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Figure 6. Rhachotropis pilosa, DIVA 2 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 6. Rhachotropis pilosa, DIVA 2, Lucky Strike, Sintra, holotype female, 10 mm. (1) Habitus; (2) head with rostrum; (3) antenna 1; (4) antenna 2; (5) gnathopod 1; (6) gnathopod 2; (7) pereopod 3; (8) pereopod 4; (9) epimeral plates 2–3. Scale bars: 100 mm.

Figure 4. Rhachotropis licornia, FLAME 2, PPS3-H20 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 4. Rhachotropis licornia, FLAME 2, PPS3-H20, holotype, 10 mm. (1) Labium; (2) maxilla 1; (3) pereopod 3; (4) pereopod 4; (5) pereopod 5; (6) pereopod 6; (7) pereopod 7; (8) uropod 1; (9) uropod 2; (10) uropod 3; (11) telson. Scale bars: 100 mm.

Figure 8. Rhachotropis pilosa, DIVA 2 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 8. Rhachotropis pilosa, DIVA 2, Lucky Strike, Sintra, holotype female, 10 mm. (1) Antenna 1, flagellum; (2) antenna 1, article 3 of peduncle; (3) antenna 1, calceoli of article 3 of peduncle; (4, 5) antenna 1, calceoli; (6) surface of antenna 1. Scale bars: 1 mm (a); 100 mm (b); 10 mm (c).

Figure 2. Rhachotropis flamina, FLAME 2, PPS1-B1 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 2. Rhachotropis flamina, FLAME 2, PPS1-B1, holotype female, 8 mm. (1) Maxilliped; (2) pleosomite 1; (3) pleosomite 2; (4) pleosomite 3; (5) pereopod 3; (6) pereopod 5; (7) pereopod 6; (8) pereopod 7; (9) uropod 1; (10) uropod 2; (11) uropod 3; (12) telson. Scale bars: 100 mm.

Figure 3. Rhachotropis licornia, FLAME 2, PPS3-H20 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 3. Rhachotropis licornia, FLAME 2, PPS3-H20, holotype, 10 mm. (1) Habitus; (2) antenna 1; (3) antenna 2; (4) mandible; (5) maxilla 2; (6) maxilliped; (7) gnathopod 1; (8) gnathopod 2. Scale bars: 100 mm.

Figure 1. Rhachotropis flamina, FLAME 2, PPS1-B1 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 1. Rhachotropis flamina, FLAME 2, PPS1-B1, holotype female, 8 mm. (1) Habitus; (2) antenna 1; (3) mandible; (4) maxilla 1; (5) maxilla 2; (6) gnathopod 1; (7) gnathopod 2. Scale bars: 100 mm.

Figure 5. Rhachotropis licornia, FLAME 2, PPS3-H20 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 5. Rhachotropis licornia, FLAME 2, PPS3-H20, holotype, 10 mm. (1) Antenna 1, spine of the infero distal corner, article 1 of the peduncle; (2) antenna 1, article 1, shaft of the spine; (3) antenna 1, article 1, scales hookshaped in the half distal part of the spine; (4) antenna 1, calceoli of article 2; (5) antenna 2, setae tufts of the anterior margin of article 4; (6) antenna 2, calceolus of article 5. Scale bars: 100 mm (a); 20 mm (b); 10 mm (c).

Figure 7. Rhachotropis pilosa, DIVA 2 in Rhachotropis species (Crustacea: Amphipoda: Eusiridae) of hydrothermal vents and surroundings on the Mid- Atlantic Ridge, Azores Triple Junction zone

Figure 7. Rhachotropis pilosa, DIVA 2, Lucky Strike, Sintra, holotype female, 10 mm. (1) Mandible; (2) maxilla 1; (3) maxilla 2; (4) maxilliped; (5) pereopod 5, (6) pereopod 6; (7) pereopod 7; (8) uropod 1; (9) uropod 2; (10) uropod 3; (11) telson. Scale bars: 100 mm.

FIG. 10 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 10. — Colour photograph of a relatively large (carapace width estimated as between 7 and 8 mm) live megalopa stage of Bythograea thermydron Williams, 1980 collected from the East Pacific Rise (C. Epifanio and A. Dittel collection).

FIG. 9 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 9. — Megalopa stage of Bythograea, first and second antennae and sternal region: A, first antenna (antennule); B, second antenna; C, sternal region, anterior toward top of figure, with pereiopodal coxae indicated by dashed lines. Scale bars: 1 mm.

FIG. 8 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 8. — Megalopa stage of Bythograea, miscellaneous images: A, anterolateral region of carapace in dorsal view, white arrow indicating peritrichous ciliate (one of several found on carapace); B, higher magnification of ciliate marked by arrow in A; C, ventral view of left eyestalk and base of antenna; D, tip of endopod of second pleopod showing curved, interlocking serrate spines (cincinulli), disassociated in this view for clarity. Scale bars: A, 200 µm; B, 20 µm; C, 500 µm; D, 50 µm.

FIG. 6 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 6. — Megalopa stage of Bythograea, same individual as in Figure 1, selected appendages, abdomen, and telson: A, right cheliped, external view; B, dactylus of third pereopod,dorsal view; C, first pleopod, anterior view; D, fourth pleopod, anterior view; E, posterior two abdominal somites, telson, and uropods, dorsal view; F, ventral view of same region shown in E. Scale bars: A, 5 mm; B-F, 2 mm.

FIG. 7 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 7. — Megalopa stage of Bythograea, SEM photographs of chela and pereopods: A, anterior (outer) view of left chela; B, higher magnification of same appendage as in A showing details of chelipedal fingers; C, dactylus and distal region of propodus of fifth pereopod (walking leg); D, higher magnification of distal part of dactylus shown in C; note absence of curved serrate setae and serrate spines found in many other brachyuran megalopae. Scale bars: A, 1.0 mm; B, C, 0.5 mm; D, 200 µm.

FIG. 2 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 2. — Megalopa stage of Bythograea, selected SEM photographs of the carapace: A, anterior two thirds of carapace showing relative size of eyes, setal covering, and central protrusion (arrow); B, dorsal view of right anterolateral region of carapace and right chela; C, higher magnification of central carapace protrusion indicated by arrow in A; D, higher magnification of pappose setae from anterior dorsal region of carapace. Scale bars: A-C, 0.5 mm; D, 100 µm.

FIG. 4 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 4. — Megalopa stage of Bythograea, second and third maxillipeds: A, second maxilliped, outer view, left side; B, third maxilliped, inner view; C, third maxilliped and gill (detached), outer view. Scale bar: A, c. 1.5 mm; B, C, 2 mm.

FIG. 3 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 3. — Megalopa stage of Bythograea, mandibles, maxillae, and first maxilliped: A, outer (anterior) view (figure on left) and inner view of right mandible; paragnath shown only in outer view; B, first maxilla (maxillule), left side; C, second maxilla, left side; D, first maxilliped, inner view, left side; E, same appendage as D, outer view; arrow denotes serrate cleaning seta shown at higher magnification in Figure 5C and E. Scale bars: A-D, 1 mm; E not to scale.

FIG. 1 in The megalopa stage of the hydrothermal vent crab genus Bythograea (Crustacea, Decapoda, Bythograeidae)

FIG. 1. — Megalopa larval stage of a vent crab (Bythograea), entire specimen, dorsal view, based on a relatively large (carapace width 7.4 mm,carapace length 6.2 mm) specimen from the Epifanio and Dittel collection from the East Pacific Rise (Alvin Dive 3177). Scale bar: 10 mm.

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FIG. 2. — Nematocarcinus burukovskyi n in Two new species of Nematocarcinus A. Milne-Edwards, 1881 (Crustacea, Decapoda, Caridea, Nematocarcinidae) from hydrothermal vents on the North and South East Pacific Rise

FIG. 2. — Nematocarcinus burukovskyi n. sp., holotype subadult entire animal in lateral view. Scale bar: 10 mm.

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FIG. 9. — Nematocarcinus ovalis n in Two new species of Nematocarcinus A. Milne-Edwards, 1881 (Crustacea, Decapoda, Caridea, Nematocarcinidae) from hydrothermal vents on the North and South East Pacific Rise

FIG. 9. — Nematocarcinus ovalis n. sp., holotype ovigerous, HOPE 99, stn 54803#3, NEPR, cl 27.5 mm (MNHN-Na 15765); A, third abdominal somite, dorsal view; B, posterior part of left fifth abdominal pleuron, ventral view, showing inner ridge; C, posteroventral spots and posterior setal pits of sixth abdominal somite, ventral view (setae omitted); D, right antenna, ventral view (setae omitted); E, distal part of left antennal scale, ventral view; F, chela of right first pereopod, lateral view; G, distal part of dactylus of right first pereopod, lateral view; H, chela of left second pereopod, lateral view; I, dactylus and propodus of right third pereopod, lateral view; J, dactylus of right third pereopod, obliquely ventral view. Scale bars: A, D, 5 mm; B, C, F, H, I, J, 1 mm; E, 2 mm; G, 0.5 mm.