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Data: Characterisation of the haemocytes of leaf oysters, Isognomon ephippium (Linnaeus, 1758)
Dataset   Open access

Data: Characterisation of the haemocytes of leaf oysters, Isognomon ephippium (Linnaeus, 1758)

Chamara Benthotage, Kai G. Schulz, Victoria J. Cole, Endurance E. Ewere and Kirsten Benkendorff
Taylor & Francis
12/05/2025
DOI: https://doi.org/10.6084/m9.figshare.29040403
Appears in  Recent Faculty of Science and Engineering Publications
url
https://doi.org/10.6084/m9.figshare.29040403View
CC BY V4.0,  Open

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Abstract

Bivalvia Isognomonidae Haemocyte counts SEM Flow cytometry
Characterisation of the immune system of bivalves can be a key to understanding their adaptation and resilience to the environment. This study is the first to characterise the haemocytes of the Family Isognomonidae. Three different types of haemocytes, granular cells, hyalinocytes and blast-like cells, were identified by light microscopy in leaf oysters Isognomon ephippium (Linnaeus, 1758), with relative proportions of 8.4% (±2.3%) 76.2%, (±1.9%), and 15.3% (±1.6%), respectively, determined by flow cytometry. Scanning electron micrographs illustrated the outer appearance of the major haemocyte types, including dendritic-like cytoplasmic extensions on activated haemocytes. The total haemocyte count (THC) and bacterial counts in the haemolymph of leaf oysters, as well as the bacterial load in the source water, were compared across three estuaries with differing water quality on the north coast of New South Wales, Australia. THC ranged from 3.89 × 105–2.89 × 106 cells/mL in leaf oysters and significantly differed among three sites. THC increased with nitrogen, but decreased with higher bacterial loads in the water, which in turn correlated to other water quality parameters. This study provides baseline information on the leaf oyster immune system to facilitate future monitoring of Isognomon health in relation to environmental stressors.

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