Overview

Distribution

In the 1976-1986 period Branchiostoma lanceolatum was widely spread outside the near-coastal zone and reached densities of 600 ind./m2 maximally in that area. In the 1994-2001 period the distribution of the species was remarkably more limited and lower densities were observed: B. lanceolatum was exclusively found near the Hinder Banks in densities of maximum 120 ind./m2.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Description

The lancelet Branchiostoma lanceolatum is considered an invertebrate although the species bears quite some resemblance with ‘primitive fish’. It is possible to distinguish a head with a mouth surrounded by fine tentacles (used to gather food), a ‘body and a ‘tail’. The animal is covered with fins and manages to cover small distances by swimming; however, the lancelet is buried in coarse sediment most of the time.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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Source: World Register of Marine Species

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Ecology

Habitat

Branchiostoma lanceolatum clearly prefers coarse sediments: the relative occurrence in sediments with a median grain size of 600-650 µm amounts to 20%. The mud content of the sediment is always less than 10%.
  • Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 204 specimens in 1 taxon.
Water temperature and chemistry ranges based on 106 samples.

Environmental ranges
  Depth range (m): 0 - 108
  Temperature range (°C): 6.833 - 13.027
  Nitrate (umol/L): 1.032 - 12.040
  Salinity (PPS): 17.801 - 35.271
  Oxygen (ml/l): 5.996 - 6.734
  Phosphate (umol/l): 0.283 - 0.737
  Silicate (umol/l): 2.147 - 10.947

Graphical representation

Depth range (m): 0 - 108

Temperature range (°C): 6.833 - 13.027

Nitrate (umol/L): 1.032 - 12.040

Salinity (PPS): 17.801 - 35.271

Oxygen (ml/l): 5.996 - 6.734

Phosphate (umol/l): 0.283 - 0.737

Silicate (umol/l): 2.147 - 10.947
 
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: Branchiostoma lanceolatum

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


There are 20 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.

ACTCGGTGGTTATTTTCTACTAATCATAAAGACATTGGGACTTTATATTTCATTTTTGGAGCTTGGGCGGCTATGGTCGGGACTGCTATA---AGCCTATTAATTCGAGCTGAACTATCTCAGCCGGGAGCGCTACTGGGGGAT---GATCATTTGTATAATGTAATTGTCACGGCTCATGCATTTGTAATAATTTTCTTTATAGTAATACCAATTATGATTGGTGGATTTGGTAATTGGCTTGTCCCTATAATA---ATTGGGGCTCCAGATATGGCGTTTCCTCGTATAAATAACATGAGTTTCTGAATGTTACCTCCGTCTTTTTCTCTCCTGTTGGCTTCTTCTGCTGTGGAAGCTGGAGTAGGGACGGGATGAACTGTTTATCCTCCATTGTCAAGAAACATTGCGCATGCAGGGGCATCTGTCGATCTA---GCTATTTTTTCTTTACACCTAGCAGGTGTGTCGTCAATCTTAGGTGCTATCAATTTTATCACAACTATTCATAATATGCGTGCTAGC---ATTGAATGGAATCGCGTGCCTCTATTTGTGTGATCAATTTGGGTAACTGCTTATCTATTACTTTTGTCTTTACCTGTTTTGGCGGGA---GCCATTACTATATTGTTAACAGATCGTAATATTAATACTACCTTTTTTGATCCCTCAGGTGGTGGGGACCCTATTCTGTATGAGCATTTGTTTTGATTCTTTGGGCATCCGGAAGTATACATCTTGATCTTACCTGGGTTCGGCATTATTTCTCATATTATCATTCATTACGCAGGGAAGTTG---CGTTCTTTTGGTTACTTAGGAATAACTTGGGCTATATTTACTATTGGTTTGCTTGGTTTCTGGGTTTGGGCTCATCACATATTCACTGTAGGAATAGATGTCGATACACGGAGTTATTTCACTGCCGCTACTATGGTAATTGCAGTTCCAACAGGTATCAAGGTATTTAGTTGATTG---GCTACACTGTCAGGGTCTAAGCAGCTTAAGTGGGAAACACCTCTATTGTGAGCCCTAGGTTTTATTTTCTTGTTTACAGTAGGGGGATTAACTGGTATTGTTTTAGCTAATTCATCTTTAGATATTGTTCTTCATGATACTTATTATGTTGTAGCACACTTCCATTATGTT---TTATCAATAGGAGCGGTATTTTCTATTTTAGGAGGTTTGACTTACTGATTCCCTCTATTTACAGGTTTTACTTTACAGGAGTCGTGGGCAAAAGTCCATTTTTTTGTTATGTTCGTTGGGGTAAATTTAACTTTTTTCCCTCAGCATTTCTTAGGGTTAGCGGGTATACCACGA---CGGTATTCTGATTACCCGGATGCTTATACT---ATCTGGAATGTAATTTCGTCCTTAGGGTCAGTGATTTCTTTAGGTTCTGTAATTTTCTTTTTATTTATTTTGTGAGAGGCTTTCTCAGCACAACGACAGGCC---GTGCCAGCTAGTCATACTTCG---CAT
-- end --

Download FASTA File
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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Branchiostoma lanceolatum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 13
Specimens with Barcodes: 13
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Branchiostoma lanceolatum

Branchiostoma lanceolatum or amphioxus is a lancelet in the subphylum Cephalochordata. It is a marine invertebrate found in soft substrates in shallow seas. It is used as a model organism to study the development of vertebrates.[2] The mitochondrial genome has been sequenced.[3][4]

Contents

Description

Anatomical diagram of Branchiostoma lanceolatum

Branchiostoma lanceolatum has an elongated body, flattened laterally and pointed at both ends. A stiffening rod of tightly packed cells, the notochord, extends the whole length of the body. Above it is a nerve cord with a single frontal eye. The mouth is on the underside of the body and is surrounded by a tuft of 20 or 30 cirri or slender sensory appendages. The gut runs just below the notochord from the mouth to the anus, in front of the tail. There is a flap-like, vertical fin surrounding the pointed tail. Gas exchange takes place as water passes through gill slits in the mid region, and segmented gonads lie just behind these. The animal is pearly white and semi-transparent which enables the internal organs to be seen from outside. Its appearance is similar to a "primitive fish". It can grow up to 6 cm (2.5 in) long.[4][5]

Distribution and habitat

Branchiostoma lanceolatum is found in shallow seas in the north-east Atlantic Ocean, from Norway, Scotland[6][7] as well as further south to the Mediterranean Sea and the Black Sea. Its range has expanded through the Suez Canal to the northerly parts of the Indian Ocean and the coasts of East Africa. It burrows in soft substrates such as sand, gravel and shell fragments and is quite particular as to the size of the particles. It occurs from the low tide mark down to about 40 metres (130 ft).[5]

Biology

In the North Sea, breeding takes place in June and July. The mature adult Branchiostoma lanceolatum, aged 2 to 3 years, congregate in masses on the sea floor. Individuals are either male or female and spawn once a year. The eggs are laid and fertilisation takes place externally. The early larval stages take place in the substrate but a little later, the larvae become pelagic. They are elongated and flattened laterally and have a swollen region around the gill slits. These slits number 6 to 19, the number increasing as the larva passes through its various stages. The larvae have a vertical daily migration. Each evening they rise to near the surface of the sea and in the morning they sink through the water column, feeding on phytoplankton, copepods and detritus as they descend. While in these surface waters they drift with the current. The larval stage lasts for up to 200 days.[5]

Research

The mitochondrial genome of Branchiostoma lanceolatum has been sequenced, and the species serves as a model organism for studying the development of vertebrates.[2] The way the coding genes and the two rRNA genes are organised is the same as the organisational method used by the sea lamprey (Petromyzon marinus). These data, among others, suggest a close relationship between amphioxus and the vertebrates.[3]

For use as a model organism, breeding can now be done in the laboratory. Adults can be induced to spawn by experiencing a thermal shock and can be encouraged to spawn several times a year. Metamorphosis in the lab took place in 1 to 3 months.[4]

References

  1. ^ a b Branchiostoma lanceolatum (Pallas, 1774) World Register of Marine Species. Retrieved 2011-11-14.
  2. ^ a b Theodosiou, M.; Colin, A.; Schulz, J.; Laudet, V.; Peyrieras, N.; Nicolas, J. F. O.; Schubert, M.; Hirsinger, E. (2011). "Amphioxus spawning behavior in an artificial seawater facility". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution 316B (4): 263–275. doi:10.1002/jez.b.21397. PMID 21271675.  edit
  3. ^ a b Spruyt, Nathalie, Christiane Delarbre, Gabriel Gachelin and Vincent Laudet (1998). "Complete sequence of the amphioxus (Branchiostoma lanceolatum) mitochondrial genome: relations to vertebrates". Nucleic Acids Research 26 (13): 3279–3285. doi:10.1093/nar/26.13.3279. PMC 147690. PMID 9628930. 
  4. ^ a b c The Mediterranean amphioxus, Branchiostoma lanceolatum, an emergent animal model for Evo-Devo studies. Retrieved 2011-11-14.
  5. ^ a b c Branchiostoma lanceolatum Marine Species Information Portal. Retrieved 2011-11-14.
  6. ^ Giant Mussel and 'Faceless Fish' amongst Scottish marine finds, WWF Scotland, 2011-12-29, retrieved 2012-12-27 
  7. ^ Marine surveys record 'brainless fish' off Orkney, BBC News Online, 2011-12-28, retrieved 2012-12-27 
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