Hepatopancreas

Photo of a 5-mm-long juvenile of Haliotis asinina (with the shell removed) shows the yellow hepatopancreas on the left.

Drawing shows that the mantle (in grey) covers the majority of the dorsal surface of the animal.^[1] The gills (g), digestive gland (dg), adductor muscle (am), epipodial tentacles (ept), right mantle lobe (rml), eyespot (es), cephalic tentacles (ct) and left mantle lobe (lml) are indicated.

The hepatopancreas, digestive gland or midgut gland is an organ of the digestive tract of arthropods and molluscs. It provides the functions which in mammals are provided separately by the liver and pancreas, including the production of digestive enzymes, and absorption of digested food.^[2]

Arthropods

Arthropods, especially detritivores in the Order Isopoda, Suborder Oniscidea (woodlice), have been shown to be able to store heavy metals in their hepatopancreas.^[3] This could lead to bioaccumulation through the food chain and implications for food web destruction, if the accumulation gets high enough in polluted areas; for example, high metal concentrations are seen in spiders of the genus Dysdera which feed on woodlice, including their hepatopancreas, the major metal storage organ of isopods in polluted sites.^[4]

Molluscs

3D reconstruction of the general anatomy of Pseudunela cornuta shows the digestive gland (dg) in green color

3D reconstruction of the digestive system of Pseudunela cornuta shows the digestive gland (dg) more clearly

Histology section of hepatopancreas of slug Deroceras laeve

The hepatopancreas is a centre for lipid metabolism and for storage of lipids in gastropods.^[6]

Some species in the genus Phyllodesmium contains active zooxanthellae of the genus Symbiodinium in the hepatopancreas.^[7]

References

^ Daniel J. Jackson; Carmel McDougall; Kathryn Green; Fiona Simpson; Gert Wörheide; Bernard M Degnan (2006). "A rapidly evolving secretome builds and patterns a sea shell". BMC Biology. 4: 40. doi:10.1186/1741-7007-4-40. PMC 1676022. PMID 17121673.
^ "Blue Crab Anatomy". Archived from the original on 2019-01-27. Retrieved 2011-05-19.
^ Claus Svendsen; Graeme Paton; Jason M. Weeks (2002). "Soil biomarkers (invertebrates and microbes) for assessing site toxicity". In G. I. Sunahara; A. Y. Renoux; C. Thellen; C. L. Gaudet; A. Pilon (eds.). Environmental Analysis of Contaminated Sites. John Wiley and Sons. pp. 95–134. ISBN 978-0-471-98669-0.
^ S. P. Hopkin; M. H. Martin (1985). "Assimilation of zinc, cadmium, lead, copper and iron by the spider Dysdera crocata, a predator of woodlice" (PDF). Bulletin of Environmental Contamination and Toxicology. 34 (2): 183–187. Bibcode:1985BuECT..34..183H. doi:10.1007/bf01609722. PMID 3978257. S2CID 39086273. Archived from the original (PDF) on 2011-07-22.
^ Maeda T., Hirose E., Chikaraishi Y., Kawato M., Takishita K. et al. (2012). "Algivore or Phototroph? Plakobranchus ocellatus (Gastropoda) Continuously Acquires Kleptoplasts and Nutrition from Multiple Algal Species in Nature". PLoS ONE 7(7): e42024. doi:10.1371/journal.pone.0042024
^ Böer M., Graeve M. & Kattner G. (2006). "Exceptional long-term starvation ability and sites of lipid storage of the Arctic pteropod Clione limacina". Polar Biology 30(5): 571-580. doi:10.1007/s00300-006-0214-6.
^ Ingo Burghardt; Heike Wägele (2004). "A new solar powered species of the genus Phyllodesmium Ehrenberg, 1831 (Mollusca: Nudibranchia: Aeolidoidea) from Indonesia with analysis of its photosynthetic activity and notes on biology" (PDF). Zootaxa. 596: 1–18. doi:10.11646/zootaxa.596.1.1.

[1] Daniel J. Jackson; Carmel McDougall; Kathryn Green; Fiona Simpson; Gert Wörheide; Bernard M Degnan (2006). "A rapidly evolving secretome builds and patterns a sea shell". BMC Biology. 4: 40. doi:10.1186/1741-7007-4-40. PMC 1676022. PMID 17121673.

[VIMS-crab_anatomy-2] "Blue Crab Anatomy". Archived from the original on 2019-01-27. Retrieved 2011-05-19.

[3] Claus Svendsen; Graeme Paton; Jason M. Weeks (2002). "Soil biomarkers (invertebrates and microbes) for assessing site toxicity". In G. I. Sunahara; A. Y. Renoux; C. Thellen; C. L. Gaudet; A. Pilon (eds.). Environmental Analysis of Contaminated Sites. John Wiley and Sons. pp. 95–134. ISBN 978-0-471-98669-0.

[4] S. P. Hopkin; M. H. Martin (1985). "Assimilation of zinc, cadmium, lead, copper and iron by the spider Dysdera crocata, a predator of woodlice" (PDF). Bulletin of Environmental Contamination and Toxicology. 34 (2): 183–187. Bibcode:1985BuECT..34..183H. doi:10.1007/bf01609722. PMID 3978257. S2CID 39086273. Archived from the original (PDF) on 2011-07-22.

[5] Maeda T., Hirose E., Chikaraishi Y., Kawato M., Takishita K. et al. (2012). "Algivore or Phototroph? Plakobranchus ocellatus (Gastropoda) Continuously Acquires Kleptoplasts and Nutrition from Multiple Algal Species in Nature". PLoS ONE 7(7): e42024. doi:10.1371/journal.pone.0042024

[Böer_2006-6] Böer M., Graeve M. & Kattner G. (2006). "Exceptional long-term starvation ability and sites of lipid storage of the Arctic pteropod Clione limacina". Polar Biology 30(5): 571-580. doi:10.1007/s00300-006-0214-6.

[Burghardt_2004-7] Ingo Burghardt; Heike Wägele (2004). "A new solar powered species of the genus Phyllodesmium Ehrenberg, 1831 (Mollusca: Nudibranchia: Aeolidoidea) from Indonesia with analysis of its photosynthetic activity and notes on biology" (PDF). Zootaxa. 596: 1–18. doi:10.11646/zootaxa.596.1.1.

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v t e Gastropod anatomy
Shell	Aperture Apex Body whorl Callus Columella Lip Lira Nacre Periostracum Peristome Planispiral Plait Protoconch Sculpture Selenizone Siphonal canal Siphonal notch Spire Stromboid notch Suture Umbilicus Valve Varix Whorl
Other hard parts	Clausilium Love dart Operculum Pearl Radula
External soft parts	Caryophyllidia Caudal mucous pit Cerata Cnidosac Mantle Mentum Notum Parapodium Pneumostome Rhinophore Semper's organ Siphon Suprapedal gland
Internal soft parts	Circulatory system of gastropods Crop Ctenidium Digestive system of gastropods Diverticula Excretory system of gastropods Gastric shield Hancock's organ Hepatopancreas Hypobranchial gland Nephridium Nervous system of gastropods Nidamental gland Odontophore Oesophageal pouch Osphradium Reproductive system of gastropods Respiratory system of gastropods Sensory organs of gastropods
Other	Epiphragm Pseudofeces Torsion Circumesophageal nerve ring Trochophore Tyrian purple Veliger

Arthropods

Molluscs

See also

References