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Date & Time : 28, December 2024 01:31
T.S. of Gill of Unio
- Composition : composed of two laminae, one inner other outer.
- Lamina : made of two lamellae,outer and inner, united at aterior,ventral and posterior edges but free dorsally.
- Inter-Lamellar junctions- form series of ventral compartments,also have afferent and efferent branchial vessels.
- Lamellae : composed of filamnts connected by inter filamentar junctions.
- Ostia : present between gill filaments.
Glochidium larva
- found in development of Bivalvia.
- Size : minute larva,measuring 0.1 to 0.4mm .
- Division : comprises head and mantle.
- Shell : comprises two triangular valves,united dorsally and free ventrally, ventral end of each valve is produced intoo curved hook bearing spines.
- Mantle : small,have sensory organs(brush like).
- Adductor muscle : well developed,extending between valves of base.
- It leads a parasitic life on a fish before metamorphosis into adult.
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