Overview

Brief Summary

Introduction

Discoteuthis discus is most easily separated from its congeners by the arrangement of photophores and the form of the funnel locking-apparatus.

Brief diagnosis:

A Discoteuthis ...

  • with a diagonal groove in the funnel locking-apparatus.
  • with a photophore at the ventral tip of the mantle.

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Comprehensive Description

Characteristics

  1. Arms
    1. Arms weak, approximately subequal and 60-85% of ML.
    2. Large arm suckers with few low, broad, rounded teeth mostly on distal margin.
    3. Figure. Oral views of large arms suckers of D. discus, 45 mm ML. Left to right - Sucker of arms I-IV respectively. Drawing from Young and Roper (1969).

  2. Tentacles
    1. Dactylus with suckers in four series throughout.
    2. Medial suckers on manus of club globular relative to D. laciniosa (inner ring height ca 60% of diameter compared to 35% of diameter).

      Figure. Left - Side views of large manus suckers from D. discus (45 mm ML) and D. laciniosa (56 mm ML, paratype). Right - Oral views of a large sucker from manus and a much smaller sucker from the dactylus of D. discus, 45 mm ML, showing dentition. Drawings from Young and Roper (1969).

    3. Largest club suckers with numerous low, flattened or rounded teeth around entire inner ring.

      Figure. Oral view of the tentacular club of D. discus, 53 mm ML, holotype. Drawing from Young and Roper (1969).

  3. Head
    1. Beaks: Descriptions can be found here: Lower beak; upper beak.

  4. Funnel
    1. Locking-apparatus with diagonally positioned groove.

      Figure. Frontal view of the funnel locking-apparatus of D. discus, 45 mm ML. Drawing from Young and Roper (1969).

  5. Mantle
    1. Free anterior margin of mantle smooth (i.e., flaps lacking).

  6. Photophores
    1. At least 4 organs on margin of eyelid.
    2. One dark, round organ on ventral surface near posterior tip of mantle.
    3. Figure. Ventral view of posterior tip of mantle and fins of D. discus, 53 mm ML, holotype. Drawing modified from Young and Roper (1969).

  7. Gladius
    1. Conus absent.
    2. Figure - Ventral view of the gladius of D. discus, 53 mML, holotype, with cross-sections shown above. Drawing from Young and Roper (1969).

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Distribution

(sub)tropical Indo-West Pacific
  • UNESCO-IOC Register of Marine Organisms
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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The type locality is off Ghana, West Africa (03 deg 50'M. 02 deg 37'W) in the tropical East Atlantic. This species is known from the tropical and subtropical Atlantic and the central North Pacific (M. Seki, pers. comm.).

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Physical Description

Type Information

Holotype for Discoteuthis discus Young & Roper, 1969
Catalog Number: USNM 576214
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male;
Preparation: Isopropyl Alcohol
Year Collected: 1964
Locality: 100 Km SSW Of Cape Three Points, Ghana, Gulf of Guinea, North Atlantic Ocean
Depth (m): 750 to 750
Vessel: Pillsbury R/V
  • Holotype: Young, R. & Roper, C. F. 1969. Smithson. Contrib. Zool. 5: 5-9, pls. 3,4,7-9.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Paratype for Discoteuthis discus Young & Roper, 1969
Catalog Number: USNM 727513
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: male;
Preparation: Isopropyl Alcohol
Year Collected: 1966
Locality: St. Vincent and the Grenadines, Caribbean Sea, North Atlantic Ocean
Depth (m): 450 to 450
Vessel: Pillsbury R/V
  • Paratype: Young, R. & Roper, C. F. 1969. Smithson. Contrib. Zool. 5: 5-9, pls. 3,4,7-9.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Paratype for Discoteuthis discus Young & Roper, 1969
Catalog Number: USNM 727514
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Sex/Stage: female;
Preparation: Alcohol (Ethanol)
Vessel: Dana R/V
  • Paratype: Young, R. & Roper, C. F. 1969. Smithson. Contrib. Zool. 5: 5-9, pls. 3,4,7-9.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Depth range based on 6 specimens in 1 taxon.
Water temperature and chemistry ranges based on 6 samples.

Environmental ranges
  Depth range (m): 50 - 2100
  Temperature range (°C): 3.685 - 26.773
  Nitrate (umol/L): 1.114 - 36.074
  Salinity (PPS): 34.531 - 35.112
  Oxygen (ml/l): 2.902 - 5.113
  Phosphate (umol/l): 0.360 - 2.485
  Silicate (umol/l): 1.897 - 33.160

Graphical representation

Depth range (m): 50 - 2100

Temperature range (°C): 3.685 - 26.773

Nitrate (umol/L): 1.114 - 36.074

Salinity (PPS): 34.531 - 35.112

Oxygen (ml/l): 2.902 - 5.113

Phosphate (umol/l): 0.360 - 2.485

Silicate (umol/l): 1.897 - 33.160
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Life History and Behavior

Life Cycle

Life History

The smallest known D. discus is 16 mm ML (Young and Roper, 1969). At this size, the fins are about 60% of the ML and reach 98% of the ML in squid of 45 mm ML. Mature individuals are not known.

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Discoteuthis discus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There is 1 barcode sequence available from BOLD and GenBank.   Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen.  Other sequences that do not yet meet barcode criteria may also be available.

ACTCTATATTTCATTTTTGGTATTTGAGCAGGATTATTAGGAACTTCTTTA---AGACTTATAATTCGTACTGAATTAGGACAACCTGGTTCTTTACTAAATGAT---GACCAACTATATAATGTAGTAGTAACCGCCCACGGGTTTATTATAATTTTTTTCTTAGTCATACCTATTATAATTGGAGGGTTTGGTAATTGATTAGTACCTTTAATA---TTAGGGGCACCAGATATAGCATTCCCACGAATAAATAATATAAGATTCTGATTACTTCCTCCATCTTTAACCTTATTATTGGCCTCATCTGCTGTAGAAAGAGGAGCTGGCACAGGATGAACAGTATACCCCCCTTTATCAAGAAACCTTTCTCATGCAGGCCCTTCAGTAGACCTG---GCCATTTTTTCTTTACATTTAGCAGGTGTTTCTTCTATTTTAGGAGCAATTAACTTTATTACAACAATTTTAAACATACGTTGAGAAGGTTTACAAATAGAACGGCTTCCTCTTTTTGTATGATCTGTGTTTATTACTGCTATTCTTCTACTACTATCTTTACCTGTTTTAGCAGGA---GCTATTACTATACTTCTAACTGACCGAAACTTCAATACTACTTTTTTTGATCCTAGAGGGGGTGGGGATCCTATTTTATATCACCACTTA
-- end --

Download FASTA File
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Discoteuthis discus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Discoteuthis discus

Discoteuthis discus is a species of squid in the family Cycloteuthidae. They occur in the tropical and subtropical Atlantic Ocean and the central North Pacific. While mature specimens have not been found, the unnamed species Discoteuthis sp. A has been hypothesised as the mature form.

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Source: Wikipedia

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