Parahololepidella

Parahololepidella
Scientific classification
Kingdom:	Animalia
Phylum:	Annelida
Class:	Polychaeta
Order:	Phyllodocida
Family:	Polynoidae
Genus:	Parahololepidella; Pettibone, 1969
Type species
	Parahololepidella greeffi (Augener 1918)[1];

Parahololepidella is a genus of marine annelids in the family Polynoidae (scale worms). The genus contains a single species, Parahololepidella greeffi, This species is known from the east equatorial Atlantic Ocean and Cape Verde Islands at a maximum depth of 30m.[2]

Description

Species of Parahololepidella are long-bodied, with 130 or more segments and 60 or more pairs of elytra, which continue to the end of the body. The eyltra are smooth and very small, leaving most of the parapodia and dorsum uncovered. The neuropodia have a sub-acicular process, and the notochaetae are more slender than neurochaetae, none of which are bidentate. Cephalic peaks are also present on the prostomium.[3]

Description of Parahololepidella greeffi

Specifically, P. greeffi has 136 segments and 67 pairs of elytra. The dorsum is a greyish-yellow with a median purple band and there are dark spots near the base of the parapodia. The lateral antennae are inserted ventrally (beneath the prostomium and median antenna), and the notochaetae are thinner than the neurochaetae. Bidentate neurochaetae are also absent.[4]

Taxonomic comments

Parahololepidella is distinguished from other scale worms by the subacicular neuropodial process and having numerous (50–60 or more pairs) of very small elytra which only cover the base of the parapodium.[2]

Biology and Ecology

P. greeffi is a commensal organism. Its host are antipatharian corals in the genus Tanacetipathes.[4]

References

Read, G.; Fauchald, K. (Ed.) (2020). World Polychaeta database. Parahololepidella Pettibone, 1969. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=846000
Pettibone, Marian H. (1969). The genera Polyeunoa McIntosh, Hololepidella Willey, and three new genera (Polychaeta, Polynoidae). Proceedings of the Biological Society of Washington. 82: 43-62., available online at http://biodiversitylibrary.org/page/34595050
Fauchald, K.; Wilson, R.S. (2003). "Polynoidae (Polychaeta)-A DELTA database of genera, and Australian species". In R.S. Wilson; P.A. Hutchings; C. J. Glasby (eds.). Polychaetes: An Interactive Identification Guide. Melbourne: CSIRO Publishing.
Britayev TA, Gil J, Altuna Á, Calvo M, Martín D (2014) New symbiotic associations involving polynoids (Polychaeta, Polynoidae) from Atlantic waters, with redescriptions of Parahololepidella greeffi (Augener, 1918) and Gorgoniapolynoe caeciliae (Fauvel, 1913). Memoirs of Museum Victoria 71: 27–43. https://doi.org/10.24199/j.mmv.2014.71.04.

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[1] Read, G.; Fauchald, K. (Ed.) (2020). World Polychaeta database. Parahololepidella Pettibone, 1969. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=846000

[pettibone-2] Pettibone, Marian H. (1969). The genera Polyeunoa McIntosh, Hololepidella Willey, and three new genera (Polychaeta, Polynoidae). Proceedings of the Biological Society of Washington. 82: 43-62., available online at http://biodiversitylibrary.org/page/34595050

[3] Fauchald, K.; Wilson, R.S. (2003). "Polynoidae (Polychaeta)-A DELTA database of genera, and Australian species". In R.S. Wilson; P.A. Hutchings; C. J. Glasby (eds.). Polychaetes: An Interactive Identification Guide. Melbourne: CSIRO Publishing.

[britayev-4] Britayev TA, Gil J, Altuna Á, Calvo M, Martín D (2014) New symbiotic associations involving polynoids (Polychaeta, Polynoidae) from Atlantic waters, with redescriptions of Parahololepidella greeffi (Augener, 1918) and Gorgoniapolynoe caeciliae (Fauvel, 1913). Memoirs of Museum Victoria 71: 27–43. https://doi.org/10.24199/j.mmv.2014.71.04.