Grasshoppers & allies
A disappointing year for this group with some expected species not recorded. Only 14 species were recorded compared with a record 19 in 2021. The normally numerous Common Groundhopper, a species of damp areas, wasn't recorded: the dry winter and spring may have affected its life-cycle. Seemingly less affected by the conditions, Common Earwig were first recorded on 19 Mar with the locally distributed Lesne's Earwig the next day, both found in leaf litter.
The first true grasshopper of the year was Meadow Grasshopper on 12 May, quickly followed by Lesser Cockroach on 13th, Grey Bush-cricket on 14th, Great Green Bush-cricket and Long-winged Conehead on 21st. All of these were first recorded in various instar or nymph stages, as was the first Speckled Bush-cricket found on 11 Jun.
By July adult grasshoppers and bush-crickets were at their most numerous with the first Mottled Grasshopper and Oak Bush-cricket on 1st. Encouragingly at least three Roesel's Bush-cricket were recorded from 5 July; heard rather than seen, they were located in Greenland Lake and the Back Meadow. The first site record was only in 2018, with the second only last year. Field Grasshopper appeared from 9th, Tawny Cockroach was found on 10th and Common Green Grasshopper, a recent arrival, were active from 21st.
Field Grasshopper could still be seen and heard on warm days into mid October and a late Dark Bush-cricket was seen on 23rd.
Fifteen species of slugs and snails were recorded, although dry conditions during the early part of year seem to have restricted numbers, especially slugs. Three new species were found all under wood, Draparnaud's Glass Snail Oxychilus draparnaudi on 2 Apr, Winter Semi-slug Vitrina pellucida on 13 Nov and Tawny Soil Slug Arion owenii on 20 Dec.
Three widespread earthworms were recorded during the year, Roundhead Worm Lumbricus rubellus, Brandling Worm Eisenia fetida and Compost Worm Eisenia veneta. The highlight was a freshwater leech Erpobdella testacea, discovered new for the Recording Area on 10 Dec.
The ubiquitous Common Rough Woodlouse Porcellio scaber and Common Shiny Woodlouse Oniscus asellus were often found alongside the striped woodlice Philoscia muscorum and less frequently Porcellio spinicornis. The second record of the small, blind, white Ant Woodlouse Platyarthrus hoffmannseggii was found in ant nest nest on 5 Jun and several Rosy Woodlouse Androniscus dentiger, new to the Recording Area, were found on 22 Oct.
Millipedes (and centipedes) are a very under-recorded group on the Warren and were also difficult to find this year, with just four species; Common Flat-backed Millipede Polydesmus angustus on 27 Feb, the millipedes Cylindroiulatus latestriatus and C. punctatus on 2 Apr and Striped Millipede Ommatoilus sabulosus from 5 May, the latter species is usually abundant across the site, but very few were seen this year.
Barkflies have a simple wing structure with most species under 6mm. Eight species were identified this year including Mesopsocus immunis, new for site on 24 Apr and both Ectopocus petersi and Trichopsocus clarus on 3 Jan.
These included a gorse thrip Odontothrips ulicis on 27 Feb, Scorpion-fly Panorpa communis from 3 May, Pond Olive Mayfly Cloeon dipterum on 15 May, a brown lacewing Micromus variegatus on 22 May, and two new caddisflies for the Recording Area; Limnephilus marmoratus on 19 May and Limnephilus lunatus on 1 Jul, both to light. Two new ant species were also found, both on the railway wall near Langstone Rock, the closely related, Formica fusca on 16 Jul and Formica cunicularia on 29 Jul.