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Thematic Collecting

@ Manchester Museum

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July 2017

A century of invasion – an unwelcome newcomer in northern waters

Entomology Manchester

Chinese_Mitten_Crab The Manchester Museum’s specimen of the male Chinese Mitten Crab (Eriocheir sinensis), collected from Ribble Estuary, Lancashire, in 2007.

The Chinese Mitten Crab (Eriocheir sinensis) is an accidentally imported species in the North Sea, which is considered one of the World’s 100 worst invasive species. The crab first appeared in northern Germany in 1912. It was unintentionally brought from China, apparently as a stowaway in the ballast tanks of cargo ships. Since 1912, the crab has dramatically spread over northern Europe. It was first recorded from Thames River in 1935. Now it is also established in the Rivers Humber, Medway, Tyne, Wharfe and Ouse, increasing its range throughout England and Wales by several tens of kilometres a year. See here about Mitten Crab recording project in the UK.

This crab lives both in fresh and salt waters. In autumn, adult crabs undertake a mass migration from freshwaters…

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Imported with bananas – what are you, a Banana Spider?

Entomology Manchester

In late January 2017, Ms Eleanor Smith of Wilmslow (Cheshire, UK) visited the Manchester Museum and brought a medium-sized spider (see Fig. 1) that was found alive in a bunch of bananas, in a supermarket (Lidl) near Wilmslow. As she was told, the bananas on which the spider was found were delivered from Colombia. Unfortunately, the spider was already dead because Eleanor had kept the jar with the spider in a fridge; far too cold for such a tropical creature. The specimen was found to belong to what is commonly known as ‘Banana Spiders’. It was a mature female that was identified as Sadala sp. in the family Sparassidae, huntsman spiders. The specimen is now deposited in the Manchester Museum’s spider collection (accession number G7585.1).

Fig_01_Sparassidae_Colombia
Fig.1Female of Sadala sp. (Sparassidae) imported to the UK from Colombia; the Manchester Museum (G7585.1).

Spiders that are incidentally imported with bananas are commonly…

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