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FIGURE 2 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 2. Phylogenetic relationships for species of Eligmodontia resulting from the maximum-likelihood analysis of the entire 1143 bp of the cytochrome b gene with TrN+I+G model of sequence evolution (Lnl = -5739.812). Numbers above branches represent the percentage of 100 bootstrap iterations for which each clade was detected (only those clades detected in> 50% of the bootstrap iterations are shown). Character-state changes were polarized by designating Calomys, Graomys, Phyllotis, and Salinomys as the outgroup taxa.

FIGURE 7 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 7. Habitat near the type locality of Eligmodontia bolsonensis in peripheral sandy areas near the northern limits of the Salar de Pipanaco, Catamarca Province. The site is very near the type locality of Pipanacoctomys aureus, which is limited to the saline edges of the salt flat proper. Shrubs of this halophytic area include members of the Goosefoot Family, Chenopodiaceae, Atriplex lampa (foreground) and darker and taller Suaeda divaricata (mid-portion of the photograph). The taller trees in the background are Prosopis flexuosa. Dune habitats, on which E. bolsonensis also occurs, are visible in the distance near the Prosopis. The peak in the distance is the Nevado del Candado of the Sierra de Aconquija at 5450 m elevation.

FIGURE 1. Localities for Eligmodontia specimens sampled for 1143 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 1. Localities for Eligmodontia specimens sampled for 1143 bp of the cytochrome b gene are indicated by numbers (Table 2) and the following symbols: closed triangles = E. hirtipes; open triangles = E. puerulus; closed squares = E. morgani; open squares = E. typus (lowland); closed circles = E. typus (highland); open circles = E. moreni. Localities where E. typus (highland) and E. moreni were found in sympatry are indicated by half filled circles. Letters indicate type localities (Table 2) for the described taxa of Eligmodontia (Table 1).

FIGURE 4 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 4. Multivariate relationships of species of Eligmodontia. Projections of scores for principal components I, II, and III extracted from correlations of 20 external and cranial measurements. Taxa are indicated by the following symbols: M = E. moreni; L = E. typus (lowland); H = E. typus (highland).

FIGURE 6 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 6. Phylogenetic relationships of Eligmodontia (modified from Figs. 2 and 3). Indicated at nodes are Kimura-2 parameter sequence divergences and geological epochs. Major ecoregions for each species are indicated as follows: A=Altiplano; CS=Chaco Seco; E=Espinal; M=Monte; MSB=Monte de Sierras y Bolsones; Pt=Patagonia; and Pu=Puna.

FIGURE 5 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 5. Eligmodontia bolsonensis, new species (holotype, OMNH 34739); views from top to bottom: dorsal, ventral, and lateral views of skull, lateral view of mandible, occlusal view of upper molar toothrow (left), and occlusal view of lower molar toothrow (right). Greatest length of skull is 24.05 mm, length of maxillary toothrow is 3.68 mm, and length of mandibular toothrow is 3.67 mm.

FIGURE 3 in Phylogenetic and biogeographic relationships of gerbil mice Eligmodontia (Rodentia, Cricetidae) in South America, with a description of a new species

FIGURE 3. Relationships for species of Eligmodontia. This topology depicts only those clades receiving bootstrap support>70% (in maximum likelihood, unweighted parsimony, and minimum evolution analyses) and>0.95 (posterior probabilities in Bayesian analysis) for at least 3 of the 4 different methods of analysis. Numbers associated with internal lineages reflect bootstrap support (percentage) from Bayesian posterior probabilities and maximum likelihood above the line, and unweighted parsimony followed by minimum evolution below the line.

FIGURE 6. Eligmodontia dunaris MNHN 1546 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 6. Eligmodontia dunaris MNHN 1546 (holotype): dorsal (A), ventral (B) and lateral (C) views of skull. Occlusal view of upper (F) and lower molars (I) of paratype LCM 3377. Similar views of E. puerulus LCM 1993 (D and G) and E. hirtipes LCM 1748 (E and H) are included for comparisons.

FIGURE 4. Phylogenetic tree for 56 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 4. Phylogenetic tree for 56 Eligmodontia sequences and two outgroups resulting from the maximum-likelihood analysis of 1140 bp of the cytochrome b gene. Model of sequence evolution was HKY+G+I. Numbers above branches show the percentage values from 500 bootstrap iterations, and Bayesian posterior probabilities (>50 values).

FIGURE 3 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 3. Correspondence of G-band patterns between diploid chromosomes from Eligmodontia sp. 2N = 50 (left pair within each trio, large numbers below, male LCM 3374 from Playa Los Choros) and a representative haploid set from Eligmodontia hirtipes 2N = 50 (right, small numbers below, from male LCM 1283).

FIGURE 2 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 2. Chromosomes of Eligmodontia sp. ordered according size, 2N = 50 (male LCM 3374 from Playa Los Choros). From bone marrow spreads stained with standard Giemsa.

FIGURE 1 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 1. Map of southern South America showing localities for previously (numbered) and presently studied Eligmodontia specimens (modified from Mares et al. 2008). Below species names are modal diploid chromosome numbers/FN. New northcentral Chile Eligmodontia sites are marked with an X. Map of the infertile Atacama Desert in dark gray (from Latorre 2002).

FIGURE 5 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 5. Morphological multivariate relationships of Eligmodontia individuals from north-Central Chile and Argentina, and southern Peru. Projections of scores into Principal Component axes I and II were extracted from correlations of four body and eight skull measurements.

FIGURE 7 in A small, new gerbil-mouse Eligmodontia (Rodentia: Cricetidae) from dunes at the coasts and deserts of north-central Chile: molecular, chromosomic, and morphological analyses

FIGURE 7. (A) Eligmodontia dunaris MNHN 1547, paratype (Photo A. Spotorno). (B) Habitat at Playa Los Choros dunes, type locality (Photo C. Zuleta); intensive trapping at the plain belt (top, below sea border) failed to capture any Eligmodontia. (C) Eligmodontia dunaris captured and released alive at Caldera, Atacama, showing bipedal posture (Photo E. Valenzuela by permission).