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FIGURE 7 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 7. Digestive system of Olea hensoni n. sp. A, Lateral view. B, Dorsal view. C, Radula. D, Midgut, lateral view, cut longitudinally to show inner surface. an, anus; bm, buccal mass; dg, digestive gland; ds, septate muscle; es, esophagus; in, intestine; ma, ascus musculature; ns, central nervous system; sg, salivary glands; st, stomach. Scale: 0.5 mm.

FIGURE 6 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 6. Microscopic internal hard structures of Olea hensoni n. sp. A, Close-up of SEM image of the penis, showing curved penial stylet. B, SEM image of the whole penis. C, D Light microscope images of two separately prepared radulae; scale bars = 15 µm.

FIGURE 5 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 5. Internal morphology of Olea hensoni n. sp. A, Dorsal view of visceral mass. B, Ventral view of kidney and pericardium. C, Reproductive system. D, Anterior view of central nervous system. E, Posterior view of central nervous system. ab, abdominal ganglion; ag, albumen gland; am, ampulla; an, anus; au, auricle; bc, bursa copulatrix; bg, buccal gland; bm, buccal mass; bu, buccal ganglion; cg, capsule gland; cp, cerebro-pleural ganglion; dg, digestive gland; ey, eye; fc, fertilization chamber; fp, female aperture; gr, genital receptacle; hd, hermaphrodite duct; hf, hermaphrodite follicles; in, intestine; kd, kidney; md, male duct; mg, mucus gland; ns, central nervous system; np, nephrostome; ov, oviduct; pe, penis; pg, pedal ganglion; pr, prostate gland; sp, supra-intestinal ganglion; tg, tail gland; vd, vas deferens; vg, vaginal opening; vt, ventricle. Scale: 0.5 mm

FIGURE 4 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 4. External morphology of Olea hensoni n. sp. A–C, Views of a 1.5 mm specimen with cerata. Dorsal view (A); right lateral view (B); and ventral view (C). D–E, Views of a 2 mm specimen with cerata removed. Dorsal view (D); right lateral view (E). an, anus; ct, cerata; ey, eye fp, female aperture; ft, foot; hf, hermaphrodite follicles; mo, mouth; mp, male aperture; np, nephrostome; tl, tail; vg, vaginal opening. Scale: 0.5 mm.

FIGURE 3 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 3. Evolutionary relationships in Sacoglossa with emphasis on family Limapontiidae. Topology of the uncollapsed phylogram based on ML analysis of four loci (COI, 16S, H3 and 28S); support values above branches are posterior probabilities, below are bootstrap percentages; asterisk = 1.0 or 100% support. Bolded name denotes new taxon. Horizontal slashes indicate branch length shortened by half. Images credits: L. depressa and L. senestra, www.seaslugforum.org; E. felina, C. Trowbridge; "Gascoignella" jabae, C. Swennen; C. bellula, Coelho et al. 2006; remaining images from the authors.

FIGURE 2 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 2. Live specimens and eggs of Olea hansineensis. A, Live specimen from San Juan Island, WA; 3 mm long crawling when fully extended. B, Live specimen from San Juan Island, WA; 5 mm long crawling. C, Specimens on Melanochlamys diomedea egg mass. One specimen (upper left) is feeding inside the egg mass, with only the tips of the cerata extending out above the outer membrane of the egg mass; the second specimen (lower right) is crawling on the outside of the egg mass. Field of view: 7 mm. D, Egg mass with uncleaved ova laid by O. hansineensis; scale bar = 100 µm.

FIGURE 1 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

FIGURE 1. Live specimens and eggs of Olea hensoni n. sp. A, Right lateral view of live specimen, 2 mm long crawling. B, Dorsal view of live specimen, 2.5 mm long crawling. C, Left lateral view of live specimen, 5 mm long crawling. D, Dorsal view of live specimen, 5 mm long crawling. E, Ventral view of same specimen as (D) showing foot sole. F, Egg mass laid by O. hensoni n. sp. in the laboratory; width of egg spiral = 6 mm. G, Live specimen of O. hensoni n. sp. crawling on the surface of the cephalaspidean egg mass on which it was feeding in the field; width of egg mass = 8 mm.

SUPPLEMENTAL FIGURE S1 in Eggs sunny-side up: A new species of Olea, an unusual oophagous sea slug (Gastropoda: Heterobranchia: Sacoglossa), from the western Atlantic

SUPPLEMENTAL FIGURE S1. Underwater photograph of cephalaspidean egg mass containing live specimens of an unidentified oophagous heterobranch, possibly an undescribed Olea sp., from the tropical Indo-West Pacific Two specimens (dark in coloration) visible inside the egg mass (indicated by white arrows), with additional specimens possibly visible scattered throughout the inner jelly matrix. Scale bar = 1 mm.

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Fig. 3 in Phylogenetic evidence for multiple independent origins of functional kleptoplasty in Sacoglossa (Heterobranchia, Gastropoda)

Fig. 3 Phylogeny of the Sacoglossa based on Bayesian analysis (50 % majority rule consensus tree). Numbers at nodes indicate Posterior Probability (PP), black circles indicate PP=100, and black asterisks indicate PP=95–99. The inner dark gray circle borders functional-retention information of taxa, the outer food sources (displayed are only three major food sources per species). The scale bar displays substitutions per site. Yellow highlighted is the "outgroup", pink the Oxynoacea, purple the Platyhedylidae, green the " Limapontioidea ", and blue the

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Fig. 2 in Phylogenetic evidence for multiple independent origins of functional kleptoplasty in Sacoglossa (Heterobranchia, Gastropoda)

Fig. 2 Maximum quantum yield measurements (Fv/Fm) of Elysia clarki. Specimens of E. clarki were either starved under 40 μmol quanta m−2 s−1 (diamonds) or in complete darkness (rectangles) over a period of 49 days. Error bars indicate standard deviation between different specimens for each measuring point. Because specimens were fixed at certain intervals, finally only one individual was left at day 49

FIGURE 4 in On a new Ercolania Trinchese, 1872 (Opisthobranchia, Sacoglossa, Limapontiidae) living within Boergesenia Feldmann, 1950 (Cladophorales), with notes on anatomy, histology and biology

FIGURE 4: Ercolania kencolesi sp. nov.: Measurements of photosynthetic activity during a period of starvation interrupted with a period of four days, where feeding on Boergesenia was allowed. A: Yield values of photosynthesis measured over time. B: Ground fluorescence of photosynthesis (F0 [mV]) measured over time. Decline of values indicates the decrease of numbers of chloroplasts. Note the increase of ground fluorescence after feeding.

FIGURE 3 in On a new Ercolania Trinchese, 1872 (Opisthobranchia, Sacoglossa, Limapontiidae) living within Boergesenia Feldmann, 1950 (Cladophorales), with notes on anatomy, histology and biology

FIGURE 3: Ercolania kencolesi sp. nov.: larval development and adult radula. A: Veliger larva (day 5), lateral view after hatching from egg mass. B: Frontal view of similar developmental stage. C: Radula of paratype. Note the two preradular teeth (arrow). Abbreviations: dgl digestive gland, e eye, op operculum, st statocyst, yo yolk.

FIGURE 2 in On a new Ercolania Trinchese, 1872 (Opisthobranchia, Sacoglossa, Limapontiidae) living within Boergesenia Feldmann, 1950 (Cladophorales), with notes on anatomy, histology and biology

FIGURE 2: Ercolania kencolesi sp. nov.: Histology of organ systems. A: Cross section in the anterior third of body. B: Cross section in anterior half of body with genital system. C: Longitudinal section of rhinophore. Note that most of the algal chloroplasts are already consumed. D: Cross section in posterior third of body. E: Prostate gland. F: Cross section of eye. Abbreviations: algl albumen gland, am ampulla, cagl capsule gland, ce ceras, dgl digestive gland, ga ganglia, glst glandular structure, go gonad, mugl mucous gland, pe penis, pha pharynx, prgl prostate gland, sugl subepithelial glands.

FIGURE 1 in On a new Ercolania Trinchese, 1872 (Opisthobranchia, Sacoglossa, Limapontiidae) living within Boergesenia Feldmann, 1950 (Cladophorales), with notes on anatomy, histology and biology

FIGURE 1: Ercolania kencolesi sp. nov.: Living animals from Lizard Island; A: Animal freshly taken out of algal tube; length about 5 mm. B: Animal starved for 4 days; length about 3 mm. C: Animal within algal tube of Boergesenia after two hours; D: Two egg masses laid after 3 days since intrusion of animal into algal tube. E: Animal and egg mass within algal tube after two days.

Figure 5 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 5 Living specimens of Plakobranchus papua from Koh Tao A close-up of head, 28 mm specimen B dorsal view, 30 mm (photograph by Pau Urgell Plaza) C dorsolateral view of sequenced specimen, 27 mm.

Figure 2 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 2 Phylogenetic hypothesis for the Elysia japonica complex based on COI sequences. Sequences obtained in this study in bold. Bootstrap values from ML shown above branches and PP values from BI below branches. Tree rooted to Costasiella coronata (not shown).

Figure 1 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 1 Phylogenetic hypothesis of Plakobranchus based on COI sequences. Bootstrap values from ML shown above branch and posterior probability (PP) values below branch. Sequences obtained in this study in bold. Missing PP values, or those that support branch placements that deviate from the ML tree are denoted with an asterisk * and are due to the discrepancy between ML and BI topologies (see Suppl. material 1). Tree rooted to Costasiella coronata (not shown).

Figure 8 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 8 Illustrations and images of specimens belong to the Elysia japonica complex A–E illustrations taken from the original descriptions of species belonging to the Elysia japonica complex A, DElysia abei Baba, 1955 BElysia amakusana Baba, 1955 CElysia furvacauda Burn, 1958 E illustration of radula of Elysia japonica Eliot, 1913 by Baba (1949)F–JElysia aowthai sp. nov. showing variation in colouration, 12 mm (F), 9 mm (G), 11 mm (H, I), 8 mm (J).

Figure 4 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 4 Living specimens of Plakobranchus ocellatus from Koh Tao. A, B close-up of head with retracted rhinophores and dorsolateral view, 25 mm C sequenced specimen, 32 mm.

Figure 11 from: Mehrotra R, Caballer Gutierrez M, Scott CM, Arnold S, Monchanin C, Chavanich S (2020) On the Plakobranchidae (Gastropoda, Sacoglossa) from soft sediment habitats of Koh Tao, Gulf of Thailand, with descriptions of two new species. ZooKeys 969: 85-121. https://doi.org/10.3897/zookeys.969.52941

Figure 11 Genitalia and reproductive system of Elysia aowthai sp. nov., Koh Tao, Thailand, 15 mm alive. Abbreviations: ag – to the albumen gland; bc – bursa copulatrix; f – to the follicles; mg – mucus gland; p – penis; pr – to the prostate; v – vagina; vd – vas deferens; vo – vaginal opening.