Pacifastacus nigrescens was created in 1857.
Pacifastacus fortis was created in 1914.
Pterospoda nigrescens was created in 1898.
Crassispira nigrescens was created in 1845.
Callopistria nigrescens was created in 1915.
Tricypha nigrescens was created in 1909.
Cerastium nigrescens was created in 1837.
Scientific name: Dalbergia nigrescens,English name: Kratie rosewood,
Darren Fong has written: 'Distribution and abundance of California giant salamander (Dicamptodon ensatus) and signal crayfish (pacifastacus leniusculus) in the Upper Redwood Creek watershed, Marin County, California' -- subject(s): California giant salamander, Pacifastacus leniusculus
Scientific name: Dalbergia nigrescens,Russian name: Палисандр кратьэхский,English name: Kratie rosewood,Vietnamese name: Trắc đen, Cẩm lai đen, Quà nh quạch, Chà m trắc, Chà m đen
Adri an Rodri guez Garci a has written: 'Behavioral and electrophysiological evidence for the mechanisms involved in the detection of ionizing radiations by the crayfish Pacifastacus trowbridgii' -- subject(s): Physiological effect, Radiation
Three species of crayfish are present in Finland, Astacus astacus (Noble grayfish), Astacus leptodactylus (Danube crayfish) and Pacifastacus leniusculus (Signal crayfish), for your question about 'Why?', I can't answer anything else than the climate and water conditions are suitable for these species of crayfish.
Michael A. McKenzie-Carter has written: 'Uptake and retention of technetuim [i.e. technetium] by two freshwater species, the crayfish Pacifastacus leniusculus and the snail Juga silicula' -- subject(s): Radioactive substances in rivers, lakes, Technetium