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FIGURE 2 in Heterobranch Sea Slugs from Hazard Canyon Reef, San Luis Obispo County, California

FIGURE 2. Hazard Canyon Reef. (A) Study site (outlined in white), looking northwest, 23 November 2011, -0.33 m tide, with a building ocean swell. The crevice forming the slender extension of the study area visible here is about 25 m long. (B) At northwestern-most part of study area, 26 May 2017, tide level at -0.46 m.

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FIGURE 6 in Heterobranch Sea Slugs from Hazard Canyon Reef, San Luis Obispo County, California

FIGURE 6. Yearly change in abundance of the most abundant nudibranchs at Hazard Canyon, 2005–2021. (A) three northern species, and (B) three southern taxa. Values shown are yearly means +- 1 SE of monthly number of individuals per hour per observer; note separate, logarithmic axis in (B) for Okenia rosacea. In (B) Doriopsilla spp. = D. albopunctata and D. fulva, which combined were considered D. albopunctata until delineated by Hoover et al. (2015).

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FIGURE 3 in Heterobranch Sea Slugs from Hazard Canyon Reef, San Luis Obispo County, California

FIGURE 3. Seasonal variation at Hazard Canyon Reef in (A) number of species of Heterobranchia found per month, and (B) total number of individuals of Heterobranchia found per observer per hour. Values shown are means ± 1 SE of monthly data averaged by season across all years sampled (n = 8, 21, 3, 15 for winter, spring, summer, fall, respectively)..

FIGURE 8 in The Sea Slug Phanerophthalmus luteus (Gastropoda: Opisthobranchia) and its Habitat and Ecology at the Marine Jellyfish Lake (Ongeim'l Tketau), Palau, Western Pacific Ocean

FIGURE 8. Central and Western Pacific showing the distribution of Phanerophthalmus luteus (black stars) and the location of Jellyfish Lake, Palau (large gray star). Modified from distribution map for P. luteus in Austin, Gosliner, and Malaquias (2018, fig. 23).

FIGURE 5 in The Sea Slug Phanerophthalmus luteus (Gastropoda: Opisthobranchia) and its Habitat and Ecology at the Marine Jellyfish Lake (Ongeim'l Tketau), Palau, Western Pacific Ocean

FIGURE 5. Hydrography of Jellyfish Lake. The water column is divided into an oxic and an anoxic zone by a bacterial plate that creates a chemo- and thermocline. The bacteria absorb all the light and digest most of the vegetation (except larger branches). No foraminifera or animals are known to live below the bacterial plate due to the absence of oxygen in the water column. Phanerophthalmus luteus is restricted to the upper 3 to 10 m in the oxygenated part of the water column; they are most abundant between 4.5 and 7.6 m. Figure modified from Venkateswaran et al. (1993) by adding the depth distribution of P. luteus.

FIGURE 4 in The Sea Slug Phanerophthalmus luteus (Gastropoda: Opisthobranchia) and its Habitat and Ecology at the Marine Jellyfish Lake (Ongeim'l Tketau), Palau, Western Pacific Ocean

FIGURE 4. Bathymetry of Jellyfish Lake, Mecherchar Island. The gray line with arrows indicates the area in the lake of our marine survey to 10 m deep for sea slugs along the north and east sides of the lake. Black circles indicate the transect and collecting stations for foraminifera used to estimate the depth distribution of Phanerophthalmus luteus. Map and transect from Lipps and Langer 1999.

FIGURE 3 in The Sea Slug Phanerophthalmus luteus (Gastropoda: Opisthobranchia) and its Habitat and Ecology at the Marine Jellyfish Lake (Ongeim'l Tketau), Palau, Western Pacific Ocean

FIGURE 3. Vegetation of Jellyfish Lake, Mecherchar Island. A. The lake, slightly less than 400 m long, is in a hole at least 230 m deep (150 to 200 m from the top of the hole to the Lake's surface and 30 m to the bottom of the lake) in the Miocene limestone. North is at the top of the image. B. Dense terrestrial vegetation, including mangroves at the lake edges, hangs over the lake. The surrounding vegetation contributes organic debris to the lake. C. Bottom of the lake from 0 to 13 m is covered with plant debris and algal growth. Photograph is at 2 m deep looking down slope. D. One of many logs that have fallen into the lake and are now inhabited by a wide variety of algae and animals including P. luteus. View is down the log from a depth of about 0.5 m. Credits: A. Aerial photograph courtesy of Dr. Pat Colin. B.-D. Photographs by Jere H. Lipps, 2013.

FIGURE 7 in The Sea Slug Phanerophthalmus luteus (Gastropoda: Opisthobranchia) and its Habitat and Ecology at the Marine Jellyfish Lake (Ongeim'l Tketau), Palau, Western Pacific Ocean

FIGURE 7. Egg masses (more or less spherical to oblong white objects) of Phanerophthalmus luteus attached to filamentous and other algae on a slope in Jellyfish Lake. Photograph taken November 16, 2009, courtesy of Lori J. Bell.

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Fig. 1 Live discodorid sea slugs, dorsal views. a Peltodoris atromaculata Bergh, 1880. b Discodoris boholiensis Bergh, 1877. c in A warning for ecologists and conservation biologists using species checklists: How the European marine fauna 'lost' all of its 16 Discodoris species (Mollusca: Gastropoda)

Fig. 1 Live discodorid sea slugs, dorsal views. a Peltodoris atromaculata Bergh, 1880. b Discodoris boholiensis Bergh, 1877. c Tayuva lilacina (Gould 1852). d "Montereina" aurila (Marcus and

Fig. 13 in Fig. 5 in Fig. 2 in An Updated Checklist of Sea Slugs (Gastropoda, Heterobranchia) from Hong Kong Supported by Citizen Science.

Fig. 13. Austruca albimana (Kossmann, 1877), SEM images of the telson of zoea II; a) at magnification 6000×; b) at magnification 10000×.

Fig. 15 in Fig. 5 in Fig. 2 in An Updated Checklist of Sea Slugs (Gastropoda, Heterobranchia) from Hong Kong Supported by Citizen Science.

Fig. 15. Austruca albimana (Kossmann, 1877), SEM images of the telson of zoea IV at magnification 40000×.

Fig. 10 in Fig. 5 in Fig. 2 in An Updated Checklist of Sea Slugs (Gastropoda, Heterobranchia) from Hong Kong Supported by Citizen Science.

Fig. 10. Austruca albimana (Kossmann, 1877), dorsal view of pleon: a) zoea I; b) zoea II; c) zoea III; d) zoea IV; e) fork of the telson of zoea IV; dorsal view of pleon: e) megalopa.

Fig. 9 in Fig. 5 in Fig. 2 in An Updated Checklist of Sea Slugs (Gastropoda, Heterobranchia) from Hong Kong Supported by Citizen Science.

Fig. 9. Austruca albimana (Kossmann, 1877), second maxilliped: a) zoea I; b) zoea II; c) zoea III; d) zoea IV; e) megalopa; f) third maxilliped of zoea IV; g) third maxilliped of megalopa.

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FIGURE 4 in Heterobranch Sea Slug Range Shifts in the Northeast Pacific Ocean associated with the 2015-16 El Niño

FIGURE 4. Abundance of the Bulla gouldiana and Aplysia vaccaria in the low rocky intertidal at Naples, Santa Barbara, California 2006–2017.

Fig. 3 in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 3. Drawings of Swennenia jabae (Swennen, 2001). A, dorsal view of animal with important parts indicated; B, pharynx; C, eye; D, penis; E, teeth; F, diagram of digestive system; G, diagram of reproductive system. Abbreviations: ad, albumen duct; ag, albumen gland; an, anus; as, ascus; cc, central canal; cg, capsule gland; dg, digestive gland; ey, eye; ga, ganglion; gr, genital receptacle; hd, hermaphrodite duct; hg, hermaphrodite follicles; in, intestine; lo, large oviduct; ma, male aperture; mu, mucus gland; oa, oviducal aperture; oe, oesophagus; ph, pharynx; pr, prostate; ps, penis style; rp, renal pore; sr, seminal receptacle; st, stomach; te, teeth; va, vagina aperture; vd, vas deferens;?, indeterminate gland.

Fig. 4 in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 4. Internal organs of Swennenia jabae. A, pericardium; B, dorsal view of the body with the skin removed to show the hermaphrodite follicles and septum; C, dorsal view with the skin and internal organs removed to show the septum; D, penial style; E, hermaphrodite follicles; F, position of digestive gland, hermaphrodite follicles, and albumen gland. Abbreviations: ag, albumen gland; dg, digestive gland; ey, eye; h, heart; hf, hermaphrodite follicles; in, intestine; ki, kidney; se, septum.

Fig. 2 in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 2. Swennenia jabae (Swennen, 2001), total length including cerata ca. 6 mm, from Pattani Bay photographed in the lab. A, slight dorso-lateral view; B, dorsal view.

Fig. 1. A in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 1. A, natural habitat in Pattani, Thailand, with mat of the algae Boodleopsis cf. pusilla, amongst pneumatophores in the mangroves; B, clay blocks cut out of the ground.

Fig. 6 in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 6. Egg mass and embryos of Swennenia jabae. A, egg string; B, closer view of egg string showing individual capsules; C, veligers about to hatch on 4th day.

Fig. 5 in A new genus Swennenia for Gascoignella jabae Swennen, 2001, a small rare mangrove dwelling sea slug in the Gulf of Thailand, with notes on the species (Gastropoda: Sacoglossa: Plakobranchoidea)

Fig. 5. Dorsal view of animal. A, faeces being expelled in thin strings from the anus (total length including cerata ca. 5.5 mm); B, animal with new ceras being regenerated (total length including cerata ca. 3 mm).