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Figure 26 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 26. Penis, Melayonchis aileenae. (a) Vietnam (ITBZC IM 00007). (b) Malaysia (USMMC 00021). – (c) Malaysia (USMMC 00019, #1). Scale bars: 100 μm.

Figure 9 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 9. Habitats for Melayonchis siongkiati. (a) Type locality, Singapore, Mandai River, open mangrove forest with tall trees and soft mud (station 6). (b) Malaysia, Peninsular Malaysia, Matang, old and open Rhizophora forest with tall trees, hard mud, creeks and many dead logs (station 28). (c) Brunei Darussalam, Pulau Pyatan, open mangrove with a few sparse old trees, and large old logs, by the river (station 32). (d) Vietnam, Can Gio, open mangrove with large Avicennia trees, soft mud, some dead logs (station 231).

Figure 7 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 7. Reproductive system, Melayonchis eloisae, Malaysia (USMMC 00007, #1). (a) Anterior, male apparatus. (b) Posterior hermaphroditic (female) reproductive system. Abbreviations: dd, deferent duct; fgm, female gland mass; hd, hermaphroditic duct; hg, hermaphroditic gland; ov, oviduct; ps, penial sheath; rm, retractor muscle; rs, receptaculum seminis; sp, spermatheca; spv, spermoviduct; v, vestibule. Scale bar: a = 2 mm; b = 1.5 mm.

Figure 23 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 23. Melayonchis aileenae, Malaysia (USMMC 00019, #1). (a) Digestive system. (b) Posterior, hermaphroditic (female) reproductive system. (c) Anterior, male apparatus. Abbreviations: dd, deferent duct; ddg, dorsal lobe of digestive gland; fgm, female gland mass; hd, hermaphroditic duct; hg, hermaphroditic gland; i, intestine; ldg, lateral lobe of the digestive gland; ov, oviduct; pdg, posterior lobe of the digestive gland; ps, penial sheath; rg, rectal gland; rm, retractor muscle; rs, receptaculum seminis; sp, spermatheca; spv, spermoviduct; st, stomach. Scale bar: a = 3 mm; b = 2.6 mm; c = 1.6 mm.

Figure 2 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 2. Histogram showing the distribution of pairwise genetic distances within the data, obtained using ABGD. The unique, large and obvious barcode gap between 5 and 14% is used here as an objective separation between intraspecific (<5%) and interspecific (> 14%) divergences. There is a continuum within both intraspecific and interspecific divergences (i.e. no additional gap can be detected within intraspecific or interspecific divergences, even though there is a peak of intraspecific divergences <1% and a peak of interspecific divergences between 16 and 17%.

Figure 24 in A new genus and four new species of onchidiid slugs from South-East Asia (Mollusca: Gastropoda: Pulmonata: Onchidiidae)

Figure 24. Radula, Melayonchis aileenae, Malaysia (USMMC 00019, #2). (a) Median region of left half rows. (b) Rachidian and innermost teeth. (c) Rachidian and innermost teeth. (d) Outermost lateral teeth. (e) Lateral teeth. The arrows indicate the lateral protuberance which is characteristic of the teeth in Melayonchis. Scale bars: a = 40 μm; b, e = 10 μm; c, d = 5 μm.

Figure 4 in A study of triphorid larvae and post-larvae at the Campos Basin deep-sea floor, southeastern Brazil (Gastropoda: Triphoroidea)

Figure 4. Simplified hypotheses of metamorphosis occurring at mid-water or at the deep-sea floor. = adult; = larvae; = post-larvae; = dead specimen.

Figure 2 in A study of triphorid larvae and post-larvae at the Campos Basin deep-sea floor, southeastern Brazil (Gastropoda: Triphoroidea)

Figure 2. Larvae and post-larvae obtained from Campos Basin slope. a–b, f–i. Cosmotriphora melanura, MNRJ 33604. c–e. Post-larvae of pattern 2–1-2-(1), MNRJ 33606 (c), MNRJ 33650 (d–e). j–m. Monophorus olivaceus, MNRJ 33607. n–q. Iniforis pseudothomae, MNRJ 33649. Scale bars: a–g, l– o = 250 μm; h–k, p–q = 50 μm.

Figure 1 in A study of triphorid larvae and post-larvae at the Campos Basin deep-sea floor, southeastern Brazil (Gastropoda: Triphoroidea)

Figure 1. Oceanprof study site in Campos Basin (a–b), and its varied deep-sea bottom (c–f). c. Soft sediment, predominating in this area. d–e. Sponge banks, at 820 and 1025 m, respectively. f. Coral reef, at 248 m. Scale bars: a = 1000 km; b = 200 km.

Figure 3 in A study of triphorid larvae and post-larvae at the Campos Basin deep-sea floor, southeastern Brazil (Gastropoda: Triphoroidea)

Figure 3. Larvae and post-larvae obtained from Campos Basin slope (cont.). a–b. Sagenotriphora osclausum, IBUFRJ 19982. c–d. Similiphora intermedia, MNRJ 33652. e–h. Larvae of pattern 2–1-2-(1), MNRJ 33311. i–m. Post-larvae of pattern 2–1-2-(1), IBUFRJ 16902 (i), MNRJ 33606 (j–k), MNRJ 33650 (l–m). N-O. Cerithiopsis flava (C. B. Adams), MNRJ 34108. p–q. Post-larvae of Cerithiopsis sp., MNRJ 34107. Scale bars: a, d–e, h–j, m, o–q = 250 μm; b–c, f–g, k–l, n = 50 μm.

Figure 4 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)

Figure 4. Longitudinal (LS) and transverse (TS) transmission electron micrograph sections of spermatozoa of Gyraulus (Gyraulus) albus. (a) LS, sperm head at the final stage of maturation. (b, c) LS, internal structure of the acrosomal complex. (d) TS, acrosomal pedestal. (e) TS, basal portion of the nucleus with trapezoid coarse fibres. (f) TS, neck region with trapezoid coarse fibres and a single glycogen mass surrounded by a thin band of mitochondrial derivative. (g) TS, anterior midpiece with triangular coarse fibres and four glycogen helices enclosed within a mitochondrial derivative. (h) LS, posterior portion of the nucleus, neck region and anterior portion of the midpiece. (i) LS, middle portion of the midpiece showing four glycogen helices, mitochondrial derivative and axial complex. (j) TS, middle portion of the midpiece showing three glycogen helices, mitochondrial derivatives and axial complex. (k) TS, middle portion of the midpiece with two glycogen helices, mitochondrial derivative and axoneme. (l) TS, posterior midpiece with a single glycogen helix. (m) TS, posterior

Figure 3 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)

Figure 3. Longitudinal (LS) and transverse (TS) transmission electron micrograph sections of spermatozoa of Gyraulus (Armiger) crista. (a, b) LS, head of a spermatozoon at the final stage of maturation. (c) LS, internal structure of the acrosomal complex. (d) TS, middle portion of the nucleus. (e) TS, basal portion of the nucleus with trapezoid coarse fibres and a single glycogen mass surrounded by a thin band of mitochondrial derivative. (f) TS, neck region with triangular coarse fibres and four glycogen helices enclosed within the mitochondrial derivative. (g) LS, middle portion of the midpiece with three glycogen helices, mitochondrial derivative and axoneme. (h) TS, middle portion of the midpiece with two glycogen helices, mitochondrial derivative and axoneme. (i) TS, posterior portion of the midpiece with a single glycogen helix. (j) TS, portion of the midpiece without glycogen helices. (k, l) LS, annulus region showing a ring at the tip of the mitochondrial derivative (black arrows) and a cylinder at the anterior end of the glycogen piece (white arrows). (m) TS, glycogen region with the axoneme. (n) TS, axoneme in the tail region with a complete 9 + 2

Figure 2 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)

Figure 2. Scanning electron micrographs of sperm heads. (a) Gyraulus (Armiger) crista. (b) Gyraulus (Gyraulus) albus. Scale bars: a, b = 1 µm.

Figure 1 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)

Figure 1. General view of spermatozoa. Light microscopy. (a) Gyraulus (Armiger) crista. (b) Gyraulus (Gyraulus) albus. Scale bars: a, b = 50 µm.

Figure 8 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 8. Habitats of Horatia-like snails in the caves of the South Caucasus. Left – Nizhneshakuranskaya Cave, right – Tskhal-Tsiteli Cave.

Figure 7 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 7. Shells of Motsametia and Pontohoratia. (A, B) Pontohoratia birsteini comb. nov., Tsebeldinskaya Cave; (C) Pontohoratia birsteini comb. nov., Niznheshakuranskaya Cave; (D) Pontohoratia smyri, holotype (Novoafonskaya Cave); (E) Motsametia borutzkii, topotype (Tskhal-Tsiteli Cave). Scale bars 300 μm.

Figure 5 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 5. The penis morphology in Caucasian 'Horatia'. (A) Motsametia borutzkii (Tskhal- Tsiteli Cave); (B) Pontohoratia smyri; (C) 'Horatia' sokolovi = Pontohoratia birsteini (Nizhneshakuranskaya Cave). Scale bar 0.5 mm.

Figure 6 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 6. Distribution of values of the BWH/SH index in a sample of 'Horatia' sp. from Nizhneshakuranskaya Cave (n = 100). Associated normal-distribution curve is given.

Figure 3 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 3. Canonical roots provided by discriminant analysis run for five morphospecies of Horatia-like species from South Caucasus.

Figure 2 in Revision of 'Horatia' snails (Mollusca: Gastropoda: Hydrobiidae sensu lato) from South Caucasus with description of two new genera

Figure 2. Shells of type specimens (holotypes and syntypes) of nominal Caucasian species of 'Horatia'. (A) Horatia sokolovi (ZIN); (B) H. borutzkii (after Shadin 1932); (C) H. ljovushkini (ZIN); (D) H. birsteini (ZIN). Scale bars 0.5 mm.