Pycnogonida
Austrodecidae
| Family | Common Name | Selected Genus and Species | Image |
| Austrodecidae | Sea spiders | Austrodecus bamberi |  |
Order: Pantopoda
| Family | Common Name | Selected Genus and Species | Image |
| Ammotheidae | Sea spiders | Sericosura verenae |  |
| Ascorhynchidae | Sea spiders | Ascorhynchus japonicus |  |
| Callipallenidae | Sea spiders | Propallene vagus |  |
| Colossendeidae | Sea spiders | Colossendeis colossea |  |
| Endeidae | Sea spiders | Endeis charybdaea |  |
| Nymphonidae | Sea spiders | Nymphon australe |  |
| Pallenopsidae | Sea spiders | Pallenopsis hodgsoni |  |
| Phoxichilidiidae | Sea spiders | Phoxichilidium femoratum |  |
| Pycnogonidae | Sea spiders | Pycnogonum litorale |  |
| Rhynchothoracidae | Sea spiders | Rhynchothorax australis |  |
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