Coelotrochus chathamensis | |
---|---|
Drawing of a shell of Coelotrochus chathamensis | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Vetigastropoda |
Order: | Trochida |
Superfamily: | Trochoidea |
Family: | Trochidae |
Genus: | Coelotrochus |
Species: | C. chathamensis |
Binomial name | |
Coelotrochus chathamensis (Hutton, 1873) | |
Synonyms | |
|
Coelotrochus chathamensis is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails or top shells. [1] [2]
The length of the shell varies between eight mm and 10 mm. The small shell has a conical shape, the sides are straight or slightly convex.. The angle of the spire is 70°. The five, rarely six, whorls are flat with an elevated upper edge, and, together with the base, spirally striated. The pointed protoconch is regularly conical, and consists of about two whorls. These are not marked off from the succeeding whorl. This one is, smooth, with two or three spiral red bands. The last two whorls increase rapidly in size. They are flat to slightly convex above, concave below before reaching the strong and prominent cingulum. The body whorl has a distinct peripheric keel.
The sculpture consists of five to six low spiral threads, the lower and upper margins much elevated, especially the former. They are crossed by broad nodulous radiate ribs, which, however, do not extend over the lower half of the whorl. These ribs are often obsolete. The suture is superficial, with a nodulous border below. The false umbilicus is narrow and not very deep. The oblique aperture is rhomboidal. The outer and basal lip are a little convex, forming a sharp angle where they meet.
The oblique columella is slightly concave. It has an almost imperceptible posterior fold, but the anterior portion is nearly smooth. The axial cavity is small and smooth. The color of the shell is white, buff with pink or oblique brownish purple stripes or spots. The flat base of the shell is white with interrupted pink, subequal spiral lines. [3] [4]
This marine species is endemic to New Zealand and occurs the Chatham Islands, Southern North Island, Stewart Islands and the Auckland Islands.
Diloma aethiops, whose common names include scorched monodont, spotted black topshell, and in the Māori language pūpū, pūpū-mai, or māihi is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, subfamily Monodontinae.
Coelotrochus oppressus, common name the shouldered top shell, is a species of very small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails or top shells.
Diloma coracinum is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails. The Māori name is māihi.
Trochus camelophorus is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.
Calliostoma bairdii, common name the Baird's top shell, is a species of sea snail with an operculum, a marine gastropod mollusk in the family Calliostomatidae, the calliostoma top snails.
Cantharidus capillaceus is a species of sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.
Cantharidus opalus, common name the opal top shell or in the Māori language matangongore, is a species of large sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.
Micrelenchus sanguineus is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top shells.
Zenepos totolirata is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
Oxystele impervia is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Calliostoma supragranosum Carpenter, 1864 is a species of sea snail, a marine gastropod mollusk in the family Calliostomatidae, which was formerly placed within the Trochidae or top snails. Its common name is the granulated top snail.
Roseaplagis artizona is a species of sea snail in the family Trochidae, the top snails.
Cantharidus dilatatus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Cantharidus marmoreus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Micrelenchus tenebrosus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Coelotrochus carmesinus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Coelotrochus viridis, common name the green top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.
Borsonia mitromorphoides is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae.
Antiguraleus mundus is a species of sea snail, a marine gastropod mollusc in the family Mangeliidae.
Neoguraleus amoenus is a species of sea snail, a marine gastropod mollusc in the family Mangeliidae.