Under Construction

Abraliopsis falco Young 1972

Richard E. Young and Kotaro Tsuchiya
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: Abraliopsis (Pfefferiteuthis)

Introduction

A. falco is a rather large member of the subgenus Pfefferiteuthis, reaching a length of at least 46 mm ML. It is very similar to Abraliopsis sp. A and Abraliopsis sp. P from the tropical Pacific and A. atlantica from the Atlantic Ocean.

Brief diagnosis:

An Abraliopsis (Pfefferiteuthis) ...

Characteristics

In addition to familial characters (listed on the Enoploteuthidae page) and generic characters (listed on the Abraliopsis page), Abraliopsis falco has:
  1. Arms
    1. Arms IV relatively long; ALI-ALIV = 55-79; formula - 4=2>3>1.
    2. Arms of males longer and hooks smaller than in females.
    3. Arms I-III with 16-23 hooks (females), and 24-34 (males).
    4. First basal hook, arms III, ventral series much larger than second basal hook of same series and about equal or larger in size to counterpart in dorsal series. Basal hooks 2-4 of arms III, dorsal series much larger than counterparts of ventral series.
    5. Arms IV with 21-26 hooks (females) and 39-45 (males, left) or 26-32 (males, right = hectocotylus). 
    6. Hectocotylus with two subequal-sized offset flaps.
    7. Proximal modified portion of hectocotylus with armature.
    8. Protective membrane and its spatulate trabeculae well developed on left arm IV, web-like; with minute conical papillae on trabeculae.
    9. Arms IV of males with hooks of varying sizes depending on margin and position along arm.
    10. Largest suckers of distal arm with 10-12 rounded to truncate teeth on distal margin of inner ring.
    11. Males with proximal hook of ventral margin greatly enlarged over succeeding hook of series (see arrow in image below).
      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


      Figure. Oral views of arms of A. falco. Left - Mature male, about 40 mm ML, off Southern California. Drawing from Young (1972). Middle, Right - Paratype, 30 mm ML, off Baja California. Photographs by R. Young.

  2. Tentacle clubs
    1. Large ventral hooks of manus about 2x height of dorsal counterparts; ventral series with 3-4 hooks, dorsal series with 2-4 hooks.
    2. Carpal flap absent; keel absent.
      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

      Figure. Tentacular club of Oral view of A. falco. Left - 40 mm ML, off Southern California. Drawing modified from Young (1972). Right - Ventral (left), oral (middle) and aboral (right) views, paratype, male, 39 mm ML, off Baja California. Photographs by R. Young.

  3. Photophores
    1. Ocular photophores: 5 photophores, terminal members "considerably" larger than middle 3. 
    2. Integumental photophores: 3 series on ventral head, 6 on ventral mantle.
      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

      Figure. Ventral views of the integumental photophores of A. falco, holotype, mature male, 37 mm ML, off Baja California. Left - Photograph of the preserved squid. Right - Outline drawing from previous photograph with all integumental photophores represented by colored dots. Red dots - Comples photophores. Blue dots - Non-complex photophores. Images by R. Young.

      Detailed information on the integumental photophores can be found here.

  4. Viscera
    1. Spermatangia receptacles: A large female (see photograph below) had spermatangia in the stellate pocket (pocket between stellate ganglia) but none in the dorsal-collar pocket which lacked pigmentation but showed many folds.
      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

      Figure. Dorsolateral view of an anterior region of the mantle cavity of A. falco, paratype, female, 41 mm ML, off Baja California, showing actual and potential pockets for storage of spermatangia. Photograph by R. Young.

  5. Table of measurements and counts
    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
    Table of measurements and counts

    Figure. Table from Young, 1972 (title modified).

Comments

Comparisons of all species in the subgenus can be found on the Abraliopsis (Pfefferiteuthis) page.

Distribution

Geographical Distribution

Type locality: Eastern North Pacific at 28°54'N, 118°08'W. The type series (9 squid) all came within a degree (latitude and longitude) of this locality. Considering the similarity with other species of the subgenus now known to exist, other literature records must be suspect for the present.

References

Okutani, T. 1974. Epipelagic decapod cephalopods collected by midwater tows during the EASTROPAC Expedition, 1967-1968 (systematic part). Bull. Tokai Reg. Fish. Res. Lab., 80:29-118.

Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the sea off southern California. Smiths. Contr. Zool., 97:1-159.

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 Abraliopsis falco
Location Off Southern California
Reference Young, R.E. 1972. The systematics and areal distribution of pelagic cephalopods from the sea off southern California. Smiths. Contr. Zool., 97:1-159.
Sex Male
View Ventral
Size 37 mm ML
Scientific Name Abraliopsis falco
Location Eastern tropical Pacific off Baja California at 2854'N, 11808'W
Specimen Condition Preserved
Sex Male
Life Cycle Stage Mature
View Ventral
Size 37 mm ML
Collection SBMNH 34957
Type Holotype
Image Use creative commons This media file is licensed under the Creative Commons Attribution License - Version 3.0.
Copyright ©
About This Page


University of Hawaii, Honolulu, HI, USA


Tokyo University of Fisheries, Tokyo, Japan

Page: Tree of Life Abraliopsis falco Young 1972. Authored by Richard E. Young and Kotaro Tsuchiya. 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:

Young, Richard E. and Kotaro Tsuchiya. 2013. Abraliopsis falco Young 1972. Version 03 November 2013 (under construction). http://tolweb.org/Abraliopsis_falco/19685/2013.11.03 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

Abraliopsis falco

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top