Andalgalomys pearsoni (Myers, 1977)

Don E. Wilson, Russell A. Mittermeier & Thomas E. Lacher, Jr, 2017, Cricetidae, Handbook of the Mammals of the World – Volume 7 Rodents II, Barcelona: Lynx Edicions, pp. 204-535 : 530-531

749.

Pearson’s Chaco Mouse

Andalgalomys pearsoni

French: Phyllotis du Paraguay / German: Pearson-Chacomaus / Spanish: Raton del Chaco de Pearson

Other common names: Pearson's pericote

Taxonomy. Graomys pearsoni Myers, 1977 , 410 km (by road) NW Villa Hayes, Boqueron, Paraguay.

Two subspecies are recognized.

Subspecies and Distribution.

A.p.pearsoniMyers,1977—ChacoofWParaguayandsupposedlyNWArgentina(SaltaProvince).

A. p. dorbignyi Olds, S. Anderson & Yates, 1987 — SE Bolivia (Santa Cruz Department).

Descriptive notes. Head-body 86-126 mm, tail 97-136 mm, ear 18-24 mm, hindfoot 22-27 mm; weight 45 g. Both species of Andalgalomys are moderately small phyllotines, with large ears and whitish subauricular spots and post-auricular patches. Females apparently have three pairs of mammae (recorded on one Olrog’s Chaco Mouse, A. olrogi ). Dorsum of Pearson’s Chaco Mouse is brown, streaked with gray to pale reddish brown; venteris snow white; and small buffy to white spots occur below ears. Tail is ¢.100% of head-body length, bicolored (dorsal one-third brown, ventral two-thirds buffy), and sparsely haired, with no pencil. Diploid number varies from 2n = 76 in Bolivian populations to 2n = 78 in populations from Paraguay.

Habitat. Dry gasslands surrounded by thornscrub in Chaco biome.

Food and Feeding. Insect remains were found into the mouth of a trapped Pearson’s Chaco Mouse, but teeth morphology suggests a mostly herbivorous-granivorousdiet.

Breeding. Pearson’s Chaco Mouse apparently breeds in winter and spring (dry season); males with scrotal tested have been trapped in July and September.

Activity patterns. Pearson’s Chaco Mouse is nocturnal and terrestrial.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Least Concern on The IUCN Red List.

Bibliography. Braun (2015), Dunnum, Vargas, Bernal, Pardifnas & D’Elia (2016), Myers (1977), Olds et al. (1987), Teta, Jayat & Ortiz (2016), Williams & Mares (1978).

Figures

725. Haggard’s Leaf-eared Mouse (Phyllotis haggardi), 726. Andean Leaf-eared Mouse (Phyllotis andium), 727. Peruvian Leaf-eared Mouse (Phyllotis gerbillus), 728. Friendly Leaf-eared Mouse (Phyllotis amicus), 729. Narrow-nasal Leaf-eared Mouse (Phyllotis stenops), 730. Pearson’s Leaf-eared Mouse (Phyllotis pearson), 731. Western Leaf-eared Mouse (Phyllotis occidens), 732. Ancash Leaf-eared Mouse (Phyllotis definitus), 733. Lima Leaf-eared Mouse (Phyllotis limatus), 734. Master Leaf-eared Mouse (Phyllotis magister), 735. Yellow-rumped Leaf-eared Mouse (Phyllotis xanthopygus), 736. Osgood’s Leaf-eared Mouse (Phyllotis osgoodi), 737. Bunch Grass Leaf-eared Mouse (Phyllotis osilae), 738. Capricorn Leaf-eared Mouse (Phyllotis caprinus), 739. Tucuman Leaf-eared Mouse (Phyllotis tucumanus), 740. Walnut Leaf-eared Mouse (Phyllotis nogalaris), 741. Darwin’s Leaf-eared Mouse (Phyllotis darwinii), 742. Los Alisos Leaf-eared Mouse (Phyllotis alisosiensis), 743. Anita’s Leaf-eared Mouse (Phyllotis anitae), 744. Bonarian Leaf-eared Mouse (Phyllotis bonariensis), 745. Wolffsohn’s Leaf-eared Mouse 1 (apecomys wolffsohni), 746. Tapecua Leaf-eared Mouse (Tapecomys primus), 747. Southern Big-eared Mouse (Loxodontomys micropus), 748. Delicate Salt Flat Mouse (Salinomys delicatus), 749. Pearson’s Chaco Mouse (Andalgalomys pearsoni), 750. Olrog’s Chaco Mouse (Andalgalomys olrogi), 751. Garlepp’s Mouse (Galenomys garleppii), 752. Painted Big-eared Mouse (Auliscomys pictus), 753. Bolivian Big-eared Mouse (Auliscomys boliviensis), 754. Andean Big-eared Mouse (Auliscomys sublimis), 755. Sumichrast’s Vesper Rat (Nyctomys sumichrasti), 756. Yucatan Vesper Rat (Otonyctomys hatti), 757. Big-eared Climbing Rat (Ototylomys phyllotis), 758. La Pera Climbing Rat (Ototylomys chiapensis), 759. Peters’s Climbing Rat (Tylomys nudicaudus), 760. Chiapan Climbing Rat (Tylomys bullaris), 761. Tumbala Climbing Rat 1 (ylomys tumbalensis), 762. Watson’s Climbing Rat (Tylomys watsoni), 763. Fulvous-bellied Climbing Rat (Tylomys fulviventer), 764. Panama Climbing Rat (Tylomys panamensis), 765. Mira Climbing Rat (Tylomys mirae)

Subspecies and Distribution. A.p.pearsoniMyers,1977—ChacoofWParaguayandsupposedlyNWArgentina(SaltaProvince). A. p. dorbignyi Olds, S. Anderson & Yates, 1987 — SE Bolivia (Santa Cruz Department).