taxonID	type	description	language	source
1096864F94B05ECFBDA60C5059C946F8.taxon	type_taxon	Type species. Bathylepeta laevis Moskalev, 1977, by original designation.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
1096864F94B05ECFBDA60C5059C946F8.taxon	diagnosis	Diagnosis. Emended based on results of this study after Moskalev (1977) and Schwabe (2006): Lepetid limpet with oval aperture outline, apex at postcentral position directed posteriorly, radula basal plates slightly overlapping to non-overlapping, marginal teeth with serrated or smooth edges.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
45F591E5E4AA5D14A747576970482340.taxon	description	Figs 2, 3, 4	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
45F591E5E4AA5D14A747576970482340.taxon	diagnosis	Diagnosis. A very large (at least up to 40.5 mm SL) Bathylepeta with about 80 clearly defined white radial streaks on the shell. When alive, ventral tissue generally pigmented reddish brown, oral shield greyish, oral lappets also reddish brown. Second lateral teeth very well-developed, each as large as the fused pair of first laterals. Basal plate rectangular, slightly overlapping. Marginal teeth also very well-developed, forming overhanging, spoon-like cusps larger in size than the laterals, edges smooth. Jaw strongly mineralised and reinforced. Genital papillae small, about 0.7 mm long when alive and contracted.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
45F591E5E4AA5D14A747576970482340.taxon	description	Description. Shell (Fig. 3) large (holotype 40.5 mm SL), limpet-formed, thin, translucent, bluish-grey, slightly elastic, possibly reflecting high organic content. Shell height nearly half of shell length. Apex postcentral at just behind centre of shell, strongly corroded, likely due to abyssal habitat below calcium compensation depth. Entire shell with fine concentric growth lines, crossed by about 80 clearly defined white radial streaks that decrease in strength outwards (Fig. 3 C). Aperture broad oval, rate of widening increases from the final one-fourth of shell growth (Fig. 3 D – E). Shell margin not thickened, with sharp edge, margin smooth, uninterrupted. Protoconch corroded away in holotype. Jaw plate (Fig. 4 A) very sturdy, off-white, heavily mineralised, about 4 mm wide (mineralised part 2 mm wide). Cutting-edge U-shaped central part further reinforced with chitinous plates on inner side. Radula (Fig. 4 B – H) docoglossate, formula 2 - 2 - 0 - 2 - 2. Rachidian tooth lacking. Central element comprising two pairs of lateral teeth. First pair of lateral teeth fused together to form sharply pointed cusp with faint line at centre where fusion occur; bluntly pointed with overhanging, smooth cutting edges. Second laterals well-developed, each as large as fused pair of first laterals, with triangular, sharply pointed cusps with smooth cutting edge, pointed upwards at much higher angle compared to first laterals. Cusps of all laterals dark in colour, indicative of reinforcement by iron oxide (goethite), as for most other patellogastropod limpets. Basal plates underneath laterals whitish in colour (likely indicative of calcification), rectangular in outline, slightly imbricating with adjacent plates. Marginal teeth chitinous, translucent, strongly curved distally. Cusps of marginals well-developed, with broad, spoon-like overhanging morphology carrying rounded, smooth cutting edges. Marginal cusps much larger than those of laterals. Inner marginal (Fig. 4 H) slightly wider than outer marginal (Fig. 4 G), with broader shaft. External anatomy (Fig. 5) when alive shows strong reddish-brown pigmentation when viewed ventrally, especially on inner fold of mantle edge; oral shield greyish in colour. Foot cream, lacking colouration. Mouth large, rounded with well-sized oral shield, containing heavily mineralised jaw. Oral lappets present on both sides of oral shield, large, reddish brown when alive. Pigmented eyes lacking. Cephalic tentacles simple, conical, elongate, tapering to a fine tip distally. Mantle edge thick, undulating, smooth, tentacles lacking. Mantle cavity shallow around foot, depressed in cephalic region. Genital papillae (Fig. 5 E) present on right side, posterodorsal to right cephalic tentacle, located just right of anus, rather short at about 0.7 mm long when retracted and alive. Foot oval, fleshy, with undulating edge when contracted. Shell muscle horseshoe-shaped, occupying posterior two-thirds of body, split into numerous distinct muscular bundles. Dorsal aspect of soft parts seen through mantle roof (Fig. 5 D) largely occupied by very voluminous, dark-brown digestive gland. Intestine forms three loops, last two loops embedded in digestive gland. Final loop exits digestive gland from left side of mantle roof as rectum. Gonad (Fig. 5 A) voluminous, positioned anteroventral of digestive gland and final loop of intestine. Gonad of holotype slightly damaged during collection, with some oocysts emerging; thus, holotype is female, assuming gonochorism like most other patellogastropod limpets. Ctenidium absent.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
45F591E5E4AA5D14A747576970482340.taxon	etymology	Etymology. From ‘ Wadatsumi ’, god of the sea in Japanese mythology, alluding to its very deep habitat. It is also a reference to the fish-man character “ Large Monk ” Wadatsumi from Eiichiro Oda’s manga series " ONE PIECE " (Oda 2011), whose enormous body size is reminiscent of the large size that B. wadatsumi sp. nov. reaches for a deep-water patellogastropod. Used as a noun in apposition.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
45F591E5E4AA5D14A747576970482340.taxon	distribution	Distribution. Only known from the type locality at 5922 m deep, living on hard volcanic rock covered by a thin layer of sediment (Fig. 1 B). A winding feeding trail is clearly visible posterior to the limpet, indicating it feeds on this sediment layer. Several individuals were sighted from the viewport of the submersible, but only one individual (the holotype) was successfully collected.	en	Chen, Chong, Tsuda, Miwako, Ishitani, Yoshiyuki (2025): A new large-sized lepetid limpet from the abyssal northwestern Pacific is the deepest known patellogastropod. Zoosystematics and Evolution 101 (3): 1249-1258, DOI: 10.3897/zse.101.156207
