A population of the tree snail, Amphidromus atricallosus perakensis was recently discovered near Lower Seletar Reservoir in the north-eastern part of Singapore Island. The find represents the first confirmed record of this subspecies in Singapore where it is believed to be non-native.

We report the discovery of several specimens of the genus Encheloclarias Herre & Myers, 1937, in Singapore, from Nee Soon Swamp Forest in the Central Catchment Nature Reserve. Morphological comparisons with type specimens of various Encheloclarias species revealed the Singapore specimens belong to Encheloclarias kelioides Ng & Lim, 1993. This discovery represents a range extension for the species, previously understood to be restricted to peat swamps in eastern Peninsular Malaysia and possibly central Sumatra. A redescription of E. kelioides and comparison against its congeners are provided. Its ecology and conservation status globally and locally are also discussed.

The nymphalid butterfly Athyma reta Moore is shown from field observations and breeding experiments to have a black-and-orange female that has in the past been confused with A. nefte (Cramer) female-form neftina (Frühstorfer). Its life history is described, and the morphology of its early stages compared with A. nefte and other species of Athyma Westwood. Morphological analysis of specimens in collections confirmed that A. reta is sexually dimorphic and has a monomorphic female that can be differentiated from neftina by at least two characters. Numerous females of A. reta have been misidentified in the literature and in collections as A. nefte female-form neftina, and many black-and-white males of A. reta have been misidentified as its female. Misidentifications in the literature are corrected. Descriptions in literature of the female of A. reta being black-and-grey in India are shown to be caused by historical confusion between taxa. This confusion may also have caused it to be wrongly reported from Burma and India. Evidence suggests that unlike A. nefte, which ranges from the Southeast Asian islands to the Asian continent, the distribution of A. reta does not extend further north than southern Thailand. Implications of the early stage and adult morphology to previously suggested infrageneric groupings of Athyma are discussed. Based on shared larval and pupal morphology, sexual dimorphism, and adult venation, Athyma reta is closely related to A. nefte and A. cama Moore, but distant from A. kanwa Moore with which it has been grouped in the past. A revised key is given for the species of Athyma in the Peninsula that have hairless eyes and a closed forewing cell.

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