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Fig 12 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 12. Kirkegaardia zafirae sp. nov. (A) anterior end, lateral view; (B) abdominal segments, lateral view; (C) neuropodial setae in posterior region; (D) notopodial setae in posterior region; (E) posterior parapodia, pre-pygidial region. A–E (MNRJP-003017). Scale bars: 100 μm (A-E). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Fine sediments, sand with biodebris, 26 to 43 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g012

Fig 10 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 10. Kirkegaardia papaveroi sp. nov. (A) Anterior end, lateral view; (B) notopodial capillary denticulated; (C) neuropodial capillary denticulated; (D) posterior end, dorsal view. https://doi.org/10.1371/journal.pone.0265336.g010

Fig 9 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 9. Kirkegaardia nupem sp. nov. (A) anterior end, dorsal view; (B) posterior end, lateral view; (C) posterior end with tube, ventral view; (D) notopodial setae in posterior region; (E) neuropodial setae in posterior region. A and B (MNRJP003003). Scale bars: 100 μm (A and B). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Sandy sediments with or without biodebris, 46 to 1010 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g009

Fig 7 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 7. Kirkegaardia jongo sp. nov. (A) anterior end, dorsal view; (B) posterior end, lateral view; (C) denticulated notopodial capillary; (D) denticulated neuropodial capillary. A–B (MNRJP-002997). Scale bars: 100 μm (A and B). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Fine sediments composed of silt and clay, or sand, depth between 352 to 1288m. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g007

Fig 11 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 11. Kirkegaardia papaveroi sp. nov. (A) Anterior end, lateral view; (B) abdominal segments, dorsal view. A and B (MNRJP-003008). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Sandy sediments, 14 and 145 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g011

Fig 5 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 5. Kirkegaardia goytaca sp. nov. (A) anterior end, dorsal view; (B) notopodial capillary denticulated; (C) neuropodial capillary denticulated. A–C (MNRJP-002990). Scale bars; 200 μm (A-C). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Fine sediments (clay) and sandy sediments organically enriched, 21 and 43 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g005

Fig 2 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 2. Kirkegaardia hampsoni. (A) anterior end, dorsal view; (B) segments of the anterior abdominal region; (C) segments of the posterior abdominal region; (D) notopodial setae in posterior region; (E) neuropodial capillary denticulated. A–C (MNRJP-002966). Scale bars: 100 μm (A–C). Type locality. Atlantic Ocean: Massachusetts (USA) [27]. Habitat. Fine sediments, 30–150 m depth [27]. In the present study, fine sediments, mainly silt/clay, 19–683 m depth. Distribution. Atlantic Ocean: Massachusetts (USA) [27]; Campos Basin (Brazil). https://doi.org/10.1371/journal.pone.0265336.g002

Fig 3 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 3. Kirkegaardia blakei sp. nov. (A) anterior end, dorsal view; (B) posterior parapodium, anterior view; (C) notopodial seta with long curved tips; (D) neuropodial denticulated capillary; (E) posterior end, dorsal view. A–E, (MNRJP-002971). Scale bars: 100 μm (A and E); 200 μm (B–D). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Sandy sediments, 38 and 683 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g003

Fig 1 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 1. Study area, Campos Basin, Brazil. Sampling stations are represented by coloured dots. https://doi.org/10.1371/journal.pone.0265336.g001

Fig 4 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 4. Kirkegaardia brisae sp. nov. (A) anterior end, dorsal view; (B) abdominal segments, lateral view; (C) notopodial capillary denticulated; (D) neuropodial capillary denticulated; (E) posterior end, dorsal view. A–E (MNRJP-002974). Scale bars: 100 μm (A B and E); 10 μm (C-D). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Frequent in sandy sediments, rarer in muddy or sediments with gravels and rhodoliths, 14 to 352 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, stain not retained. https://doi.org/10.1371/journal.pone.0265336.g004

Fig 8 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 8. Kirkegaardia medusa sp. nov. (A) anterior end, dorsal view; (B) abdominal segments, lateral view; (C) posterior abdominal segments, lateral view; (D) notopodial capillary with fibrils in abdominal region (E) neuropodial capillary denticulated. B–C (MNRJP-003000). Scale bars: 2 mm (B and C). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Fine sediments composed of silt and clay, between 41 to 352 m deep. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. No pattern, but prominent staining on the thoracic region. https://doi.org/10.1371/journal.pone.0265336.g008

Fig 6 in Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species

Fig 6. Kirkegaardia helenae sp. nov. (A) anterior end, dorsal view; (B) neuropodial capillary denticulated; (C) notopodial capillary denticulated; (D) capillaries in thoracic setigers with fibrils; (E) abdominal segments, dorsal view; (F) posterior end, lateral view. A–C (MNRJP-002992). Scale bars: 100 μm (A) 200 μm (B and C). Type locality. Atlantic Ocean: Campos Basin (Brazil). Habitat. Thin silt and clay sediments, 14 to 349 m depth. Distribution. Presently known only from Atlantic Ocean: Campos Basin (Brazil). Methyl Green. Parapodia with stain concentrated on posterior borders of noto- and neuropodia along entire body. https://doi.org/10.1371/journal.pone.0265336.g006

FIGURE 35. Kirkegaardia olgahartmanae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 35. Kirkegaardia olgahartmanae n. sp. A–D, Photomicrographs: A, Lateral view of entire worm; B, same specimen, anterior end in detail; C, same specimen, posterior end in detail; D, specimen stained with Methyl Green.—E–G, SEMs: E, anterior abdominal parapodium showing noto- and neurosetal fascicles; F, denticulated neurosetae (seta on left with broken tip), G, detail of another neurosetae detail of denticles along cutting edge of blade. A–C, specimen from ANDEEP Sta. 152 (ZMH P-27819), stained with Shirlastain A; D, specimen from Sta. MIC-55 (ZMH P-27816), stained with Methyl Green; E–G, specimen from Sta. ANDEEP III Sta. 152 (SEM, JAB).

FIGURE 34. Kirkegaardia olgahartmanae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 34. Kirkegaardia olgahartmanae n. sp., A. anterior end, dorsal view; B, anterior end, right lateral view; C, same specimen, posterior end; D, posterior end, right lateral view; E–F, serrated neurosetae from abdominal setiger. A, D, holotype (LACM-AHF Poly 8939); B–C, E–F, BIC Sta. 55 (ZMH P-27816).

FIGURE 32. Kirkegaardia brigitteae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 32. Kirkegaardia brigitteae n. sp., paratypes, EASIZ II Sta.48-132, (ZMH P-27810): A, anterior end, dorsal view; B, anterior end in right lateral view of another paratype, C, anterior abdominal segments, left lateral view; D, posterior end, dorsal view; E, denticulate neuroseta from middle abdominal segment with inset (not to scale).

FIGURE 33. Kirkegaardia brigitteae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 33. Kirkegaardia brigitteae n. sp., photomicrographs of methyl green staining pattern of paratypes, EASIZ Sta. 48- 131 (ZMH P-27809): A, anterior end, dorsolateral view; B, anterior end, dorsolateral view; C, anterior end, dorsal view; D, middle abdominal segments, ventral view.—Scanning electron micrographs of denticulated setae from specimen from ANDEEP III Sta. 150-8: E, denticulated neurosetae from anterior abdominal segment; F, details of one denticulated neuroseta; G, denticulated notosetae from an anterior abdominal segment.

FIGURE 36. Kirkegaardia olgahartmanae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 36. Kirkegaardia olgahartmanae n. sp. Mud ball habitat at ANDEEP III Sta. 152 in the Bransfield Strait, Antarctica: A–B, planview 35-mm images taken 0.8 m above the seafloor.—C–F, sediment profile 35 mm images: C, 15 cm wide image, showing upper 4.5 cm and mud balls on the surface; D–F, separate images edited to show individual mud balls. Images courtesy of Dr. Robert J. Diaz.

FIGURE 31. Kirkegaardia heroae n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 31. Kirkegaardia heroae n. sp., holotype (USNM 1013894): A, anterior end, dorsal view; B, same, with more detail; C–D, abdominal neurosetae.

FIGURE 30. Kirkegaardia jumarsi n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 30. Kirkegaardia jumarsi n. sp., holotype (USNM 1407135): A, anterior end, dorsal view; B, same, left lateral view; C, abdominal setigers 9–11 in left lateral view; D, abdominal setigers 12–19 in dorsal view; E, abdominal denticulated neuroseta, inset not to scale.

FIGURE 29. Kirkegaardia chilensis n in Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

FIGURE 29. Kirkegaardia chilensis n. sp., holotype (USNM 1013897): A, anterior end, right lateral view; B, anterior end, dorsal view; C–D, abdominal denticulated neurosetae.