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Fig. 1 in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 1. Trajectory of the R/V Dr Fridtjof Nansen during the cruise SEAFO-2015 (in red) and the seamounts where hydroids were collected (in green).

Fig. 2. A–E in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 2. A–E. Amphinema biscayana (Browne, 1907). A. Colony. B. Cross-section of the main stem. C. Part of branch with polyps. D. Part of branch with polyp and medusa bud. E. Part of main stem with polyp. — F. Filellum sp., several hydrothecae.

Fig. 8 in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 8. Monotheca bergstadi sp. nov. A. Portion of colony with hydrocladia. B. Part of colony with hydrocladium and gonothecae. C. Detail of hydrocladia and gonotheca.

Fig. 5 in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 5. Monostaechoides providentiae (Jarvis, 1922) gen. et comb. nov., stn PT4. A–C. Three distinct colonies showing their distinctive ramification. D. Detail of hydrotheca, frontal view. E. Detail of hydrocladia with hydrothecae, lateral view. F–G. Details of the basal part of several hydrocladia.

Fig. 4. A in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 4. A. Clytia gigantea (Hincks, 1866), portion of colony with three hydrothecae. B. Amphisbetia minima (Thompson, 1879), portion of hydrocladia with hydrothecae and basal gonotheca. C. Sertularella areyi Nutting, 1904, part of hydrocladia with hydrothecae. D. Sertularella polyzonias (Linnaeus, 1758), part of hydrocladia with hydrotheca and one gonotheca. E. Sertularella patagonica (d' Orbigny, 1846), part of hydrocladia with hydrothecae.

Fig. 3. A–C in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 3. A–C. Zygophylax sp. A. Colony. B. Distal part of colony with hydrocladia. C. Part of hydrocladia with two hydrothecae. — D–E. Stegopoma giganteum Ramil & Vervoort, 1992. D. Hydrotheca on pedicel. E. Gonotheca. — F. Campanulina denticulata Clarke, 1907, part of colony ramified with hydrothecae. — G–H. Campanularia africana Stechow, 1923, detail of hydrotheca, lateral view.

Fig. 7. A–B in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 7. A–B. Monostaechoides providentiae (Jarvis, 1922) gen. et comb. nov. A. Stn PT4, detail of basal part of hydrocladia. B. Stn BT5, part of hydrocladium with hydrothecae and a male gonotheca. C–D. Monotheca bergstadi sp. nov. C. Hydrocladia ramified and with gonothecae. D. Detail of hydrotheca, lateral view.

Fig. 6 in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 6. Monostaechoides providentiae (Jarvis, 1922) gen. et comb. nov., stn PT4. A. Part of colony with hydrocladia, and male and female gonothecae. B. Detail of hydrocladia with hydrothecae and two female gonothecae, lateral view. C. Part of hydrocladia, lateral view. D. Portion of hydrocladia with two consecutives ramifications.

Fig. 9 in Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

Fig. 9. Vema Seamount summit. Images obtained from video footage taken during the cruise of the R/V Dr Fridtjof Nansen in the SE Atlantic. A. Dive 4 (95–91 m depth). B. Dive 5 (91–42 m depth). C–D. Dive 6 (72–43 m).

FIG. 7. — Plumularia contraria n in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 7. — Plumularia contraria n. sp., MUSORSTOM 4; A, B, stn CP 178 (holotype): A, basal internodes, lateral view; B, apophyse and first internode; C, stn CP 172 (paratype), branch. Scale bars: 0.1 mm.

FIG. 19 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 19. — Plumularia elongata Billard, 1913, syntypes of Plumularia habereri var. mediolineata Billard, 1913; SIBOGA EXPEDITION stn 71: A, B, MNHN H.L. 1270: A, basal internodes; B, internode of distal part of hydrocladia lateral view; C, MNHN H.L. 1271, distal internode of hydrocladia, frontal view. Scale bars: 0.1 mm.

FIG. 13 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 13. — Plumularia habereri Stechow,1909, syntype of Plumularia habereri var. mucronata Billard,1913; SIBOGA EXPEDITION,stn 80, MNHN H.L. 1272, internodes, lateral view. Scale bar: 0.1 mm.

FIG. 27 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 27. — Polyplumaria cornuta (Bale, 1884): A, LAGON, stn 0615, colony; B-E, LAGON, stn 0745: B, first internodes of hydrocladia and one modified hydrocladia on apophyses; C-E, internodes, lateral view. Scale bars: A, 1 cm; B-E, 0.1 mm.

FIG. 23 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 23. — Plumularia spiralis Billard, 1911, BENTHEDI, stn CH 13: A, colony; B, internode, lateral view; C, apophyses and first internode of hydrocladia; D, internode, lateral view. Scale bars: A, 1 cm; B-D, 0.1 mm.

FIG. 16 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 16. — Plumularia elongata Billard, 1913, MUSORSTOM 3, stn CP 134, fragment with basal part of branchs. Scale bar: 0.1 mm.

FIG. 14 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 14. — Dentitheca hertwigi (Stechow,1909), type material,ZSM 20041700:A, first internodes of hydrocladia,lateral view; B, internodes from half of hydrocladia, lateral view; C, distal internodes of hydrocladia, lateral view; D, internode, frontal view. Scale bars: 0.1 mm.

FIG. 6. — Plumularia contraria n in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 6. — Plumularia contraria n. sp., MUSORSTOM 4; A, stn CP 172 (paratype), colony; B-E, stn CP 178 (holotype): B, C, internodes, frontal view; D, first internode of hydrocladia,lateral view; E, last internode of hydrocladia, lateral view. Scale bars: A, 1 cm; B-E, 0.1 mm.

FIG. 4 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 4. — Cladacanthella scabra (Lamarck, 1816), MUSORSTOM 3, stn CP 142: A, B, anomalous hydrocladia; C, spines of basal part of branch; D, spines from distal part of branch. Scale bars: 0.1 mm.

FIG. 5. — Plumularia bathyalis n in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 5. — Plumularia bathyalis n. sp., BIOGEOCAL, stn DW 313 (holotype): A, colony; B, stem; C, basal internodes of hydrocladia; D, distal internodes of hydrocladia, lateral view; E, internodes, frontal view. Scale bars: A, 1 cm; B-E, 0.1 mm.

FIG. 18 in Hydroids of the families Kirchenpaueriidae Stechow, 1921 and Plumulariidae McCrady, 1859 (Cnidaria, Hydrozoa) collected in the Western Pacific Ocean by various French Expeditions

FIG. 18. — Plumularia elongata Billard, 1913, syntype of Plumularia habereri var.subarmata Billard,1913;SIBOGA EXPEDITION stn 99, MNHN H.L. 1273, internodes, lateral view. Scale bar: 0.1 mm.