Ayacucho pomacocha, 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

publication ID


publication LSID


persistent identifier


taxon LSID


treatment provided by

Arthropod Systematics & Phylogeny by Pensoft

scientific name

Ayacucho pomacocha

sp. nov.

3.16. Ayacucho pomacocha sp. nov.

Figs 2F View Figure 2 , 7I, J View Figure 7 , 15 A-C View Figure 15 , 22C, D View Figure 22 , 28 View Figure 28


MALE: Measurements (n =12). DSW: 3.2-4.0 (3.2); DSL: 4.7-5.3 (4.7); CL: 1.7-1.0 (1.7); FIVL: 4.5-5.0 (4.5); ChL: 1.2-3.5 (2.2). Coloration: (Fig. 22C View Figure 22 ) Dorsal scutum ranging from brown to yellowish-brown, with darker regions on the lateral margins of carapace and scutal areas of the DS and others lighter, as bands. Lateral regions of scutal areas darker than the center, or completely brownish. Posterior margin of DS and free tergites brown. Legs dark brown. Chelicerae and pedipalpus yellow. Dorsum: (Fig. 2F View Figure 2 ) Alpha-type DSS. Anterior margin of the dorsal scutum completely covered with granules, with median elevation. Ocularium totally covered with granules of equal size (a single specimen [on MZSP], has a pair of larger tubercles). Areas I-IV with a pair of slightly larger median tubercles. Posterior margin of DS and free tergites I-III with rows of tubercles larger than those of areas I-IV. Chelicerae: (Fig. 2F View Figure 2 ) Equal to the females (including the holotype), swollen in a single specimen. Segment I covered with granules. Segment II predominantly smooth, with a few hairs on the frontal surface; finger with two teeth. Segment III with two teeth. Pedipalpus : With very small granules sparsely distributed on the dorsal surface of the femur and the patella. Trochanter with a ventrodistal setiferous tubercle. Femur with a ventrobasal setiferous tubercle; a row of five small ventral setiferous tubercles, except at the ends of the article. Some males (n =3) have (at least in one of pedipalpus) a proapical setiferous tubercle, present in all females, but smaller. Tibia: prolateral IiIi, retrolateral iiIi. Tarsus: prolateral IIi, retrolateral Iii. Venter: Coxae I-II with granules in a row; Coxae III-IV with granules sparsely distributed. Smooth genital area. Free sternites I-IV and anal operculum with rows of small granules. Legs: (Figs 2F View Figure 2 , 7I, J View Figure 7 ) Coxae I-II with a retrolateral and a prolateral apophysis; coxa III with a prolateral apophysis; coxa IV with granules distributed throughout its length. Trochanters I-IV with few granules, unarmed. Femora I-III, with granules distributed throughout their length; femur IV with granules densely distributed throughout its length, except for a small ventroapical strip without granules. Patellae I-IV with granules distributed predominantly in the dorsal and lateral regions, scarcer ventrally. Tibiae I-IV with granules throughout their length. Tarsal segmentation: (n =12) 7, 11-12 (11), 7, 7-8 (8). Penis: (Fig. 17A-C View Figure 17 ) VP hexagonal in dorsal view; subrectangular in ventral view, with distal half larger than basal half; distal margin straight. MS C1-C9 subapical, long and curved; MS A1 median placed, long and straight (smaller than MS C); MS B1 sub basal, long and straight (longer than MS A); MS D1 very short, dorsally placed, near to MS A. Lateral sacs short, apically tapered; with long T3-like microsetae. Stylus apically robust, with a large dorsal projection, and several small apical projections. Dorsal process absent. Promontory slightly convex. - FEMALE: Measurements (n =12) DSW: 3.5-4.0; DSL: 4.8-5.2; CL: 1.7-1.9. FIVL: 4.5-5.0. ChL: 1.9-2.0. (Fig. 22D View Figure 22 ) Chelicerae slightly smaller than those of smaller males. Presence of a proapical setiferous tubercle in femur of pedipalpus (also seen in some males), higher than the tubercles of the ventral femur. Femur IV slightly thinner, with smaller granules. Tarsal segmentation: (n =12) 6, 11-12, 7, 8.


Similar to Ayacucho glauberrochai sp. nov., A. silvae sp. nov., A. titschacki and A. vargasllosai sp. nov. in the following combination of characteristics: dorsal scutum densely granulate; ocularium and areas I-IV of DS unarmed or armed with tiny tubercles, slightly greater than granules; posterior margin of DS and free tergites I-III with median rows of acuminate tubercles (Fig. 2F View Figure 2 ); femur IV of males without strong armature (Fig. 7I, J View Figure 7 ; except in ventral surface of femur IV in A. silvae sp. nov.). It differs from the previously mentioned species in the following combination of characteristics: ocularium unarmed and densely granulate (Fig. 2F View Figure 2 ); male femur IV unarmed (unlike A. silvae sp. nov.; Fig. 7I, J View Figure 7 ); penis VP hexagonal in dorsal view with straight distal margin; 9 pairs of subapical MS C (Fig. 15A-C View Figure 15 ).

Derivatio nominis.

The specific epithet, a noun in apposition, in reference to the type locality, Laguna Pomacocha ( Junín, Peru), a beautiful pond surrounded by grass and large rocks that harbor this species.


(Fig. 28 View Figure 28 ) PERU. Junín. Laguna Pomacocha.

Material examined.

Type material: Holotype ♂, ' PERU, Junín, Laguna Pomacocha , 4,500m a.s.l., 11°46′36″S, 75°14′07″W, 27/IV/2011, R. Pinto-da-Rocha, A. Benedetti, J. Ochoa & D. Silva leg. (MUBI) GoogleMaps - Paratypes 2 ♂, 3 ♀, ‘ditto’ (MUBI); Paratypes 3 ♂, 3 ♀, ‘ditto’ (MUSM); Paratypes 6 ♂, 6 ♀, ‘ditto’ (MZSP 36970);