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Echiuran

Echiuran
Echiuran
The Echiura, or spoon worms, have a pear shaped, non-segmented body and a large and non-retractile proboscis. In the anterior ventral region there is a pair of setae or hooks. They live in burrows in sand, mud, corals and coral crevices. Some species are found inside the tests of dead sand dollars and between the shells of dead bivalves. There is strong evidence that echiurans are in fact modified annelids.
The Echiura, or spoon worms, have a pear shaped, non-segmented body and a large and non-retractile proboscis. In the anterior ventral region there is a pair of setae or hooks. They live in burrows in sand, mud, corals and coral crevices. Some species are found inside the tests of dead sand dollars and between the shells of dead bivalves. There is strong evidence that echiurans are in fact modified annelids.
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Size
Taxa: Echiura
Experts: Antonio Sérgio Ferreira Ditadi
Date: May 21, 2002, midnight
Place: Caraguatatuba, SP, Brazil
Geolocation: S 23°42'2" W 45°14'26"
. Echiuran. Cifonauta image database. Available at: http://cifonauta.cebimar.usp.br/media/4923/ Accessed: 2019-11-12.
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16 images

References

2007 Struck TH, Schult N, Kusen T, Hickman E, Bleidorn C, McHugh D, Halanych KM. Annelid phylogeny and the status of Sipuncula and Echiura.. BMC evolutionary biology, 7: 57, doi:10.1186/1471-2148-7-57, pmid:17411434, url:http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1855331&tool=pmcentrez&rendertype=abstract
1999 Ditadi ASF. Echiura. Biodiversidade do Estado de São Paulo, Brasil: síntese do conhecimento ao final do século XX, 3: invertebrados marinhos: 148-153, url:http://www.biota.org.br/pdf/v3cap22.pdf