Stolidobranchia is an order of tunicate

Tunicate

Tunicates, also known as urochordates, are members of the subphylum Tunicata, previously known as Urochordata, a group of underwater saclike filter feeders with incurrent and excurrent siphons that is classified within the phylum Chordata. While most tunicates live on the ocean floor, others such...

s in the class Ascidiacea

Ascidiacea

Ascidiacea is a class in the Tunicata subphylum of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid.Ascidians are found all over the world, usually in shallow...

. The group includes both colonial and solitary animals. They are distinguished from other tunicates by the presence of folded pharyngeal baskets and the complete absence of an abdomen. The abdominal organs of other tunicates are instead located to one side of the pharyngeal basket in this group.

Taxonomy

• Hexacrobylidae
  Hexacrobylidae
  Hexacrobylidae are a family of benthic predatory tunicates. The taxon has two genera with a total of six species. Hexacrobylidae are in the order Pleurogona and in the class Ascidiacea.-Taxonomy:*Asajirus**Asajirus arcticus...
  
  
  • Asajirus Kott, 1989
  • Oligotrema Bourne, 1903

• Molgulidae
  • Anomopera Hartmeyer, 1923
  • Bostrichobranchus Traustedt, 1883
  • Eugyra Alder & Hancock, 1870
  • Fungulus Herdman, 1882
  • Gamaster Pizon, 1896
  • Minipera Monniot & Monniot, 1974
  • Molgula
    Molgula
    Sea Grapes or Molgula sp. are very common, globular, individual marine tunicates roughly the size of grapes. They are translucent with two protruding siphons. They are found subtidally, attached to slow-moving submerged objects or organisms....
    
    Forbes, 1848
  • Molguloides Huntsman, 1922
  • Namiella Monniot & Monniot, 1968
  • Paramolgula Traustedt, 1835
  • Pareugyrioides Hartmeyer, 1914
  • Protomolgula Monniot, 1971
  • Rhizomolgula Ritter, 1901

• Pyuridae
  Pyuridae
  Pyuridae is a family of Tunicates.-Genera:*Bathypera*Bathypera*Boltenia*Bolteniopsis*Cratostigma*Ctenicella*Ctenyura*Culeolus*Eupera*Halocynthia*Hartmeyeria*Herdmania*Heterostigma...
  
  
  • Bathypera Michaelsen, 1904
  • Bathypyura Monniot & Monniot, 1973
  • Boltenia Savigny, 1816
  • Bolteniopsis Harant, 1927
  • Claudenus Kott, 1998
  • Cratostigma Monniot & Monniot, 1961
  • Ctenyura Van Name, 1918
  • Culeolus Herdman, 1881
  • Halocynthia
    Halocynthia
    Halocynthia is a genus of tunicates. Species such as Halocynthia roretzi are used as food.-External links:* - Contains Halocynthia genus info...
    
    Verrill, 1879
  • Hartmeyeria Ritter, 1913
  • Hemistyela Millar, 1955
  • Herdmania Lahille, 1888
  • Heterostigma Ärnbäck-Christie-Linde, 1924
  • Microcosmus Heller, 1877
  • Paraculeolus Vinogradova, 1970
  • Pyura
    Pyura
    Pyura is a large genus of sessile ascidians that live in coastal waters at depths of up to 80 m . Like all ascidians, Pyura are filter feeders.-Species:Species in this genus include* Pyura abradata...
    
    Molina, 1782
  • Pyurella Monniot & Monniot, 1973

• Styelidae
  • Alloeocarpa Michaelsen, 1900
  • Arnbackia Brewin, 1950
  • Asterocarpa Brewin, 1946
  • Bathyoncus Herdman, 1882
  • Bathystyeloides Seeliger, 1907
  • Berillia Brewin, 1952
  • Botryllocarpa Hartmeyer, 1909
  • Botrylloides
    Botrylloides
    The "Chain Sea Squirts or Chain Tunicates" of the genus Botrylloides:Morphologically similar to Botryllus schlosseri and similarly widespread, Botrylloides is distinguished by having linearly-arranged, parallel "chains" of zooids as opposed to zooids like white or yellow stripes emanating from a...
    
    Milne-Edwards, 1841
  • Botryllus
    Botryllus
    Botryllus is a genus of colonial ascidian tunicates in the family Botryllidae.-Species:Species in this genus include: * Botryllus anceps * Botryllus arenaceus * Botryllus aster...
    
    Gaertner, 1774
  • Chorizocarpa Michaelsen, 1904
  • Cnemidocarpa Huntsman, 1913
  • Dendrodoa MacLeay, 1824
  • Dextrocarpa Millar, 1955
  • Diandrocarpa Van Name, 1902
  • Dicarpa Millar, 1955
  • Distomus Gaertner, 1774
  • Eusynstyela Michaelsen, 1904
  • Gynandrocarpa Michaelsen, 1900
  • Kukenthalia Hartmeyer, 1903
  • Metandrocarpa Michaelsen, 1904
  • Monandrocarpa Michaelsen, 1904
  • Oculinaria Gray, 1868
  • Oligocarpa Hartmeyer, 1911
  • Pelonaia Forbes & Goodsir, 1841
  • Podostyela
  • Polyandrocarpa Michaelsen, 1904
  • Polycarpa Heller, 1877
  • Polyzoa Lesson, 1831
  • Protostyela Millar, 1954
  • Psammobotrus Oka, 1932
  • Psammostyela Weinstein, 1961
  • Seriocarpa Diehl, 1969
  • Stolonica Lacaze-Duthiers & Délage, 1892
  • Styela
    Styela
    Styela is a genus of tunicates. Styela clava, an edible species, is known as an invasive species in some areas.Species include:*Styela angularis*Styela clava*Styela coriacea*Styela gelatinosa*Styela montereyensis...
    
    Fleming, 1822
  • Symplegma Herdman, 1886
  • Syncarpa Redikorzev, 1913
  • Theodorella Michaelsen, 1922
  • Tibitin Monniot, 1983