Invertebrates of the Presidio
Created by Kenneth Rangel
Yellow Shore Crab
Hemigrapsus oregonensis is a small shore crab of the family Varunidae; it was formerly classified under the family Grapsidae. It is known under several common names, including yellow shore crab, hairy shore crab, green shore crab, mud-flat crab, and Oregon shore crab.
Northern Kelp Crab
Pugettia productus, known as the northern kelp crab or shield-backed kelp crab, is a species of crab in the family Epialtidae.
graceful rock crab
Metacarcinus gracilis (formerly Cancer gracilis) or commonly the graceful rock crab or slender crab, is one of only two members of the genus Metacarcinus whose chelae (claws) are white tipped, the other crab being M. magister (Dungeness crab).M. gracilis has been caught from Alaska to Bahía Magdelena, Baja California. Although M. ...more ↓
Green Crab
Carcinus maenas is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species". It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of 90 millimetres ...more ↓
Bay Ghost Shrimp
Neotrypaea californiensis (formerly Callianassa californiensis), the Bay ghost shrimp, is a species of ghost shrimp that lives on the Pacific coast of North America. It is a pale animal which grows to a length of 11.5 cm (4.5 in). One claw is bigger than the other, especially in males, and the enlarged claw is thought to have a function in mating. ...more ↓
red swamp crawfish
Procambarus clarkii is a freshwater crayfish species, native to the Southeastern United States, but found also on other continents, where it is often an invasive pest. It is known variously as the red swamp crawfish, red swamp crayfish, Louisiana crawfish, Louisiana crayfish or mudbug.
Scuds
Amphipoda is an order of malacostracan crustaceans with no carapace and generally with laterally compressed bodies. The name amphipoda refers to the different forms of appendages, unlike isopods, where all the thoracic legs are alike. Of the 7,000 species, 5,500 are classified into one suborder, Gammaridea. The remainder are divided into two or three further suborders. Amphipods ...more ↓
Hyalella sp.
Hyalella is a South and North American genus of mainly freshwater amphipods. The species in Hyalella include:
Cymothoidae
The Cymothoidae are a family of isopods. Several species are parasites, usually of fish. These include the bizarre "tongue-biter", Cymothoa exigua. Around 40 genera are recognised
