Post-parasitic juvenile of Hexamermis sp., copyright S. Patricia Stock.

Belongs within: Dorylaimia.

The Mermithida are a group of nematodes that are parasitic on insects and other invertebrates. Members of the family Mermithidae emerge from the host as adults to breed whereas Tetradonematidae remain in their host. Fossil mermithids found in Dominican and Baltic amber have been assigned to the genus Heydonius (Poinar 1992).

Characters (from Khuong B. Nguyen): Parasites of invertebrates. Stichosome (longitudinal series of glandular cells arranged along the esophagus) present. Early juvenile stages with protrusible stylet that is absent in adults. Amphids dorylaimoid.

<==Mermithida [Mermithina, Mermithoidea, Stichosomia]
         |--Agamomermis phalangii (Haldeman 1851) [=Filaria phalangii]PC00
         |--Aranimermis giganteaPC00
         |--Mermis Dujardin 1842H62
         |    |--*M. nigrescens Dujardin 1842H62
         |    `--M. subnigrescensMM02
         |    |--A. decaudataG02
         |    `--A. unkaKH02
         |    |--H. albicansP93
         |    |--H. brevisJ02
         |    `--H. cavicolaNC91
         `--Heydonius Taylor 1935H62
              |--*H. matutinus (Menge 1866) [=Mermis matutina]H62
              |--H. antiquus Heydon 1862W93
              |--H. dominicus Poinar 1984P92
              `--H. quadristriata Menge 1872P92
Mermithida incertae sedis:
    |--G. boophthoraeMM02
    |--G. hibernalisH02
    `--G. interstitialis Kaiser & Kirchengast 1979E86
  Pheromermis cornicularisJ02
    |--A. bogongaeNC91
    `--A. elegansJ02
  Romanomermis culicivorax [incl. Reesimermis nielseni]KH02
  Heleidomermis libaniKH02
  Ovomermis sinensisKH02
Nomina nuda: Agamermis incerta Steiner in Stipperger 1928PC00
             Filaria truncata Rudolphi 1819 [=Mermis truncata]PC00
             Filaria truncatula Rudolphi 1819 [=Agamomermis truncatula, Gordius truncatula, Mermis truncatula]PC00

*Type species of generic name indicated


[E86] Eder, R. 1986. Nematoda from continental subterranean aquatic habitats. In: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 125–132. E. J. Brill/Dr W. Backhuys: Leiden.

[G02] Gems, D. 2002. Ageing. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 413–455. Taylor & Francis: Florence (Kentucky).

[H02] Hope, I. A. 2002. Embryology, developmental biology and the genome. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 121–145. Taylor & Francis: Florence (Kentucky).

[H62] Howell, B. F. 1962. Worms. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt W. Miscellanea: Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica pp. W144–W177. Geological Society of America, and University of Kansas Press.

[J02] Justine, J.-L. 2002. Male and female gametes and fertilisation. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 73–119. Taylor & Francis: Florence (Kentucky).

[KH02] Kerry, B. R., & W. M. Hominick. 2002. Biological control. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 483–509. Taylor & Francis: Florence (Kentucky).

[LB02] Ley, P. de, & M. Blaxter. 2002. Systematic position and phylogeny. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 1–30. Taylor & Francis: Florence (Kentucky).

[MM02] Munn, E. A., & P. D. Munn. 2002. Feeding and digestion. In: Lee, D. L. (ed.) The Biology of Nematodes pp. 211–232. Taylor & Francis: Florence (Kentucky).

[NC91] Nielsen, E. S., & I. F. B. Common. 1991. Lepidoptera (moths and butterflies). In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 2 pp. 817–915. Melbourne University Press: Carlton (Victoria).

[P93] Pittaway, A. R. 1993. The Hawkmoths of the Western Palaearctic. Harley Books: Colchester.

[P92] Poinar, G. O., Jr. 1992. Life in Amber. Stanford University Press: Stanford.

[PC00] Poinar, G. O., Jr., B. P. M. Čurčic, I. V. Karaman, J. C. Cokendolpher & P. G. Mitov. 2000. Nematode parasitism of harvestmen (Opiliones: Arachnida). Nematology 2 (6): 587–590.

[W93] Wills, M. A. 1993. Miscellania. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 555–560. Chapman & Hall: London.

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