Leodice australis

About Leodice australis

Leodice australis is a marine eunicid jaw worm originally described from New Zealand. The Kauaʻi source records use the older name Eunice australis. The head has two rounded lobes and five sensory appendages, interpreted in modern terminology as three antennae and two palps. A separate pair of peristomial cirri lies behind them. The appendages are articulated, with the median antenna longer than the outer pair. The many bristle-bearing segments have lateral parapodia, while comb-shaped gills occupy an anterior portion of the trunk rather than continuing to the tail.

The type-based redescription provides a useful, specific reference. Its specimen was 70 millimetres long and had 109 bristle-bearing segments, with the last ten in regeneration. Gills occurred from segments 7 through 33 and had at most eight filaments in that specimen. Supporting aciculae were yellow, and the three-toothed subacicular hooks generally occurred singly, apart from replacement hooks. These are specimen measurements and microscopic characters, not a claim that every individual has identical counts or that the Kauaʻi vouchers were measured this way.

The modern Australian review documents animals from sand, seagrass samples, sponge material and under rocks. It found substantial variation in where gills began, and noted that their posterior termination and hook distribution can vary with size. Some specimens previously identified as Eunice vittata were reassigned to Leodice australis after examining their hooks. The authors nevertheless considered it likely that more than one species remained within the name. Those findings explain identification difficulties; they do not transfer an Australian habitat record or identification directly to Kauaʻi.

The retained island entry comes from Appendix A, printed page 84, of Bishop Museum Technical Report 29a, with 2002 in the Atlas source evidence. It preserves the reported occurrence without claiming present abundance, native status or an island-wide range.

Image not available. The reviewed type description explicitly leaves the terminal pygidium and anal cirri unresolved, and the local record supplies no documented complete morphology. A whole-organism primary plate would therefore require unsupported tail details. The earlier illustration remains a credited secondary reference while a complete, reliably identified specimen or photographic reference is sought. No separate sex or juvenile appearance is inferred from these sources.