Slender-horned Ground-hopper
Tetrix tenuicornis
The Slender-horned Ground-hopper is a small species of grasshopper within the family Tetrigidae. It is characterized by a pronotum that extends backwards, covering almost the entire abdomen. Its coloration is typically grey to brown, providing camouflage on open soil. The species is named after its antennae, which are significantly longer and more slender than those of related species.
Details
Identification
Antennae about 1.5 times as long as the head height; pronotum usually reaching the tip of the abdomen; mid-femora about as wide as the visible part of the forewings.
Social behavior
Solitary; does not exhibit distinct social behavior or swarming.
Diet
Feeds primarily on algae, mosses, lichens, and organic detritus found on the ground.
Spawning substrate
Eggs are laid in moist soil, moss cushions, or between plant roots.
Overwintering
Overwintering usually occurs as a late-stage larva (nymph) or as an adult in the leaf litter.
Ecology
Ecological role
Primary consumer and decomposer of algae and moss; serves as prey for invertebrates and small vertebrates.
Natural predators
Birds, spiders, ground beetles, and small reptiles such as the sand lizard.
Competitor species
Other ground-hopper species such as Tetrix undulata or Tetrix subulata in overlapping habitats.
Ecosystem service
Contribution to the nutrient cycle by consuming pioneer vegetation and detritus.
Threats
Loss of pioneer habitats due to natural succession, afforestation, or intensive agricultural use.
Scientific profile
Profile
Distinguishing features
Characteristic are the relatively long antennae, with middle segments 3-4 times as long as wide (distinction from T. undulata). The pronotum is usually long and clearly extends beyond the hind knees. The mid-femora are narrower than the visible part of the forewings (tegmina).
Habitat
Prefers dry-warm to moderately moist sites with sparse vegetation. Typical habitats include quarries, gravel pits, sandy fallow lands, dry grasslands, forest edges, and clear-cuts. Considered a pioneer species of early successional stages.
Diet
Herbivorous and detritivorous; feeds primarily on algae, mosses, lichens, and organic detritus on the soil surface.
Role in food web
Primary consumer and decomposer; serves as prey for various invertebrates (e.g., ground beetles, spiders) as well as small vertebrates like lizards and insectivorous birds.
Protection & threats
Main threats
Natural succession (scrub encroachment and afforestation of open areas), infilling of quarries and gravel pits, abandonment of dynamic land-use processes.
Population trend
Widespread in Germany and currently classified as stable, but locally threatened by the loss of pioneer sites.
Conservation measures
Maintenance and creation of bare soil patches through targeted management (e.g., topsoil stripping, scrub removal), promoting dynamics in extraction sites.