Palaemon macrodactylus

This species is a compound, colonial ascidian, with small, flattened zooids embedded in a common matrix or tunic. The colony grows to form a thin, flat mat that can reach 30 cm in diameter, sometimes forming lobes. Individual zooids are oblong in shape, and measure 2-4 mm in length. Each zooid is independent, possessing its own atrial siphon that opens at the surface of the tunic. Zooids are randomly arranged. Tunic is clear and transparent.

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.

Symplegma reptans has been introduced to the Northeast Pacific, with confirmed records in southern California. In addition, this species has been reported from Hawaii. It is native to the Northwest Pacific, including Japan.

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

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.