noms dans le fil d’Ariane
Rooiaas (Pyura stolonifera) is 'n manteldier of sakpyp wat aan die hele Suid-Afrikaanse kus voorkom.
Pyura stolonifera is 'n volop alleenstaande tussengetybewoner wat tot die klas Ascidiacea behoort. Dit is 'n pienk tot rooierige dier omhul in 'n dik, taai, leeragtige donkerbruin mantel met 'n verrimpelde bruin bedekking. Dit is gewoonlik dik oortrek met ander korsvormende organismes.
Die dier het twee suiers aan sy bokant wat gebruik word vir filtervoeding. Die een suier suig seewater in wat gefiltreer word in die dier en die afvalwater word dan deur die ander uitblaassuier uitgespuit. Dit het groot insuig- en uitblaassuiers met 'n effens geskulpte rand, gewoonlik naby aan mekaar geplaas.
Dit kom voor in rotsagtige gebiede in die laagwatersone tot ten minste 10 m onderwater, waar dit tot meer as 15 cm in hoogte kan groei. Die beste manier om rooiaas op te spoor tussen rotse, is om op te let na die straaltjies water wat luglangs gespuit word wanneer 'n brander terugtrek see in.
Rooiaas (Pyura stolonifera) is 'n manteldier of sakpyp wat aan die hele Suid-Afrikaanse kus voorkom.
Pyura stolonifera, commonly known in South Africa as "red bait" (or "rooiaas" in Afrikaans), is a sessile ascidian, or sea squirt, that lives in coastal waters attached to rocks or artificial structures.[1] Sea squirts are named for their habit of squirting a stream of water from their exhalant siphons when touched at low tide.
Pyura stolonifera is a very large solitary ascidian. It can grow to well over 15 cm in height. It has a thick pale exterior or 'tunic' which has a wrinkled brown covering. It has large inhalant and exhalant siphons with slightly scalloped edges, usually set close together. It is usually thickly covered with encrusting organisms.
This species is found in coastal areas of the cool-temperate and warm-temperate marine bioregions of southern African, from Namibia on the west coast to south-eastern South Africa,[2] but is absent from the region's subtropical and tropical bioregions. It is found from the intertidal zone to at least 10 m underwater.
Despite being one of the world's most conspicuous sea squirts, Pyura stolonifera is often confused with other, morphologically similar ascidians. It is the namesake of the so-called "P. stolonifera species complex" because the name P. stolonifera is often indiscriminately applied to all of them. The species complex presently includes the following species:
Pyura herdmani (Herdman's red bait), an African species whose range spans the temperate, subtropical and tropical marine bioregions of southern Africa, and that has also been reported from north-western Africa. Genetic data indicate that this species comprises at least three distinct evolutionary lineages, each of which may represent a distinct species: a temperate southern African form that often shares its habitat with P. stolonifera, a subtropical/tropical southern African form, and a north-western African form.[2]
Pyura praeputialis, commonly known as "cunjevoi" or "cunjie", is common in coastal areas of the Australian mainland and ranges from southern Queensland to Cape Otway in Victoria. It is a non-indigenous species in Antofagasta, Chile.[3]
Pyura doppelgangera (doppelganger cunjevoi) is morphologically very similar to P. praeputialis, but is usually smaller. It is particularly common in Tasmania but has also been reported from mainland Australia (Victoria and South Australia) and New Zealand.[4]
Pyura dalbyi (yellow cunjevoi) is common in Victoria. A small, geographically isolated population has been reported from Albany, Western Australia.[3]
Pyura stolonifera, commonly known in South Africa as "red bait" (or "rooiaas" in Afrikaans), is a sessile ascidian, or sea squirt, that lives in coastal waters attached to rocks or artificial structures. Sea squirts are named for their habit of squirting a stream of water from their exhalant siphons when touched at low tide.
Pyura stolonifera is een zakpijpensoort uit de familie van de Pyuridae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1878 door Heller.
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