Ampliphallus chimalapaensis, 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 : 435-437

Ampliphallus chimalapaensis sp. nov.

urn:lsid:zoobank.org:act:34B65CBD-2288-449F-BFBC-AC9E8621829B

( Figs. 1–18 )

Type material. Holotype male ( CNAN-T01327 ), Escolapa , Santa María Chimalapa, 16º51’2.0’’N, 94º44’53.0’’W, Oaxaca State, Mexico, 27–29.x.2016, A. Valdez, E. Briones, A. Juárez, J. Velardi leg . Six male, nine female and four immature paratypes ( CNAN-T01328 ), same data as holotype . Four male, four female and an immature paratypes ( CNAN-T01329 ), Cueva de Escolapa , Santa María Chimalapa, 16º51’2.0’’N, 94º44’53.0’’W, Oaxaca State, Mexico, 25–26.x.2016, A. Valdez, E. Briones, A. Juárez, J. Velardi leg.

Etymology. Toponymical, from the Rain Forest region of Chimalapa.

Distribution. Known only from the type locality (Escolapa, Santa María Chimalapa, Oaxaca, Mexico) and records of the paratypes ( Fig. 57 ).

Diagnosis. As for the genus.

Description of the holotype. Measurements, scutal length: 4.4, scutal width at level of the mid-bulge: 2.9, RSC: 1.3, RHW: 2.3.

Dorsum ( Figs. 1, 3 , 4 ): Scutum type zeta (ζ), mid-bulge rounded, both coda I and II deep and well-marked. Each mesotergal area covered by many spiniform tubercles, lateral margins of scutum with a continuous rows of lateral pegs, two rows forming a “V” posterior to ocularium; ocularium densely covered by 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. 5 ): Venter covered by spiniform tubercles, slightly larger on coxa I. Coxa III slightly larger than coxa II, coxa IV is the largest, sub-rectangular in shape; stigmatic area large and compressed in the middle. Free sternites with a transverse row of spiniform tubercles, anal plate with long cylindrical setiferous tubercles.

Chelicerae ( Figs. 7, 8 ): Basichelicerite with a bulla well-marked, dorsally and ventrally covered by spiniform tubercles. Cheliceral hand swollen, with the basichelicerite inserted near the middle portion. Cheliceral dentition heterogeneous, basal tooth of the movable finger blunt, with three small and contiguous teeth in the middle on the same finger; fixed finger with three small teeth near the base.

Pedipalps ( Figs. 9, 10 ): Trochanter globular, with a dorsal and two ventral long spiniform apophyses. Femur slightly compressed laterally, dorsally covered with many spiniform tubercles, ventrally with a row of 10 long spiniform setiferous tubercles, the second and the fifth are the largest. Patella unarmed, only with spiniform tubercles dorsally. Tibia rectangular in cross section, each margin with three (III, 2> 1=3) and (IIi, 2> 1> 3) major setiferous tubercles; between these major tubercles there are small setiferous ones on both margins. Both margins of tarsus with four major setiferous tubercles similar in size. Tarsal claw shorter than tarsus.

Legs ( Figs. 11–15 ): Measurements in Table 2 . Legs I, II and III slender, covered by small tubercles. Trochanter III not globose. Trochanter IV not swollen, with two spiniform tubercles dorsally and with retrolateral spiniform apophysis. Femur IV slightly thicker than femur III, with two ventral rows of small tooth-shaped spines, especially the retrolateral row which is slightly developed, at the end of both rows there are two spiniform tubercles. Patella covered throughout by many small tubercles, apical tubercles on dorsal and ventral surfaces slightly larger. Tibia covered by many small tubercles, the two ventro-apical ones forming small spines. Tarsal count: 5(2):12(3):6:6.

Male genitalia ( Figs. 16–18 ): Pars distalis wide, oval and softly bent dorsally, junction of pars distalis and truncus membranous, probably flexible. Flimsy lamina differentiated from the pars distalis, with a dorsal channel, with the follis emerging from the junction flimsy lamina-pars distalis, follis with no evidence of lobes. With a pair of spiniform macrosetae D lateral to follis, two pairs of apically spatulate macrosetae C in the junction of flimsy lamina and pars distalis, with a pair of spatulate macrosetae A on the basal membranose area of pars distalis and with two pairs of spiniform macrosetae B on the truncus, just basal to the membranose area.

Female. Similar to the male, but with the cheliceral area a little smaller ( Fig. 2 ), RSC=~1.6 (n=13); femur IV slightly thinner and armature less developed. 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 1–3. Ampliphallus chimalapaensis sp. nov., holotype male (CNAN-T01327) and paratype female (CNAN-T T01328). 1, habitus holotype, dorsal view. 2, habitus female, dorsal view. 3, lateral view holotype. Scale bars: 1 mm.

FIGURES 4–6. Ampliphallus chimalapaensis sp. nov., holotype male (CNAN-T01327). 4, dorsal scutum. 5, venter. 6, anal plate, ventral view. Scale bars: 1 mm.

FIGURES 7–10. Ampliphallus chimalapaensis sp. nov., holotype male (CNAN-T01327). 7, chelicera, frontal view. 8, chelicera, mesal view. 9, pedipalp, mesal view. 10, pedipalpal tibia and tarsus, ventral view (major spiniform setiferous tubercles on tibia indicated as T1–T3). Scale bars: 1 mm.

FIGURES 11–15. Ampliphallus chimalapaensis sp. nov., holotype male (CNAN-T01327). 11, trochanter IV, dorsal view. 12, trochanter IV, ventral view. 13, leg IV, ectal view. 14, leg IV, mesal view. 15, femur IV, ventral view. Scale bars: 1 mm.

FIGURES 16–18. Ampliphallus chimalapaensis sp. nov., penis of holotype male (CNAN-T01327). 16, dorsal. 17, lateral. 18, ventral. Macrosetae groups: yellow=A, blue=B, pink=C, green=D. Scale bars: 100 µm.