Catenulida

[kə‚ten·yə′lī·də]

(invertebrate zoology)

An order of threadlike, colorless fresh-water rhabdocoeles with a simple pharynx and a single, median protonephridium.

Mentioned in ?

Rhabdocoela

References in periodicals archive ?

Acoelomorpha, Catenulida e Rhabditophora (Rieger et al., 1991), since Rhabditophora also includes the parasitic forms.

They are distributed into the following taxa: Acoela, Nemertodermatida, Catenulida, Macrostomida, Polycladida, Prolecithophora, Lecithoepitheliata, Revertospermata, Proseriata, Tricladida, Dalytyphloplanida and Kalyptorhynchia (Schockaert et al., 2008; Van Steenkiste et al., 2013).

The following key-words were used: Platyhelminthes, Acoela, Nemertodermatida, Catenulida, Prolecithophora, Rhabdocoela, Temnocephalida, Macrostomida, Lecithoepitheliata or Revertospermata and Brazil.

Dalytyphloplanida and Catenulida are the most species-rich, with about 28% and 18% of the recorded species, respectively, followed by Acoela (15%), Prolecithophora (11%), Proseriata (10%), Kalyptorhynchia (9%), and Macrostomida (7%).

Microturbellarians (Platyhelminthes and Acoelomorpha) in Brazil: invisible organisms?/Microturbelarios (Platyhelminthes e Acoelomorpha) no Brasil: organismos invisiveis?

Although adult morphology varies vastly across the group, many core Lophotrochozoa (including the Mollusca, Annelida [including Vestimentifera, Pogonophora, and Echiura, and possibly Myzostoma, and Sipunculida], Gnathostomulida, Nemertea, dicyemid Mesozoa, Entoprocta, and some Platyhelminthes [including polyclad Turbellaria, Catenulida, and Macrostomida]) exhibit spiral cleavage, a highly conserved pattern of early development.

The slipper snail, Crepidula: an Emerging lophotrochozoan model system[dagger]

Evolution of body-wall musculature in the platyhelminthes (Acoela, Catenulida, Rhabditophora).

Morphology of the muscle articulation joint between the hooks of a flatworm (Kalyptorhynchia, Cheliplana sp.)

The modern concept of Platyhel-minthes comprises only Catenulida and Rhabditophora and places the group in the Lophotrochozoa or Spiralia (Giribet et al., 2007; Dunn et a., 2008).

How did indirect development with planktotrophic larvae evolve?

Molecular analyses that include other lower turbellarian groups (for example, the Catenulida and the Nemertodermatida) and the Orthonectida, a group tentatively included in the Mesozoa, will provide further information for understanding the phylogenetic position of the dicyemids.

Phylogenetic position of the dicyemid mesozoa inferred from 18s rDNA sequences

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