Trochammina hadai Uchio, 1962
This foraminifera species is characterized by an agglutinatid test comprised of multiple (4-5) chambers arranged in a spiral coil. Test rigid and trochoidal in overall shape, measuring 0.40-0.52 mm in diameter. Chambers inflated; final whorl subglobose. Walls grainy and coarse, built with sand grains and other foreign material. Deep umbilicus. Color is white, reddish brown, or yellowish brown.
In the Northeast Pacific, Trochammina hadai is similar to several other Trochammina spp., but is characterized by a rigid test, relatively high in profile and composed of a coarser grain.
Trochammina hadai has been introduced to the Northeast Pacific, with confirmed records from Alaska to California (McGann et al. 2000). This species is likely native to the Northwest Pacific, including Japan.
Marine; muddy or sandy sediments