|
Polyascidae
Polyascidae is a family of parasitic barnacles in the class Thecostraca. There are at least two genera and about eight described species in Polyascidae. Genera These genera belong to the family Polyascidae: * '' Parasacculina'' Høeg & Glenner, 2019 * '' Polyascus'' Glenner, Lützen & Takahashi, 2003 References Further reading * Barnacles {{crustacean-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thecostraca
Thecostraca is a class of marine invertebrates containing over 2,200 described species. Many species have planktonic larvae which become sessile or parasitic as adults. The most important subgroup are the barnacles (subclass Cirripedia), constituting a little over 2,100 known species. The subgroup Facetotecta contains a single genus, ''Hansenocaris'', known only from the tiny planktonic nauplii called "y-larvae". These larvae have no known adult form, though it is suspected that they are parasites, and their affinity is uncertain. Some researchers believe that they may be larval tantulocaridans. No larval tantulocaridans are currently known. The group Ascothoracida contains about 110 species, all parasites of coelenterates and echinoderms. Classification This article follows Chan et al. (2021) and the World Register of Marine Species in placing Thecostraca as a class of Crustacea and in the following classification of thecostracans down to the level of orders. Previously, Theco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyascus
''Polyascus'' is a genus of barnacles in infraclass Rhizocephala. It was circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every polyg ... in 2003 by Henrik Glenner, Jørgen Lützen, and Tohru Takahashi. They included three species, all transferred from '' Sacculina''. The generic name ''polyascus'' (''poly'' "many" + ''ascus'' "bag") refers to the typical presence of multiple external sac-like female bodies, known as ''externae''. In ''Polyascus'' species, these originate from asexual reproduction. Species , WoRMS recognizes the following three species, all included in the genus's circumscription. References Barnacles Parasites of crustaceans Parasitic crustaceans Crustacean genera {{maxillopoda-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |