diagnosis. Guelaguetzia serrana sp. nov. can be recognized from G. cuicateca sp. nov. by the following combination of characters: fixed finger of chelicerae without a basal notch ( Fig. 42 ), pedipalpal femur with four small spiniform setiferous tubercles ( Fig. 44 ), retrolateral apophysis of coxa IX cylindrical ( Fig. 41 ), dorso-ectal apophysis on trochanter IV much larger than the central one ( Fig. 48 ), ventro-distal apophysis on trochanter IV strong and slightly curved ( Fig. 49 ), with one ventral apophysis on patella IV ( Fig. 50 ), the three distal-most tubercles of the ventro-prolateral row on femur IV as large as those on the retrolateral row ( Figs. 46, 50 ), and apical margin of flimsy lamina rounded ( Fig. 54 ).

Description. Measurements of the holotype, scutum length: 4.3, scutum width at level of the mid-bulge: 3.4, RSC: 1.1, RHW: 2.2.

Dorsum ( Figs. 37, 39 , 40 ): Scutum type zeta (ζ) with the mid-bulge rounded, coda I deep and marked, and coda II soft. Mesotergal areas with a few central small tubercles only, more prominent on areas II, III and IV; lateral margins of scutum with a continuous row of lateral pegs; posterior to the ocularium there are two rows of a few tubercles forming a “V”. Ocularium broad, rounded and densely covered by small tubercles. Prosoma with a low hump posterior to ocularium. Free tergites with a transverse row of spiniform tubercles.

Venter ( Fig. 41 ): Venter covered by a few spiniform tubercles, larger and forming a transversal row on coxae I and II. Coxa III slightly larger than coxa II. Coxa IV is the largest, occupying the largest area in ventral view, quadrangular shaped, projected beyond the scutum margins, with the lateral sides with many spiniform tubercles. Stigmatic area short and very compressed in the middle. Free sternites with a transverse row of spiniform tubercles, anal plate covered with small tubercles.

Chelicerae ( Figs. 42, 43 ): Basichelicerite with a long bulla, with a few tubercles dorsally. Cheliceral hand very swollen, rounded, articulated with the basichelicerite near the middle portion. Cheliceral dentition heterogeneous, basal tooth of the movable finger blunt and displaced from the base of the finger, followed by four small and contiguous teeth apically; fixed finger without a basal notch, followed distally by four very wide teeth, the basal-most is the largest and bifid.

Pedipalps ( Figs. 44, 45 ): Trochanter rounded, without any spiniform apophysis dorsally or ventrally, covered only by a few tubercles. Femur slightly compressed laterally and softly curved, dorsally covered with a few scattered tubercles, ventrally with a row of four inconspicuous setiferous tubercles. Patella unarmed, only with few spiniform tubercles dorsally. Tibia rectangular in cross section, with three (III, 1=2=3) and three (iIi, 2> 1> 3) major setiferous tubercles on both margins, respectively T1–T3, on ectal margin confined to the apical portion, T2 and T3 almost fused at their bases; on the mesal margin the basal-most is in the middle, T2 and T3 are placed apically and almost fused at their bases. Both margins of tarsus with four major setiferous tubercles decreasing in size distally. Tarsal claw shorter than tarsus.

Legs ( Figs. 46–51 ): Measurements in Table 2 . Legs I and II slender, without armature and covered only by small tubercles. Trochanter III not globose, barely larger than trochanter II. Trochanter IV slightly globose, with two dorsal spiniform apophyses, the ectal very large; ventrally with three strong mesodistal apophyses, increasing in size distally and gradually curved from the basal-most to the apical-most, the last very strong. Femur IV thickened, curved and ornate with longitudinal rows of tubercles, with the two ventral rows more prominent, the retrolateral row formed by six very large spiniform tubercles, followed distally by a gap without tubercles and ending in an apical spine; prolateral row formed by many small tubercles similar in size, followed distally by three large spiniform tubercles and ending in a apical spine. Patella with apical apophyses on retro- and prolateral faces, and with one ventral spiniform apophysis. Tibia slightly curved in the middle, slightly swollen distally, covered by longitudinal rows of spiniform tubercles, the two ventral rows slightly larger, both ending in an apical spine. Tarsal count: 5(2):11(3):6:6.

Male genitalia ( Figs. 52–54 , 56 ): Pars distalis compressed laterally, subrectangular in lateral view, with the flimsy lamina contiguous, undifferentiated and large, with the apical margin rounded. Follis emerging from the apical cavity between the base of flimsy lamina and pars distalis, hidden and with two rounded lobes covering the stylus. With a remnant pair of macrosetae D, just basal to the edge of pars distalis in front of follis; with two pairs of filiform macrosetae C at the base of flimsy lamina; a pair of filiform macrosetae B in the middle of pars distalis, completely displaced to the ventral face; two pairs of filiform macrosetae A on the dorso-basal portion of pars distalis; a pair of remnant sockets of macrosetae E on flimsly lamina, just distal to macrosetae C.

Female. Sexual dimorphism very noticeable with body and chelicera smaller, and leg IV with the femora thinner and armature less developed ( Figs. 38 , 51 ), RSC=1.4, (n=5). Leg measurements in Table 2 .

Figures

FIGURE 57. Distribution map of Ampliphallus chimalapaensis gen. nov., sp. nov. (white circle) and two species of Guelaguetzia gen.nov.: G. cuicateca sp. nov. (black square) and G. serrana sp. nov. (white square).

FIGURES 37–39. Guelaguetzia serrana sp. nov., holotype male (CNAN-T01334) and paratype female (CNAN-T01335). 37, habitus holotype, dorsal view. 38, habitus female, dorsal view. 39, lateral view holotype. Scale bars: 1 mm.

FIGURES 40, 41. Guelaguetzia serrana sp. nov., holotype male (CNAN-T01334). 40, scutum. 41, venter. Scale bars: 1 mm.

FIGURES 42–45. Guelaguetzia serrana sp. nov., holotype male (CNAN-T01334). 42, chelicera, frontal view. 43, chelicera, mesal view. 44, pedipalp, mesal view. 45, pedipalpal tibia and tarsus, ventral view (major spiniform setiferous tubercles on tibia indicated as T1–T3). Scale bars: 1 mm.

FIGURES 46–51. Guelaguetzia serrana sp. nov., 46–50: holotype male (CNAN-T01334). 46, leg IV, ectal view. 47, leg IV, mesal view. 48, trochanter IV, dorsal view. 49, trochanter IV, ventral view. 50, femur IV, ventral view. 51, paratype female (CNAN-T01335), femur IV ventral view. Scale bars: 1 mm.

FIGURES 52–54. Guelaguetzia serrana sp. nov., penis of holotype male (CNAN-T01334). 52, dorsal. 53, lateral. 54, ventral. Macrosetae groups: yellow=A, blue=B, pink=C, green=D, white arrows=remnant sockets of macrosetae E. Scale bars: 100 µm.

FIGURES 55–56. Guelaguetzia cuicateca sp. nov. and Guelaguetzia serrana sp. nov., details of macrosetae D. 55, penis of G. cuicateca sp. nov. (CNAN-T01330). 56, penis of G. serrana sp. nov. (CNAN-T01334). White arrows indicate remnant macrosetae D. Scale bars: 25 µm.