| Nipponacmea | |
|---|---|
 | |
| Nipponacmea fuscoviridis | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Patellogastropoda |
| Superfamily: | Lottioidea |
| Family: | Lottiidae |
| Genus: | Nipponacmea Sasaki & Okutani, 1993 [1] |
| Type species | |
| Patella schrenkiiLischke, 1868 | |
Nipponacmea is a genus of sea snails, the true limpets, marine gastropod mollusks in the family Lottiidae. [2]
These species are very common among the Japanese gastropod fauna on rocks and boulders in the intertidal zone of Japanese waters and adjacent islands.
The shape of the thin shell is limpet-like or patelliform. It has a medium size and has a low to medium height. The base (the aperture) has an oval shape and is longer than wide.
The color of the shell is greenish brown and characteristically bedecked with granules of fine radial riblets. . The interior is greenish blue and has a shining luster. The thin and broad interior shell margin exhibits a distinct color and texture from the adjoining area.
The shell is constituted of five layers of different structure, while the genus Notoacmea has six layers.
The gill is flaplike with a bipectinate ctenidium situated in the nuchal cavity and lacks secondary pallial gills. The radula has typically three pairs of lateral teeth and one pair of marginal teeth that is either lacks any function or is degenerated with growth or is lacking from the beginning.
Until 1993 the species of these Japanese limpets were allocated in the genus Notoacmea . [1] They were reassigned based on different anatomical characters and shell structure and their endemism to the Japonic zoogeographical province (Japanese waters and adjacent island chains). There wasn't just enough similarity with the New Zealand species from Notoacmea. Also the radula characters were different. Lindberg (in 1986) had pointed out that the genus Notoacmea was restricted to species from New Zealand and Australia and that the North American species belonged in Tectura. The eight Japanese species had been unsettled until this study. Some authors consider them color variations, others regard them as subspecies or as independent species. [1]
Species within the genus Nipponacmea include:
Notoacmea pileopsis, common name black edged limpet, is a species of sea snail or true limpet, a marine gastropod mollusc in the family Lottiidae, one of the families of true limpets.
Notoacmea is a southern genus of true limpets, marine gastropod molluscs in the subfamily Lottiinae of the family Lottiidae, the true limpets.
Lottiidae is a family of sea snails, specifically true limpets, marine gastropod mollusks in the superfamily Lottioidea and the clade Patellogastropoda.
Nipponacmea concinna is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea fuscoviridis is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea gloriosa is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea habei is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea moskalevi is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea nigrans is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea radula is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea schrenckii is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea teramachii is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponacmea vietnamensis is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Notoacmea elongata is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Notoacmea flammea is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Notoacmea potae is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Notoacmea rapida is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets.
Nipponaphera is a genus of sea snails, marine gastropod mollusks in the family Cancellariidae, the nutmeg snails.
Macleaniella is a genus of deep-sea limpets in the family Cocculinidae.
Erginus is a genus of sea snails, true limpets, marine gastropod mollusks in the family Erginidae.