Oh my goodness! Unless you are a Tree of Life developer, you really shouldn't be here. This page is part of our beta test site, where we develop new features for the ToL, often messing up a thing or two in the process. Please visit the official version of this page, which is available here.
Under Construction

Doryteuthis (Amerigo) pealeii (Lesueur 1821)

Longfin inshore squid

Michael Vecchione and Richard E. Young
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Containing group: Doryteuthis


This is the common inshore squid of the northeastern U.S. Maximum length: 47 cm ML (male); males grow larger than females; sizes in western central Atlantic are considerably smaller than in northern waters - males: 30 cm maximum, less than 20 cm average; females: less than 13 cm ML.


  1. Arms
    1. Left ventral arm of mature males hectocotylized by modification of the distal third to fourth of arm, but the modification does not extend to arm tip; fewer than 12 of the suckers in dorsal row usually smaller than half the size of their counterparts in the ventral row; bases or pedicels of some of the modified suckers rounded, narrowly triangular.
  2. Head
    1. Eyes
      1. Eyes not unusually large, diameter of externally visible eyeball 8 to 18% mantle length, and diameter of dissected lens 2 to 6% mantle length.
    2. Beaks: Descriptions can be found here: Lower beak; upper beak.

  3. Mantle
    1. Mantle long, moderately slender, cylindrical, the posterior end bluntly pointed.
  4. Fins
    1. Fins rhomboid, their sides nearly straight.
  5. Gladius
    1. Gladius long, rather wide, feather-shaped.
    2. Ratio of greatest width of vane of gladius to greatest width of rachis 2.7 to 3.7 in females, 2.4 to 2.9 in males.
    3. edge of vane curved (sometimes straight in males), thin, rarely ribbed.

Geographic Distribution

Western Atlantic continental shelf and upper slope waters from Nova Scotia to Venezuela, including the Gulf of Mexico and the Caribbean Sea. Not occurring around islands, except as rare strays at islands close to continental shelf or slope.

Habitat and Biology

North of Cape Hatteras there is a summer, inshore-northerly spawning migration to shallow coastal and shelf waters, followed by an offshore-southerly retreat in fall and winter to continental slope waters; restricted in summer to surface and shallow water, but from 28 - 366 m depth in winter (peak concentrations at 100 - 193 m); adults are found on the bottom during day but leave the bottom at night, dispersing into the water column, and may appear at the surface (in summer or warm water).

Optimum temperatures 10 - 14 C, minimum 8 C.

North of Cape Hatteras, spawning occurs in coastal waters and bays during late spring and summer and offshore near the shelf break during winter and early spring.  Eggs laid in gelatinous finger-like strands, many of which are attached together in large masses (“sea mops”) to a solid substrate (rock, shells, man-made objects) at depths from a few to 250 m; planktonic paralarvae and juveniles are abundant in surface waters.

Food includes crustaceans (e.g. euphausids), fishes and squids.

Other Names for Doryteuthis (Amerigo) pealeii (Lesueur 1821)

Title Illustrations
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Scientific Name Doryteuthis (Amerigo) pealeii
Acknowledgements Vecchione, M., C.F.E. Roper, and M.J. Sweeney. 1989. Marine flora and fauna of the eastern United States. Mollusca: Cephalopoda. NOAA Tech. Rep. NMFS 73:1-23.
Scientific Name Doryteuthis pealeii
Specimen Condition Live Specimen
View Dorsal
Image Use creative commons This media file is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0.
Copyright ©
About This Page

National Museum of Natural History, Washington, D. C. , USA

University of Hawaii, Honolulu, HI, USA

Correspondence regarding this page should be directed to Michael Vecchione at

Page: Tree of Life Doryteuthis (Amerigo) pealeii (Lesueur 1821). Longfin inshore squid. Authored by Michael Vecchione and Richard E. Young. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Vecchione, Michael and Richard E. Young. 2010. Doryteuthis (Amerigo) pealeii (Lesueur 1821). Longfin inshore squid. Version 02 September 2010 (under construction). http://tolweb.org/Doryteuthis_%28Amerigo%29_pealeii/52727/2010.09.02 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

This page is a Tree of Life Leaf Page.

Each ToL leaf page provides a synopsis of the characteristics of a group of organisms representing a leaf at the tip of the Tree of Life. The major distinction between a leaf and a branch of the Tree of Life is that a leaf cannot generally be further subdivided into subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box

Doryteuthis (Amerigo) pealeii

Page Content

articles & notes



Explore Other Groups

random page

  go to the Tree of Life home page