Physical Description

Diagnostic Description

Description

Also distributed in New Caledonia (Clark, 1954); Maldive area, Bay of Bengal , East Indies, north Australia, Philippines, China, south Japan, South Pacific Is. and Hawaiian Is. (Clark & Rowe, 1971); Australia (Rowe & Gates, 1995). Ecology: benthic, inshore, continental shelf. General distribution: tropical, east Indo-Pacific Ocean, depth range 0-60 m. (Rowe & Gates, 1995).
  • Clark, A.M. and F.W.E. Rowe. (1971). Monograph of Shallow-water Indo-West Pacific Echinoderms. Trustees of the British Museum (Natural History): London. x + 238 p. + 30 pls.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Ecology

Habitat

Depth range based on 15 specimens in 1 taxon.
Water temperature and chemistry ranges based on 3 samples.

Environmental ranges
  Depth range (m): 0.15 - 8
  Temperature range (°C): 26.919 - 28.757
  Nitrate (umol/L): 0.068 - 1.161
  Salinity (PPS): 34.105 - 34.943
  Oxygen (ml/l): 4.571 - 4.709
  Phosphate (umol/l): 0.110 - 0.254
  Silicate (umol/l): 1.806 - 3.225

Graphical representation

Depth range (m): 0.15 - 8

Temperature range (°C): 26.919 - 28.757

Nitrate (umol/L): 0.068 - 1.161

Salinity (PPS): 34.105 - 34.943

Oxygen (ml/l): 4.571 - 4.709

Phosphate (umol/l): 0.110 - 0.254

Silicate (umol/l): 1.806 - 3.225
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Archaster typicus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 2 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

AGACGATGATTTTTTTCTACTAAACACAAGGATATTGGTACACTTTATCTTATATTTGGAGCTTGAGCTGGTATGGTAGGAACAGCAATGAGAGTTATAATACGAACAGAACTAGCCCAACCCGGATCTCTATTACAAGAC---GATCAAATATACAAAGTCATAGTTACTGCTCACGCCCTAGTAATGATATTCTTTATGGTAATGCCCATCATGATAGGAGGCTTTGGTAATTGACTAATTCCACTAATGATTGGAGCACCCGACATGGCCTTCCCCCGAATGAATAAAATGAGCTTTTGACTTATCCCCCCTTCTTTTCTTCTCTTACTTGCTTCCGCAGGGGTAGAAAGT---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------GGC
-- end --

Download FASTA File
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Archaster typicus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 7
Species With Barcodes: 1
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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Archaster typicus

Archaster typicus is a species of starfish in the family Archasteridae. It is commonly known as the sand star or the sand sifting star but these names are also applied to starfish in the genus Astropecten. It is found in shallow waters in the Indo-Pacific region.

Contents

Description

Archaster typicus is a five-limbed star with long, slightly tapering arms with pointed tips. Occasionally three, four, or even six-armed individuals occur. Adults grow to 12 to 15 centimetres (4.7 to 5.9 in) in diameter, with males often being smaller than females. This starfish is adapted to life on the sandy seabed, where it buries in the sediment during high tides and moves over the sediment surface during low tides.[2] The general colour is grey or brownish, variously marked with darker and lighter patches, sometimes forming a chevron pattern. The underside is pale. The body is slightly inflated and there is a whitish madreporite near the centre of the disc. The small armour plates that cover the upper surface of the arms are lined up in neat parallel rows which distinguishes it from the rather similar Astropecten polyacanthus which has similar habits and colouring. The spines, arranged in a marginal fringe, are short, flat and blunter than A. polyacanthus and the tube feet have suckers and not points.[3][4]

Distribution and habitat

Archaster typicus is found in the western Indian Ocean and the Indo-Pacific at depths down to 60 metres (200 ft). The range includes the Maldive Islands, the Bay of Bengal, Singapore, northern Australia, New Caledonia, the Philippines, China, southern Japan and Hawaii. It usually inhabits areas of the seabed with soft sediments including sand, silt and seagrass meadows.[1][4] Larval settlement occurs among mangroves, while individuals gradually move to seagrass and sandy habitats as they age.[2]

Feeding

Archaster typicus is a detritivore and eats detritus and anything else edible it comes across. To feed, it everts its stomach through its mouth which is situated centrally on its underside. The food item is engulfed and brought inside the starfish when its stomach is returned to its normal position.[4]

Reproduction

Like other starfish, Archaster typicus is a broadcast spawner, the male and female starfish each liberate their gametes into the sea where fertilisation takes place. However, in contrast to most other starfish, Archaster typicus performs pseudocopulation. Specimens reach sexual maturity at a radius of 29 mm.[5] About two months ahead of spawning the starfish begin to congregate, with males in particular becoming more mobile. A starfish can tell whether another is male or female, probably by chemotactic recognition. On recognizing a female, the male will climb on top of her and may remain there for two months. The female can move about and feed but the male is more restricted in his activities. During this time they synchronize their gonadal activity so that when the female is ready to spawn, so is the male. When she releases her eggs, he releases his sperm almost simultaneously thereby increasing the chances that successful fertilisation will take place.[6][7] Mating occurs in September and October in the Philippines and pair densities reach up to 7 pairs per square meter during full moon, whereas during new moon none are found.[5]

References

  1. ^ a b c Mah, Christopher (2010). "Archaster typicus Müller & Troschel, 1840". In C. L. Mah. World Asteroidea database. World Register of Marine Species. http://www.marinespecies.org/aphia.php?p=taxdetails&id=213119. Retrieved 2012-04-08.
  2. ^ a b Bos, A. R.; Gumanao, G. S.; van Katwijk, M. M.; Mueller, B.; Saceda, M. M.; Tejada, R. P. (2011). "Ontogenetic habitat shift, population growth, and burrowing behavior of the Indo-Pacific beach star Archaster typicus (Echinodermata: Asteroidea)". Marine Biology 158: 639–648. doi:10.1007/s00227-010-1588-0. 
  3. ^ Telling Apart Sand Stars: Archaster vs. Astropecten! Two Common Trade Species Echinoblog. Retrieved 2012-04-08.
  4. ^ a b c Common Sea Star – Archaster typicus WildSingapore. Retrieved 2012-04-08.
  5. ^ a b Bos AR, GS Gumanao, B Mueller, MM Saceda (2013). "Size at maturation, sex differences, and pair density during the mating season of the Indo-Pacific beach star Archaster typicus (Echinodermata: Asteroidea) in the Philippines". Invertebrate Reproduction and Development 57 (2): 116–122. doi:10.1080/07924259.2012.689264. 
  6. ^ Run, J. Q.; Chen, C. P.; Chang, K. H.; Chia, F. S. (1988). "Mating behaviour and reproductive cycle of Archaster typicus (Echinodermata: Asteroidea)". Marine Biology 99 (2): 247–253. doi:10.1007/BF00391987. 
  7. ^ The Sex Life of Archaster! Pseudocopulation in Sand Stars! Echinoblog. Retrieved 2012-04-08.
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