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FIG. 12 in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 12. — Austinograea sp. aff. A. alayseae Guinot, 1990, ♂ 31.3 × 48.8 mm (right-handed), ♀ 29.6 × 44.8 mm (left-handed), Manus Basin, Shinkai 2000, 3°43.60'S, 151°40.32'E, PACMANUS site, field E, 1676 m (see Tsuchida & Hashimoto 2002), MNHN-IU-2016-10750 (= MNHN-B28761): A, male chelae, crusher and cutter, outer surfaces of palms; B, female chelae, cutter and crusher, outer surfaces of palms.

FIG. 11. — Austinograea jolliveti n in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 11. — Austinograea jolliveti n. sp., holotype, ♂ 12.8 × 20.0 mm (right-handed), North Fiji Basin, STARMER II cruise, dive 18 (PL 18), Mussel Valley site, 18°50'S, 173°29'E, 2750 m, MNHN-IU-2016-10769: A, mxp3; B, thoracic sternum; C, G1 and G2 in situ (reconstructed); D, G1, two views; E, G2, two views. Scale bars: B, 5 mm; D, 1 mm; E, 0.5 mm (note the scale bars of the two gonopods, the G2 being about half-length of G1); A, C, without scale.

FIG. 4. — A-C, Austinograea hourdezi n in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 4. — A-C, Austinograea hourdezi n. sp., holotype, ♂ 25.7 × 40.2 mm (right-handed), Lau Back-Arc Basin, TUIM06MV cruise, dive 142, Tow Cam site, 20°19.07'S, 176°08.24'W, 2719 m, MNHN-IU-2016-10737: A, B, chelae with two coloured spots on outer surface of palm of right crusher (A) and left cutter (B); C, G1 and G2 photographed in situ; D, E, Austinograea hourdezi n. sp., atypical ♀ 30.0 × 48.5 mm (right-handed), Lau Back-Arc Basin, MGLN07MV cruise, dive 230, Kilo Moana site, 20°03.23'S, 176°08.01'W, 2623 m, MNHN-IU-2016-10752: D, crusher with one marked dark spot and the other one, only discernible by a yellow trace (wound at base of fixed finger is not a spot comparable to that of A. jolliveti n. sp.); E, cutter with two indistinct spots, only as yellow traces.

FIG. 3. — Austinograea hourdezi n in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 3. — Austinograea hourdezi n. sp. photographed in situ: A, Lau Basin, Lau Basin 2009 cruise, dive 432, Tow Cam site, 20˚18.98'S, 176˚08.19'W, 2723 m, 05.VI.2009 (type locality), among sessiles barnacles Eochionelasmus ohtai ohtai Yamaguchi, 1990. The two dark spots on outer surface of palm of both chelae indicate a male; see patches of dense setae on inner surface of both chelae, and the darkly coloured two-thirds of dactylus of right cheliped; B, C, Austinograea hourdezi n. sp., due to the patch of dense setae on inner surface of both chelae: B, Lau Basin, TUIM07MV cruise, dive 163, ABE site, 20°45.65'S, 176°11.45'W, 2130 m, 23.VI.2005; on a bed of gastropod Ifremeria nautilei Bouchet & Warén, 1991; C, Lau Basin, Lau Basin 2009 cruise, dive 431, ABE site, 20°45.65'S, 176°11.45'W, 2130 m, 03.VI.2009. The crab and the gastropods Alviniconcha hessleri sensu lato are blurry, the photography in situ having been taken in hydrothermal diffuse area with the emanating fluid visible as shimmering water. Photographies courtesy of C. R. Fisher (Penn State University, USA).

FIG. 8. — A, B in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 8. — A, B, Austinograea alayseae Guinot, 1990, photographed in situ: see absence of patches of setae on inner surface of chelae: A, crab with white carapace, Lau Basin 2009 cruise, Kilo Moana site, 20°03.23'S, 176°08.01'W, 2621 m, among mussels Bathymodiolus brevior Cosel, Métivier & Hashimoto, 1994 and snails Ifremeria nautilei Bouchet & Warén, 1991; B, crab with carapace stained orange due to iron or manganese oxide deposits, and cluster of alvinocaridid shrimps, Lau Basin, TUIM07MV, Kilo Moana site, 20°03.23'S, 176°08.01'W, 2621 m; C, Austinograea hourdezi n. sp. (presumed identification, see p. 89), Lau Basin, Lau Basin 2009 cruise, Kilo Moana site, among mussels Bathymodiolus brevior, gastropods Ifremeria nautilei, sea anemone probably Cyananthea hourdezi Zelnio, Rodríguez & Daly, 2009, and alvinocaridid shrimp, Alvinocaris komaii Zelnio & Hourdez, 2009. This invidual with palm of preserved left cheliped (regenerated?) bearing only a single dark spot is atypical such as many Austinograea species showing regenerated chelipeds; patches of setae discernible just above on inner surface of chela and on right subhepatic region. Photographies courtesy of C. R. Fisher (Penn State University, USA).

FIG. 5. — Austinograea hourdezi n in A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins

FIG. 5. — Austinograea hourdezi n. sp., paratype, ♂ 29.8 × 48.1 mm (left-handed, with weak heterochely and heterodonty), Lau Back-Arc Basin, TUIM06MV cruise, dive 142, Tow Cam site, MNHN-IU-2016-10738: A, dorsal view; B, frontal view; C, mxp3; D, ventral view; E, G, both chelae with two typical spots on outer surface; F, H, both chelae with patches of setae on inner surface: E, F, cutter situated at right; G, H, crusher situated at left.

FIGURE 1 in First zoeal stage of the Indian Ocean hydrothermal vent crab, Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Brachyura: Bythograeidae)

FIGURE 1. Map showing the study area along the Central and Southeast Indian Ridges in the Indian Ocean. Sampling locations indicated with stars and position of videos as dots.

FIGURE 2 in First zoeal stage of the Indian Ocean hydrothermal vent crab, Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Brachyura: Bythograeidae)

FIGURE 2. CLSM images of Austinograea rodriguezensis Tsuchida & Hashimoto, 2002, zoea I, SMF 61980: A, lateral view; B, dorsal view. Scale bars = 100 µm.

FIGURE 4 in First zoeal stage of the Indian Ocean hydrothermal vent crab, Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Brachyura: Bythograeidae)

FIGURE 4. CLSM images of Austinograea rodriguezensis Tsuchida & Hashimoto, 2002, zoea I, SMF 61980: A, maxillule; B, maxilla; C, first maxilliped; D, setation of first maxilliped coxal article; E, right second maxilliped; F, setation of the terminal endopodal article of the left second maxilliped. Scale bars = 50 µm.

FIGURE 3 in First zoeal stage of the Indian Ocean hydrothermal vent crab, Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Brachyura: Bythograeidae)

FIGURE 3. Drishti images of Austinograea rodriguezensis Tsuchida & Hashimoto, 2002, zoea I, SMF 61980: A, antennule; B, antenna; C, mandible, anterior view; D, mandible, posterior view. Scale bars = 100 µm.

FIGURE 6 in First zoeal stage of the Indian Ocean hydrothermal vent crab, Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Brachyura: Bythograeidae)

FIGURE 6. Austinograea rodriguezensis Tsuchida & Hashimoto, 2002, zoea I, dorsal view, SMF 61980: A, pleon, schematic illustration of pleomeres 3–5; B, telson. Scale bar = 100 µm.

FIGURE 14 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 14. CLSM images of Austinograea rodriguezensis, megalopa. A. pleon, dorsal view (SMF 57020); B. pleon, lateral view (SMF 57020); C. second pleopod (SMF 57021); D. third pleopod (SMF 57021); E. fourth pleopod (SMF 57021); F. fifth pleopod (SMF 57021); G. sixth pleopods (uropods) and telson, ventral view (SMF 57021). Scale bars = 0.1 mm.

FIGURE 12 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 12. CLSM images of Austinograea rodriguezensis, megalopa (SMF 57020). A. second maxilliped; B. first maxilliped; C. third maxilliped, arthrobranch gill detached. Scale bars = 0.2 mm.

FIGURE 13 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 13. CLSM images of Austinograea rodriguezensis, megalopa (SMF 57020). A. left chela, anterior view; B. right chela, posterior view; C. coxa of P1; D. second pereiopod; E. coxa of P2; F. third pereiopod; G. coxa of P3; H. fourth pereiopod; I. coxa of P4; J. fifth pereiopod; K. coxa of P5. Scale bars = 0.5 mm.

FIGURE 7. Austinograea rodriguezensis, megalopa. A in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 7. Austinograea rodriguezensis, megalopa. A. antennule with primary and accessory flagellum (SMF 57020); B. antennule, first article of the peduncle (SMF 57020); C. antenna (SMF 570219. Scale bars = 0.1 mm.

FIGURE 9 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 9. Austinograea rodriguezensis, megalopa (SMF 57020). A. maxilla, scaphognathite; B. same appendage as A, magnification of plumose setae; C. maxilla, coxal endites, basial endites and endopod. Scale bars = 0.1 mm.

FIGURE 6 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 6. CLSM images of Austinograea rodriguezensis, megalopa A. antenna (SMF 57021); B. fluorescence-labelled phalloidin antennal musculature (SMF 57022); C. detail of annulation on carpus with phalloidin stained musculature (SMF 57022). Scale bars = 100 µm.

FIGURE 2 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 2. Photograph of Kairei hydrothermal vent field, Central Indian Ridge, its associated biological communities, with special attention to Austinograea rodriguezensis. A. Near vent fluid effluents; B. Moderate distance from vent fluids.

FIGURE 5 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 5. CLSM images of Austinograea rodriguezensis, megalopa (SMF 57020). A. antennule; B. mandible; C. maxillule without coxal endite; D. maxillule; E. maxilla: coxal and basial endites and endopod; F. maxilla, scaphognathite. Scale bars = 0.1 mm. CLSM images of Austinograea rodriguezensis, megalopa A. antenna (SMF 57021); B. fluorescence-labelled phalloidin antennal musculature (SMF 57022); C. detail of annulation on carpus with phalloidin stained musculature (SMF 57022). Scale bars = 100 µm.

FIGURE 4 in The megalopal stage of the hydrothermal vent crab Austinograea rodriguezensis Tsuchida & Hashimoto, 2002 (Decapoda: Bythograeidae): a morphological description based on CLSM images

FIGURE 4. CLSM images of Austinograea rodriguezensis, megalopa. A. habitus dorsal (SMF 57021); B. habitus ventral (SMF 57021); C–E, cephalothorax without left eye, pleon and pereiopods (SMF 57020); C. dorsal view; D. ventral view; E.