Ischnochitonidae is a family of polyplacophoran mollusc.

Callistochiton is a genus of polyplacophoran molluscs, alive today, of which fossils are known from the Pliocene period onwards.
Ischnochiton is a genus of polyplacophoran mollusc.

Ischnochiton comptus is a medium-sized polyplacophoran mollusc in the family Ischnochitonidae.
Ischnochiton elongatus, the lengthened chiton or elongate chiton, is a species of chiton in the family Ischnochitonidae.
Ischnochiton evanida is a species of chiton in the genus Ischnochiton of the family Ischnochitonidae.

Ischnochiton lineolatus, commonly known as the lined ischnochiton is a species of chiton in the genus Ischnochiton that lives under rocks in the intertidal waters of southern and south-western Australia, from Bass Strait to the central west coast. It is commonly found throughout its wide range, and is often found with Ischnochiton cariosus. It grows to 40 mm long. Its back has a brown rim, and white scales with scattered brown dashes parallel with its axis.

Ischnochiton maorianus, sometimes called the variable chiton, is a fast moving species of chiton in the family Ischnochitonidae, endemic to the main islands of New Zealand where it is abundant.
Ischnochiton smaragdinus is a species of chiton in the family Ischnochitonidae.

Ischnochiton torri, commonly known as Torr's ischnochiton, is a species of chiton in the genus Ischnochiton that lives under rocks in the intertidal and shallow subtidal waters of southern Australia. It is commonly found throughout its wide range, and is often found with Ischnochiton cariosus. It grows to 40 millimetres (1.6 in) long. Its back has an orange rim and a brown-scaled covering, with a cream-coloured stripe along its axis.
Lepidochitona is a genus of chitons. It has been included in the families Tonicellidae, Ischnochitonidae, and Lepidochitonidae.
Lepidochitona cinerea, known by the common names common chiton or gray chiton, is a chiton.
Lepidozona is a genus of chitons belonging to the family Ischnochitonidae.

Stenoplax is a genus of polyplacophoran molluscs.
Stenoplax conspicua, the conspicuous chiton, is a species of polyplacophoran mollusc belonging to the family Ischnochitonidae.

Tonicella is a genus of chitons known as the lined chitons. The genus name derives from the Greek tonos and cell (diminutive).

Tonicella insignis, the white-lined chiton, or red chiton, also known as the hidden chiton, belongs to the Tonicellidae family in the class Polyplacophora, and the phylum of Mollusca. Its body length of T. insignis is around 5 cm.

Tonicella lineata, commonly known as the lined chiton, is a species of chiton from the North Pacific.

Tonicella lokii, commonly known as the flame lined chiton or Loki's chiton, is a chiton in the lined chiton genus Tonicella.

Tonicella marmorea is a species of chiton, a polyplacophoran mollusc found in the Arctic Ocean and the North Atlantic Ocean. It was first described by the Danish missionary and naturalist Otto Fabricius.

Tonicella undocaerulea, commonly known as the blue lined chiton, is a species of chiton.