Acoela
E460531
Acoela are simple, small, worm-like marine animals lacking a true gut, considered among the most basal and primitive bilaterian animals.
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
bilaterian
ⓘ
clade ⓘ worm-like animal ⓘ |
| anus | absent ⓘ |
| bodyPlan | acoelomate ⓘ |
| bodyShape | small flattened worms ⓘ |
| bodySize | typically less than 5 mm long ⓘ |
| bodySymmetry | bilateral symmetry ⓘ |
| contains |
genus Convoluta
ⓘ
genus Symsagittifera NERFINISHED ⓘ numerous small meiofaunal species ⓘ |
| development | direct development without typical larval stage in many species ⓘ |
| diet |
microalgae
ⓘ
organic detritus ⓘ small invertebrates ⓘ |
| digestiveOpening | single mouth opening ⓘ |
| digestiveSystem | syncytial digestive vacuole ⓘ |
| distinguishedFromPlatyhelminthesBy |
different organization of nervous system
ⓘ
lack of protonephridia ⓘ molecular phylogenetic evidence ⓘ |
| epidermis | ciliated epidermis ⓘ |
| evolutionarySignificance | important for understanding early bilaterian evolution ⓘ |
| excretorySystem | lacks protonephridia ⓘ |
| feedingType |
detritivores
ⓘ
micro-predators ⓘ |
| fertilization | internal fertilization ⓘ |
| geographicDistribution | worldwide in marine environments ⓘ |
| germLayers | triploblastic ⓘ |
| habitat |
benthic environments
ⓘ
interstitial spaces in marine sediments ⓘ marine ⓘ |
| hasBodyCavity | no true body cavity ⓘ |
| hasBrain | no true brain ⓘ |
| hasCirculatorySystem | absent ⓘ |
| hasGut | no true gut ⓘ |
| hasRespiratorySystem | absent ⓘ |
| kingdom | Animalia ⓘ |
| locomotion | ciliary gliding ⓘ |
| musculature | well-developed body-wall muscles ⓘ |
| nervousSystem | simple nervous system ⓘ |
| nervousSystemOrganization | anterior concentration of neurons ⓘ |
| phylum | Xenacoelomorpha NERFINISHED ⓘ |
| positionInBilateria | among the most basal bilaterian animals ⓘ |
| previouslyClassifiedAs |
Acoelomorpha
NERFINISHED
ⓘ
order of Platyhelminthes ⓘ |
| reproduction |
asexual reproduction by fission in some species
ⓘ
sexual reproduction ⓘ |
| researchUse |
model for studying body plan evolution
ⓘ
model for studying nervous system evolution ⓘ |
| symbiosis | some species host symbiotic algae ⓘ |
| taxonomicRank | subphylum-level group (historical usage) ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.