Asperarca | |
---|---|
Asperarca nodulosa | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Bivalvia |
Order: | Arcida |
Family: | Arcidae |
Genus: | Asperarca Sacco, 1898 |
Species | |
See text |
Asperarca [1] is a genus of bivalves in the family Arcidae [2] which currently consists of eight species. They attach themselves to rocks or hard substrates with byssal threads in shallower, coastal waters. It was first described by Dr. Federico Sacco in December 1898 with the type taxon A. nodulosa that has been recorded throughout the coastal Mediterranean Sea, Baltic Sea, and northeastern Atlantic Ocean. [1] The earliest known species are A. acuta and A. microida which were found in 2014 in Ukraine from the Eocene Epoch. [3]
Shells in this genus are elongated and rectangular at about 6-32 millimeters in length. The hinged side of the shell is a straight line which curves into a rounded edge. One side of the hinge has 10-20 prominent teeth while the other has matching indentations. The prodissoconch starts out rounded and nearly circular before stretching into a parallelogram with a distinct diagonal point on the far end of the adult shell. Some have described it as more of a trapezoid shape. Shells tend to have a tan or beige periostracum and are convex with the highest point just in front of the hinge. [4] Byssal threads extend from the hinge to attach shells to hard surfaces or substrates.
Scallop is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops. However, the common name "scallop" is also sometimes applied to species in other closely related families within the superfamily Pectinoidea, which also includes the thorny oysters.
A cockle is an edible marine bivalve mollusc. Although many small edible bivalves are loosely called cockles, true cockles are species in the family Cardiidae.
Dreissena is a genus of small freshwater mussels in the family Dreissenidae in the class Bivalvia. They are found attached to firm substrates by threads from underneath the shells and are the only freshwater bivalves to attach to hard substrates in high densities while having a planktonic larval stage. They are considered the most aggressive freshwater invader in the world because of their ability to invade environments in every one of their life cycle.
The Arcida is an extant order of bivalve molluscs. This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size. The duplivincular ligament, taxodont dentition, and a shell microstructure consisting of the outer crossed lamellar and inner complex crossed lamellar layers are defining characters of this order.
Mytilidae are a family of small to large marine and brackish-water bivalve molluscs in the order Mytilida. One of the genera, Limnoperna, even inhabits freshwater environments. Mytilidae, which contains some 52 genera, is the only extant family within the order Mytilida.
Tridacna crocea, the boring clam, crocus clam, crocea clam or saffron-coloured clam, is a species of bivalve in the family Cardiidae. It is native to the Indo-Pacific region. It is occasionally found in the aquarium trade where it is often simply referred to as crocea.
A bivalve shell is part of the body, the exoskeleton or shell, of a bivalve mollusk. In life, the shell of this class of mollusks is composed of two hinged parts or valves. Bivalves are very common in essentially all aquatic locales, including saltwater, brackish water, and freshwater. The shells of bivalves commonly wash up on beaches and along the edges of lakes, rivers, and streams. Bivalves by definition possess two shells or valves, a "right valve" and a "left valve", that are joined by a ligament. The two valves usually articulate with one another using structures known as "teeth" which are situated along the hinge line. In many bivalve shells, the two valves are symmetrical along the hinge line—when truly symmetrical, such an animal is said to be equivalved; if the valves vary from each other in size or shape, inequivalved. If symmetrical front-to-back, the valves are said to be equilateral, and are otherwise considered inequilateral.
Tectonatica is a genus of sea snails, marine gastropod molluscs in the subfamily Naticinae of the family Naticidae, the moon snails.
Monophorus is a genus of minute sea snails with left-handed shell-coiling, marine gastropod mollusks or micromollusks in the family Triphoridae.
Arca noae or the Noah's Ark shell is a species of bivalve mollusc in the family Arcidae. It is found in the Mediterranean Sea from low tide mark to a depth of 60 metres (200 ft).
Protobranchia is a subclass of bivalve molluscs. It contains the extant orders Nuculanida, Nuculida, and Solemyida.
Carlo Pollonera was an Italian painter, particularly of landscapes, and also an important malacologist.
Solatisonax is a genus of sea snails, marine gastropod mollusks in the family Architectonicidae, the staircase shells or sundials.
This bibliography lists publications authored by the Italian malacologist and painter Carlo Pollonera (1849-1923). The article endeavours to be comprehensive, and includes all works listed in previous bibliographies of Pollonera. Zoological Record and AnimalBase have also been utilised. Works listed without an internet link have generally not been examined directly. Dates given here follow those printed on the individual issue wrappers, which sometimes differ from those on the title page of the volume.
Pseudotoma is an extinct genus of predatory sea snails, marine gastropod mollusks belonging to the family Turridae.
Nucinellidae is a family of bivalves, in the order Solemyida. Its species are small and principally reside in deep-water environments. The species' average length is less than 5 millimetres (0.20 in), the largest species being Nucinella boucheti at a length of 25 millimetres (0.98 in). The family's characteristic features include large gills and reduced palps and their appendages; oval shells with few hinge teeth; they possess a single adductor muscle and one divided foot exhibiting papillae. The family contains two known genera: Huxleyia and Nucinella. Speaking of Nucinella, the genus' ligament system is of the simple arched type, lacking nymphae. Regarding the former, the system is "submerged" beneath its dorsal margin.
Ganula is a genus of gastropods belonging to the family Hygromiidae.
Sabatia is a genus of sea snails, marine gastropod molluscs in the family Scaphandridae, the canoe bubbles.
Saccella is a genus of bivalves belonging to the family Nuculanidae.
Alvania rotulata is an extinct species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.