Plesiopenaeus armatus

Alternate names: Cerataspis monstruosus

Author: Gray, 1828


General: Very large (can be over 20 cm in length), flared pleopods; this the first record from the Eastern Pacific. Legs on the abdomen are located at right angles laterally--only seen in penaeoids. Note that this name is still in flux. The name C. monstruosus was given to the larval form of this animal years ago. The name of the adult (P. armatus) will take precendence now that they are known to be the same animal. No ruling has been made by the ICZN as of Nov. 2018.

Geographic Information

Additional Information

Consulting taxonomist: Mary Wicksten, Professor, Texas A&M University, College Station, Texas.


Encyclopedia of Life

Tree of Life

World Register of Marine Species

National Center for Biotechnology Information

Bracken-Grissom, H.D., D.L. Felder, N.L. Vollmer, J.W. Martin, and K.A. Crandall (2012). Phylogenetics links monster larva to deep-sea shrimp. Ecology and Evolution, 2: 2367-2373. https:/

Wicksten, M. and L.A. Kuhnz (2015). A swimming deep-sea peneaoid shrimp photographed off California. California Fish and Game, 101: 146-148.

Citation: Plesiopenaeus armatus (Gray, 1828) Deep-Sea Guide (DSG) at http://dsg/ Monterey Bay Aquarium Research Institute (MBARI). Consulted on 2020-09-25.
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