Dalyelliidae

Dalyelliidae
Dalyelliid flatworm
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Order: Rhabdocoela
Parvorder: Limnotyphloplanida
Family: Dalyelliidae

Dalyelliidae is a family of flatworms belonging to the order Rhabdocoela.[1] The family Dalyelliidae represents the most diverse group within the Dalyellioida.[2] Although a number of species also inhabit marine and brackish waters, the majority are free-living in freshwater environments.[2] Notably, the only known taxon to exhibit symbiotic habits in a broad sense is the Varsoviella.[2]

Genera

As of 2007, Dalyelliidae included 16 genera, ten of which are confined to freshwater habitats:[2][3][4]

  • Austrodalyellia Hochberg & Cannon, 2002
  • Castrella Fuhrmann, 1900
  • Dalyellia Gieysztor, 1938
  • Fulinskiella Gieysztor & Szynal, 1939
  • Gieysztoria Ruebush & Hayes, 1939
  • Haplodidymos Hochberg & Cannon, 2002
  • Microdalyellia Gieysztor, 1938
  • Sergia Nasonov, 1923
  • Varsoviella, Gieysztor & Wisniewski, 1947
  • Vaillantiella Luther, 1955

Other Genera include:

  • Alexlutheria Karling, 1956
  • Axiola Luther, 1955

Among these, the genera with the highest numbers of species and the widest distribution are Gieysztoria (approximately 75 species), Microdalyellia (42 species), and Dalyellia (11 species), the remaining genera are more limited.[2]

Distribution

The neotropical region

Within the Neotropical region, Gieysztoria is the most specious genus, with 24 described species.[2] These taxa exhibit differences in male stylet morphology compared to their European counterparts, with Neotropical species showing greater structural complexity.[2] Other genera in this region are poorly represented: Dalyellia (one species), Microdalyellia (three species), and Sergia (one species).[2]

Argentina

In Argentina, seven species of Gieysztoria have been recorded: G. santafeensis, G. quadrata, G. coronae, G. tigrensis, G. pseudodiadema, G. variata, and G. falx.[2] Additionally, a single species of Microdalyellia (M. fairchildi) and one species of Dalyellia (D. obscura) are known.[2]

References

  1. ^ "Dalyelliidae". www.gbif.org. Retrieved 13 May 2021.
  2. ^ a b c d e f g h i j Damborenea, Cristina; Brusa, Francisco; Noreña, Carolina (August 2007). "New Dalyelliidae (Platyhelminthes, Rhabditophora) from Buenos Aires Province, Argentina, and Their Stylet Ultrastructure". Zoological Science. 24 (8): 803–810. doi:10.2108/zsj.24.803. ISSN 0289-0003. PMID 18217487.
  3. ^ "Dalyelliidae". www.gbif.org. Retrieved 13 May 2021.
  4. ^ "Dalyelliidae". Turbellarian taxonomic database. Archived from the original on 2021-05-15. Retrieved 2021-05-15.
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