| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Isodiametra bajaensis Hooge & Eppinger, 2005 |
Eastern Central Pacific | 0.033 | |
| Isodiametra colorata (Ehlers & Dörjes, 1979) |
Southeast Pacific | ||
| Isodiametra divae (Marcus, 1950) |
Southwest Atlantic | 0.05 | |
| Isodiametra earnhardti (Hooge & Smith, 2004) |
Western Central Atlantic | 0.065 | |
| Isodiametra hortulus (Hooge & Tyler, 2003) |
Northwest Atlantic | 0.15 | |
| Isodiametra karpredi (Hooge & Tyler, 2001) |
Northwest Atlantic | 0.05 | |
| Isodiametra marginalis (Ivanov, 1952) |
Northwest Pacific | ||
| Isodiametra norvegica (Westblad, 1946) |
North Atlantic | ||
| Isodiametra pulchra (Smith & Bush, 1991) |
Northwest Atlantic | 0.0504 | |
| Isodiametra variomorpha (Dörjes, 1968) |
Northeast Atlantic | ||
| Isodiametra vexillaria (Marcus, 1948) |
Southwest Atlantic | 0.03 | |
| Isodiametra westbladi (Marcus, 1949) |
Southwest Atlantic |