Astroides

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Astroides calycularis
Astroides calycularis 2008a.jpg
Astroides calycularis colony with tentacles expanded
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Cnidaria
Class: Hexacorallia
Order: Scleractinia
Family: Dendrophylliidae
Genus: Astroides
Quoy & Gaimard, 1827 [1]
Species:
A. calycularis
Binomial name
Astroides calycularis
(Pallas, 1766) [1]

Astroides is a genus of stony cup corals in the family Dendrophylliidae. It is monotypic and the only species is Astroides calycularis, which is endemic to the western Mediterranean Sea. The species was first described in 1766 by the German naturalist Peter Simon Pallas.

Contents

Description

Astroides calycularis is a colonial coral, consisting of a group of polyps, each of which sits in a stony cup known as a calyx. The colonies are 25 to 30 cm (10 to 12 in) in diameter and 10 cm (4 in) high and each polyp is about 1 to 2 cm (0.4 to 0.8 in) in diameter. The polyps are yellow or orange, each with a fringe of about thirty very short tentacles surrounding a slit-shaped mouth. The colony grows by asexual reproduction, new polyps budding off existing polyps and secreting their own calices. Deep-water colonies are bush-shaped, the calices are circular and budding occurs at various heights on the calyx walls. Shallow-water colonies tend to be ellipsoid in shape, the calyces are polygonal and budding occurs in the centre of the colony as well as round the edges. [2]

Distribution and habitat

A. calycularis Astroides calycularis Linosa 017.jpg
A. calycularis

During the Pleistocene, Astroides calycularis had a wider distribution than it does now, and was present in the whole of the western Mediterranean. Since then it has disappeared from the northern part of that range as a result of the lower sea temperatures that resulted from glaciation. [2] Nowadays it is native to the part of the western Mediterranean Sea that is south of Sardinia and is also present in the Atlantic Ocean near the Strait of Gibraltar. Before 1989 it was restricted to the area west of Sicily, but in that year it appeared in the Adriatic Sea for the first time. [3] This coincided with a sudden change of circulation in the eastern Mediterranean which may have allowed the short-lived pelagic larvae to survive long enough to settle on the seabed of the Croatian coast. [3] A. calycularis is found on rocks and walls, under overhangs and in submarine caves at depths down to about 70 m (230 ft). In suitable locations, colonies can cover 90% of the available substrate. [2] In a cave in Italy, it was more common in better lit parts than was the solitary sunset cup coral ( Leptopsammia pruvoti ), and was more abundant near where sulphurous spring water flowed into the cave. [4]

Biology

Astroides calycularis is nocturnal, the polyps remaining retracted back into their calices during the day. When expanded at night, they feed on zooplankton, small fish and perhaps bacteria. This coral is azooxanthellate, meaning it does not contain symbiotic dinoflagellates in its tissues as do many species of coral. [1]

A. calycularis colonies are gonochoristic with all the polyps in a colony being of the same sex. Males liberate sperm into the sea and fertilisation takes place in the coelenteron (gastric cavity) of the female. The eggs have yolks, and the embryos are brooded in the coelenteron until they are liberated into the water column as planula larvae. [2]

Related Research Articles

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Anthozoa is a class of marine invertebrates which includes the sea anemones, stony corals and soft corals. Adult anthozoans are almost all attached to the seabed, while their larvae can disperse as part of the plankton. The basic unit of the adult is the polyp; this consists of a cylindrical column topped by a disc with a central mouth surrounded by tentacles. Sea anemones are mostly solitary, but the majority of corals are colonial, being formed by the budding of new polyps from an original, founding individual. Colonies are strengthened by calcium carbonate and other materials and take various massive, plate-like, bushy or leafy forms.

<span class="mw-page-title-main">Scleractinia</span> Order of Hexacorallia which produce a massive stony skeleton

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<i>Balanophyllia europaea</i> Species of coral

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<i>Paramuricea clavata</i> Species of coral

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<i>Alcyonium coralloides</i> Species of coral

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<i>Leptopsammia pruvoti</i> Species of coral

Leptopsammia pruvoti, the sunset cup coral, is a solitary stony coral in the family Dendrophylliidae. It is an azooxanthellate species, meaning its tissues do not contain the symbiotic unicellular algae (zooxanthellae) of the genus Symbiodinium, as do most corals. It is native to the Mediterranean Sea. The species was described by Henri de Lacaze-Duthiers in 1897 and named to honor the French marine biologist Georges Pruvot.

<i>Turbinaria stellulata</i> Species of coral

Turbinaria stellulata, also known as disc coral, is a species of colonial stony coral in the family Dendrophylliidae. It is native to the Indo-Pacific region. The International Union for Conservation of Nature has rated its conservation status as being "vulnerable".

<i>Blastomussa wellsi</i> Species of coral

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<span class="mw-page-title-main">Euphylliidae</span> Family of marine coral known as Euphylliidae

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<i>Manicina areolata</i> Species of coral

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<i>Balanophyllia elegans</i> Species of coral

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<i>Tubastraea faulkneri</i> Species of coral

Tubastraea faulkneri, common name Orange sun coral, is a species of large-polyp stony corals belonging to the family Dendrophylliidae. Other common names of this coral are Orange Cup Coral, Sun Coral, Orange Polyp Coral, Rose Sun Coral, Golden Cup Coral, Sun Flower Coral, and Tube Coral.

References

  1. 1 2 3 Cairns, S.; Hoeksema, B. (2014). "Astroides Quoy & Gaimard, 1827". WoRMS. World Register of Marine Species . Retrieved 2014-12-23.
  2. 1 2 3 4 Goffredo, Stefano; Gasparini, Gabriella; Marconi, Giulia; Putignano, Maria Teresa; Pazzini, Claudia; Zaccanti, Francesco (2010). "Gonochorism and planula brooding in the Mediterranean endemic orange coral Astroides calycularis (Scleractinia: Dendrophylliidae). Morphological aspects of gametogenesis and ontogenesis". Marine Biology Research. 6 (5): 421–436. Bibcode:2010MBioR...6..421G. doi:10.1080/17451000903428488. S2CID   54773809.
  3. 1 2 Giulio Relini (10 June 2007). Biodiversity in Enclosed Seas and Artificial Marine Habitats: Proceedings of the 39th European Marine Biology Symposium, held in Genoa, Italy, 21-24 July 2004. Springer Science & Business Media. p. 12. ISBN   978-1-4020-6156-1.
  4. Aldemaro Romero Díaz (2009). Cave Biology: Life in Darkness. Cambridge University Press. p. 81. ISBN   978-0-521-82846-8.