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Trying to establish a systematic classification of the "Monoplacophora" is not easy, especially since it seems that "Monoplacophora" is a grade rather than a natural group.

As with all , an understanding of the soft parts are important, and, apart from the living (representing only a single order and family of this once diverse group) and muscle scars on fossil shells, these are lacking. In the now dated volume of the , Knight & Yochelson (1960) review all known forms, and have two or three orders and 5 or 6 families (some taxa have a question mark next to them). Runnegar Jell (1976) present a simpler arrangement, synonymising several higher taxa. This results in 3 orders (including ) and eight or nine familes, but this includes many taxa that Peel (1991) transfers to the , and Wagner to the Helcionelloida and "Quasirostroconchs". In any case, if the early evolution of other groups is anything to go on, it is likely that the "Monoplacophora" were quite diverse as far as high-level taxa go, even if there were not many different types on the level of species.

It is quite likely that the "Monoplacophora" is a polyphyletic grouping, as cladistic analysis gives confusing results. Waller (1998) shows that the are the sister group of all other . Meanwhile Wagner, in a more complex cladogram based on an analysis of a large number of early and other molluscs, has the "" (, and ) as the sister-group to tropidodiscid bellerophonts, and from those in turn the sister group of gastropods proper. Which implies (Helcionelloida ( (Kiringella + Hypseloconida (Cyrtolites ( (Gastropoda))))).

For this reason I would limit use of the term "Monoplacophora" sensu strictu to the Tryblidiida, which are a monophyletic off-shoot of the basal Conchifera, the Helcionelloida, which are a more derived but paraphyletic group of basal Conchifera, and the minus the Tryblidiida, which are an early sister group to the proto-gastropods, also probably paraphyletic.

Eventually, as more studies and cladistic analysis is done on basal molluscs, a more complete picture should emerge.

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(Middle - Recent)

The Tryblidiida are a group of very primitive and ancient mollusks with mostly simple cap-shaped shells. They have previously been (and are often still) called the Monoplacophora. However, it is now known that "Monoplacophora" refers to a very diverse assemblage of basal mollusks, and is not a natural group. John Peel suggest that the Monoplacophora should be divided into two classes, the Tergomya and the Helcionelloida, but even the Tergomya may be a polyphyletic group.

The Tryblidiida include the typical "Monoplacophora" - a number of early Paleozoic forms, and are represented among today's biota by the "living fossil" Neopilina. It is possible that they represent an ancestral molluscan type. Runnegar & Pojeta (1974). Cladistic analysis (Waller, 1998) shows that they are the sister group of all other Conchifera.

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The Tryblidiida first appear in the fossil record during the earliest Middle (Runnegar & Jell, 1976 ) or Late (Yochelson 1978) Cambrian (earlier forms are now considered to be helcionelloidans), a time when mollusks were undergoing a great evolutionary radiation with a number of new classes appearing. It is possible that they evolved from earlier soft-bodied ancestors. Alternatively they are a late group and their primitive features misleading.

Although never a diverse or abundant group, they are well-represented in the fossil record from the late Cambrian to the Devonian. After that time they disappear; so it can be assumed that is when they migrated to the deep water environments they still occupy today.

Until the discovery of the deep-sea mollusk Neopilina in 1952, the Tryblidiida and other "Monoplacophora" were considered to be an extinct branch of early primitive untorted gastropods, called "" (Moore et al., 1952). Modern forms appear to be little changed from their early ancestors. It is likely that these Paleozoic forms were benthic algal/bacterial grazers in shallow marine environment of varying energy [ref ], and that the migration to deep sea benthos probably occurred later.

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Seven or eight living species of Neopilina are known (with quite likely more awaiting discovery), and have usually been dredged from depths of between 2000 and 6500 meters in the South Atlantic, Gulf of Aden, and East Pacific. (Barnes, 1980). While a widespread part of the deep water benthos, their ecology is unknown. Modern forms appear to be little changed since the early Paleozoic.

Tryblidiids are modestly sized molluscs (Neopilina does not exceed 3 cm, and Paleozoic forms were mostly of similar size), with a simple -curved limpet-like shell. They are distinguished by the fact that virtually all organ systems are found in multiples. Neopilina has 6 pairs of gills and of , 8 pairs of retractor muscles, 2 pairs of gonads and , and so on. . While the soft parts of extinct forms are not known, the fact that fossil species show multiple muscle scars indicate a similar bauplan.

This or quasi-segmented body plan led to the idea that "Monoplacophora" had a common ancestry with other metameric like and . However, neither extant primitive molluscs or Cambrian pre-annelid and pre-molluscan like and are obviously segmented (although the regular series of scales in the latter two forms may be the beginning of segmentation). It is possible then that the multiple organ systems and body segments developed independently among a number of different organisms.

Runnegar & Pojeta (1974) suggest that with their segmented shells evolved from "Monoplacophora" ancestors, but it is also possible again that this adaptation developed independently, although Knight & Yochelson suggest a relationship between the Polyplacophora and Tryblidiida. However, Waller 1998 and other cladistic analysis does not indicate that the Polyplacophora and Tryblidiida are a natural group or clade within the Mollusca.

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