| Hypomesus | |
|---|---|
 | |
| Delta smelt, Hypomesus transpacificus | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Osmeriformes |
| Family: | Osmeridae |
| Genus: | Hypomesus T. N. Gill, 1862 |
Hypomesus is a genus of smelts (Osmeridae), consisting of five species found in the northern hemisphere.
There are currently five recognized species in this genus: [2]
The pond smelt H. olidus is widespread across northeastern Asia, Alaska, and northwestern Canada, while the Delta smelt H. transpacificus is an endangered species of the Sacramento Delta in California. H. chishimaensis was at one time thought to be a separate species, but has since been identified as a population of H. nipponensis.
| Hypomesus | |||||||||||||||||||||||||||
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| Phylogeny of the genus Hypomesus including H. chishimaensis under H. nipponensis. [3] [4] |
Smelts are a family of small fish, the Osmeridae, found in the North Atlantic and North Pacific oceans, as well as rivers, streams and lakes in Europe, North America and Northeast Asia. They are also known as freshwater smelts or typical smelts to distinguish them from the related Argentinidae, Bathylagidae, and Retropinnidae.
The Pantherinae is a subfamily of the Felidae; it was named and first described by Reginald Innes Pocock in 1917 as only including the Panthera species, but later also came to include the clouded leopards. The Pantherinae genetically diverged from a common ancestor between 9.32 to 4.47 million years ago and 10.67 to 3.76 million years ago.
The delta smelt is an endangered slender-bodied smelt, about 5 to 7 cm long, in the family Osmeridae. Endemic to the upper Sacramento-San Joaquin Estuary of California, it mainly inhabits the freshwater-saltwater mixing zone of the estuary, except during its spawning season, when it migrates upstream to fresh water following winter "first flush" flow events. It functions as an indicator species for the overall health of the Delta's ecosystem. Delta Smelt are usually found at temperatures of less than 25 °C and prefer temperatures of around 20 °C. They are euryhaline but occur mostly at salinities of 0–7 practical salinity units.
The rainbow smelt is a North American species of fish of the family Osmeridae. Walleye, trout, and other larger fish prey on these smelt. The rainbow smelt prefer juvenile ciscoes, zooplankton such as calanoid copepods, and other small organisms, but are aggressive and will eat almost any fish they find. They are anadromous spring spawners and prefer clean streams with light flow and light siltation. The rainbow smelt face several barriers. They are weak swimmers and struggle to navigate fish ladders preventing them from making it past dams to the headwater streams where they spawn. The rise in erosion and dams helped to decimate the smelt population in the 1980s. There are currently plans to try to reduce damming and to help control erosion.
The long-nosed mongoose is a mongoose native to Central African wetlands and rainforests. It has been listed as Least Concern on the IUCN Red List since 1996. Although formerly classified in Herpestes, more recent studies indicate that it belongs in the monotypic taxon Xenogale.
Galeus is a genus of deepwater catshark, belonging to the family Pentanchidae, commonly known as sawtail catsharks in reference to a distinctive saw-toothed crest of enlarged dermal denticles, found along the upper edges of their caudal fins. They are found in the Atlantic, the western and central Pacific, and the Gulf of California, inhabiting deep waters at or close to the sea floor. Members of this genus are rather small, slim sharks with firm bodies and thick, rough skin. Their heads are usually fairly long and pointed, and have large mouths with well-developed furrows at the corners. They have large pectoral and anal fins, and two similar dorsal fins placed well back. Many species are ornately patterned with dark saddles and/or blotches. Sawtail catsharks feed on various invertebrates and fishes, and may be either egg-laying or live-bearing. These harmless sharks are sometimes caught as bycatch but are of minimal commercial value.
Bolshoy Shantar is the main island of the Shantar Islands in the Sea of Okhotsk, Russia; its area is 1,766 square kilometres and it measures about 72 by 49 km. It has a large brackish lake on its north side which is connected to the sea through a narrow passage. Yakshin Bay indents the southwest side of the island.
Hypomesus japonicus, the Japanese smelt, is a coastal fish species of the northwestern Pacific Ocean, ranging from the Korean Peninsula and northern Japan to the Kuril Islands and Peter the Great Bay.
The San Francisco Estuary together with the Sacramento–San Joaquin River Delta represents a highly altered ecosystem. The region has been heavily re-engineered to accommodate the needs of water delivery, shipping, agriculture, and most recently, suburban development. These needs have wrought direct changes in the movement of water and the nature of the landscape, and indirect changes from the introduction of non-native species. New species have altered the architecture of the food web as surely as levees have altered the landscape of islands and channels that form the complex system known as the Delta.
In color science, color difference or color distance is the separation between two colors. This metric allows quantified examination of a notion that formerly could only be described with adjectives. Quantification of these properties is of great importance to those whose work is color-critical. Common definitions make use of the Euclidean distance in a device-independent color space.
The Night smelt is a true smelt of the northern family Osmeridae and part of the larger order Osmeriformes. The family of the true smelt consists of 12 species; 7 of which are native to California’s estuary and coastal waters. The night smelt is one of the three exact species in the Spirinchus genus, along with the Longfin Smelt (Spirinchus thaleichthys) and the shishamo (Spirinchus lanceolatus), native to northern Japan.
Enoplophthalmus is an extinct genus of prehistoric freshwater smelt that inhabited Europe during the Oligocene and early Miocene epoches, from the Rupelian to the Aquitanian. It appears to be closely related to the modern capelin. Until the description of the Paleocene-aged Speirsaenigma from Canada, it was the oldest known fossil smelt genus.
Hypomesus nipponensis is a commercial food fish native to the lakes and estuaries of northern Honshu and Hokkaido, Japan, Korea, and Sakhalin, Khabarovsk Krai, and Primorsky Krai, Russia. It has been introduced in other locations, including the San Francisco Delta of the United States. It is raised in fisheries, and is very similar in appearance to the delta smelt.
Allosmerus is a monotypic genus of smelt. Its sole species, Allosmerus elongatus, the whitebait smelt, is an uncommon Northeast Pacific smelt, about which little is known. Originally described as both Osmerus attenuatus and O. elongatus, these two species were determined to be conspecific in 1946. The fish can grow from 7–9 inches (18–23 cm) in length, has large eyes, a greenish-gray color on its back, and a silver band along its sides. Unlike most other smelt species which generally have no enlarged teeth in the roof of their mouth, the whitebait has single large tooth in the center of its vomer, which is sometimes flanked by a smaller tooth on either side. The adult males of the species have a longer anal fin.
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The Peltaspermales are an extinct order of seed plants, often considered "seed ferns". They span from the Late Carboniferous to the Early Jurassic or the Jurassic-Cretaceous Boundary. It includes at least one valid family, Peltaspermaceae, which spans from the Permian to Early Jurassic, which is typified by a group of plants with Lepidopteris leaves, Antevsia pollen-organs, and Peltaspermum ovulate organs, though the family now also includes other genera like Peltaspermopsis, Meyenopteris and Scytophyllum. Along with these, two informal groups of uncertain taxonomic affinities exist, each centered around a specific genus ; Supaia and Comia, known from the Early Permian of the Northern Hemisphere, especially of North America. Both the "Comioids" and the "Supaioids" are associated with the peltaspermacean ovulate organ Autunia. The Late Triassic-Middle Jurassic genus Pachydermophyllum may also have affinities to the peltasperms.
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Rosemary Margaret Smith (1933–2004) was a Scottish botanist and illustrator who specialized in the taxonomy of the Zingiberaceae, or ginger family. Many of the species she classified and identified as being placed into improper genera were found in Asian countries, especially in the isolated island of Borneo.
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