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FIGURE 3. Idanthyrsus mikeli n in Sabellariids (Annelida: Sedentaria: Sabellariidae) from shallow waters of the Gulf of Mexico and the Caribbean Sea, including three new species

FIGURE 3. Idanthyrsus mikeli n. sp. (ECOSUR-252). A, Holotype complete specimen, lateral view. B, Anterior region, ventral view. C, Anterior region, dorsal view. D, Median ridge and median organ, ventral view. E, Parathoracic region, lateral view. F, Abdomen, ventral view. Scale bars: A–C: 1 mm; D–F: 0.5 mm. Abbreviations: ab8, abdominal neuropodia segment 8; bo, building organ; ca, cauda; mo, median organ; mr, median ridge; ne, parathoracic neuropodia; no, parathoracic notopodia; pa, palps; tf, tentacular filaments.

FIGURE 1. Idanthyrsus bastidai n in Sabellariids (Annelida: Sedentaria: Sabellariidae) from shallow waters of the Gulf of Mexico and the Caribbean Sea, including three new species

FIGURE 1. Idanthyrsus bastidai n. sp. (ECOSUR-250). A, Holotype complete specimen. B, Anterior region, dorsal view. C, Anterior region, lateral view. D, Thorax and parathorax, lateral view. E, Opercular peduncle, ventral view. F, Abdominal region, ventral view. Scale bars: A–C: 1 mm, D–F: 0.5 mm. Abbreviations: ab8, abdominal neuropodia segment 8; bo, building organ; cn1, cirrus neuropodia segment 1; ll2, lateral lamellae segment 2; mo, median organ; mr, median ridge; ne, parathoracic neuropodia; no, parathoracic notopodia; tf, tentacular filaments.

FIGURE 7 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 7. Crella (Pytheas) santacruzae Fernandez, Gastaldi, Thompson & Hajdu, sp. nov.: skeleton (A–F) and spicules (G–S, in SEM and light microscopy) of the holotype―ZIN 12081 (A, D–E, G–N) and paratype―ZIN 12082 (B–C, F, O–S). A, transverse section. B, transverse section. C, transverse section (another section). D, tornotes in bouquet and ectosomal acanthostyles scattered and making a continuous layer at the ectosomal region. E, bouquet of tornotes and ectosomal acanthostyles. F, tornotes in bundles and ectosomal acanthostyles at the ectosomal region. G, tornotes (strongyle-like shape). H, extremities of the tornotes. I, tornotes (in light microscopy). J, extremities of the tornotes with slightly rough appearance due to very small spines. K, choanosomal acanthostyles. L, choanosomal and ectosomal acanthostyles (in light microscopy). M, ectosomal acanthostyles. N, arcuate isochelae. O, tornotes (strongyles-like shape) and ectosomal acanthostyles. P, extremities of the tornotes. Q, choanosomal acanthostyles (in light microscopy). R, ectosomal acanthostyles. S, arcuate isochelae. Scale bars: A = 500 µm; B–C = 200 µm; D–G = 100 µm; H = 10 µm; I= 100 µm; J = 10 µm; K–L = 100; M = 50 µm; N = 20 µm; O = 100 µm; P = 10 µm; Q = 100 µm; R = 50 µm; S = 20 µm.

FIGURE 9 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 9. Crellomima sigmatifera Fernandez, Gastaldi & Hajdu, sp. nov.: skeleton (A–F) and spicules (G–N, in SEM) of the holotype―IZUA-POR 172. A, transverse section. B, tornotes in vertical arrangement at the subectosomal region. C, tornotes in bouquets at the ectosomal region. C, ectosomal layer of ectosomal acanthostyles. D, detail of the ectosomal layer with ectosomal acanthostyles. E, choanosomal reticulation of choanosomal acanthostyles I equinated by choanosomal acanthostyles II. F, choanosomal acanthostyles I and II echinating a basal plate of spongin, which covers debris. G, tornotes. H, extremities of the tornotes. I, choanosomal acanthostyles I. J, choanosomal acanthostyle II. K, ectosomal acanthostyles. L, anchorate isochelae I. M, anchorate isochelae II. N, sigmas. Scale bars: A = 500 µm; B–D = 50 µm; E = 250 µm; F = 100 µm; G = 50 µm; H = 5 µm; I–J = 50 µm; K–L = 25 µm; M = 5 µm; N = 25 µm.

FIGURE 8 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 8. Crellomima sigmatifera Fernandez, Gastaldi & Hajdu, sp. nov.: type material preserved (A–B). A, encrusting specimen (holotype―IZUA-POR 172) over shell of a barnacle, in preservative (ethanol 70%). B, surface and part of the choanosomal region of the holotype (e. = ectosome, and c. = choanosome). Scale bars: A = 5 mm; B = 0.5 mm.

FIGURE 6 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 6. Crella (Pytheas) santacruzae Fernandez, Gastaldi, Thompson & Hajdu, sp. nov.: type material preserved (A–D). A, massive fragment (MNRJ 22479) of the holotype―ZIN 12081 in preservative (ethanol 70%). B, Same fragment of holotype turned over. C, massive fragment (MNRJ 22438) of the paratype―ZIN 12082 in preservative (ethanol 70%). D, Same fragment of paratype turned over. Scale bars: A–D = 5 mm.

FIGURE 1 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 1. Map of collection points. A, southern South America and arrow pointing to 1—off Santa Cruz province, Argentina Sea. B, Desventuradas Archipelago and arrow pointing to 2—San Ambrosio Island. C, Chiloé Island and Corcovado Gulf showing zoomed out to D (arrows ponting to 3—Puñihuil, Cocotue bay, 4—Duahatao and 5—Metalqui Island) and zoomed in to E (arrow pointing to 6—Rada Negra, Palvitad fjord). Scale bars: A = 500 km; B = 10 km; C = 20 km; D–E = 5km. Map from Google Earth.

FIGURE 5 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 5. Crella (Pytheas) desventuradae Fernandez, Gastaldi, Zapata-Hernández & Hajdu, sp. nov.: skeleton (A–F) and spicules (G–M, in SEM and light microscopy) of the holotype―MNHNCL POR-15019. A, transverse section. B, ectosomal region. C, detail of a spongin fiber at the subectosomal region with ectosomal acanthostyles (iii) and tract of tornotes (t) inside it. D, Ectosomal and subectosomal regions with ectosomal acanthostyles. E, choanosomal region with mesh of spongin fibers echinated by choanosomal acanthostyles I and II. F, detail of a spongin fiber echinated by choanosomal acanthostyles I (i) and II (ii) and with ectosomal acanthostyles (iii) inside it. G, spiculation showing choanosomal acanthostyles I (i) and II (ii), ecotosomal acanthostyles (iii), tornotes (t) and arcuate isochelae (a). H, extremities of a tornotes; I, choanosomal acanthostyles I; J, choanosomal acanthostyles II. K, ectosomal acanthostyles. L, acanthoxeas (in light microscopy). M, arcuate isochelae. Scale bars: A = 500 µm; B–D= 50 µm; E =200 µm; F = 50 µm; G = 50 µm; H = 1 µm; I–K = 10 µm; L = 20 µm; M = 2 µm.

FIGURE 2 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 2. Crella (Pytheas) chiloensis Fernandez, Gastaldi, Pardo & Hajdu, sp. nov.: type material in life and preserved (A–F). A, massive specimen in life (holotype—IZUA-POR 170). B, another massive specimen in life (paratype—MNRJ 16989). C–F, holotype in preservative (ethanol 70%) showing whole body (C), a membrane at the surface (indicated by arrow) (D), small oscules (indicated by arrow) (E) and pore sieves (F). Scale bars: A–C= 1 cm; D–E = 1 mm; F = 0.5 mm.

FIGURE 4 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 4. Crella (Pytheas) desventuradae Fernandez, Gastaldi, Zapata-Hernández & Hajdu, sp. nov.: type material in life and preserved (A–F). A, massive specimen in life (holotype—MNHNCL POR-15019). B, detail of the surface of the specimen in life with oscules and subectosomal channels. C–F, holotype in preservative (ethanol 70%) showing a cavernous choanosome (fragment of the holotype—MNRJ 19228) and a membrane at the surface (C, indicated by arrow), an oscule partially covered by the membrane (D), pore sieves (E) and a pore sieve in detail (F). Scale bars: A = 5 cm; B–C = 1 cm; D = 2 mm; E = 1 mm; F = 0.5 mm.

FIGURE 3 in New species of Crella (Pytheas) Topsent, 1890 and Crellomima Rezvoi, 1925 (Crellidae, Poecilosclerida, Demospongiae) from Chilean shallow and Argentinean deep waters, with a synthesis on the known phylogenetic relationships of crellid sponges

FIGURE 3. Crella (Pytheas) chiloensis Fernandez, Gastaldi, Pardo & Hajdu, sp. nov.: skeleton of the holotype―IZUA- POR 170 (A–D) and spicules of the holotype (E–J, in SEM) and paratype―MNRJ 16989 (K–P, in SEM). A, transverse section. B, ectosomal region with bundles of tornotes and choanosomal region with tracts of tornotes echinated by choanosomal acanthostyles I and II. C, detail of the ectosomal region with tornotes disposed in a perpendicular arrangement and ectosomal acanthostyles scattered. D, choanosomal acanthostyles I and II echinating the base of the skeleton and a spongin fiber, and a few ectosomal acanthostyles scattered. E, tornotes. F, extremities of the tornotes. G, choanosomal acanthostyles I. H, choanosomal acanthostyles II. I, ectosomal acanthostyles and acanthoxeas (in right). J, arcuate isochelae. K, tornotes. L, extremities of the tornotes. M, choanosomal acanthostyles I. N, choanosomal acanthostyles II. O, ectosomal acanthostyles III. P, arcuate isochelae. Scale bars: A = 500 µm; B = 150 µm; C–D = 50 µm; E = 20 µm; F = 5 µm; G–I = 20 µm; J = 5 µm; K = 20 µm; L= 5 µm; M–O = 20 µm; P = 5 µm.

FIGURE 15 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 15. Tropicoecetes carinata gen. et sp. nov. Holotype, 3, except F, paratype, Ƥ. gp1 and gp2, gnathopods 1 and 2; md plp, mandible palp; mx1 and mx2, maxilla 1 and 2; p4 and p6, pereopods 4 and 6.

FIGURE 18 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 18. Rhinoecetes anneae gen. et sp. nov. A, abode aggregate of paratype male in scaphopod and 2 paratype females in microprosobrancs, (type locality). B, paratype, 3B, (type locality).

FIGURE 16 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 16. Rhinoecetes anneae gen. et sp. nov. Holotype, 3, except F, paratype Ƥ. a2 flag, antenna 2 flagellum; c dv and c lv, head dorsal and lateral view; up1 vv, uropod 1 ventral view; us, urosome. Habitus scale: 1 mm.

FIGURE 17 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 17.Rhinoecetes anneae gen. et sp. nov. Holotype 3, except F, paratype Ƥ. gp1 and gp2, gnathopods 1 and 2; md plp, mandible palp; p3 and p5, pereopods 3 and 5; sp, sternal papillae (6 and 7, pereonites 6 and 7); vp, ventral projection of article 2 of antenna 2.

FIGURE 12 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 12. Belkginoecetes bullockyensis gen. et sp. nov. Holotype, 3, except ab, paratype in abode. a2 flag, antenna 2 flagellum; c dv and c lv, head dorsal and lateral view; vp, ventral projection of article 2 of antenna 2. Habitus scale: 1 mm; abode scale: 2 mm.

FIGURE 5 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 5. Belkginoecetes springthorpei gen. et sp. nov. Holotype, 3, except F, paratype, ovigerous Ƥ. gp1 and gp2, gnathopods 1 and 2; md plp, mandible palp; p3 and p5, pereopods 3 and 5; sp, sternal papillum (right lateral view); us, urosome; 6 and 7, pereonites 6 and 7.

FIGURE 10 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 10. Belkginoecetes darwiniense gen. et sp. nov. Holotype, 3, except M, paratype 3 and F, paratype Ƥ. a2 flag, antenna 2 flagellum; c dv and c lc, head dorsal and lateral view; md plp, mandible palp; us, urosome. Habitus scale: 1 mm.

FIGURE 14 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 14. Tropicoecetes carinata gen. et sp. nov. Holotype, 3, except F, paratype, Ƥ. c dv and c lv, head dorsal and lateral view; us, urosome; vp, ventral projection of article 2 of antenna 2. Habitus scale: 1 mm.

FIGURE 4 in Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 10: Belkginoecetes gen. nov., Tropicoecetes gen. nov. and Rhinoecetes Just, 1983 from north-eastern and northern Australian shallow water, with eight new species

FIGURE 4. Belkginoecetes springthorpei gen. et sp. nov. Holotype 3, except F, paratype Ƥ. a2 flag, antenna 2 flagellum; c dv and c lv, head dorsal and lateral views; tel, telson; up3, uropod 3; us lv, urosome lateral view; vp, ventral projection of article 2 of antenna 2. Habitus scale: 1 mm.