Bloodworms
Glycera sp.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Annelida
Clade: Pleistoannelida
Subclass: Errantia
Order: Phyllodocida
Family: Glyceridae
Genus: Glycera
Savigny, 1818
Species

Many, see text

The genus Glycera is a group of polychaetes (bristle worms) commonly known as bloodworms. They are typically found on the bottom of shallow marine waters, and some species (e.g. common bloodworms) can grow up to 35 cm (14 in) in length.

Although both are visually similar and commonly used as fishing bait, bloodworms are biologically distinct from lugworms.

Anatomy

Bloodworms have a creamy pink color, as their pale skin allows their red body fluids that contain haemoglobin to show through. This is the origin of the name "bloodworm". At the 'head', bloodworms have four small antennae and small fleshy projections called parapodia running down their bodies.[1][2] Bloodworms can grow up to 35 centimetres (14 in) in length.

Bloodworms are carnivorous. They feed by extending a large proboscis that bears four hollow jaws. The jaws are connected to glands that supply venom which they use to kill their prey, and their bite is painful even to a human. They are preyed on by other worms, bottom-feeding fish, crustacea, and gulls.

Reproduction occurs in midsummer, when the warmer water temperature and lunar cycle among other factors triggers sexually mature worms to transform into a non-feeding stage called the epitoke. With enlarged parapodia, they swim to the surface of the water where both sexes release gametes, and then die.

The first stage in many forms of bloodworm is a zooplanktonic stage followed by the benthic instar where the familiar segmented red larvae develop protected by silk tubes made in the bottom silt. These larvae progress from tiny pale opaque worms to the larger red larvae of 3 to 10 centimeters in length or longer over a period as short as 2–3 weeks in optimum conditions.[3]

These animals are unique in that they contain a lot of copper without being poisoned. Their jaws are unusually strong since they too contain the metal in the form of a copper-based chloride biomineral, known as atacamite,[4] in crystalline form.[5] It is theorized that this copper is used as a catalyst for its venomous bite. In Glycera dibranchiata, the jaws are a composite of melanin and 10% copper.[6]

Systematics

Glycera is the type genus of the family Glyceridae. It contains the following species as of October 2023:[7]

  • Glycera africana Arwidsson, 1899
  • Glycera alba (O.F. Müller, 1776)
  • Glycera amadaiba Imajima, 2003
  • Glycera amboinensis McIntosh, 1885
  • Glycera americana Leidy, 1855
  • Glycera asymmetrica Day, 1973
  • Glycera baltica (Eisenack, 1939) †
  • Glycera bassensis Böggemann & Fiege, 2001
  • Glycera benguellana Augener, 1931
  • Glycera benhami Böggemann & Fiege, 2001
  • Glycera branchiopoda Moore, 1911
  • Glycera brevicirris Grube, 1870
  • Glycera calbucoensis Hartmann-Schröder, 1962
  • Glycera capitata Örsted, 1842
  • Glycera carnea Blanchard in Gay, 1849
  • Glycera celtica O'Connor, 1987
  • Glycera chirori Izuka, 1912
  • Glycera cinnamomea Grube, 1874
  • Glycera decipiens Marenzeller, 1879
  • Glycera dentribranchia Lee, 1985
  • Glycera derbyensis Hartmann-Schröder, 1979
  • Glycera dibranchiata Ehlers, 1868
  • Glycera diva Böggemann, 2009
  • Glycera dubia (Blainville, 1825)
  • Glycera ehlersi Arwidsson, 1899
  • Glycera fallax Quatrefages, 1850
  • Glycera fundicola Chamberlin, 1919
  • Glycera gilbertae Böggemann & Fiege, 2001
  • Glycera glaucopsammensis Charletta & Boyer, 1974 †
  • Glycera guatemalensis Böggemann & Fiege, 2001
  • Glycera guinensis Augener, 1918
  • Glycera hasidatensis Izuka, 1912
  • Glycera heteropoda Hartmann-Schröder, 1962
  • Glycera incerta Hansen, 1882
  • Glycera juliae Magalhães & Rizzo, 2012
  • Glycera kerguelensis McIntosh, 1885
  • Glycera knoxi Kirkegaard, 1995
  • Glycera lamelliformis McIntosh, 1885
  • Glycera lancadivae Schmarda, 1861
  • Glycera lapidum Quatrefages, 1866
  • Glycera longipinnis Grube, 1878
  • Glycera macintoshi Grube, 1877
  • Glycera macrobranchia Moore, 1911
  • Glycera madagascariensis Böggemann & Fiege, 2001
  • Glycera mauritiana Grube, 1870
  • Glycera mexicana (Chamberlin, 1919)
  • Glycera micrognatha Schmarda, 1861
  • Glycera nana Johnson, 1901
  • Glycera natalensis Day, 1957
  • Glycera neorobusta Imajima, 2009
  • Glycera nicobarica Grube, 1866
  • Glycera noelae Böggemann, Bienhold & Gaudron, 2012
  • Glycera okai Imajima, 2009
  • Glycera onomichiensis Izuka, 1912
  • Glycera ovigera Schmarda, 1861
  • Glycera oxycephala Ehlers, 1887
  • Glycera pacifica Kinberg, 1866
  • Glycera papillosa Grube, 1857
  • Glycera pilicae Szaniawski, 1974 †
  • Glycera polygona Risso, 1826
  • Glycera posterobranchia Hoagland, 1920
  • Glycera profundi Chamberlin, 1919
  • Glycera prosobranchia Böggemann & Fiege, 2001
  • Glycera pseudorobusta Böggemann & Fiege, 2001
  • Glycera robusta Ehlers, 1868
  • Glycera russa Grube, 1870
  • Glycera rutilans Grube in McIntosh, 1885
  • Glycera sagittariae McIntosh, 1885
  • Glycera semibranchiopoda Imajima, 2009
  • Glycera sheikhmujibi Hossain & Hutchings, 2020
  • Glycera southeastatlantica Böggemann, 2009
  • Glycera sphyrabrancha Schmarda, 1861
  • Glycera subaenea Grube, 1878
  • Glycera taurica Czerniavsky, 1881
  • Glycera tenuis Hartman, 1944
  • Glycera tesselata Grube, 1863
  • Glycera tridactyla Schmarda, 1861
  • Glycera unicornis Lamarck, 1818

Use by humans

Glycera worms are sold commercially in tackle shops as bait for saltwater fishing.[8]

References

  1. ↑ Chien PK, Rice MA (1985). "Autoradiographic localization of exogenously supplied amino acids after uptake by the polychaete, Glycera dibranchiata Ehlers". Wasmann Journal of Biology. 43: 60–71. ISSN 0043-0927. OCLC 6322423.
  2. ↑ Qafaiti M, Stephens GC (1988). "Distribution of Amino Acids to Internal Tissues After Epidermal Uptake in the Annelid Glycera dibranchiata" (PDF). Journal of Experimental Biology. 136 (1): 177–191. doi:10.1242/jeb.136.1.177.
  3. ↑ "Bloodworm: Uses and applications as a fishing bait". Archived from the original on 2013-03-15. Retrieved 2012-12-03.
  4. ↑ Lichtenegger HC, Schöberl T, Bartl MH, Waite H, Stucky GD (October 2002). "High abrasion resistance with sparse mineralization: copper biomineral in worm jaws". Science. 298 (5592): 389–92. Bibcode:2002Sci...298..389L. doi:10.1126/science.1075433. PMID 12376695. S2CID 14001250.
  5. ↑ Lichtenegger HC, Schöberl T, Ruokolainen JT, et al. (August 2003). "Zinc and mechanical prowess in the jaws of Nereis, a marine worm". Proc. Natl. Acad. Sci. U.S.A. 100 (16): 9144–9. Bibcode:2003PNAS..100.9144L. doi:10.1073/pnas.1632658100. PMC 170886. PMID 12886017.
  6. ↑ Lesté-Lasserre, Christa (April 25, 2022). "Bloodworms have copper jaws that could inspire self-building materials". New Scientist. Retrieved April 26, 2022.
  7. ↑ Read, G.; Fauchald, K. (Ed.) (2023). World Polychaeta Database. Glycera Lamarck, 1818. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=129296 on 2023-10-15
  8. ↑ WHITTLE, PATRICK (2017-04-27). "Abating Bait: Decline in Prized Worms Threatens Way of Life". U.S. News. Archived from the original on 2018-04-21.

"Fishing for Allergens: Bloodworm-Induced Asthma" study at the Allergy, Asthma & Clinical Immunology (AACI) site [1]

  1. ↑ Wu, Keith CP; Räsänen, Katja; Hudson, Thomas J. (2005). "Fishing for Allergens: Bloodworm-Induced Asthma". Allergy, Asthma & Clinical Immunology. 1 (2): 58–59. doi:10.1186/1710-1492-1-2-58. PMC 2877067. PMID 20529225.
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