Found in rotting log.
Recently introduced exotic. Allegedly feeds on snails and slugs only. Also called Mollusc-eating Hammerhead Worm.
Always wanted to know if these are really nematode 'worms'. I see them often and when I ask 'experts' they usually throw their hands up in horror, scream 'Nematode worm of some kind' and head for the hills. A reflection I am told on the current lack (or almost lack) to local New Zealand taxonomic skills or interest in these 'things'.
Single one found under rotting macrocarpa (Cupressus macrocarpa) logs lying in pasture near stream. Colour (to colour vision impaired me) 'bluish black' to black with light patches near assumed 'head' end, coiled up when found but extended rapidly when exposed to about 50 mm in length. Underside reddish.
Found under a rock in shallow water.
The flatworms, known in scientific literature as Platyhelminthes or Plathelminthes (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning worm) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrate animals. Unlike other bilaterians, they have no body cavity, and no specialized circulatory and respiratory organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening...