Scalibregma inflatum

Scalibregma inflatum
	S. inflatum under stereo microscope
Scientific classification
Kingdom:	Animalia
Phylum:	Annelida
Class:	Polychaeta
Family:	Scalibregmatidae; Malmgren, 1867
Genus:	Scalibregma; Rathke, 1843
Species:	S. inflatum
Binomial name
	Scalibregma inflatum; Rathke, 1843

Scalibregma inflatum, also known as T headed worm, is a burrowing marine polychaete. It is a cosmopolitan species that can be found from the Arctic to Antarctica, although most probably several species are confounded.[1]

Morphology

Up to 6 cm long with an orange body with 50–60 segments. Body is composed of a wide anterior part of segments 15–17 and a long slim posterior part. Prostomium rectangular shaped with two lateral horns making it appear as a T. peristomium without chaetae. Parapodia small and oval at first increasing in size from segments 16–18. Four pairs of branching gills dorsally on 2-5 segment with chaetae.[2][3]

Ecology

Mainly found in muddy substrate, but can also be found in sand and between stones and shells. S. inflatum is a deposit feeder. During the spawning period S. inflatum undergoe epitoky.[2][3]

Systematics

Scalibregma inflatum is found within the polychaete family Scalibregmatidae.[4] The genus Scalibregma is composed of 15 different species.[5]

References

Bakken, T.; E. Oug; J.A. Kongsrud (2014). "Occurrence and distribution of Pseudoscalibregma and Scalibregma (Annelida, Scalibregmatidae) in the deep Nordic Seas, with the description of Scalibregma hanseni". Zootaxa. 3753 (2): 101–117. doi:10.11646/zootaxa.3753.2.1. hdl:11250/217143. PMID 24872283.
Kirkegaard, J. B. (1996). Havbørsteorme II. Danmarks Fauna. 86. pp. 241–242.
Hayward, P. J. & Ryland, J. S. (1995). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. p. 224.
Bellan, G. (2008). Read G, Fauchald K (eds.). "Scalibregma inflatum Rathke, 1843". World Polychaeta database. World Register of Marine Species. Retrieved 22 December 2016.
Bellan, G. (2008). Read G, Fauchald K (eds.). "Scalibregma Rathke, 1843". World Polychaeta database. World Register of Marine Species. Retrieved 22 December 2016.

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[1] Bakken, T.; E. Oug; J.A. Kongsrud (2014). "Occurrence and distribution of Pseudoscalibregma and Scalibregma (Annelida, Scalibregmatidae) in the deep Nordic Seas, with the description of Scalibregma hanseni". Zootaxa. 3753 (2): 101–117. doi:10.11646/zootaxa.3753.2.1. hdl:11250/217143. PMID 24872283.

[DKfauna-2] Kirkegaard, J. B. (1996). Havbørsteorme II. Danmarks Fauna. 86. pp. 241–242.

[MarineFauna-3] Hayward, P. J. & Ryland, J. S. (1995). Handbook of the Marine Fauna of North-West Europe. Oxford University Press. p. 224.

[WoRMS-4] Bellan, G. (2008). Read G, Fauchald K (eds.). "Scalibregma inflatum Rathke, 1843". World Polychaeta database. World Register of Marine Species. Retrieved 22 December 2016.

[5] Bellan, G. (2008). Read G, Fauchald K (eds.). "Scalibregma Rathke, 1843". World Polychaeta database. World Register of Marine Species. Retrieved 22 December 2016.