Lemmus trimucronatus (Richardson, 1825) AY

Spitsyn, Vitaly M., Bolotov, Ivan N., Kondakov, Alexander V., Klass, Anna L., Mizin, Ivan A., Tomilova, Alena A., Zubrii, Natalia A. & Gofarov, Mikhail Y., 2021, A new Norwegian Lemming subspecies from Novaya Zemlya, Arctic Russia, Ecologica Montenegrina 40, pp. 93-117 : 116

Lemmus trimucronatus species complex

Distribution: Northern Asia east of the Kolyma River (Chukotka and Kamchatka peninsulas), and northern North America (Fedorov et al. 2003).

Comments: This informal category contains two sister species, i.e. Beringian L. nigripes (True, 1894) , and Canadian L. trimucronatus (Richardson, 1825) lemmings. The mean cytb p-distance between these taxa is as high as 7.2% ( Table 4), and they were fully supported as separate species-level units by our species delimitation modeling ( Fig. 2 ).

Figures

Figure 2. Maximum likelihood (IQ-TREE) phylogeny of Lemmus taxa based on the cytb gene haplotypes. The Novaya Zemlya Lemming (Lemmus lemmus chernovi ssp. nov.) is colored red. The numbers near nodes are ultrafast bootstrap support values/Bayesian posterior probabilities. The red asterisks indicate the putative species-level clades supported by bPTP and sPTP species-delimitation models. The scale bar indicates the branch length. Outgroup taxa (Dicrostonyx torquatus, D. hudsonius, Synaptomys cooperi, and Myopus schisticolor) are not shown.