| Appendicularia | |
|---|---|
 | |
| Appendicularia sp. specimen | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Tunicata |
| Class: | Appendicularia |
| Order: | Copelata |
| Family: | Fritillariidae |
| Subfamily: | Appendiculariinae Seeliger, 1895 |
| Genus: | Appendicularia Fol, 1874 |
| Type species | |
| Appendicularia sicula Fol, 1874 | |
| Species | |
| |
| Synonyms [1] | |
| |
Appendicularia is a genus of larvaceans in the family Fritillariidae.
The genus name Appendicularia was originally coined by Chamisso and Eysenhardt in 1821, naming the first discovered larvacean Appendicularia flagellum. However, the lack of an accurate description made it a nomen nudum , leading to it being reused by Hermann Fol for the species Appendicularia sicula. [2]
Appendicularia is relatively small in comparison to other larvaceans, with an adult body length of around 0.4 mm and a tail length of around 1.1 mm in A. sicula. The body is flattened in its front half, and bulged in its posterior half. The house is ellipsoidal, measuring around 2.6 mm in length.
The first description of Appendicularia sicula was made from specimens found near Messina, Italy. [2] Since then, it has also been found in low-depth waters near the coasts of the Japanese islands of Kyushu and Hokkaido. [3]
A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata. It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords. The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals. They are the only chordates that have lost their myomeric segmentation, with the possible exception of the 'seriation of the gill slits'. However, doliolids still display segmentation of the muscle bands.
Bigfin squids are a group of rarely seen cephalopods with a distinctive morphology. They are placed in the genus Magnapinna and family Magnapinnidae. Although the family was described only from larval, paralarval, and juvenile specimens, numerous video observations of much larger squid with similar morphology are assumed to be adult specimens of the same family.
Larvaceans or appendicularians, class Appendicularia, are solitary, free-swimming tunicates found throughout the world's oceans. Like most tunicates, larvaceans are filter feeders. Unlike most other tunicates, they keep their tadpole-like shape as adults, with the notochord running through the tail. They can be found in the pelagic zone, specifically in the photic zone, or sometimes deeper. They are transparent planktonic animals, usually ranging from 2 mm (0.079 in) to 8 mm (0.31 in) in body length including the tail, although giant larvaceans can reach up to 10 cm (3.9 in) in length.
The tiger snake is a large and highly venomous snake of southern Australia, including its coastal islands and Tasmania. These snakes are often observed and locally well known by their banding, black and yellow like a tiger, although the species can be highly variable in coloration and patterning. All populations are classified within the genus Notechis (Elapidae). Their diverse characteristics have been classified either as distinct species or by subspecies and regional variation.
The tiger shrike or thick-billed shrike is a small passerine bird which belongs to the genus Lanius in the shrike family, Laniidae. It is found in wooded habitats across eastern Asia. It is a shy, often solitary bird which is less conspicuous than most other shrikes. Like other shrikes it is predatory, feeding on small animals. Its nest is built in a tree and three to six eggs are laid.
Oikopleura is a genus of tunicates in the class Appendicularia (larvaceans). It forms a mucus house every four hours at 20 degrees Celsius. This house has a coarse mesh to keep out big particles, and a fine mesh that collects the small particles, down to the nanoplankton that includes (pelagic) bacteria.
The northern sawtail catshark is a little-known species of catshark, and part of the family Scyliorhinidae, endemic to northeastern Australia. It is demersal in nature and inhabits the upper continental slope at a depth of 300–420 m (980–1,380 ft). A small, slender species growing no longer than 42 cm (17 in), the northern sawtail catshark is characterized by a series of dark, narrow saddles along its back and tail, and rows of prominently enlarged dermal denticles along the upper edge of its caudal fin and the underside of its caudal peduncle. The International Union for Conservation of Nature (IUCN) does not yet have enough information to assess its conservation status.
True's shrew mole is a species of mammal in the family Talpidae. It is endemic to Japan and is a common species above 1000 meters in grassland, shrubland and forest. Sometimes this species is called the lesser Japanese shrew mole and another species, Urotrichus talpoides, is called the "greater Japanese shrew mole".
Phylliroe is a genus of average sized, highly transparent pelagic nudibranchs, marine gastropod molluscs in the order Opisthobranchia, that consists of two known species. It is notable for being an open-ocean hunter that resembles a fish in body plan and locomotion, an example of convergent evolution.
Apororhynchus is a genus of small parasitic spiny-headed worms. It is the only genus in the family Apororhynchidae, which in turn is the only member of the order Apororhynchida. A lack of features commonly found in the phylum Acanthocephala suggests an evolutionary branching from the other three orders of class Archiacanthocephala; however no genetic analysis has been completed to determine the evolutionary relationship between species. The distinguishing features of this order among archiacanthocephalans is a highly enlarged proboscis which contain small hooks. The musculature around the proboscis is also structured differently in this order. This genus contains six species that are distributed globally, being collected sporadically in Hawaii, Europe, North America, South America, and Asia. These worms exclusively parasitize birds by attaching themselves around the cloaca using their hook-covered proboscis. The bird hosts are of different orders, including owls, waders, and passerines. Infestation by an Apororhynchus species may cause enteritis and anemia.
Gigantorhynchus is a genus of Acanthocephala that parasitize marsupials, anteaters, and possibly baboons by attaching themselves to the intestines using their hook-covered proboscis. Their life cycle includes an egg stage found in host feces, a cystacanth (larval) stage in an intermediate host such as termites, and an adult stage where cystacanths mature in the intestines of the host. This genus is characterized by a cylindrical proboscis with a crown of robust hooks at the apex followed by numerous small hooks on the rest of the proboscis, a long body with pseudosegmentation, filiform lemnisci, and ellipsoid testes. The largest known specimen is the female G. ortizi with a length of around 240 millimetres (9.4 in) and a width of 2 millimetres (0.08 in). Genetic analysis on one species of Gigantorhynchus places it with the related genus Mediorhynchus in the family Gigantorhynchidae. Six species in this genus are distributed across Central and South America and possibly Zimbabwe. Infestation by a Gigantorhynchus species may cause partial obstructions of the intestines, severe lesions of the intestinal wall, and may lead to death.
The roughback sculpin is a species of marine ray-finned fish belonging to the family Cottidae, the typical sculpins. This species is found in the eastern Pacific Ocean. The roughback sculpin is the only known member of the genus Chitonotus.
Gerontoformica is an extinct genus of stem-group ants. The genus contains thirteen described species known from Late Cretaceous fossils found in Asia and Europe. The species were described between 2004 and 2016, with a number of the species formerly being placed into the junior synonym genus Sphecomyrmodes.
Bathochordaeus, the giant larvaceans, is a genus of larvacean tunicates in the family Oikopleuridae.
Elthusa californica is a species of isopod in the family Cymothoidae of the order Isopoda. E.californica is a saltwater parasitic isopod. Like many species of the Elthusa genus, E. californica was first placed in within the Liveneca genus, but later underwent taxonomic revisions.
Kowalevskia is a genus of larvacean tunicates, the only one in the family Kowalevskiidae.
Althoffia is a monotypic genus of larvacean tunicates belonging to the family Oikopleuridae. The only species is Althoffia tumida.
The Talysch mole is a species of mammal in the family Talpidae. It is a small member of the family, which outwardly resembles the Levant mole, but is genetically closer to Père David's mole. It is common on the southwest coast of the Caspian Sea, from southern of Azerbaijan through most of the north of Iran. The habitat includes temperate rainforests and scrub areas. There is little information about the life history of the Talysch mole. It was described in 1945, but had long been considered a subspecies of various other Eurasian moles, and was only recognized as a distinct species in the mid-2010s. No surveys have been carried out to quantify the status of the species.
Solitudo is an extinct genus of tortoise that was found during the Pliocene and Pleistocene on the Mediterranean islands of Menorca, Malta and Sicily. The genus includes three described species, Solitudo robusta, Solitudo gymnesica and Solitudo sicula as well as a likely fourth, undescribed species from Monte Pellegrino in Sicily. Solitudo sicula, the youngest of the species, died out approximately 12.5 thousand years BP. The largest species, Solitudo gymnesica, has been estimated to have reached a carapace length of 1.1–1.3 m (3.6–4.3 ft).
Mesochordaeus is a genus of oikopleurid larvacean, related to Bathochordaeus.
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