Heteronemertea
Heteronemertea is a monophyletic order of about 500 species of nemertean worm. It contains genera such as Lineus and Cerebratulus, and includes the largest and most muscular nemerteans.
| Heteronemertea | |
|---|---|
 | |
| An example of Heteronemertea, the Parborlasia corrugatus | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Nemertea |
| Class: | Anopla |
| Order: | Heteronemertea Bürger, 1892 |
| Families | |
Almost all heteronemerteans have three primary body-wall muscle strata: an outer longitudinal, a middle circular, and an inner longitudinal. The lateral nerve cords are outside the circular muscle, as in palaeonemerteans, but separated from the epidermis by the usually well-developed outer longitudinal muscle.[1]
Illustration of Gorgonorhynchus repens, a species within the family Gorgonorhynchidae, discharging its proboscis in response to a perceived threat.
Taxonomy
Families within the order Heteronemertea include:[2]
- Baseodiscidae
- Cerebratulidae
- Gorgonorhynchidae
- Lineidae
- Mixolineidae
- Panorhynchidae
- Poliopsiidae
- Polybrachiorhynchidae
- Pussylineidae
- Riseriellidae
- Valenciniidae
References
- Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 261. ISBN 0-03-056747-5.
- http://www.marinespecies.org/aphia.php?p=taxdetails&id=122305
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