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The external morphology and movement of a living specimen of the minute gastropod Sukashitrochus pulcher (Petterd, 1884) is reported and the findings compared with the reported morphologies of other species of Sukashitrochus and scissurellids more generally. Although some scissurellids exhibit swimming behaviour, there is no evidence that temperate Australian Sukashitrochus species possess this ability. [ABSTRACT FROM AUTHOR]

The family Iravadiidae is found to be polyphyletic in a molecular phylogenetic analysis using a subset of Australian taxa. Taxa previously assigned toIravadiaform a monophyletic clade, butNozeba topaziacaclusters withAuricorona queenslandican. gen. and n. sp. in an unnamed family related to Tornidae.Aenigmula criscionein. gen. and n. sp., an iravadiid-like species from the Northern Territory, belongs to another unnamed family related to Caecidae, Calopiidae and Clenchiellidae. A systematic revision of some Australian ‘iravadiids’ raises the subgeneraFluviocingulaandPseudomerelinato full generic rank and reinstates two former synonyms ofIravadia (Fairbankia), PellamoraandWakauraia, as genera. The species formerly identified in Australia asIravadia quadrasiis recognised as three allopatric species;Iravadia pilbaran. sp. and the reinstated speciesIravadia goliathandIravadia quadrina. Pellamora splendidan. sp., from Western Australia, is recognised as distinct fromPellamora australis, andFluviocingula superficialisn. sp. fromFluviocingula resima. Wakauraia fukudain. sp. is recorded from central Queensland. http://zoobank.org/urn:lsid:zoobank.org:pub:1B9917F6-48B2-4597-85C1-F90BA9093475 [ABSTRACT FROM AUTHOR]

The Australian and East Timorese species belonging to the truncatelloid family Stenothyridae are revised using molecular data and morphological characters from the shell, operculum, radula and external and reproductive anatomy. The Australian speciesStenothyra australisis redescribed and two previously recognised subspecies are shown to be synonyms. The New Guinean speciesStenothyra paludicolavan Benthem Jutting, 1963 is redescribed and recorded from the Torres Strait region of northern Australia, and two new subspecies ofS. paludicolaare described from the Northern Territory and East Timor;S. paludicola topendensisn. subsp. andS. paludicola timorensisn. subsp. respectively.Stenothyra gelasinosan. sp. is described from Australia, comprising three allopatric subspecies;S. gelasinosa gelasinosan. sp. and n. subsp. from the eastern seaboard,S. gelasinosa phrixan. subsp. from northern Australia andS. gelasinosa apiosan. subsp. from the Pilbara region of Western Australia.Stenothyra frustillumis considered anomen dubium. Molecular phylogenetic analysis of these taxa and other Asian stenothyrids supports these systematic decisions and provides a preliminary interpretation of relationships within Stenothyridae. [ABSTRACT FROM PUBLISHER]