Allpamayu Nelson, Juan, Chaparro, Ochoa, Allen & West, 2026, n. gen.

Matías Beratz Nelson; Nelson Ferretti Juan; Juan C. Chaparro; Jose Antonio Ochoa; Joshua P. Allen; Rick C. West · (2026) · DOI: 10.5281/zenodo.19571561

Resumen

Allpamayu n. gen. (Figs 2-7) urn:lsid:zoobank.org:act: F5F64DBC-84A9-4050-BBDA-746404D2AC87 TYPE SPECIES. — Allpamayu suyuwixsa n. sp. ETYMOLOGY. — The generic epithet works as a noun in apposition referring to the Alpamayo mountain at 5947 m. a.s.l., known as the world´s most beautiful mountain because of the symmetry of its lines or canals on one surface, which resemble the stripes on the dorsal abdomen of the species described. “ Allpamayu ” is the name in Quechua for Alpamayo mountain (Academia Mayor de la Lengua Quechua 2005). DIAGNOSIS. — Allpamayu n. gen. differs from the remaining Ischnocolinae by the following unique combination of characters: presence of a striped abdomen (Figs 5B, C; 7D), a low number of labial cuspules (ranging from 20-22) (Figs 2F; 5F) and clavate trichobothria on tarsi forming two parallel rows along half of tarsus length (Fig. 6C). Males of Allpamayu n. gen. differ from those of all known Ischnocolinae by the unique combination of two keels on the palpal bulb (Figs 4 A-D), erected long and strong setae on apical cymbium (Fig. 4 E-F), a transverse white line on tarsi of all legs (Fig. 3A) and the presence of metatarsal ventral tumescence on the first pairs of legs (Fig. 3B). The general structure of the palpal bulb resembles that of Holothele (mainly the Caribbean species) due to its elongated tegulum, twisted, long and sinuous embolus and the presence of a keel (Fig. 1). However, Allpamayu n. gen. is clearly distinct in having two keels along the embolus (Fig. 4A; D) with a low crest between them in conjunction with a low number of labial cuspules (around 100 in Holothele spp., about 20 in Allpamayu suyuwixsa n. gen, n. sp.). Females are easily distinguished from all known Ischnocolinae genera by the combination of clavate trichobothria on the tarsi forming two parallel rows along half the tarsus length (Fig. 6C), tarsus IV without pseudosegmentation (Fig. 6A, B) and spermathecae with basal large subquadrate receptacles and a short wide duct oriented laterally and pointing upwards carrying two to three rounded lobes (Fig. 5H). AFFINITIES. — Allpamayu n. gen. resembles Holothele in the general aspect of the palpal bulb and tibial apophysis of males, but differs by the stripes on the abdomen along with a low number of labial cuspules and metatarsal tumescence on the first pair of legs. The genus Holothele includes two morphological distinct groups: first, Holothele longipes with a wide distribution in South America, from which Allpamayu n. gen. males and females can be distinguished by the presence of stripes on the abdomen, males having keels in the palpal bulb and females differing in the shape of the spermathecae; and second the species of Holothele from the Caribbean Islands [H. culebrae (Petrunkevitch, 1929), H. denticulate (Franganillo, 1930), H. shoemakeri (Petrunkevitch, 1926) and H. sulfurensis Maréchal, 2005], from which males can be distinguished by the presence of two keels on the palpal bulb instead of one well-developed keel along the embolus length and metatarsal tumescence on the first pair of legs, females differing by the shape of the spermathecae and both can be distinguished by the stripped abdomen. Allpamayu n. gen. resembles Catumiri in the low number of cuspules but differs by the clavate trichobothria on tarsi forming two parallel rows along half of tarsus length and the genitalic characters such as the palpal bulb of males and the spermathecae of females. Females also resemble Dolichothele in the low number of labial cuspules and clavate trichobothria in two parallel rows but differ by the anterior tarsal scopulae divided and presence of stripes on the abdomen.

Instituciones: Universidad Nacional de San Antonio Abad del Cusco