Evolution and Systematics

Evolution

Classification

The only classification problem with modern monoplacophorans is the discussion around using Monoplacophora Odhner, 1940 vs. Tryblidiida. Monoplacophora sl. as defined in Runnegar & Jell (1976) would include three orders among which Tryblidiida. Problems arise from the ambiguous position of some paleozoic fossil taxa which could be monoplacophorans or gastropods, or (worse) stem-group gastropods derived from monoplacophorans, thus making Monoplacophora paraphyletic. Preference for the name Tryblidiida follows Waller's (1998) conclusion that these are the sister-group to all other Conchifera, thus escaping being paraphyletic. Giribet et al. (2006: Proceedings of the National Academy of Sciences 103, 7723-7728) claimed that the monoplacophoran Laevipilina is recovered within a branch containing polyplacophoran taxa in an analysis including several nuclear and mitochondrial sequences. As mentioned above, this result based on a very small specimen is ignored in the classification draft until further confirmed.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Molecular Biology and Genetics

Molecular Biology

Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Monoplacophora

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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:2Public Records:2
Specimens with Sequences:2Public Species:1
Specimens with Barcodes:2Public BINs:2
Species:1         
Species With Barcodes:1         
          
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Source: Barcode of Life Data Systems (BOLD)

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Barcode data

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© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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