T.E.R:R.A.I.N - Taranaki Educational Resource: Research, Analysis and Information Network

Harvestmen (Megalopsalis) Long-legged harvestman

Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Opiliones
Suborder: Eupnoi
Superfamily: Phalangioidea
Family: Monoscutidae
Genus:  Megalopsalis and 
Genus: Pantopsalis
Genus: Mangatangi
Common name: Longlegged harvestman, Long clawed harvestman.

Harvestmen are an order of arachnids( spiders), with which they share many characteristics: their body is divided into two body regions (tagmata), the abdomen (opisthosoma) and the cephalothorax (prosoma); however, unlike in spiders, the juncture is often poorly defined. They have chelicerae, pedipalps and four pairs of legs. Most harvestmen have two eyes, although there are eyeless species. Unlike spiders, harvestmen do not have venom or silk glands. 
There are many native species in New Zealand's three genus 
For general information about Harvestman Click Here

There are many native species in three genera, Megalopsalis, Pantopsalis and Mangatangi.

Few are named. The 8 photos below are of a male Long-clawed harvestman (Pantopsalis genus)  which have black bodies and enlarged, two-segmented chelicerae (mouth appendages) that tower above their body like a crane. It has very fine legs which break off easily to help it escape from a predator. With such long legs, it can move very quickly over a range of terrains.

The two-segmented chelicerae (mouth appendages) that tower above their body like a crane.

The claw at the end of a chelicerae 

Another local species probably one in the Genus: Forsteropsalis. Exact identification is made by examing the male genitalia.

Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/