AN OBSERVATION ON INTRACAPSULAR AND POST-EMBRYONIC PHASES OF RIVER NERITE (Theodoxus fluviatilis)

Year 2018, Volume: 4 Issue: 1, 46 - 54, 01.01.2018

Mehmet Güler , Deniz Çoban , Birsen Kırım

Abstract

The river nerite (Theodoxus fluviatilis, Linnaeus, 1758) is one of the most common gastropod grazer species in
Europe inland and brackish waters. Its feeding activity significantly impacts
on periphyton which has a decisive role on the water parameters and the
population dynamics. In the present study, reproductive outputs and larval
phases of the river nerites were examined via field
collected and laboratory cultivated samplings. The length of capsules laid
by adults was between 0.7 and 1.1 mm. Viable embryos were detected first on the
33^rd day post-spawning. After few development phases embryo reached
a ready-to-hatch phase with completely developed foot and pigmented protoconch
before hatching. There was never more than one embryo per capsule. The earliest
hatching was observed on the 53^rd day of spawning. But most of the
embryos did not hatch even they were fully developed. The shell length of the
hatchlings was about 0.8 and the width was 0.6 mm. It was estimated that the
length of a newly hatched crawling juvenile can be about 1/7 of the length of
an adult.

Keywords

Gastropod, Neritidae, Egg capsule, Embryonic development

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