Paramitraceras pickardcambridgei, Cruz-López, Jesús A. & Francke, Oscar F., 2013

Cruz-López, Jesús A. & Francke, Oscar F., 2013, Two new species of the genus Paramitraceras Pickard-Cambridge, 1905 (Opiliones: Laniatores: Stygnopsidae) from Chiapas, Mexico, Zootaxa 3641 (4), pp. 481-490 : 2-3

Paramitraceras pickardcambridgei sp. nov.

( Figures 3 , 4–10 , 25–30 )

Paramitraceras granulatus (partim): Goodnight and Goodnight (1953a): 25 (Pichucalco specimen), misindentification.

Type material: male holotype (CNAN-0731) [July/17/1947; C. & M. Goodnight], (lat 17.50861º lon -93.11833º), MEXICO: Chiapas: Pichucalco.

Etymology: The specific name is a patronymic in honor of O. F. Pickard-Cambridge, the author who described the genus and its type species.

Diagnosis: Differs from P. femorale , P. hispidulum and P. veracruz in males having a bigger cheliceral hand. Similar to P. granulatum and P. t z o t z i l sp. nov., but it is distinct in the distal apex of the eye mound; dorsal body ornamentation composed of numerous spiniform setae; middle tooth of the cheliceral movable finger rounded; basal tooth of the fixed finger low; medium notch of cheliceral fixed finger shallow, wide; mesodistal tubercle of the pedipalpal tibia with basal bulge; mesal margin not convex in middle portion; femur and tibia IV with ventrodistal tubercles slightly developed; male genitalia with middle portion of pars distalis wide, lateral setae arranged in two rows (with four and six setae, respectively).

Description. Male holotype: Measurements: Scutum length: 4.9, scutum width: 4.1.

Dorsum: Granulose, densely covered by small rounded tubercles; setae of these tubercles long and spiniform, longer posteriorly; eye mound conical, apex not elongated, straight in both anterior and posterior margins; eye mound ornamentation similar to body ( Fig. 7 ).

Venter: Tubercles similar in size and shape to those on dorsum; setae longer in free sternites; lateral margins of the sternum short, only present between fourth coxae.

Chelicera: Scutum /cheliceral hand ratio: 1.37. Middle tooth of movable finger rounded, pointing to fixed finger base. Basal tooth of the fixed finger inconspicuous, flat; median notch shallow, wide, approximately half of fixed finger length; middle tooth hump-shaped, low ( Fig. 8 ). Cheliceral hand covered with a few long setae at the fingers base.

Pedipalps: Measurements: 2.30/1.00/1.75/1.80/1.00. Femur with six rounded tubercles ventrally, scattered, decreasing in size distally. Tibia with ectodistal tubercle hook-shaped, distally rounded; mesodistal tubercle flat, with basal bulge. Tarsus widened in middle, spoon-shaped, mesal margin with at most eight robust spiniform setae, not uniformly scattered ( Figs. 4–6 ).

Legs: Measurements: I: 2.70/0.97/2.00/2.32, II: 3.50/1.35/2.85/3.20, III: 2.90/1.00/2.35/2.80, IV: 3.65/1.00/ 3.10/3.80. All legs similar in ornamentation; densely covered with small rounded tubercles, like those on the dorsum. Femur IV with a row of tiny spiniform tubercles ventrally; ectodistal tubercle thorn-shaped, similar to ectodistal tubercle on tibia IV ( Fig. 10 ).

Genitalia: Pars distalis wide in middle, with distal edge dorsally turned and concave in the middle; bilobular projection with lateral lobes stout, distally pointed, spiniform projections hidden behind stylus. Lateral setae arranged in two rows, the basal row composed of four setae, distoventral seta separate from the rest; lateral row composed of six setae, along lateral edge of pars distalis, distal pair slightly ventral, close to ventral microsetae. Lateral setae slightly spatulate distally ( Figs. 25–30 ).

Female: Unknown.

Distribution. Known only from the type locality.

Figures

FIGURES 1 – 3. Males of three species of the Paramitraceras Pickard-Cambridge, 1905, dorsal view. 1, Paramitraceras granulatum Pickard-Cambridge, 1905 from Mexico: Chiapas: Tapachula. 2, Paramitraceras tzotzil sp. nov., male holotype. 3, Paramitraceras pickardcambridgei sp. nov., male holotype.

FIGURES 4 – 10. Paramitraceras pickardcambridgei sp. nov. Male. Right pedipalp (4 – 6): 4, ectal view. 5, mesal view. 6, frontal view. 7, habitus lateral view. Right chelicera (8 – 9): 8, frontal view. 9, ectal view. 10, left leg IV prolateral view. Scale. Figures 4 – 6: 5. 7: 2.5. 8 – 10: 4. Arrows indicate measurements taken to obtain the scutum / cheliceral hand ratio.

FIGURES 25 – 30. Paramitraceras pickardcambridgei sp. nov. Male genitalia (Drawn from dirty SEM photos). Pars distalis (25 – 27): 25, dorsal view. 26, lateral view. 27, ventral view. 28, details of follis. 29, details of lateral seta. 30, details of a ventral microsetae. Abbreviations. BLP: bilobular projection, DE: distal edge, F: follis, LS: lateral setae, S: stylus, SP: spiniform projections, VMS: ventral microsetae.