Two new species of Terebrasabella (Annelida: Sabellidae: Sabellinae) from Australia Author Murray, Anna Author Rouse, Greg W. text Zootaxa 2007 1434 51 68 journal article 10.5281/zenodo.175840 11317d12-cbbc-495d-a739-6c2272b28fd6 1175-5326 175840 Comparison of Terebrasabella spp. The characters that distinguish the two species described here are as follows: Thoracic uncini form: Terebrasabella hutchingsae sp. nov. , has two forms of acicular uncini (“palmate” and heterodont-crested uncini) both of which are different to the single type present in Terebrasabella fitzhughi sp. nov. , (homodont-crested uncini). Terebrasabella heterouncinata possesses only heterodontcrested acicular uncini. Abdominal uncini form: T. hutchingsae sp. nov. , has acicular uncini that are a smaller version of the longhandled “palmate” uncini of chaetiger 1, whereas those of T. fitzhughi sp. nov. , are homodont-crested with a series of many fine teeth. T. heterouncinata possesses long-handled heterodont-crested acicular uncini. Ventral peristomial lappets: anteriorly elongate on specimens of T. fitzhughi sp. nov. , and relatively shorter and distally-rounded on T. hutchingsae sp. nov. T. heterouncinata has small, triangular, distallyrounded ventral collar lappets. The number of rasp-shaped avicular uncini per row: on chaetiger 7, is greater in T. hutchingsae sp. nov. , (~50) than in T. fitzhughi sp. nov. , (<24). T. heterouncinata has fewer uncini in chaetiger 7 (~23 per row), but more uncini in chaetiger 8 (~19 per row) than either of the other 2 species (both <15). The faecal tracks of T. hutchingsae sp. nov. , and T.fitzhughi sp. nov. , bifurcate in the 8th chaetiger, not the in the 10th chaetiger as in T. heterouncinata . The main characters that distinguish all three species of Terebrasabella are the different types of uncini. These are summarised in Table 1 . TABLE 1. Comparison of uncini in thorax and abdomen, between Terebrasabella spp. Uncini number and type in thorax and abdomen of: Chaetiger Terebrasabella heterouncinata Terebrasabella hutchingsae sp. Terebrasabella fitzhughi nov. sp. nov.