| Heydenius Temporal range: | |
|---|---|
 | |
| Heydenius formicinus adjacent to its worker ant host in Baltic amber | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Nematoda |
| Class: | Enoplea |
| Order: | Mermithida |
| Family: | Mermithidae |
| Genus: | † Heydenius Taylor, 1935 |
| Species | |
See text | |
Heydenius is a collective group genus of fossil mermithid nematodes from the Tertiary period that cannot be placed in extant genera. [1]
| Scientific name | Age | Type locality | Country | Host | Notes |
|---|---|---|---|---|---|
| Heydenius antiquus(von Heyden, 1860) Taylor, 1935 | Oligocene/Miocene | Rhine lignite |  Germany | Hesthesis immortua von Heyden, 1862 (Coleoptera, Cerambycidae) | Originally named Mermis antiquavon Heyden, 1860. |
| Heydenius arachnius Poinar, 2012 [2] | Miocene | Dominican amber |  Dominican Republic | Araneae | |
| Heydenius araneusPoinar, 2000 [3] | Eocene | Baltic amber |  Russia (  Kaliningrad Oblast) | Araneae, Thomisidae | |
| Heydenius browniiPoinar, 2001 [4] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Hemiptera, Achilidae | |
| Heydenius cecidomyaePoinar, 2011 [1] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Diptera, Cecidomyiidae | |
| Heydenius dipterophilusPoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Diptera, Milichiidae | |
| Heydenius dominicusPoinar, 1984 [5] | Miocene | Dominican amber | Dominican Republic | Culex (Diptera, Culicidae) | |
| Heydenius formicinusPoinar, 2002 [6] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Prenolepis henschei Mayr, 1868 (Hymenoptera, Formicidae) | |
| Heydenius lamprophilusPoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Coleoptera, Lampyridae | |
| Heydenius matutinus(Menge, 1866) Taylor, 1935 | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Diptera, Chironomidae | Originally named Mermis matutinaMenge, 1866. |
| Heydenius myrmecophilaPoinar, Lachaud, Castillo & Infante, 2006 [7] | Miocene | Dominican amber | Dominican Republic | Linepithema (Hymenoptera: Formicidae) | |
| Heydenius neotropicusPoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Diptera, Chironomidae | |
| Heydenius phasmatophilusPoinar, 2012 [2] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Balticophasma (Phasmatodea: Phasmatidae) | |
| Heydenius podenasaePoinar, 2012 [2] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Lepidoptera | |
| Heydenius psychodaePoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Diptera, Psychodidae | |
| Heydenius quadristriatus(Menge, 1872) Taylor, 1935 | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Unknown | Originally named Mermis quadristriataMenge, 1872. |
| Heydenius saprophilusPoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Diptera, Anisopodidae | |
| Heydenius scatophilusPoinar, 2011 [1] | Miocene | Dominican amber | Dominican Republic | Diptera, Scatopsidae | |
| Heydenius sciarophilusPoinar, 2011 [1] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Diptera, Sciaridae | |
| Heydenius simulphilusPoinar & Currie, 2019 [8] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Diptera, Simuliidae | |
| Heydenius tabanaePoinar, 2011 [1] | Late Pliocene (Piacenzian) | Willershausen clay pit | Germany | Tabanus sudeticus Zeller, 1842 (Diptera, Tabanidae) | |
| Heydenius trichorosusPoinar, 2012 [2] | Eocene | Baltic amber | Russia ( Kaliningrad Oblast) | Triaenodes balticus Wichard & Barnard, 2005 (Trichoptera, Leptoceridae) |
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