extinct species crab endemic discovered probably extinct description published lived contained united_states_army closely related species pacific_ocean lived inland spring differed relatives pattern spots relative sizes limbs description rectangular parallel sides males length millimetres width females long wide corners developed strong teeth chief difference species genus extensive pattern red spots animal green pair conspicuous white spots near ends shaped animal spot spots lateral margin legs marked larger spots walking legs shorter species spots animal underside including abdomen males bear patch containing ventral collected males females males sixteen held specimens living specimens taken died hours unknown reasons females laid eggs dying laying distribution ecology lived east town texas miles nearest ocean extinction crab united_states occurrence far ocean described curious species probably pleistocene springs originally produced water fed prairie dog town fork derives red beds strong effect flow approximately gallons imp gal minute pool wide surface altitude feet sea level depth wide widened slightly depth opening wide led completely filled water built salt springs january reduced load tonnes day contained spring rich comprising green algae species invertebrates including species single fish species springs increased species driven extinction including early december attempts find living individuals unsuccessful probably extinct description published closest relative shore crab lives coast pacific_ocean entire genus restricted pacific_ocean lives atlantic coasts south_america cape san rio state brazil argentina population introduced species native range atlantic coast united_states portland maine north_carolina english channel north_sea
Hemigrapsus estellinensis