Depressed Pygmy Grasshopper
Tetrix depressa
The Depressed Pygmy Grasshopper is a small orthopteran species belonging to the family Tetrigidae. It is primarily distributed across the Mediterranean region but is increasingly expanding into Central Europe due to climate change. It is characterized by a flat, laterally widened pronotum that often extends beyond the abdomen. The species prefers open, sparsely vegetated habitats such as gravel banks or dry grasslands.
Details
Identification
Broad, flat pronotum with a distinctly raised median keel; very short antennae; hind wings usually fully developed; coloration mostly grey or brownish marbled.
Social behavior
Solitary species that does not form social structures or swarms.
Diet
Feeds primarily on algae, mosses, lichens, and organic detritus on the ground.
Hunting strategy
None (herbivorous/detritivorous).
Spawning substrate
Moist soil, algal mats, or moss.
Overwintering
Overwintering usually occurs as a larva or adult in leaf litter or moss cushions.
Ecology
Ecological role
Primary consumer and decomposer of organic material; serves as prey for small predators.
Natural predators
Birds, spiders, ground beetles, small reptiles, and amphibians.
Competitor species
Other pygmy grasshopper species such as Tetrix subulata or Tetrix tuerki.
Ecosystem service
Contribution to the nutrient cycle through the decomposition of detritus and algae.
Threats
Destruction of floodplains, river straightening, and the loss of open ground patches due to succession.
Scientific profile
Profile
Distinguishing features
Characterized by a very broad and flattened pronotum compared to other Tetrix species, typically extending well beyond the tip of the abdomen (macronotal). The median keel of the pronotum is distinctly raised in the anterior third. The lateral lobes of the pronotum are bent at right angles. The species appears more robust and broader than related species.
Habitat
Xerothermic pioneer sites with sparse vegetation; stony or sandy soils, gravelly riverbanks, quarries, sand pits, dry grasslands, and Mediterranean garrigue. Prefers habitats with a high proportion of bare soil.