Caryophyllidea

The Caryophyllideans are a group of tapeworms that infect fish and annelids (segmented worms) with a simple scolex or "head." Worms in this order only have one proglottid, which is believed to be the primitive condition for tapeworms. They are generally less than 10 centimetres long. Caryophillideans represent a unique type of tapeworm, such that they possess a monzoic, unsegmented, body, with only a single set of reproductive organs.[1]

Caryophyllidea
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Cestoda
Subclass: Eucestoda
Order: Caryophyllidea

In the Caryophyllidean life cycle, adults live in fish, who pass the tapeworm eggs in their feces. Annelids eat the eggs, where they hatch into oncosphere larvae that move through intestinal wall and become procercoid larvae in the body cavity. When the annelid is eaten by a fish, the tapeworm matures. Catfish, suckers, and minnows are among the fishes that can serve as definitive hosts.

The genus Archigetes Leuckart, 1878,[2] a caryophyllidean, is unique among all tapeworms in that its species can mature in invertebrate hosts (Oligochaeta), i.e. have a monoxenic (direct) life cycle.[3]

Classification

According to WoRMS,[4] the Caryophyllidea include four families:

  • Family Balanotaeniidae Mackiewicz & Blair, 1978
  • Family Capingentidae Hunter, 1930
  • Family Caryophyllaeidae Leuckart, 1878
  • Family Lytocestidae Hunter, 1927

References
  1. Scholz, Tomáš; Waeschenbach, Andrea; Oros, Mikuláš; Brabec, Jan; Littlewood, D. Timothy J. (2021). "Phylogenetic reconstruction of early diverging tapeworms (Cestoda: Caryophyllidea) reveals ancient radiations in vertebrate hosts and biogeographic regions". International Journal for Parasitology. Elsevier BV. 51 (4): 263–277. doi:10.1016/j.ijpara.2020.09.009. ISSN 0020-7519. PMID 33275944. S2CID 227297890.
  2. Leuckart R. 1878. Archigetes sieboldi, eine geschlechtsreife Cestodenamme. Zeitschrift für Wissenschaftliche Zoologie, 30 (Suppl.), 593–606.
  3. Uhrovič, Dalibor; Oros, Mikuláš; Kudlai, Olena; Kuchta, Roman; Scholz, Tomáš (2022). "Archigetes Leuckart, 1878 (Cestoda, Caryophyllidea): diversity of enigmatic fish tapeworms with monoxenic life cycles". Parasite. 29: 6. doi:10.1051/parasite/2022002. ISSN 1776-1042. PMC 8826581. PMID 35138246.open access
  4. WoRMS (2021). Caryophyllidea. Accessed at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=104912 on 2022-01-14


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