Skip to main content Skip to main navigation menu Skip to site footer
Published: 2020-10-15

A new crab-associated amphipod of the genus Isaeopsis Barnard, 1916 (Amphipoda: Senticaudata: Ischyroceridae) from southern Chile

Área de Zoología de Invertebrados, Museo Nacional de Historia Natural de Chile, Casilla 787, Correo Central, Santiago, Chile.
Facultad de Ciencias, Instituto de Ciencias Marinas y Limnológicas, Laboratorio Costero de Calfuco, Universidad Austral de Chile, Valdivia 5090000, Chile. Centro de Investigación de Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia 5090000, Chile.
Crustacea Taxonomy Commensal amphipods Los Lagos Region


A new species of amphipod of the family Ischyroceridae is described. Isaeopsis chiloensis n. sp. was discovered in association with the cancrid species Metacarcinus edwardsii and Romaleon setosum, in the inner sea around Chiloé Island, in Southern Chile. This represents the second species of the genus Isaeopsis, a group formerly known only from South African waters.

                The new species is characterized principally by the structure of the gnathopods, the propodus of pereopods 3–7 and the ornamentation of the outer ramus of uropod 3. The male gnathopod 2 has a prominent thumb in the posteroproximal margin of the propodus and the pereopods 3–7 are subchelate with the palm armed by a row of at least five strong setae. In addition, the apex of the outer ramus of uropod 3 bears a comb with more than thirty fine teeth. Isaeopsis chiloensis n. sp. is completely described and a series of illustrations is provided.



  1. Barnard, K.H. (1916) Contributions to the crustacean fauna of South Africa. 5. The Amphipoda. Annals of the South African Museum, 15, 105–302.

    Barnard, J.L. (1970) Sublittoral Gammaridea (Amphipoda) of the Hawaiian Islands. Smithsonian Contributions to Zoology, 34, 1–286.

    Barnard, J.L. (1973) Revision of Corophiidae and related families (Amphipoda). Smithsonian Contributions to Zoology, 151, 1–27.

    Barnard, J.L. & Karaman, G.S. (1991) The families and genera of marine gammaridean Amphipoda (Except marine gammaroids). Records of the Australian Museum, 13 (1y2), 1–866.

    Bell, T. (1835) Observations on the genus Cancer of Dr. Leach (Platycarcinos Latr.), with descriptions of three new species. Proceedings of the Zoological Society of London, 1835 (30), 86–88.

    Boeck, A. (1871) Crustacea Amphipoda borealia et arctica. Forhandlinger i Videnskabs-Selskabet i Christiania, 1870, 83–280.

    Coleman, C.O. (2003) “Digital inking”: How to make perfect line drawings on computers. Organism, Diversity and Evolution, Electronic Supplement, 14, 1–14.

    Coleman, C.O. (2006) Substituting time-consuming pencil drawings in arthropod taxonomy using stacks of digital photographs. Zootaxa, 1360 (1), 61–68.

    Conlan, K.E. (1990) Revision of the crustacean amphipod genus Jassa Leach (Corophioidea: Ischyroceridae). Canadian Journal of Zoology, 68, 2031–2075.

    Conlan, K.E. (1995) Thumbing doesn’t always make the genus: revision of Microjassa Stebbing (Crustacea: Amphipoda: Ischyroceridae). Bulletin of Marine Science, 57 (2), 333–377.

    Conlan, K.E. (2007) Alatajassa (Amphipoda, Corophiidea), a new genus from the Pacific Coast of North America. Crustaceana, 80 (11), 1339–1354.

    Figueroa-Muñoz, G., Retamal, M., De Los Ríos, P., Esse, C., Pérez-Schultheiss, J., Vega-Aguayo, R., Boyero, L. & Correa-Araneda, F. (2020) Scavenging crustacean fauna in the Chilean Patagonian sea. Scientific Reports, 10, 5940.

    Just, J. (2009) Ischyroceridae. In: Lowry, J.K. & Myers, A.A. (Eds.), Benthic Amphipoda (Crustacea: Peracarida) of the Great Barrier Reef, Australia. Zootaxa, 2260, pp. 463–486.

    Krøyer, H. (1838) Gronlands amfipoder beskrevne af Henrik Kröyer, Det Kongelige Danske Videnskabernes Selskabs Naturvidenskabelige og Mathematiske Afhandlinger, 7, 229–326.

    Latreille, P.A. (1816) Amphipoda. In: Nouveau Dictionaire d’histoire naturelle, appliquée aux Arts, à l’Agriculture, à l’Économie rurale et domestique, à la Médecine, etc. Par une société de Naturalistes et d’Agriculteurs. Vol. 1. 2nd Edition. Deterville, Paris, pp. 467–469.

    Leach, W.E. (1814) Crustaceology. The Edinburgh Encyclopaedia, 7, 383–437.

    Lowry, J.K. & Myers, A.A. (2013) A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda). Zootaxa, 3610 (1), 1–80.

    Milne Edwards, H. (1837) Histoire naturelle des crustacés. L’Institute, Paris, 5, 225.

    Molina, J.I. (1782) Saggio sulla storia naturale del Chili. S. Tommaso d’Aquino, Bologna, 367 pp.

    Myers, A.A. (1995) The Amphipoda (Crustacea) of Madang Lagoon: Aoridae, Isaeidae, Ischyroceridae and Neomegamphopidae. Records of the Australian Museum, Supplement 22, 25–95.

    Myers, A.A. & Lowry, J.K. (2003) A phylogeny and a new classification of the Corophiidea. Journal of Crustacean Biology, 23 (2), 443–485.

    Schellenberg, A. (1931) Gammariden und Caprelliden des Magellangebietes, Sudgeorgiens und der Westantarktis. Further Zoological Results of the Swedish Antarctic Expedition 1901-1903, 2 (6), 1–290.

    Souza-Filho, J.F. & Serejo, C.S. (2014) On the phylogeny of Ischyroceridae (Amphipoda, Senticaudata, Corophiida), with the description of a new genus and eight new species from deep-sea Brazilian waters. Zoological Journal of the Linnean Society, 170, 34–85.

    Stebbing, T.R.R. (1888) Report on the Amphipoda collected by H.M.S. Challenger during the years 18731876. Report on the Scientific Results of the Voyage of H.M.S. Challenger 1873–76, Zoology, 29, 1–1737.

    Stebbing, T.R.R. (1899) Revision of Amphipoda (continued). Annals and Magazine of Natural History, Series 7, 4, 205–211.

    Stephensen K. (1944) Crustacea Malacostraca. VIII. (Amphipoda IV). Danish Ingolf Expedition, 3 (13), 1–51.

    Vader, W. (1983) Prehensile pereopods in gammaridean Amphipoda. Sarsia, 68 (2), 139–148.

    Vader, W. (1995) Liljeborgia species (Amphipoda, Liljeborgiidae) as associates of hermit crabs. Polskie Archiwum Hydrobiologii, 42 (4), 517–525.

    Vader, W. & Krapp, T. (2005) Crab-associated amphipods from the Falkland Islands (Crustacea, Peracarida). Journal of Natural History, 39 (33), 3075–3099.

    Vader, W. & Myers, A.A. (1996) Amphipods living in association with hermit crabs in S.E. Australia. I. Five new Ischyroceridae. Bolletino del Museo Civico di Storia Naturale di Verona, 20, 263–292.

    Vader, W. & Tandberg, A.H.S. (2015) Amphipods as associates of other Crustacea: a survey. Journal of Crustacean Biology, 35 (4), 522–532.