Jan Hamrsky: 2019 Calendar - Aquatic Insects
Jan Hamrsky: Darner dragonfly nymph (Aeshnidae) which is bright coloured and clean because it has just shed its old skin in order to grow larger. The new skin gardens and gets darker in few hours.
Jan Hamrsky: Diving beetle (Colymbetes fuscus) resting by the water surface.
Jan Hamrsky: Diving beetle larva (Hyphydrus ovatus)
Jan Hamrsky: Diving beetle (Hyphydrus ovatus) cracking on a stem of aquatic plant.
Jan Hamrsky: Diving beetle (Platambus maculatus)
Jan Hamrsky: Diving beetle larva (Graphoderus sp.)
Jan Hamrsky: Diving beetle (Cybister lateralimarginalis) male.
Jan Hamrsky: Diving beetle larva (Cybister lateralimarginalis)
Jan Hamrsky: Diving beetle larva (Cybister lateralimarginalis)
Jan Hamrsky: Diving beetle larva (Cybister lateralimarginalis)
Jan Hamrsky: Diving beetle (Platambus maculatus)
Jan Hamrsky: Diving beetle (Platambus maculatus)
Jan Hamrsky: Diving beetle (Platambus maculatus). Beetles often expose a bubble of air in order to gather molecules of oxygen from the surrounding water. Their air store must be refilled time to time, nevertheless this behavior increases the capacity of stored oxygen.
Jan Hamrsky: Diving beetle (Colymbetes fuscus)
Jan Hamrsky: Darner dragonfly nymph (Aeshnidae)
Jan Hamrsky: Darner dragonfly nymph (Aeshnidae) cleaning its labium after successful hunt.
Jan Hamrsky: Crawling water beetle larva (Haliplidae)
Jan Hamrsky: Crawling water beetle larva (Haliplidae)
Jan Hamrsky: Crawling water beetle larva (Haliplidae)
Jan Hamrsky: Crawling water beetle larva (Haliplidae)
Jan Hamrsky: Ciliated protozoans (Vorticella)
Jan Hamrsky: Case-building caddisfly larva (Arthripsodes cinereus) crawling at the bottom in its protective case made of sand grains.
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)
Jan Hamrsky: Case-building caddisfly larva (Trichoptera)