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Fig. 3. Aspidosiphonids. A–C in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 3. Aspidosiphonids. A–C. Aspidosiphon (Aspidosiphon) elegans (Chamisso & Eysenhardt, 1821 (UMAR-SIPU 151). A. Lateral overview of specimen with budding. B. Anterior bidentate hook. C. Posterior conical hook. D–F. Aspidosiphon (Paraspidosiphon) pastori Silva-Morales & GómezVásquez, 2021 (UMAR-SIPU 154). D. Lateral overview, introvert partially everted. E. Anterior bidentate hook. F. Posterior pyramidal hook. Bd = bud. Scale bars: A, D = 3 mm; B–C = 20 µm; E–F = 10 µm.

Fig. 11 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 11. Apionsoma (Edmondsius) hendrickxi sp. nov. (EMU-13437). A. Internal anatomy; asterisk indicates ripped part of rectum. B. Illustration of internal anatomy. Abbreviations: see Material and methods. Scale bar = 5 mm.

Fig. 12. Phascosolomatids. A, C in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 12. Phascosolomatids. A, C. Apionsoma (Edmondsius) pectinatum (Keferstein, 1867 (ECOSURS0281). A. Lateral overview, introvert partially contracted.C. Hook. B, D. Phascolosoma (P.) puntarenae Grube & Öersted in Grube, 1858 (UMAR-SIPU 138). B. Lateral overview, introvert contracted. D. Hook. Scale bars: A–B = 5 mm; C = 20 µm; D = 40 µm.

Fig. 15 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 15. Sipunculus (Sipunculus) bastidai sp. nov. (UMAR-SIPU 129). A. Lateral overview, introvert with tentacular crown. B. Close view of mid-trunk papillae. C. Internal anatomy. D. Tentacles; asterisk indicates mouth. E. Cerebral ganglia. Abbreviations: see Material and methods. Scale bars: A, C = 20 mm; B = 3 mm; D = 2 mm.

Fig. 8 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 8. Apionsoma (Apionsoma) silviae sp. nov. (EMU-13436). A. Lateral overview, introvert partially everted. B. Posterior part of introvert. C. Posterior part of trunk. Abbreviation: see Material and methods. Scale bars: A = 3 mm; B–C = 1 mm.

Fig. 2 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 2. Antillesoma mexicanum Silva-Morales, López-Aquino, Islas-Villanueva, Ruiz-Escobar & Bastida-Zavala, 2019 (UMAR-SIPU 136). A. Lateral overview, introvert everted. B. Internal anatomy; asterisk shows detached part of nephridum. Abbreviations: see Material and methods. Scale bars = 10 mm.

Fig. 6. Golfingids. A in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 6. Golfingids. A. Golfingia (Golfingia) cf. muricaudata (EMU-13446). B–E. Nephasoma (Nephasoma) wodjanizkii wodjanizkii (Murina, 1973) (UMAR-SIPU 133). B. Lateral overview. C. Lateral view of posterior introvert. D. Internal anatomy. E. Close-up of retractor muscle origins from body wall. F. Themiste (Themiste) cf. blanda (ECOSUR-S0256). G. T. (T.) hennahi Gray, 1828 (ECOSUR-S0255). H. T. (T.) pyroides Chamberlin, 1920 (UMAR-SIPU 130). Abbreviations: see Material and methods. Scale bars: A = 2 cm; B, H = 2 mm; C, E = 1 mm; D, F = 4 mm; G = 3 mm.

Fig. 1. Study area. 1 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 1. Study area. 1 = Western coast of Baja California; 2 = Bahía de Los Ángeles; 3 = San Miguel Cove; 4 = Guaymas Bay; 5 = Puerta de Palapares; 6 = Isabel Island; 7 = Faro de Bucerías; 8 = Caleta de Campos; 9 = Caimancito Beach; 10 = El Tesoro Beach; 11 = Balandra Beach; 12 = Las Caleras; 13 = Caleritas Beach; 14 = Cerritos Beach; 15 = Pinitos Beach; 16 = Crestón Island; 17 = Aticama; 18 = Chacala; 19 = Rincón de Guayabitos; 20 = Raza Point; 21 = Sayulita Beach; 22 = Punta Mita; 23 = Manzanilla Beach; 24 = Los Arcos Beach; 25 = San Patricio Melaque; 26 = Barra de Navidad; 27 = La Audiencia Beach.

Fig. 5 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 5. Aspidosiphon (Aspidosiphon) sp. (EMU-13432). A–B. Bidentate laterally compressed hook. C–D. Unidentate hook with pyramidal base and cylindrical tip. E–F. Roll-type hook. Scale bars: A, C, E = 10 µm.

Fig. 4 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 4. Aspidosiphon (Aspidosiphon) sp. (EMU-13432). A. Lateral overview, introvert incomplete. B. Internal anatomy. C. Anal shield, dorsal view. D. Anal shield, lateral view. E. Caudal shield. Abbreviations: see Material and methods. Scale bars: A–B = 3 mm; C–E = 0.5 mm.

Fig. 9 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 9. Apionsoma (Apionsoma) silviae sp. nov. (EMU-13436). A. Internal anatomy. B. Illustration of internal anatomy. Abbreviations: see Material and methods. Scale bar = 2 mm.

Fig. 7 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 7. Phascolion (Lesenka) salgadoi sp. nov. (EMU-13448). A. Trunk overview, introvert contracted. B. Internal anatomy. C. Shell containing Ph. (L.) salgadoi. D. Hardened U-shaped holdfast papilla. E. Bladder shaped holdfast papillae. F. Type I hook. Abbreviations: see Material and methods. Scale bars: A = 3 mm; B = 2 mm; C = 2 cm; D = 0.5 mm; E = 1 mm; F = 15 µm.

Fig. 10 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 10. Apionsoma (Edmondsius) hendrickxi sp. nov. (EMU-13437). A. Lateral overview, introvert contracted. B–C. Hook. Scale bars: A = 5 mm; B = 20 µm.

Fig. 14 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 14. Phascolosoma (Phascolosoma) perlucens Baird, 1868 (ECOSUR S0044). A. Lateral overview, introvert contracted. B. Close-up of introvert base and anal area. C. Tentacles; asterisk indicates position of mouth. D. Mid-posterior hook; asterisk indicates bubble inside clear streak. E. Illustration of hook. F. Internal anatomy. Abbreviations: see Material and methods. Scale bars: A, F = 4 mm; B = 2 mm; C = 0.7 mm; D = 20 µm.

Fig. 13 in New records and five new species of sipunculans (Sipuncula) from the central and northwestern Mexican Pacific

Fig. 13. Phascolosoma (Phascolosoma) azteca sp. nov. (EMU-13443). A. Lateral overview, introvert contracted. B. Close-up of introvert base and anal area. C. Tentacles. D. Mid-posterior hook; asterisk indicates bubble inside clear streak. E. Illustration of hook. F. Internal anatomy. Abbreviations: see Material and methods. Scale bars: A, F = 2 mm; B–C = 0.5 mm; D–E = 20 µm.

FIG. 6 in Nudibranch molluscs of Sakhalin Island, Northwestern Pacific: new records and descriptions of two new species

FIG. 6. Molecular phylogenetic hypothesis of the family Onchidorididae, Bayesian Inference, concatenated dataset of three markers (COI + 16S + H3), species-level clades and genera are collapsed to a single branch, except the genus Adalaria. Asterisk indicates a clade containing type species of the genus Adalaria. Numbers above branches indicate posterior probabilities from Bayesian Inference (values higher than 0.9 are shown), numbers below branches – bootstrap support from Maximum Likelihood (in %, values higher than 60% are shown). РИС. 6. МолекулЯрно-филогенетическое дерево длЯ семейства Onchidorididae, основании комбинированного датасета (COI + 16S + H3) при помоЩи байесовского аналиЗа, клады видового уровнЯ сколлапсированы, кроме клад иЗучаемых видов с о. Сахалин. ЗвеЗдочкой обоЗначена клада с типовым видом рода Adalaria. ЗначениЯ над ветвЯми обоЗначают апостериорные вероЯтности (покаЗаны ЗначениЯ более 0.9). ЗначениЯ под ветвЯми обоЗначают поддерЖки бутстрепа (в %, покаЗаны ЗначениЯ более 60%).

FIG. 5 in Nudibranch molluscs of Sakhalin Island, Northwestern Pacific: new records and descriptions of two new species

FIG. 5. Radular morphology of Adalaria boussoleana sp. nov., holotype MIMB48047 (SEM). A. Median and anterior radular portion. B. Lateral and inner marginal teeth. C, D. Rachidian teeth. E. Lateral and marginal teeth, posterior radular portion. F. Marginal teeth. Scale bars: A = 100 µm; B, E = 50 µm; C, D, F = 20 µm. РИС. 5. МорфологиЯ радулы Adalaria boussoleana sp. nov., голотип MIMB48047 (СЭМ). A. СреднЯЯ и переднЯЯ часть радулы. B. Латеральные и внутренние маргинальные Зубы. C, D. Центральные Зубы. E. Латеральные и маргинальные Зубы, ЗаднЯЯ часть радулы. F. Маргинальные Зубы. Масштабные линейки: A = 100 µm; B, E = 50 µm; C, D, F = 20 µm.

FIG. 4 in Nudibranch molluscs of Sakhalin Island, Northwestern Pacific: new records and descriptions of two new species

FIG. 4. External morphology and spicular complex of Adalaria boussoleana sp. nov, holotype MIMB48047. A. Living specimen, dorsal view. B. Living specimen, lateral view from right. C, D, E. Spicular complex, (C) dorsal view, (D) ventral view, (E) lateral view. F. Spicules of ctenidia. G. Spicules of rhinophore in the front part of the body, lateral view. H. Spicules of the stellular tract at the tubercle base, front part of the body. H. Monoaxone spicules. J. Diaxone spicules. K. Multiaxone spicules. Abbreviation: sc = spicules of ctenidia; sf = spicules of foot; sne = spicules of notum edge; srh = spicules of rhinophore; srht = spicules of tubercles on rhinophoral sheath; sst = spicule of stellular tract. Photo credits: A, B. Anastassya Maiorova.

FIG. 2 in Nudibranch molluscs of Sakhalin Island, Northwestern Pacific: new records and descriptions of two new species

FIG. 2. Reproductive system morphology of Cadlina spp. from Aniva Bay and Adalaria boussoleana sp. nov. from the Sea of Okhotsk. A. Cadlina umiushi, MIMB48042. B. Cadlina sp., MIMB48045. C. Adalaria boussoleana sp. nov. MIMB48047. Abbreviations: am = ampulla; bc = bursa copulatrix; fgm = female gland mass; p = penis; pr = prostate; psh = penial sheath; pvd = prostatic vas deferens; rs = receptaculum seminis; va = vagina; vd = vas deferens. Scale bars: A, B = 1 mm; C = 5 mm. РИС. 2. ПоловаЯ система Cadlina spp. иЗ Залива Анива и Adalaria boussoleana sp. nov. иЗ Охотского морЯ. A. Cadlina umiushi, MIMB48042. B. Cadlina sp., MIMB48045. C. Adalaria boussoleana sp. nov. MIMB48047. СокраЩениЯ: am = ампулла; bc = копулЯтивнаЯ сумка; fgm = комплекс Женских ЖелеЗ; p = пенис; pr = простата; psh = сумка пениса; pvd – простатическаЯ часть семЯпровода, rs – семЯприемник; va – вагина; vd – семЯпровод. Масштабные линейки: A, B = 1 мм; C = 5 мм.

FIG. 1 in Nudibranch molluscs of Sakhalin Island, Northwestern Pacific: new records and descriptions of two new species

FIG. 1. External and internal morphology of Cadlina spp. from Aniva Bay. A. Cadlina sp. MIMB48044. B. Cadlina sp., MIMB48045. C. Cadlina umiushi, MIMB48042. D. Cadlina umiushi, MIMB48043. E. Cadlina umiushi, MIMB48042, in natural environment. F. Cadlina sp., MIMB48045, labial cuticle rodlets. G. Cadlina sp., MIMB48045, radula. H. Cadlina umiushi, MIMB48043, labial cuticle rodlets. I. Cadlina umiushi, MIMB48043, radula. K, N, O. Cadlina sp., MIMB48045, anterior radular portion, details of teeth morphology. L, M, P. Cadlina umiushi, MIMB48043, anterior radular portion, details of teeth morphology. Scale bars: F, H, N = 20 µm; G, I = 250 µm; K = 100 µm; L = 10 µm; M, O, P = 50 µm. Photo credits: A – D. Anton Plaksin; E. Alexander Semenov. РИС. 1. ВнешнЯЯ и внутреннЯЯ морфологиЯ Cadlina spp. иЗ Залива Анива. A. Cadlina sp. MIMB48044. B. Cadlina sp., MIMB48045. C. Cadlina umiushi, MIMB48042. D. Cadlina umiushi, MIMB48043. E. Cadlina umiushi, MIMB48042 в естественной среде. F. Cadlina sp., MIMB48045, родлеты лабиальной кутикулы. G. Cadlina sp., MIMB48045, радула. H. Cadlina umiushi, MIMB48043, родлеты лабиальной кутикулы. I. Cadlina umiushi, MIMB48043, радула. K, N, O. Cadlina sp., MIMB48045, переднЯЯ часть радулы, детали морфологии Зубов. L, M, P. Cadlina umiushi, MIMB48043, переднЯЯ часть радулы, детали морфологии Зубов. Масштабные линейки: F, H, N = 20 µm; G, I = 250 µm; K = 100 µm; L = 10 µm; M, O, P = 50 µm. Авторство фотографий: A – D. Антон Плаксин; E. Александр Семенов.