Figures & data
Table I. Localities and GenBank accession numbers of specimens used for the current study. N – 54
Figure 1. Phylogenetic relationships of Dikerogammarus species based on maximum-likelihood gene trees (left) and haplotype networks (right) of the COI and 28S fragments. Numbers above tree branches represent statistical support (ultrafast bootstrap and Shimodaira-Hasegawa approximate likelihood ratio test). Colored boxes next to the trees indicate the results of the species delimitation analyses. Numbers within the mPTP column are posterior probabilities for species support.
![Figure 1. Phylogenetic relationships of Dikerogammarus species based on maximum-likelihood gene trees (left) and haplotype networks (right) of the COI and 28S fragments. Numbers above tree branches represent statistical support (ultrafast bootstrap and Shimodaira-Hasegawa approximate likelihood ratio test). Colored boxes next to the trees indicate the results of the species delimitation analyses. Numbers within the mPTP column are posterior probabilities for species support.](/cms/asset/18d61c8a-b5a5-401e-b0b8-e27ab843b391/tizo_a_2018056_f0001_oc.jpg)
Figure 2. Phylogeny of Dikerogammarus based on a combined COI and 28S dataset. Left, time-calibrated Bayesian species tree. Numbers above branches are posterior probabilities. Right, maximum-likelihood tree based on locus concatenation. Numbers above branches represent statistical support from ultrafast bootstrap and the Shimodaira-Hasegawa approximate likelihood ratio test.
![Figure 2. Phylogeny of Dikerogammarus based on a combined COI and 28S dataset. Left, time-calibrated Bayesian species tree. Numbers above branches are posterior probabilities. Right, maximum-likelihood tree based on locus concatenation. Numbers above branches represent statistical support from ultrafast bootstrap and the Shimodaira-Hasegawa approximate likelihood ratio test.](/cms/asset/84f12a54-f309-4f72-9666-4235c18f03fe/tizo_a_2018056_f0002_oc.jpg)
Table II. Results of Bayes factor species delimitation (BFD) based on Bayesian multilocus analysis of COI and 28S fragments
Figure 3. Distribution of D. bispinosus MOTUs: D. bispinosus 1 – red; D. bispinosus 2 – yellow; D. bispinosus 3 – blue.
![Figure 3. Distribution of D. bispinosus MOTUs: D. bispinosus 1 – red; D. bispinosus 2 – yellow; D. bispinosus 3 – blue.](/cms/asset/f60ba890-8309-47d0-8114-d9740642ac20/tizo_a_2018056_f0003_oc.jpg)
Table III. Estimates of evolutionary divergence between groups (mean p-distances) based on COI gene region (below diagonal) and 28S (above diagonal)
Figure 4. SEM pictures of antenna 2 and gnathopod 2 from D. bispinosus 1 (A, B), D. bispinosus 2 (C, D) and D. bispinosus 3 (E, F) respectively.
![Figure 4. SEM pictures of antenna 2 and gnathopod 2 from D. bispinosus 1 (A, B), D. bispinosus 2 (C, D) and D. bispinosus 3 (E, F) respectively.](/cms/asset/4baf2d04-f6ff-441d-b418-e2cb63ac0505/tizo_a_2018056_f0004_b.gif)