Jul 312020
 

Cliff Henry found a number of case-bearing moth larvae (bagworms) on the walls of the National Trust, Giant’s Causeway offices 25th October 2018. Cases of these Psychids are not always easy to speciate and after Cliff brought them to me I circulated images to Ben Smart and J.R. Langmaid. Based on the larva they initially thought they were likely to be 11.002 175 Narycia duplicella. This was proved incorrect when I bred through a female in early 2019 which was wingless (Narycia has fully winged adults) and led me to believe it was in fact a Dahlica species. Images were circulated and a specimen sent to Ken Bond for dissection. Unfortunately the various structures examined did not lead to a definitive answer as the results were ambiguous.

As a last resort a freshly collected specimen was sent to the editor of Atropos journal who arranged DNA analysis to finally get a definitive identification. This finally confirmed the specimens as Dahlica lichenella. This was the original putative identification by Cliff! This species is new to Ireland.

11.005 79 Lichen Case-bearer Dahlica lichenella. Photo by Roy Anderson

Dave Allen

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