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Mactridae
Mactridae, common name the trough shells or duck clams, is a family (biology), family of saltwater clams, marine (ocean), marine bivalve mollusks in the order (biology), order Venerida. Description These clams have two short siphons, each with a horny sheath. The shell is shaped like a rounded-cornered equilateral triangle and there is a slight gape at the posterior. Each valve bears two cardinal teeth with four lateral teeth on the right valve and two on the left. The foot is white and wedge-shaped. They mostly inhabit the neritic zone. Ecology Trough shells burrow in sand or fine gravel and never in muddy substrates. Subfamilies and genera According to the World Register of Marine Species (2025), this family contains 56 genera and is split into the following subfamilies: Subfamily Darininae * ''Darcinia'' Clark, 1946 * ''Darina (bivalve), Darina'' J. E. Gray, 1853 Subfamily Lutrariinae * ''Eastonia'' J. E. Gray, 1853 * ''Heterocardia'' Deshayes, 1855 * ''Lutraria'' Lamarc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lutraria Lutraria2
''Lutraria'' is a genus of medium-sized Marine (ocean), marine bivalve mollusks or clams, commonly known as otter shells. Characteristics Members of this genus have large, elongated oval shells with two equal sized Valve (mollusc), valves. The anterior end is somewhat sharply curved but the posterior end is more rounded. The valves gape slightly at both ends, more so at the posterior end. The shell is fairly thick and is sculptured with fine concentric lines corresponding to periods of growth. The basic colour is white and the periostracum is brown, but the latter is usually abraded. The interior surface of the valves is glossy white. The beaks are blunt and situated slightly closer to the anterior end. The ligament is small and largely internal. The foot is small and the siphons are long and are housed in a common horny sheath for most of their length. Biology These mollusks live buried in sand to a depth of about , usually below low water mark, with their Siphon (mollusc anato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mactra Corallina
The rayed trough shell (''Mactra stultorum'', previously sometimes known as ''Mactra corallina''), is a species of edible saltwater clam, a marine bivalve mollusc in the family Mactridae, the trough shells. Distribution This species lives in the Black Sea, the Mediterranean coasts, and the west coast of Europe, from Norway to the Iberian Peninsula, and south to Senegal. Habitat This bivalve lives on sandy (rarely soft) bottoms at depths of between 5 and 30 m, although the shell is very often found on beaches, where it has been cast up by wave action. Shell description This species has a very thin and delicate shell, which has concentric growth lines and sometimes also has colored radiating bands, hence its common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often con ..., the ''r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zenatia
''Zenatia'' is a genus of medium-sized clams, marine bivalve molluscs in the family Mactridae. Distribution This genus is endemic to New Zealand. Species Species in the genus ''Zenatia'' include: * '' Zenatia acinaces'' ( Quoy and Gaimard Joseph Paul Gaimard (31 January 1793 – 10 December 1858) was a French naval surgeon and naturalist. Biography Gaimard was born at Saint-Zacharie on January 31, 1793. He studied medicine at the naval medical school in Toulon, subsequent ...) * '' Zenatia zelandica'' Gray References * Powell A. W. B., ''New Zealand Mollusca'', William Collins Publishers Ltd, Auckland, New Zealand 1979 Mactridae Bivalves of New Zealand Bivalve genera {{bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tresus
''Tresus'' is a genus of saltwater clams, marine bivalve mollusks in the family Mactridae. Many of them are known under the common name the horse clam or as species of gaper clam. They are similar to geoducks. Species Species within the genus ''Tresus'' include: * '' Tresus allomyax'' (Coan & Scott, 2000) – strange gaper * '' Tresus capax'' (Gould, 1850) – fat gaper * '' Tresus keenae'' (Kuroda & Habe, 1950) – mirugai clam * '' Tresus nuttallii'' (Conrad, 1837) – Pacific gaper * '' Tresus pajaroanus'' (Conrad, 1857) – lost gaper Habitat These species' habitat is the lower intertidal zones on out to waters as deep as 50–60 feet (13–15 m). They prefer sand, mud, and gravel substrates, normally burying themselves 12–16 inches (30–41 cm), so they are much easier to dig than geoducks. Their preferred substrates are also preferred by butter and littleneck clams, so horse clams are often taken incidentally in commercial harvesting. ''Tresus'' cla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lutraria
''Lutraria'' is a genus of medium-sized marine bivalve mollusks or clams, commonly known as otter shells. Characteristics Members of this genus have large, elongated oval shells with two equal sized valves. The anterior end is somewhat sharply curved but the posterior end is more rounded. The valves gape slightly at both ends, more so at the posterior end. The shell is fairly thick and is sculptured with fine concentric lines corresponding to periods of growth. The basic colour is white and the periostracum is brown, but the latter is usually abraded. The interior surface of the valves is glossy white. The beaks are blunt and situated slightly closer to the anterior end. The ligament is small and largely internal. The foot is small and the siphons are long and are housed in a common horny sheath for most of their length. Biology These mollusks live buried in sand to a depth of about , usually below low water mark, with their siphons extended to the sea bed. As they grow they b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spisula Solida
The surf clam (''Spisula solida'') is a medium-sized marine clam, or bivalve mollusc, found in the Eastern Atlantic from Iceland and northern Norway to Portugal and Spain. Up to long, like many clams, the surf clam is a sediment-burrowing filter feeder.''Spisula solida'' a entry''Spisula solida'' ,a Marbef entry
Right and left valve of the same specimen:
This species of clam is found ...
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Venerida
Venerida (formerly Veneroida) is an order of mostly saltwater but also some freshwater bivalve molluscs. This order includes many familiar groups such as many clams that are valued for food and a number of freshwater bivalves. Since the 2000s, the taxonomy currently represented in the World Register of Marine Species (WoRMS) classifies several taxa contained in the former Veneroida into other orders, such as the new Cardiida (for Cardioidea and Tellinoidea) and Carditida (cockles and their allies). Description Venerids are generally thick-valved, equal-valved and isomyarian (that is, their adductor muscles are of equal size). Three main hinge teeth are characteristic of the subclass Heterodonta, to which this order belongs. Many species are active rather than sessile. However, they tend to be filter feeders, feeding through paired siphons, with a characteristic folded gill structure adapted to that way of life. In 2002, Gonzalo Giribet and Ward Wheeler suggested that the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ninth and longest geological period of the entire Phanerozoic. The name is derived from the Latin , 'chalk', which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation . The Cretaceous was a period with a relatively warm climate, resulting in high Sea level#Local and eustatic, eustatic sea levels that created numerous shallow Inland sea (geology), inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence of brief periods of glaciation during the cooler first half, and forests extended to the poles. Many of the dominant taxonomic gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
