Acoela acrocentric adhesive glands alimentary system anastomose animal Antarctic anteriad anterior atrium auricle basement membrane brain bursal canal caudal cement glands centromere cilia cocoon commissures copulatory apparatus copulatory bursa cyanophilous diploid distal diverticula dorsal duct ecology ectal ectoparasitic ejaculatory duct eosinophilous eye false seminal vesicle female genital duct frontal genito-intestinal canal gonopore habitat habitus hemispherical holotype Horseshoe crab infranucleate karyology kingdom lanceolate lateral lateral bursa lens medial metacentric mouth musculo-parenchymatic organ nerve cords nucleate ovary oviduct paratype parenchyma penis bulb pharynx phylum pigment planarian Platyhelminthes posterior postocellar precerebral coecum preocellar proximal receptacular duct reproductive apparatus retinal cells rhabdites sagittal sclerotized section seminal vesicle Seriata spermiduct subepithelial testis transverse triclad turbellarian unicellular vas deferens ventral vestibulum vitellaria whole mount
A group (Order) of small turbellarians without a gut . The mouth enters directly into the parenchyma . A statocyst with a single statolith is usually present. Protonephridia absent.
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