Isistius plutodus Garrick & Springer, 1964

Open encyclopedia reference

The largetooth cookiecutter shark (Isistius plutodus) is a rare species of squaliform shark in the family Dalatiidae, reported from depths of 60–200 m (200–660 ft) at scattered locations in the Atlantic and Pacific Oceans. As its common name suggests, it is similar in appearance to the cookiecutter shark (I. brasiliensis) but has much larger lower teeth. This species reaches a maximum known length of 42 cm (17 in). The largetooth cookiecutter shark feeds by gouging out chunks of flesh from larger animals, including bony fishes, sharks, and marine mammals such as whales, dolphins, seals and killer whales and is able to take larger bites than I. brasiliensis. Little is known of its life history; it is thought to be a weaker swimmer than I. brasiliensis, and is presumably aplacental viviparous like the rest of its family. This shark is an infrequent bycatch of commercial trawl and longline fisheries, but is not thought to be much threatened by these activities.

Wikipedia contributors, Largetooth cookiecutter shark; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T22:55:01.941780+00:00. This reference remains separate from the taxonomic record.

Identity & source status

Scientific name

Isistius plutodus Garrick & Springer, 1964

Name authority

Garrick & Springer, 1964

Rank

species

Accepted status

accepted

Kingdom

Animalia

Phylum

Chordata

Class

Elasmobranchii

Order

Squaliformes

Family

Dalatiidae

Genus

Isistius

Extinction status

Not supplied by this source

Source habitat flags: Marine: yes · Freshwater: no · Terrestrial: no. These do not form a complete habitat description.

Classification family tree

Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.

1. domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
2. kingdomAnimalia
3. phylumChordata
4. subphylumVertebrata
5. infraphylumGnathostomata
6. parvphylumChondrichthyes
7. classElasmobranchii
8. subclassNeoselachii
9. infraclassSelachii
10. superorderSqualomorphi
11. orderSqualiformes Compagno, 1973
12. familyDalatiidae Gray, 1851
13. genusIsistius Gill, 1865
14. speciesIsistius plutodus Garrick & Springer, 1964

Close classified relatives

These entries share the source’s genus, Isistius. They are not necessarily the closest relatives established by molecular evidence.

Browse 9 records assigned to Dalatiidae.

Source literature & publication evidence

References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.

1. Garrick, J. A. F., & Springer, S. (1964). Isistius plutodus, a new squaloid shark from the Gulf of Mexico. Copeia, 1964 (no. 4): 678–682. https://doi.org/10.2307/1441443 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references

Origins, evidence & remaining research

Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.

Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.

Dataset citation & attribution

This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11

Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.

Stable key: col:3Q78K. Classification follows source parent identifiers. English common names may vary by region.