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Larvae (glochidia) of the freshwater mussel,  Westralunio albertisi  were obtained from the marsupia of a preserved female at the Western Australian Museum. Glochidial shells of  W. albertisi  are subtriangular and scalene in shape outline with a convoluted surface dotted with pores and have a protruding ventral apex. Glochidial shells (n = 60) measured 260.0 μm long (L) (±1.11 SE), 233.1 μm high (H) (± 1.32 SE), with a size of 246.6 μm (± 0.99 SE), hinge length (Hg) of 183.6 μm (± 0.99 SE), larval tooth length (LTL) of 53.6 μm (± 0.84 SE) and angle of obliquity (Á) of 12.9° (± 0.28 SE). Larval teeth are singular in each valve, lack microstylets, have convex or concave basal protuberances on opposing valves and terminate as blunt outward facing spoon-like to peg-like cusps. In comparison to  Westralunio carteri ,  W. albertisi  is smaller (d.f., 178;  P  &lt; 0.001) for L ( t  = 33.85), H ( t  = 12.80), Size ( t  = 28.98), Hg ( t  = 21.32), H/L ( t  = −15.06) and Hg/L ( t  = −4.21).  Westralunio albertisi  also has a more acute Á than  W. carteri  (d.f., 71;  t , 10.17;  P  &lt; 0.001), but displays no difference in LTL (d.f., 6;  t , 0.16,  P  = 0.44).

Description of the glochidia of Westralunio albertisi Clench, 1957 (Bivalvia: Unionida: Hyriidae) from the Fly River system, Papua New Guinea