| Dendrocoelopsis piriformis | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Platyhelminthes |
| Order: | Tricladida |
| Family: | Dendrocoelidae |
| Genus: | Dendrocoelopsis |
| Species: | D. piriformis |
| Binomial name | |
| Dendrocoelopsis piriformis Kenk, 1953 | |
Dendrocoelopsis piriformis is a species of freshwater triclad in the family Dendrocoelidae. [1] It is found in Alaska.
Though not explicitly stated in the original publication, the specific epithet is from the New Latin piriformis, meaning "pear-shaped", deriving from the shape of the species' body, which Roman Kenk explicitly describes as "pear-shaped" in his original description. [2]
Dendrocoelopsis piriformis is about fifteen millimeters long and three millimeters wide. It has a truncated head with two small auricles, the protruding of which creates the appearance of a neck. Its mouth is in the middle of its body; at the mouth level, the body is widest. The back of the body is a blunt point. It has two eyes. Its body has been described as a "cloudy brown or dark brownish gray" in color. Members of the species occasionally have stripes that are vertical down the length of the body; these specimens have one sharp middle stripe, flanked on either side by a light yellow band. Between the species' eyes, there is a dark field of pigment that extends to both sides of the worm's grasping organ. Above the organ, the area is white, as are the areas anterolateral to the eyes. Its underside is a light grey color. [2]
Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of yellow, orange, red and green coloration. The foregut, stomach and intestine run a little below the midline of the body, the anus is at the tip of the tail, and the mouth is under the front. A little above the gut is the rhynchocoel, a cavity which mostly runs above the midline and ends a little short of the rear of the body. All species have a proboscis which lies in the rhynchocoel when inactive but everts to emerge just above the mouth to capture the animal's prey with venom. A highly extensible muscle in the back of the rhynchocoel pulls the proboscis in when an attack ends. A few species with stubby bodies filter feed and have suckers at the front and back ends, with which they attach to a host.
Planarians (triclads) are free-living flatworms of the class Turbellaria, order Tricladida, which includes hundreds of species, found in freshwater, marine, and terrestrial habitats. Planarians are characterized by a three-branched intestine, including a single anterior and two posterior branches. Their body is populated by adult stem cells called neoblasts, which planarians use for regenerating missing body parts. Many species are able to regenerate any missing organ, which has made planarians a popular model in research of regeneration and stem cell biology. The genome sequences of several species are available, as are tools for molecular biology analysis.
The Pacific viperfish, Chauliodus macouni, is a predatory deep-sea fish found in the North Pacific. It is reported as being either mesopelagic or bathypelagic, with diel vertical migration to shallower waters. The Pacific viperfish is one of the nine different species that belong to the genus Chauliodus, the viperfish. The Pacific viperfish tend to be the largest of the species, typically reaching lengths of up to 1 foot and are considered an example of deep-sea gigantism. The length-weight relationship of the pacific viperfish varies with sex with females tending to be longer and heavier than males.
The dark shyshark or pretty happy is a species of catshark, belonging to the family Scyliorhinidae, endemic to the temperate waters off southern Namibia and western South Africa. It is benthic in nature and inhabits shallow, inshore waters and favors rocky reefs and kelp forests. Growing to 60 cm (24 in) long, this small, stocky shark has a wide, flattened head with a rounded snout and a large flap of skin extending from before the nostrils to the mouth. Its dorsal coloration is extremely variable and may feature black-edged orange to blackish saddles and/or white spots on a light brown to nearly black background.
The wildlife of Alaska is both diverse and abundant. The Alaskan Peninsula provides an important habitat for fish, mammals, reptiles, and birds. At the top of the food chain are the bears. Alaska contains about 70% of the total North American brown bear population and the majority of the grizzly bears, as well as black bears and Kodiak bears. In winter, polar bears can be found in the Kuskokwim Delta, St. Matthew Island, and at the southernmost portion of St. Lawrence Island. Other major mammals include moose and caribou, bison, wolves and wolverines, foxes, otters and beavers. Fish species are extensive, including: salmon, graylings, char, rainbow and lake trout, northern pike, halibut, pollock, and burbot. The bird population consists of hundreds of species, including: bald eagles, owls, falcons, ravens, ducks, geese, swans, and the passerines. Sea lions, seals, sea otters, and migratory whales are often found close to shore and in offshore waters. The Alaskan waters are home to two species of turtles, the leatherback sea turtle and the green sea turtle. Alaska has two species of frogs, the Columbia spotted frog and wood frog, plus two introduced species, the Pacific tree frog and the red-legged frog. The only species of toad in Alaska is the western toad. There are over 3,000 recorded species of marine macroinvertebrates inhabiting the marine waters, the most common being the various species of shrimp, crab, lobster, and sponge.
Hemaris thysbe, the hummingbird clearwing, is a moth of the family Sphingidae (hawkmoths). Coloration varies between individuals, but typically the moth is olive green and burgundy on its back, and white or yellow and burgundy on the underside. Its wings are transparent with a reddish-brown border. It has light-colored legs, which combined with the lack of striping on the underside is diagnostic. Beating its wings rapidly, H. thysbe hovers to collect nectar from a variety of flowers. The combination of its appearance and its behavior commonly leads to it being confused with a hummingbird or bumblebee.
Toxostoma is a genus of bird in the family Mimidae. This genus contains most of the birds called thrashers, and accordingly members of this genus are sometimes referred to as the "typical thrashers".
Weissius capaciductus is a species of dugesiid triclad found in Australia. It is the only species in the monotypic genus Weissius.
Dugesia aborensis is a species of freshwater triclad found in the Abor Hills, Arunachal Pradesh, India.
Supramontana irritata is a species of Brazilian land planarian in the subfamily Geoplaninae. It is the type species of the genus Supramontana.
Dendrocoelopsis alaskensis is a species of freshwater triclad in the family Dendrocoelidae. It is found in the White Mountains in Alaska.
Dendrocoelopsis americana is a species of triclad belonging to the family Dendrocoelidae. It has been found in the South Central United States.
Cura foremanii is a species of freshwater planarian belonging to the family Dugesiidae. It is found in freshwater habitats within North America.
Cratera anamariae is a species of land planarian belonging to the subfamily Geoplaninae. It is known from specimens found in Serra dos Órgãos National Park, Brazil.
Ectobius vittiventris, the amber wood cockroach or amber forest cockroach, is a species belonging to the order Blattodea and is a type of wood cockroach originally from southern Europe. It is completely harmless to humans and is not a storage pest, as it only feeds on decomposing plant material and perishes within a few days in human dwellings due to a lack of food. Its original range was south of the Alps, but is now permanently established north of the Alps and in southern Germany.
Procerodes littoralis is a species of triclad flatworm widely distributed on the shores of northwestern Europe and on the east coast of North America from Newfoundland northwards.
Glycera sheikhmujibi is a species of polychaete worm. This small worm is tubular and light pink in color.
Ikakogi ispacue is a species of amphibian in the Centrolenidae family, which can only be found in the northern Sierra Nevada de Santa Marta, in the department of Guajira, Colombia. It inhabits subtropical forests and is usually seen over vegetation and near streams.
Paraplanaria dactyligera is a species of triclad belonging to the family Planariidae. It has been found in the eastern United States.
Dugesia annandalei is a species of dugesiid planarian that is native to Myanmar. It is named after Nelson Annandale.
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