Scoletoma tetraura

About Scoletoma tetraura

Scoletoma tetraura is a lumbrinerid annelid retained from the 2002 Kauaʻi estuary and bay monitoring record under its older combination Lumbrineris tetraura. EPA Table 3.3-1 provides the local occurrence context. The accepted combination reflects a taxonomic change, not a new local observation. This record does not quantify today’s abundance, resolve native status or establish occupancy throughout Kauaʻi’s coastal sediments.

Schmarda’s 1861 original description, as Notocirrus tetraurus, supplies specific complete-animal characters. The worm is cylindrical and brownish, with a metallic sheen and blue iridescence; the described animal was about 100 mm long, 4 mm wide and approximately two hundred segments. Its head is thick and triangular, and the final segment bears four comparatively long caudal cirri. The original account places the material in sand and mud at the Cape of Good Hope and along the Chilean coast. Those type-region localities are morphology references, not added Hawaiian occurrence records.

Day’s 1967 treatment describes a conical prostomium, small unequal parapodial lobes, anterior winged capillary chaetae and simple hooded hooks that change shape along the body. The maxillary plates and yellow aciculae are important microscopic identification characters. These require an actual specimen comparison; the image cannot reveal the full jaw formula through an intact animal. The reconstruction follows the original slender body and four terminal cirri, with sparse lateral chaetae and subdued brown-blue sheen. It portrays one complete animal in sediment habitat and does not invent conspicuous gills, head antennae or a sexually contrasting partner.

Modern evidence limits the historically broad species concept. Simon and colleagues’ 2021 integrative study found morphologically similar South African worms that matched traditional tetraura descriptions but differed genetically, identifying their material as separate Scoletoma concepts rather than silently extending the species name. That finding cautions against assuming that every distant record represents one lineage. It does not itself reidentify the Kauaʻi sample. Here the image is a reconstruction of the historical morphological concept attached to the source, not a DNA-verified Kauaʻi portrait. Reexamining the monitoring voucher with jaws, chaetae, complete posterior anatomy and, where possible, sequence evidence would clarify its modern identity. Local diet, breeding season and present conservation trend remain unmeasured by the cited occurrence.