Gastrotrich 28-III
PROTOSTOMIA
Lophotrochozoa
 
 
A gastrotrich on a filament of algae.
[Photo © www.micrographia.com]



Chapter Outline
  1. Description of Protostomia
  2. Classification of Protostomia
  3. Lophotrochozoa
  4. Annelida
  5. Mollusca
  6. Ecdysozoa
  7. Panarthropoda

Tree



Links to external sites will appear in pop-up windows.		  
Lophotrochozoa is one of two subgroups of Protostomia, containing the following phyla and a class:
  • PHYLUM GASTROTRICHA - Gastrotrichs
  • PHYLUM ENTOPROCTA - Goblet Worms
  • PHYLUM BRYOZOA - Bryozoans
  • PHYLUM ACANTHOCEPHALA - Thorny-Headed Worms
  • PHYLUM ROTIFERA - Rotifers
  • PHYLUM NEMERTEA - Ribbon Worms
  • PHYLUM CYCLIOPHORA - Symbion pandora
  • CLASS MICROGNATHOZOA - Limnognathia maerski
  • PHYLUM BRACHIOPODA - Lampshells
  • PHYLUM ANNELIDA - Segmented Worms (28-IV)
  • PHYLUM MOLLUSCA - Mollusks (28-V)
GASTROTRICHA 

"There are some 400 species (of gastrotrichs) inhabiting both salt and fresh water. The marine forms are found living between the sand grains of the intertidal zone, and the freshwater forms are found among the plants and algae of the pond's margins." [First Link Below]

As of 2024, 8 species of Gastrotricha have been observed in iNaturalist in the US and 19 throughout the world.

  • ORDER CHAETONOTIDA
    • Chaetonotus spp.
  • ORDER MACRODASYIDA
    • Pseudostomella spp.
Links:
ENTOPROCTA 

Entoprocta is the phylum of Goblet worms. As of 2024, 4 species of Entoprocta have been observed in iNaturalist in the US and 7 throughout the world.
  • Goblet Worms (Barentsia)
Links:
BRYOZOA 

This is the phylum of Bryozoans.As of 2024, 79 species of Bryozoa have been observed in iNaturalist in the US and 278 throughout the world.
  • CLASS GYMNOLAEMATA
    • ORDER CHEILOSTOMATIDA
      • Feather-Bryozoan (Bugula plumosa)
    • ORDER CTENOSTOMATIDA
  • CLASS PHYLACTOLAEMATA
    • Magnificent Bryozoan (Pectinatella magnifica) - Perry Lake, KS, Walnut River, KS
  • CLASS STENOLAEMATA
    • ORDER CYCLOSTOMATIDA
      • Crisia spp.
    • ORDER TUBULIPORIDA
Links:
ACANTHOCEPHALA 

Thorny-Headed Worms may be found as parasites in birds, mammals, reptiles, fishes, crustaceans, roaches and grubs.As of 2024, only 1 species of Acanthocephala has been observed in iNaturalist in the US and 3 throughout the world.
Links:
ROTIFERA 

"The discovery of rotifers or "wheel animalcules" dates back nearly three centuries to their first description in 1703 by Leeuwenhoek. They are rather complex, multicellular animals with a size range from roughly 40 microns to over 2,000 microns, so many of them are smaller than the larger members of the protozoa. An excellent reason for studying rotifers is that they are found in such a wide variety of environments, so that if you poke around a bit you're almost certain to have an encounter of the rotifer kind. They are in virtually every lake and stream, every pond, on bits of moss in moist forest, in the tropics and even in icy arctic terrains. A virtually guaranteed place to find some is in sphagnum moss at the edge of a pond or lake. There are marine rotifers, but the vast majority occur in fresh water." - Richard L. Howey

As of 2024, 86 species of Rotifera have been observed in iNaturalist in the US and 180 throughout the world.

  • CLASS BDELLOIDEA
    • ORDER ADINETIDA
    • ORDER PHILODINAVIDAE
    • ORDER PHILODINIDA
      • Philodina spp.
  • CLASS MONOGONONTA
    • ORDER FLOSCULARIACEA
    • ORDER PLOIMIDA
      • Brachionus spp.
  • CLASS SEISONIDEA
    • Seison spp.
Links:
NEMERTEA 

Nemertea is the phylum of Ribbon worms.As of 2024, 34 species of Nemertea have been observed in iNaturalist in the US and 86 throughout the world.
  • CLASS ANOPLA
    • ORDER HETERONEMERTEA
      • Proboscis Worm (Parborlasia corrugatus)
    • ORDER PALEONEMERTEA
  • CLASS ENOPLA
    • SUBCLASS BDELLONEMERTINI
      • ORDER BDELLONEMERTEA
    • SUBCLASS HOPLONEMERTEA
      • ORDER MONOSTILIFERA
        • Paranemertes peregrina
      • ORDER POLYSTILIFERA
Links:
CYCLIOPHORA 

Symbion pandora is the only species in this phylum. It has been observed as a parasite of Norway Lobsters.
Links:
MICROGNATHOZOA 

The class Micrognathozoa contains a single species, Limnognathia maerski. As of 2024, the class has not been assigned to a phylum or given its own.
  • Limnognathia maerski
Links:
BRACHIOPODA 

Brachiopoda is the phylum of Lamp Shells.As of 2024, 9 species of Brachiopoda have been observed in iNaturalist in the US and 36 throughout the world.
  • SUBPHYLUM CRANIIFORMEA
    • Novocrania anomala
  • SUBPHYLUM LINGULIFORMEA
    • Lingula spp.
  • SUBPHYLUM PHORONIFORMEA
    • Phoronid Worms (Phoronis spp.)
  • SUBPHYLUM RHYNCHONELLIFORMEA
    • Rhynchonellata spp.
Links:

[ Previous Page ][ Next Page ]