Slender sea pen
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Cnidaria
Class: Octocorallia
Order: Pennatulacea
Family: Virgulariidae
Genus: Virgularia
Species:
V. mirabilis
Binomial name
Virgularia mirabilis
Muller 1776

The slender sea pen (Virgularia mirabilis) is a species of sea pen in the family Virgulariidae, occurring throughout the Mediterranean and Western Europe, with some colonies being found on islands in the Mid-Atlantic.

Description

The slender sea pen stands upright in fine sediments.[1] Their peduncles are buried underneath the sediment, while their raches extend into the water column.[2] Due to their location in fine sediments, they are known to be able to withdraw into the sediment very quickly.[3] They are able to reach up to 60 cm in length.[4]

It forms elongated and slender colonies, with polyps living on attached side branches.[5] The polyps that form on the slender sea pen are able to form groups as large as 16 on each branch, with the central stem being only a few millimeters thick.[4] The slender sea pen's color ranges from white, to beige, to a light yellow. Research shows that the nerve net in the slender sea pen seems to be well-developed.[6]

Habitat and distribution

The slender sea pen is able to live in both shallow, sheltered locations, as well as up to depths of 400 m.[4] The species is located primarily in the waters of Western Europe, but has also been found in the waters of the Mediterranean and the Mid-Atlantic.[7]

In the Mediterranean, research has shown that the slender sea pen is mainly limited to the continental northern shelves.[8] They are known to have been found farther west, having been located as far as the Azores in the Mid-Atlantic.[9]

In Western Europe, the slender sea pen is commonly found along all the coasts of the British Isles. It is one of the most abundant and widespread of all the British sea pen species, as it has a tolerance to a wide variety of sediments, salinities, and temperatures.[10] In surveys completed off the coast of the western coast of Scotland, the slender sea pen has shown to prefer salinity from 27 to 35, muddy sediments with low percentage of gravel, and depths from 5 to 200 m.[11]

Ecology

Slender sea pens typically feed on zooplankton and other organic particles, however they also have been known to feed upon small animals that have been swept into their branches. They possess nematocysts, so the species is capable of both passive predation of small animals and suspension feeding of particles. The species is primarily a passive carnivore, but will also suspension feed when particles become trapped in the mucus on the ends of their branches.[1]

Slender sea pens are not associated with many other fauna. Due to their ability to retract into the sediment, they are not very suitable for epizoic organisms to sit on[12]

Reproduction

The sexes are separate, with each colony of polyps being either male or female.[1] Each colony will remain the same sex for their entire life span.[1] The frequency of their reproduction is annually episodic, with reproduction happening between June and October.[1] The larvae have the ability to disperse over a length of 10 km.[1] Little other information is known about the reproductive cycles of slender sea pen, though research inter similar species suggests that up to 200,000 eggs could be produced per female colony.[1]

References

  1. 1 2 3 4 5 6 7 "MarLIN - The Marine Life Information Network - Slender sea pen (Virgularia mirabilis)". www.marlin.ac.uk. Retrieved 2020-04-06.
  2. ↑ Soong, Keryea (April 2005). "Reproduction and colony integration of the sea pen Virgularia juncea". Marine Biology. 146 (6): 1103–1109. doi:10.1007/s00227-004-1509-1. ISSN 0025-3162. S2CID 84765183.
  3. ↑ Ruiz-Pico, Susana; Serrano, Alberto; Punzón, Antonio; Altuna, Álvaro; Fernández-Zapico, Olaya; Velasco, Francisco (2017-09-21). "Sea pen (Pennatulacea) aggregations on the northern Spanish shelf: distribution and faunal assemblages". Scientia Marina. 81 (3): 413–423. doi:10.3989/scimar.04359.06A. hdl:10508/11159. ISSN 1886-8134.
  4. 1 2 3 "Slender Sea Pen - Virgularia mirabilis". www.seawater.no. Retrieved 2020-04-06.
  5. ↑ "Virgularia mirabilis - Marine Life Encyclopedia". www.habitas.org.uk. Retrieved 2020-04-06.
  6. ↑ Shelton, G.A. (1975). "Colonial conduction systems in the Anthozoa: Octocorallia". The Journal of Experimental Biology. 62 (3): 571–8. doi:10.1242/jeb.62.3.571. PMID 1458.
  7. ↑ "WoRMS - World Register of Marine Species - Virgularia mirabilis (Müller, 1776)". www.marinespecies.org. Retrieved 2020-04-06.
  8. ↑ Bastari, Azzurra; Pica, Daniela; Ferretti, Francesco; Micheli, Fiorenza; Cerrano, Carlo (2018-10-01). Kaiser, Michel (ed.). "Sea pens in the Mediterranean Sea: habitat suitability and opportunities for ecosystem recovery". ICES Journal of Marine Science. 75 (5): 1722–1732. doi:10.1093/icesjms/fsy010. ISSN 1054-3139.
  9. ↑ Sampaio, Íris; Freiwald, Andre; Mora, Filipe Porteiro; Menezes, Gui; Carreiro-Silva, Marina (2019-01-29). "Census of Octocorallia (Cnidaria: Anthozoa) of the Azores (NE Atlantic) with a nomenclature update". Zootaxa. 4550 (4): 451–498. doi:10.11646/zootaxa.4550.4.1. ISSN 1175-5334. PMID 30790828.
  10. ↑ Greathead, Clare F.; Donnan, David W.; Mair, James M.; Saunders, Graham R. (October 2007). "The sea pens Virgularia mirabilis , Pennatula phosphorea and Funiculina quadrangularis : distribution and conservation issues in Scottish waters". Journal of the Marine Biological Association of the United Kingdom. 87 (5): 1095–1103. doi:10.1017/S0025315407056238. ISSN 0025-3154. S2CID 86843868.
  11. ↑ Greathead, C.; González-Irusta, J. M.; Clarke, J.; Boulcott, P.; Blackadder, L.; Weetman, A.; Wright, P. J. (2015-01-01). "Environmental requirements for three sea pen species: relevance to distribution and conservation". ICES Journal of Marine Science. 72 (2): 576–586. doi:10.1093/icesjms/fsu129. hdl:10508/14990. ISSN 1095-9289.
  12. ↑ De Clippele, L.H.; Buhl-Mortensen, P.; Buhl-Mortensen, L. (August 2015). "Fauna associated with cold water gorgonians and sea pens". Continental Shelf Research. 105: 67–78. doi:10.1016/j.csr.2015.06.007.
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