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FIGURE 5. Olivancillaria urceus. A in A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic

FIGURE 5. Olivancillaria urceus. A, radula, frontal view, scale bar = 100 µm, B, detail of rachidian teeth scale bar = 50 µm; C, penis, scale bar = 200 µm; D, siphon, scale bar = 500 µm; E, ultrastructure of the shell, scale bar = 200 µm.

FIGURE 4 in A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic

FIGURE 4. Olivancillaria urceus (Röding, 1798). A–B, MACN-In 38158 from Mar del Plata, Buenos Aires province, Argentina; C–D, MACN-In 38159 from Prainha Branca, São Paulo, Brazil; E–F, illustration of Oliva brasiliensis from plate 147, figures 1367–1368 of Chemnitz (1788); G–H, MACN-In 38157 from Mar del Plata, Buenos Aires province, Argentina; I, Voluta pinguis Solander, 1786, probable syntype NHMUK 506 from "Brazil". Scale bar = 1 cm. bf: basal fold; cc: columellar callus; cf: columellar folds; fb: fasciolar band; g: fasciolar groove; sc: siphonal channel.

FIGURE 9. A in A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic

FIGURE 9. A, radula of O. contortuplicata, frontal view, scale bar = 100 µm; B, ultrastructure of the shell, scale bar = 80 µm; C, penis, scale bar = 500 µm; D, siphon, scale bar = 2 mm; E, radula of O. teaguei, frontal view, scale bar = 50 µm; F, ultrastructure of the shell, scale bar = 200 µm.

FIGURE 8. A–C in A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic

FIGURE 8. A–C, Olivancillaria teaguei Klappenbach, 1964, holotype MNHNM 1238, from La Coronilla, Rocha department, Uruguay; D–E, Olivancillaria teaguei from Uruguay; F–H, Olivancillaria contortuplicata (Reeve, 1850) holotype NHMUK 20100471 Senegal in error. Scale bar = 1 cm.

FIGURE 10 in A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic

FIGURE 10. Olivancillaria deshayesiana (Ducros de Saint Germain, 1857). A–C, from Mar del Plata, Buenos Aires province, Argentina; D–E, holotype of Oliva ovata NML 17.6.1875; F–G, lectotype of Oliva deshayesiana MNHN unnumbered, scale bars = 1 cm.

FIGURE 1. Plesionika revizeei n in New species of Plesionika Bate, 1888 (Crustacea, Decapoda, Pandalidae) from Southwestern Atlantic

FIGURE 1. Plesionika revizeei n. sp., ovigerous female (16 mm), MNRJ 14663. A. lateral view (as - antennal spine; ps-pterygostomian spine); B. right antennular peduncle, ventral view (st-stylocerite); C. right antennal scale, ventral view; D. left basis and epipods of maxilliped 3 and pereopods 1–5, lateral view (Mxp-maxilliped; P-pereopod).

FIGURE 2. Plesionika revizeei n in New species of Plesionika Bate, 1888 (Crustacea, Decapoda, Pandalidae) from Southwestern Atlantic

FIGURE 2. Plesionika revizeei n. sp., male (14.4 mm), MNRJ 21509. A. abdominal somites 3–5, dorsal view; B. abdominal somites 3–5, lateral view. Ovigerous female (16 mm), MNRJ 14663. C. left pereopod 2, dorsal view; D. right pereopod 2, dorsal view. Male (14.4 mm), MNRJ 21509. E. left pereopod 3, propod and dactyl; F. left pereopod 3, dactyl.

FIGURE 4 in New species of Plesionika Bate, 1888 (Crustacea, Decapoda, Pandalidae) from Southwestern Atlantic

FIGURE 4. Plesionika willisi (Pequegnat, 1970), allotype, male (14.5 mm), USNM 128803. A. Carapace, lateral view (asantennal spine; ps-pterygostomian spine). Female (10.9 mm), USNM 282666. B. right antennular peduncle, ventral view (ststylocerite); C. right antennal scale, ventral view. Allotype, male (14.5 mm), USNM 128803. D. abdominal somites 3–5, dorsal view. E. abdominal somites 2–6, lateral view. Paratype, male (10.6 mm), USNM 128804. F. telson and uropods, dorsal view.

FIGURE 3. Plesionika revizeei n in New species of Plesionika Bate, 1888 (Crustacea, Decapoda, Pandalidae) from Southwestern Atlantic

FIGURE 3. Plesionika revizeei n. sp., ovigerous female (16 mm), MNRJ 14663. A. telson and uropods, dorsal view. Male (14.4 mm), MNRJ 21509. B. right endopod of first pleopod, lateral view; C. right appendix masculina and interna of second pleopod, lateral view. Ovigerous female (16 mm), MNRJ 14663. D. right endopod of first pleopod, lateral view; E. appendix interna of second pleopod, lateral view.

FIGURE 3. P5 dactylus. A‒C, Chaceon linsi n in A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae)

FIGURE 3. P5 dactylus. A‒C, Chaceon linsi n.sp., male holotype cl 136 mm, cw 149 mm (MZUSP 22287). D‒F, Chaceon fenneri (Manning & Holthuis, 1984), male paratype cl 130 mm, cw 161 mm (USNM 71004). G‒I, Chaceon quinquedens (Smith, 1879), male cl 105 mm, cw 129 mm (USNM 185424). J‒M, Chaceon sanctaehelenae Manning & Holthuis, 1989, male holotype cl 112 mm, cw 134 mm (USNM 125510). A, D, G, J dorsal views; B, E, H, L ventral views; C, F, I, M lateral views. Scale bars: A‒C, 30 mm; D‒F, 20 mm; G ‒M, 10mm.

FIGURE 4. P5 dactylus terminal corneous ridges. A, D, F, Chaceon linsi n in A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae)

FIGURE 4. P5 dactylus terminal corneous ridges. A, D, F, Chaceon linsi n.sp., male holotype cl 136 mm, cw 149 mm (MZUSP 22287). B, E, G, Chaceon sanctaehelenae Manning & Holthuis, 1989, male holotype cl 112 mm, cw 134 mm (USNM 125510). C, H, Chaceon fenneri (Manning & Holthuis, 1984), female paratype cl 90 mm, cw 113mm (USNM 71003). Scale bars: A, D, 6 mm; B, 3.8 mm; C, 4.3 mm; E, 3.2 mm; F, 12 mm; G, 10 mm; H, 11. 5 mm.

FIGURE 2. Habitus, dorsal view. A, Chaceon linsi n in A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae)

FIGURE 2. Habitus, dorsal view. A, Chaceon linsi n.sp., male holotype cl 136 mm, cw 149 mm (MZUSP 22287). B, Chaceon fenneri (Manning & Holthuis, 1984), male paratype cl 130 mm, cw 161 mm (USNM 71004). Scale bars: A, 30 mm; B, 50 mm.

FIGURE 1 in A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae)

FIGURE 1. Relative size of P5 merus, dorsal view. A, Chaceon linsi n.sp., male holotype cl 136 mm, cw 149 mm (MZUSP 22287). B, Chaceon fenneri (Manning & Holthuis, 1984), male paratype cl 130 mm, cw 161 mm (USNM 71004). C, Chaceon ramosae Manning, Tavares & Albuquerque, 1999, male paratype cl 141 mm, cw 157 mm (MZUSP 9363). D, Chaceon notialis Manning & Holthuis, 1989, male holotype cl 95 mm, cw 104 mm (USNM 205701). In A and C the distal end of the P5 meri extend far beyond the tip of the last anterolateral tooth of the carapace. Scale bars: A, 30 mm, B‒D, 50 mm.

FIGURE 5 in A new species of Chaceon Manning & Holthuis, 1989, from the southwestern Atlantic, with a key to the western Atlantic species (Crustacea, Decapoda, Geryonidae)

FIGURE 5. Relative size of P5 merus, dorsal view. A, Chaceon sanctaehelenae Manning & Holthuis, 1989, male holotype cl 112 mm, cw 134 mm (USNM 125510). B, Chaceon inghami (Manning & Holthuis, 1986) male paratype cl 58 mm, cw 82 mm (USNM 205336). C, Chaceon quinquedens (Smith, 1879), male syntype cl 44 mm, cw 58 mm (USNM 4000). D, Chaceon eldorado Manning & Holthuis, 1989, male holotype cl 89 mm, cw 109 mm (USNM 205982). Scale bars: A, D 50 mm; B, C 20 mm.

FIGURE 9 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 9. Ambidexter symmetricus Manning & Chace, 1971, male (CL=4.2 mm) (MZUESC 1110), Tanque Island, Maraú, state of Bahia, Brazil. (A) head and cephalic appendages, dorsal view; (B) head and cephalic appendages, lateral view; (C) right third maxilliped, lateral view; (D) right pereiopod 1, lateral view; (E) left pereiopod 1, lateral view. Scale bars: A–C = 1 mm; D, E = 0.5 mm.

FIGURE 8 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 8. Synalpheus ul (Ríos & Duffy, 2007), male (CL=4.7 mm) (MZUESC 709), Camamu Bay, state of Bahia, Brazil. (A) right pereiopod 2, lateral view; (B) right pereiopod 3, lateral view; (C) right pereiopod 3, distal portion, lateral view; (D) right pereiopod 4, lateral view; (E) right pereiopod 4, distal portion, lateral view; (F) right pereiopod 5, lateral view; (G) right pereiopod 5, distal portion, lateral view. Scale bars: A, B, D, F = 1 mm; C, E, G = 0.5 mm.

FIGURE 5 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 5. (A–D) Leptalpheus aff. forceps Williams, 1965, young male (CL=2.7 mm) (MZUESC 1240), Patipe River, Canavieiras, state of Bahia, Brazil. (A) head and cephalic appendages, dorsal view; (B) head and cephalic appendages, lateral view; (C) left major chela, ventral view; (D) left major chela, lateral view. (E–G) Leptalpheus forceps Williams, 1965, male (E, F) and ovigerous female (G) (CL not measured) (MNHN-Na-15682), Fort Pierce, Florida, USA. (A) head and cephalic appendages, dorsal view; (B) head and cephalic appendages, lateral view; (C) major chela, lateral view. Scale bars: A, B, E, F = 1 mm; C, D = 0.5 mm.

FIGURE 2 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 2. Alpheid shrimps from southern Bahia, Brazil. (A) Alpheus bouvieri A. Milne-Edwards, 1878, male from Cachoeira River, Maramata Beach, Ilhéus. (B) Alpheus cristulifrons Rathbun, 1900, ovigerous female from Tassimirim Beach, Cairú. (C) Alpheus formosus Gibbes, 1850, male from Tassimirim Beach, Cairú. (D) Alpheus cf. paracrinitus Miers, 1881, male from Taipus de Fora Beach, Maraú. (E) Alpheus cf. rostratus W. Kim & Abele, 1988, ovigerous female from Taipus de Fora Beach, Maraú. (F) Salmoneus carvachoi Anker, 2007, two ovigerous individuals from Maraú River, Maraú.

FIGURE 3 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 3. Automate cf. evermanni Rathbun, 1901, female (CL=3.3 mm) (MZUESC 1063), Cumuruxatiba Beach, Prado, state of Bahia, Brazil. (A) head and cephalic appendages, dorsal view; (B) head and cephalic appendages, lateral view. Scale bars: A = 0.5 mm; B = 1 mm.

FIGURE 1 in Shallow-water caridean shrimps from southern Bahia, Brazil, including the first record of Synalpheus ul (Ríos & Duffy, 2007) (Alpheidae) in the southwestern Atlantic Ocean

FIGURE 1. Location of the study area in southern Bahia, eastern Brazil. Horizontal bars indicate the northern (Cairú) and southern (Mucuri) limits. (CB) Camamu Bay, (RCB) Royal Charlotte Bank, (TSB) Todos os Santos Bay, (CS) outer border of the continental shelf. The main rivers are underlined. Scale bar: 100 km.