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Morphological and morphometrical description of the glochidia of Westralunio carteri Iredale, 1934 (Bivalvia: Unionoida:Hyriidae)

Klunzinger, M.W., Beatty, S.J.ORCID: 0000-0003-2620-2826, Morgan, D.L., Thomson, G.J. and Lymbery, A.J.ORCID: 0000-0002-0542-3446 (2013) Morphological and morphometrical description of the glochidia of Westralunio carteri Iredale, 1934 (Bivalvia: Unionoida:Hyriidae). Molluscan Research, 33 (2). pp. 104-109.

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Most freshwater mussel (Bivalvia: Unionoida) larvae (glochidia in Margaritiferidae, Hyriidae and Unionidae) are fish parasites. Knowledge of the larval morphology and the mechanism of release in freshwater mussels is useful in species systematics and ecology. Westralunio carteri Iredale, 1934 is the only unionoid from south-western Australia. Little information is available on its biology and its glochidia have never been described. The aim of this study was to describe the glochidia of W. carteri and method of their release. Glochidia within vitelline membranes were embedded in mucus which extruded from exhalent siphons of females during spring/summer; they then hatched from vitelline membranes but remained tethered by a larval thread and began characteristically ‘winking’. Shells (n = 120) were subtriangular, 308 μm long (±0.83 SE), 251μm high (±0.73 SE) and had a hinge length of 212μm (±0.78 SE). Larval teeth were singular with interlocking cusps and convex or concave basal protuberances on opposing valves.

Item Type: Journal Article
Murdoch Affiliation(s): Freshwater Fish Group & Fish Health Unit
School of Veterinary and Life Sciences
Publisher: Taylor and Francis
Copyright: © 2013 The Malacological Society of Australasia and the Society for the Study of Molluscan Diversity
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