Metasarcus fellinii, Benedetti & Pinto-da-Rocha, 2022

Benedetti, Alipio Rezende & Pinto-da-Rocha, Ricardo, 2022, Systematic revision and total evidence phylogenetic analysis of the Andean family Metasarcidae Kury, 1994 (Opiliones: Laniatores), with description of two new genera and twenty new species, Arthropod Systematics & amp; Phylogeny 80, pp. 309-388 : 309

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Metasarcus fellinii

sp. nov.

3.44. Metasarcus fellinii sp. nov.

Figs 5E View Figure 5 , 10G, H View Figure 10 , 19G-I View Figure 19 , 25E, F View Figure 25 , 31 View Figure 31


MALE: Measurements (n =5) DSW: 4.0-4.7 (4.7); DSL: 3.8-4.3 (4.3); CL: 1.5-1.7 (1.7). FIVL: 7.4-9.0 (9.0). ChL: 1.5-1.6 (1.6). Coloration: (Fig. 25E View Figure 25 ) Most body brown. Apophysis of tergite III dark, almost black. Lateral margins of DS dark brown. Trochanters yellowish brown. Area III armature and granules of DS and free tergites I-III orange. Dorsum: (Fig. 5E View Figure 5 ) Gamma-type DSS, with concave posterior margin of DS. Anterior margin of carapace with a median elevation, covered with irregular row of granules. Ocularium slightly medially depressed, unarmed, covered with granules. Carapace densely covered with granules of different sizes along its entire length. Areas I-IV densely covered with granules of different sizes. Area I divided by a longitudinal groove; with a median pair of acuminate tubercles. Areas II and IV unarmed. Area III armed with a pair of median spines. Lateral margins of DS densely granular, the granules being slightly more robust to those of carapace and areas. Posterior margin of DS and free tergites I-II with a row of granules similar to those on lateral margins of DS. Free tergite III with a large arched apophysis, apically forked, directed posteriorly, covered with small granules at base. Chelicerae: (Fig. 5E View Figure 5 ) Slightly larger than those of females. Segment I covered with small granules. Segment II with 3-4 small granules; finger with three teeth. Segment III with four teeth. Pedipalpus : With granules irregularly distributed over the entire length, except tibia and tarsus. Trochanter with a ventroapical spine. Femur with a small ventroapical setiferous tubercle; a ventral row of four spines along its length and a proapical spine. Patella with a proapical spine. Tibia retrolateral IiII, prolateral iIIIi/iiIi. Tarsus: retrolateral Iii/iIiIi/iiII, prolateral II. Venter: Coxae I-IV densely covered of granules. Coxa I with a median row of 3-4 small setiferous tubercles. Genital area with a few sparse granules. Free sternites I-IV with a row of small tubercles. Legs: (Figs 5E View Figure 5 , 10G, H View Figure 10 ) Coxae I-II each with a prolateral and a retrolateral apophysis. Coxa III with a prolateral apophysis. Coxa IV with a dorsoapical row of seven small tubercles; two small retrolateral tubercles and granules of varied sizes throughout its extension. Trochanters I-II smooth. Trochanters III-IV with a dorsoapical wide base blunt tubercle. Femora I-III straight and unarmed, with small granules. Femur IV slightly curved and unarmed, granular. Tarsal segmentation: (n =5) 6-8 (8), 9-11 (11), 7-8 (8), 8-9 (8). Penis: (Fig. 19G-I View Figure 19 ) VP subrectangular, with parallel sides; distal margin straight; straight in lateral view; VP with two distal lateroventral depressions. MS C1-C4 apical long and straight; MS A1 median long and straight (about half the length of the MS C); MS B1-B2 sub basal short and straight (MS B2 longer than MS B1); MS D1 short and straight, dorsally placed, near MS C4. Lateral sacs short, with short T3-like microsetae. Stylus with projections at the apex and an armed projection directed ventrally. Dorsal process short and blunt. Promontory truncated. - FEMALE: Measurements (n =10) DSW: 3.5-4.0; DSL: 3.5-4.1; CL: 1.2-1.5. FIVL: 6.6-7.2. ChL: 1.2-1.8. (Fig. 25F View Figure 25 ) Chelicerae slightly smaller. Granules in dorsal scutum denser concentrated than in male. Apophysis of free tergite III short, spiniform. Tarsal segmentation: (n =10) 6, 7-11, 7-9, 8-9


It differs from other species of the genus because males present an extremely long apophysis in free tergite III with forked apex (Fig. 5E View Figure 5 ). The females have short and simple apophysis, and are similar to Metasarcus bolivianus (whose male is unknown). It differs from M. bolivianus to present a greater density of granules in the dorsal scutum (Fig. 25F View Figure 25 ) and being smaller.

Derivation nominis.

The specific epithet of masculine gender, in the genitive form, dedicated to the Italian filmmaker and screenwriter Federico Fellini (1920-1993).


(Fig. 31 View Figure 31 ) BOLIVIA. Tarija. Near Entre Ríos.

Material examined.

Type material: Holotype ♂, ' BOLIVIA, Tarija, near Entre Ríos, Paraiso del Tordo , 21°35′54.7″S 64°08′58.4″W, 05/XII/2010, R. Pinto-da-Rocha, A. Benedetti, J. Ochoa & A. Saravia leg. (CBF) GoogleMaps - Paratypes 1 ♂, 5 ♀, ‘ditto’ (CBF); Paratypes 3 ♂, 5 ♀, ‘ditto’ (MZSP 36987).