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FIGURE 5 in Eurycercus (Bullatifrons) norandinus (Crustacea: Branchiopoda: Eurycercidae), a new species of Cladocera in the Neotropical Region

FIGURE 5. Length-frequency distribution of the studied specimens (n = 44) of Eurycercus (Bullatifrons) norandinus n. sp. Development instars I–III, IV, V and eggs carrying females (reproductive) are indicated.

FIGURE 4 in Eurycercus (Bullatifrons) norandinus (Crustacea: Branchiopoda: Eurycercidae), a new species of Cladocera in the Neotropical Region

FIGURE 4. Regression lines of A, length of the headshield HL; B, number of postabdominal teeth NPT; C, number of proximal spinules of trunk limb I NPSLI, and D, number of marginal spinules of trunk limb I NMSLI, versus postabdominal length PL, in the species of Eurycercus (Bullatifrons). vern = vernalis, long = longirostris, pom = pompholygodes, nor = norandinus, macr = macrocanthus.

FIGURE 1 in Eurycercus (Bullatifrons) norandinus (Crustacea: Branchiopoda: Eurycercidae), a new species of Cladocera in the Neotropical Region

FIGURE 1. Eurycercus (Bullatifrons) norandinus n.sp., holotype female. A, parthenogenetic female; B, antennule; C, headpores; D, headshield with antennula, antenna and labrum; E, trunk limb I, exopodite, lateral view (corm not shown); F, trunk limb I, exopodite, inner distal lobe; G, trunk limb II, exopodite; H, trunk limb II, gnathobase. DS, distal spinules; GN, gnathobase; IDL, inner distal lobe; MS, marginal spinules; ODL, outer distal lobe; PS, proximal spinules.

FIGURE 3 in Eurycercus (Bullatifrons) norandinus (Crustacea: Branchiopoda: Eurycercidae), a new species of Cladocera in the Neotropical Region

FIGURE 3. Dendrogram showing the grouping of the species of Eurycercus (Bullatifrons) based on the degree of similarity of 14 morphological traits (based on table 3).

FIGURE 2 in Eurycercus (Bullatifrons) norandinus (Crustacea: Branchiopoda: Eurycercidae), a new species of Cladocera in the Neotropical Region

FIGURE 2. Eurycercus (Bullatifrons) norandinus n.sp., holotype female. A, trunk limb III, exopodite; B, trunk limb III, gnathobase; C, trunk limb IV, exopodite; D, trunk limb V, exopodite; E, postabdomen with postabdominal claw. BR, branchial plate; GN, gnathobase; SS, sensilla.

FIGURE 14 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 14. Distribution of species from the subgenus Eurycercus (Teretifrons) in Holarctic according to our original samples, no literature data included. Any localities from where any samples were investigated by the authors: small open circles. E. glacialis: solid quadrates (black in electronic version). E. nigracanthus: solid triangles (purple in electronic version). E. chernovi sp. nov.: large solid circles (red in electronic version).

FIGURE 10 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 10. Eurycercus chernovi sp. nov., parthenogenetic female from a lake about 150 m in diameter, north of settlement of Ust' Tareya, Taimyr Autonomous Area, Krasnoyarsk Territory, Russia (type locality). A, postabdomen. B, its distal portion. C, antenna I. D, antenna II. E, limb I. F–G, IDL of limb I. H, limb II. I, distal armature of its gnathobase. Scale bar denotes 1 mm for A–C, F–G, I; 0.1 mm for D–E, H.

FIGURE 9 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 9. Eurycercus chernovi sp. nov., parthenogenetic female from a lake about 150 m in diameter, north of settlement of Ust' Tareya, Taimyr Autonomous Area, Krasnoyarsk Territory, Russia (type locality). A, lateral view. B, anterior view. C, head, lateral view. D, head shield. E–H, head pores. I, labrum, ventral view. J, valve margin. K, armature of its antero-ventral portion. L, armature of its ventral portion. M, armature of its postero-ventral portion. N, armature of its posterior portion. Scale bar denotes 1 mm for A–C, E, J; 0.1 mm for D, F–I, K–N.

FIGURE 8 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 8. Eurycercus cf. nigracanthus, limbs of parthenogenetic female from tundra pond TP-3, Churchill, Manitoba, Canada. A, limb III. B, distal armature of its gnathobase. C, limb IV. D, distal armature of its gnathobase. E, limb V, F, its gnathobase. Scale bar denotes 0.1 mm.

FIGURE 7 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 7. Eurycercus cf. nigracanthus, parthenogenetic female from tundra pond TP-3, Churchill, Manitoba, Canada. A, postabdomen. B, its distal portion. C, postabdominal claw. D, antenna I. E, antenna II. F, proximal segments of exopod. G, limb I. H, IDL of limb I. I, limb II. J, distal armature of its gnathobase. Scale bar denotes 1 mm for A; 0.1 mm for B–J.

FIGURE 6 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 6. Eurycercus cf. nigracanthus, parthenogenetic female from tundra pond TP-3, Churchill, Manitoba, Canada. A–B, lateral view. C, head, lateral view. D, head shield. E, head pores. Scale bar denotes 1 mm.

FIGURE 11 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 11. Eurycercus chernovi sp. nov., limbs of parthenogenetic female from a lake about 150 m in diameter, north of settlement of Ust' Tareya, Taimyr Autonomous Area, Krasnoyarsk Territory, Russia (type locality). A, limb III. B, distal armature of its gnathobase. C, limb IV. D, distal armature of its gnathobase. E, limb V, F, its gnathobase. G, limb VI. Scale bar denotes 0.1 mm.

FIGURE 4 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 4. Eurycercus nigracanthus, parthenogenetic female from Round Pond, N of St. Johnes, Newfoundland, Canada. A, lateral view. B, dorsal view. C, anterior view. D, head, lateral view. E–F, head pores. G–I, armature of antero-ventral, ventral and posterior valve margin. Scale bar denotes 1 mm for A–D, 0.1 mm for E–I.

FIGURE 3 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 3. Eurycercus glacialis, thoracic limbs of parthenogenetic female from a shallow pond in sitka spruce temperate rainforest, Kodiak Island, Alaska, U.S.A. A, limb II. B, distal armature of its gnathobase. C, limb III. D, distal armature of its gnathobase. E, limb IV. F, distal armature of its gnathobase. G, limb V. H, its gnathobase. I, limb VI. Scale bar denotes 1 mm for A, C, I; 0.1 mm for B, D–H.

FIGURE 1. Eurycercus glacialis, parthenogenetic female from a in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 1. Eurycercus glacialis, parthenogenetic female from a shallow pond in sitka spruce temperate rainforest, Kodiak Island, Alaska, U.S.A. A, lateral view. B, anterior view. C, dorsal view. D, head, lateral view. E, head shield. F, head pores. G, labrum, ventral view. Scale bar denotes 1 mm for A–E, G; 0.1 mm for F.

FIGURE 2. Eurycercus glacialis, parthenogenetic female from a in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 2. Eurycercus glacialis, parthenogenetic female from a shallow pond in sitka spruce temperate rainforest, Kodiak Island, Alaska, U.S.A. A, postabdomen. B, its distal portion. C, dorso-distal portion. D, postabdomen basal portion. E, antenna I. F, antenna II. G, limb I. H–I, IDL of limb I. Scale bar denotes 1 mm for A, F–G; 0.1 mm for B–E, H–I.

FIGURE 5 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 5. Eurycercus nigracanthus, parthenogenetic female from Round Pond, N of St. Johnes, Newfoundland, Canada. A, postabdomen. B, its distal portion. C, its basal portion. D, antenna I. E, antenna II. F, IDL of limb I. Scale bar denotes 1 mm for A; 0.1 mm for B–F.

FIGURE 12. Eurycercus chernovi, adult male from a in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 12. Eurycercus chernovi, adult male from a small lake at the margin of a polygonal bog, Taimyr Autonomous Area, Krasnoyarsk Territory, Russia. A, lateral view. B, head. C, postabdomen. D, its distal portion. E, antenna I. F, limb I. G, its distal portion. Scale bar denotes 1 mm for A–B; 0.1 mm for C–G.

FIGURE 13 in A revision of the subgenus Eurycercus (Teretifrons) Frey, 1975 (Crustacea: Cladocera) in the Holarctic with description of a new species from Russian Arctic

FIGURE 13. Dorsal head pores of Eurycercus (Teretifrons) in lateral view. A, E. (T.) glacialis. B, E. (T.) nigracanthus. C, E. (T.) chernovi sp. nov. Not to scale.