nightfly's picture

Arion ater?

Observed: 18th May 2010 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
18 May 10 na Trosk (2)
Description:
Identifications
Species interactions

No interactions present.

Species with which Great Black Slug (Arion ater) interacts

Comments

martinjohnbishop's picture

It is not that simple. There

It is not that simple. There are three species that may be confused and the genital anatomy is definitive. However, as this results in death of the specimen it is better to stroke them and see how they rock.

Arion vulgaris
http://www.habitas.org.uk/molluscireland/species.asp?ID=24
Rocking response absent

Arion rufus
http://www.habitas.org.uk/molluscireland/species.asp?ID=23
Rocking response is muted, and sometimes not exhibited at all

Arion ater
http://www.habitas.org.uk/molluscireland/species.asp?ID=18
Animal rocks strongly from side to side when stroked firmly on the back

nightfly's picture

Thanks very much for this

Thanks very much for this Martin, I will try to coax some to rock net time I see them.

Cathal.