| Arbacia Temporal range: | |
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| Arbacia lixula | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Arbacioida |
| Family: | Arbaciidae |
| Genus: | Arbacia Gray, 1835 |
Arbacia is a genus of sea urchins, widespread in the Atlantic and eastern Pacific oceans.
According to the World Register of Marine Species this genus includes the following species:
Mesoplodont whales are 16 species of toothed whale in the genus Mesoplodon, making it the largest genus in the cetacean order. Two species were described as recently as 1991 and 2002, and marine biologists predict the discovery of more species in the future. A new species was described in 2021. They are the most poorly known group of large mammals. The generic name "mesoplodon" comes from the Greek meso- (middle) - hopla (arms) - odon (teeth), and may be translated as 'armed with a tooth in the centre of the jaw'.
Blainville's beaked whale, or the dense-beaked whale, is believed to be the widest ranging mesoplodont whale. The French zoologist Henri de Blainville first described the species in 1817 from a small piece of jaw — the heaviest bone he had ever come across — which resulted in the name densirostris. Off the northeastern Bahamas, the animals are particularly well documented, and a photo identification project started sometime after 2002.
The black geese of the genus Branta are waterfowl belonging to the true geese and swans subfamily Anserinae. They occur in the northern coastal regions of the Palearctic and all over North America, migrating to more southerly coasts in winter, and as resident birds in the Hawaiian Islands. Alone in the Southern Hemisphere, a self-sustaining feral population derived from introduced Canada geese is also found in New Zealand.
Cepphus is a genus of seabirds in the auk family also referred to as true guillemots or, in North America, simply as guillemots. The genus name Cepphus is from Ancient Greek κέπφος kepphos, a pale waterbird mentioned by Greek authors including Aristotle. The English word "guillemot" is from French guillemot probably derived from Guillaume, "William". "Murre" is of uncertain origins but may imitate the call of the common guillemot.
Carinaria is a genus of medium-sized floating sea snails, pelagic gastropod molluscs in the family Carinariidae.
Cellana is a genus of sea snails or limpets, marine gastropod molluscs in the family Nacellidae, the true limpets.
The Atlantic purple sea urchin is a species of sea urchins from the family Arbaciidae, native to the Atlantic Ocean.
Dentalium is a large genus of tooth shells or tusk shells, marine scaphopod molluscs in the family Dentaliidae. The genus contains 50 described species and about 50 extinct species.
Acanthopleura is a genus of chitons in the family Chitonidae. In this genus the girdle is spiny or spiky. It has eight described species at present.
The family Cavoliniidae is a taxonomic group of small floating sea snails, pelagic marine opisthobranch gastropod mollusks.
Hemitoma is a genus of slit limpets, marine gastropod molluscs in the family Fissurellidae, the keyhole limpets and slit limpets.
Arbacia lixula, the black sea urchin, is a species of sea urchin from Europe.
Acanthinucella is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails.
Spatangus is a genus of heart urchins in the Spatangidae family. The genus is synonymous with the previously recognised genera Prospatangus Lambert, 1902 and Spatagus. There are nine recognised species. The type species is Spatangus purpureus Müller, 1776 by subsequent designation.
Trigonostoma is a genus of sea snails, marine gastropod mollusks in the family Cancellariidae, the nutmeg snails.
Arbacia dufresnii is a species of sea urchin of the family Arbaciidae. Its armour is covered with spines. A. dufresnii was first scientifically described in 1825 by Blainville.
Arbacia stellata, the black starry sea urchin, is a species of sea urchin of the family Arbaciidae. Their armour is covered with spines. It is placed in the genus Arbacia and lives in the sea. Arbacia stellata was first scientifically described in 1825 by Blainville.
A. punctulata may refer to:
Diacria trispinosa is a holoplanktonic species of gastropods belonging to the family Cavoliniidae. It is classified as a mesoplankton. It is a pteropod.
Liolophura is a genus of chitons, or polyplacophorans, marine mollusks whose shell is composed of eight articulating plates or valves.
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