Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, while some other prefer to maintain it.
Species
Species within the genus Dactylioceras include:thumb|200px|right|Digital artist's recreation
thumb|200px|Dactylioceras (Orthodactylites) helianthoides
thumb|200px|Dactylioceras (Orthodactylites) semicelatum
- D. (O.) aequistriatum <small>Zieten, 1830</small>
- D. (D.) alpestre <small>Wiedenmayer, 1980</small>
- D. (D.) amplum <small>Dagis, 1968</small>
- D. (O.) andaluciensis <small>Jiménes & Rivas, 1991</small>
- D. (O.) anguiforme <small>Buckman, 1928</small>
- D. (O.) anguinum <small>Reinecke, 1818</small>
- D. (D.) annuliferum <small>Simpson, 1855</small>
- D. (D.) arcus <small>Buckman, 1926</small>
- D. (D.) athleticum <small>Simpson, 1855</small>
- D. (D.) attenuatum <small>Simpson, 1855</small>
- D. (O.) chilense <small> Hillebrandt and Schmidt-Effing, 1981</small>
- D. (O.) clevelandicum <small>Howarth, 1973</small>
- D. (D.) commune <small>Sowerby, 1815</small>
- D. (D.) comptum <small>Dagis, 1968</small>
- D. (D.) consimile <small>Buckman, 1926</small>
- D. (D.) crassescens <small>Simpson, 1855</small>
- D. (O.) crassifactum <small>Simpson, 1855</small>
- D. (O.) crassiusculosum <small>Buckman, 1912</small>
- D. (D.) crassiusculum <small>Simpson, 1855</small>
- D. (D.) crassulum <small>Buckman, 1921</small>
- D. (D.) crosbeyi <small>Simpson, 1843</small>
- D. (O.) directum <small>Buckman, 1926</small>
- D. (O.) ernsti <small>Lehmann, 1968</small>
- D. (D.) gracile <small>Simpson, 1843</small>
- D. (O.) helianthoides <small>Yokoyama, 1904</small>
- D. (O.) hispansum <small>Schmidt-Effing, 1972</small>
- D. (O.) hoelderi <small>Hillebrandt & Schmidt-Effing, 1981</small>
- D. (D.) holandrei <small>d'Orbigny, 1845</small>
- D. (O.) ketevanae <small>Repin, 2000</small>
- D. (O.) kanense <small>McLearn, 1930</small>
- D. (I.) ketevanae <small>Repin, 2000</small>
- D. (D.) laticostatum <small>Bardin et al., 2014</small>
- D. (O.) marioni <small>Lissajous, 1906</small>
- D. (E.) mirabile <small>Fucini, 1935</small>
- D. (D.) mite <small>Buckman, 1927 </small>
- D. (D.) peloritanum <small>Fucini, 1935</small>
- D. (D.) percostatum <small>Fucini, 1935</small>
- D. (D.) perplicatum <small>Fucini, 1935</small>
- D. (E.) polymorphum <small>Fucini, 1935</small>
- D. (D.) praepositum <small>Buckman, 1927</small>
- D. (E.) pseudocommune <small>Fucini, 1935</small>
- D. (D.) pseudocrassoides <small>Maubeuge, 1957</small>
- D. (O.) sapunovi <small>Repin, 2000</small>
- D. (O.) semiannulatum <small>Howarth, 1978</small>
- D. (O.) semicelatum <small>Simpson, 1843</small>
- D. (E.) simplex <small>Fucini, 1935</small>
- D. (D.) stresherense <small>Sapunov, 1963</small>
- D. (D.) subholandrei <small>Fucini, 1935</small>
- D. (D.) suntarense <small>Krimholz, 1957</small>
- D. (D.) tardosensis <small>Kovács, 2014</small>
- D. (D.) tauromenense <small>Fucini, 1935</small>
- D. (D.) temperatum <small>Buckman, 1927</small>
- D. (O.) tenuicostatum <small>Young & Bird, 1822</small>
- D. (O.) toxophorum <small>Buckman, 1926</small>
- D. (D.) triangulum <small>Fischer, 1966</small>
- D. (D.) vermis <small>Simpson, 1855</small>
- D. (O.) wunnenbergi <small>Hoffmann, 1968</small>
thumb|200px|right| Dactylioceras (Dactylioceras) commune'Dactylioceras commune has shells reaching a diameter of . Usually the average diameter reach about , while the average width is .
Fossils of this species have been found in Lower Jurassic, Toarcian age of Canada, France, Italy, Russia, Serbia and Montenegro, United Kingdom and United States.