Guelaguetzia cuicateca, 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 : 440-444

Guelaguetzia cuicateca sp. nov.

urn:lsid:zoobank.org:act:E56EF24B-276E-439A-AAB7-F7B924E8A78E

( Figs. 19–36 )

Type material. Holotype male ( CNAN-T01330 ), La Laguna , San Pedro Jocotipac, 17º43’37.7’’N, 97º6’6.1’’W, Oaxaca State, Mexico, 23.viii.2015, O. Francke, J. Cruz, D. Barrales, R. Monjaraz, J. Sánchez leg. Five male and six female paratypes ( CNAN-T01331 ), same data as holotype . Two male, two female and an immature paratypes ( CNAN-T01332 ), El Tanque , San Pedro Jocotipac, 17º44’34.5’’N, 97º6’20.2’’W, Oaxaca State, Mexico, 23.viii.2015, O. Francke, J. Cruz, D. Barrales, R. Monjaraz, J. Sánchez leg . Five male and a female paratypes ( CNAN-T01333 ), La Joya , San Pedro Jocotipac, 17º45’58.1’’N, 97º6’4.2’’W, Oaxaca State, Mexico, 23.ix.2015, J. Sánchez leg.

Etymology. The word ‘cuicateca’ means people from the region of Cuicatlán in northern Oaxaca, and where the type locality is found; the specific name is treated as an adjective in feminine form.

Distribution. Only known from the type locality and nearby records of the paratypes ( Fig. 57 ).

Diagnosis. Guelaguetzia cuicateca sp. nov. can be recognized from G. serrana sp. nov. by the following combination of characters: fixed finger of chelicera with a basal notch ( Fig. 24 ), pedipalpal femur with four large major spiniform setiferous tubercles ( Fig. 26 ), retrolateral apophysis of coxa IX spiniform ( Fig. 23 ), dorso-ectal apophysis on trochanter IV slightly larger than the central one ( Fig. 30 ), ventro-distal apophysis on trochanter IV slender and very curved ( Fig. 31 ), patella IV with two fused ventral apophyses ( Fig. 32 ), ventro-prolateral row of tubercles of femur IV formed by small tubercles only ( Figs. 28 and 32 ), and apical margin of flimsy lamina on male penis bilobed ( Fig. 36 ).

Description. Measurements of the holotype, scutum length: 4.1, scutum width at level of the mid-bulge: 3.3, RSC: 1.1, RHW: 2.4.

Dorsum ( Figs. 19, 21 , 22 ): Scutum type zeta (ζ) with the mid-bulge rounded, coda I deep and marked, coda II soft. Mesotergal areas with small central tubercles only, lateral margins of scutum with a continuous row of lateral pegs; two rows forming a “V” posterior to ocularium, the latter densely covered with small tubercles. Ocularium rounded and well-developed, prosoma with a soft hump behind ocularium. Free tergites with a transverse row of spiniform tubercles.

Venter ( Fig. 23 ): Venter densely covered with spiniform tubercles, slightly larger on coxa I. Coxa III slightly larger than coxa II. Coxa IV is the largest, occupying the greatest area in ventral view, sub-quadrangular shaped, with the ectal margins projected beyond the scutum margin; lateral sides with many spiniform tubercles, retrolateral apophyses spiniform. Stigmatic area short and compressed in the middle. Free sternites with a transverse row of spiniform tubercles, and anal plate covered with small tubercles.

Chelicerae ( Figs. 24, 25 ): Basichelicerite with a long bulla, well-marked, dorsally covered by many spiniform tubercles. Cheliceral hand swollen, inserted 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, posteriorly with four small, contiguous teeth apically; fixed finger with a basal notch, followed by four contiguous teeth, the basalmost largest.

Pedipalps ( Figs. 26, 27 ): Trochanter rounded, with a large ventral spiniform apophysis, dorsally with a few spiniform tubercles. Femur slightly compressed laterally and softly curved, dorsally ornate with many spiniform tubercles pointing forward, ventrally with a row of four long spiniform setiferous tubercles; between them are small 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, these tubercles on ectal margin are confined to the apical portion, on the mesal margin the basalmost is in the middle, the last two apically and very close to each other. Both margins of tarsus with four major setiferous tubercles, decreasing in size distally. Tarsal claw shorter than tarsus.

Legs ( Figs. 28–33 ): 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 spiniform apophyses dorsally, the ectal slightly larger; ventrally with three mesodistal apophyses, increasing in size distally and gradually curved from the basal-most to the apical-most. Femur IV thickened, curved and ornate with longitudinal rows of tubercles, with the two ventral rows more prominent, the retrolateral row has eight very large spiniform tubercles, followed distally by four small tubercles and ending in apical spine; prolateral row formed by small tubercles similar in size and ending in a apical spine also. Patella with apical apophyses on retro- and prolateral faces, and with two fused spiniform apophyses ventrally. Tibia slightly curved in the middle, slightly swollen distally, covered by longitudinal rows of spiniform tubercles, the two ventral barely larger, both ending in an apical spine. Tarsal count: 5(2):9(3):6:6.

Male genitalia ( Figs. 34–36 , 55 ): Pars distalis compressed laterally, somewhat rectangular in lateral view, with the flimsy lamina contiguous, undifferentiated and very large, with the apical margin forming two small lobes. Follis emerging from the cavity formed at the base of flimsy lamina, hidden and with two rounded lobes covering the stylus. With a remnant pair of macrosetae D on the dorsal 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 par distalis, slightly displaced to ventral portion; two pairs of filiform macrosetae A on the dorso-basal portion of par distalis; a pair of remnant sockets of macrosetae E on flimsly lamina, just distal to macrosetae C.

Female. Sexual dimorphism very noticeable: body and chelicerae smaller, and legs IV with the femora thinner and armature less developed ( Figs. 20 , 33 ), RSC=1.5 (n=9). 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 19–21. Guelaguetzia cuicateca sp. nov., holotype male (CNAN-T01330) and paratype female (CNAN-T01331). 19, habitus holotype, dorsal view. 20, habitus female, dorsal view. 21, lateral view holotype. Scale bars: 1 mm.

FIGURES 22, 23. Guelaguetzia cuicateca sp. nov., holotype male (CNAN-T01330). 22, scutum. 23, venter. Scale bars: 1 mm.

FIGURES 24–27. Guelaguetzia cuicateca sp. nov., holotype male (CNAN-T01330). 24, chelicera, frontal view. 25, chelicera, mesal view. 26, pedipalp, mesal view. 27, pedipalpal tibia and tarsus, ventral view (major spiniform setiferous tubercles on tibia indicated as T1–T3). Scale bars: 1 mm.

FIGURES 28–33. Guelaguetzia cuicateca sp. nov., 28–32: holotype male (CNAN-T01330). 28, leg IV, ectal view. 29, leg IV, mesal view. 30, trochanter IV, dorsal view. 31, trochanter IV, ventral view. 32, femur IV, ventral view. 33, paratype female (CNAN-T01331), femur IV, ventral view. Scale bars: 1 mm.

FIGURES 34–36. Guelaguetzia cuicateca sp. nov., penis of holotype male (CNAN-T01330). 16, dorsal. 17, lateral. 18, 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.