Brunner von Wattenwyl, 1888
Members of the genus are detritivorous scavengers that inhabit dark, damp refugia such as hollow logs, overhangs and caves during the day. They become more active at night and venture into the surrounding undergrowth to forage. They consume various organic matter such as plant seeds, fungi, animal droppings, and dead animal tissue. They will cannibalise the remains of other dead weta, and may also attack still-living cave weta while they are vulnerable during ecdysis (shedding their exoskeleton).
When Pachyrhamma is treated as a neuter noun, species names have a neuter suffix, e.g. -ceras rather than -cera, and -ense rather than -ensis.
- Pachyrhamma acanthoceras (Milligan) – Auckland cave wētā
- Pachyrhamma chopardi Karny, 1935
- Pachyrhamma edwardsii (Scudder, 1869)
- Pachyrhamma fascifer (Walker)
- Pachyrhamma uncata Richards, A. M., 1959
- Pachyrhamma waitomoensis – Waitomo cave wētā
- Cook, Lorraine D.; Trewick, Steven A.; Morgan-Richards, Mary; Johns, Peter M. (2010). "Status of the New Zealand cave weta (Rhaphidophoridae) genera Pachyrhamma, Gymnoplectron and Turbottoplectron". Invertebrate Systematics. 24 (2): 131. doi:10.1071/IS09047. ISSN 1445-5226.
- Richards, Aola M. (1961). "Some observations on New Zealand cave-wetas". Tuatara. 9 (2): 80–83. Retrieved 9 September 2017.