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Study area. Type locality indicated with triangle. Insert shows the type locality (Água Fria River, National Park of the Chapada dos Veadeiros, Brazil) of Eirinicaris antonioi sp. n.
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Eirinicaris antonioi sp. n. Male: A habitus, lateral view; B anal somite with caudal furca, lateral view; C anal somite with caudal furca, dorsal view; D anal somite with caudal furca, ventral view; E mouthparts; e1 antennule; e2 mandible; e3 maxillulae; e4 maxillae; e5 maxilliped. Scale bars: 1 = 50 µm (A); 2 (B, C, D) = 50 µm; 3 (E) = 20 µm.
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Eirinicaris antonioi sp. n. Male: A antennule, with process arrowed on segment seven, segment six laterally detached; B P1, anterior; C P2, anterior; D P3, anterior; d1 distal part of exopod of P3 showing the apophysis, anterior; d2 distal part of exopod of P3 showing the apophysis, posterior; E P4, anterior; F P5, with distal pore arrowed. Scale bar = 25µm.
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Eirinicaris antonioi sp. n. Female: A antennule; B P1, depicted with coxa, basis enp-1 and exp-1; C P2 enp; D P3, anterior; E P4 anterior; F P5, with distal pore arrowed; G genital field; H anal somite with caudal furca; I furca, lateral view. Scale bar 1 (A, F) and 2 (C, D, E, G, H, I) = 25µm.
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SEM image of Eirinicaris antonioi sp. n. A male habitus, lateral view; B female habitus, ventral view. Scale bar A = 10µm; B = 20µm.
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SEM image of Eirinicaris antonioi sp. n. Male: A antennule in lateral view; B antennule segments 6 (yellow) and 7 (coral); C antennule, segment 8 showing modified seta; D telson and furca, lateral; E furca, dorsal view; F furca, ventral view, showing modified setae I, II and III and distal pore arrowed. Scale bars A = 10µm; B = 1µm; C = 200µm; D = 2µm; E = 2µm; F = 2µm.
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SEM image of Eirinicaris antonioi sp. n. Male: A P1 showing inner seta of basis; B P3 with endopod and thumb in colour, P4; C claviform aesthetasc representing the endopod of P3; D P5, lateral view, with distal pore arrowed; E P5 and P6. Female: F pro- and urosomites, ventral view showing endopods of P3 and P4, and P5 and P6. Scale bars A = 10µm; B = 10µm; C = 1µm; D = 2µm; E = 2µm; F = 102µm.
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Eirinicaris antonioi sp. n. Female: A last urosomite, telson and furca, ventral view, proximal and distal pores arrowed; B telson and furca, lateral view. Scale bars A = 2µm; B = 10µm.
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Phylogeny of the Parastenocaridinae reconstructed by applying Hennigian principles and criterion of putative parsimony based on the data matrix of Table