This species differs from other Musculium species by their elongate shell outline however because the shape of the muscle scars and ligament resemble Sphaerinova Korniusin (2000) suggested that there was a possibility that M. problematicum may just be a local form of S. tasmanicum (Korniushin, 2000).
Sphaerium (Musculium) problematicum Gabriel, 1939
Common name: Pea shell, pea clam, pill clam
Class Bivalvia
Infraclass Heteroconchia
Cohort Heterodonta
Megaorder Neoheterodontei
Order Sphaeriida
Superfamily Sphaerioidea
Family Sphaeriidae
Subfamily Sphaeriinae
Genus Sphaerium Scopoli, 1777
Type species: Tellina cornea Linnaeus, 1758. Europe.
Subgenus Musculium Link, 1807
Original name: Sphaerium problematicum Gabriel, 1939. In Gabriel, C. J. (1939). The Freshwater Mollusca of Victoria. Memoirs of the National Museum of Victoria 11: 100-139.
Type locality: Murray River, Merbein, Victoria.
Shallow burrower in sand/mud in river. Suspension and deposit feeder, larvae brooded.
Murray River, Merbein, Victoria.
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