Overview

Brief Summary

Introduction

These are small (22 mm ML max.), muscular squids that occupy neritic waters often in association with small patch reefs and seagrass (Voss, 1953). In spite of the accessible habitat, the squid is rarely captured and little is known of its biology.

Brief diagnosis:

A loliginid ...

  • of small size and with posterior fin lobes; fins not joined posteriorly.
  • with club suckers on manus in two series.

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Comprehensive Description

Characteristics

  1. Arms
    1. Suckers in two series.

  2. Tentacles
    1. Club suckers on manus in two series; suckers on dactylus in four series or in two series.

      Figure. Oral view of the tentacular club of P. pulchella, 22 mm ML, female, holotype, off Florida Keys. Drawing from Voss (1953).

  3. Head
    1. Buccal supports without suckers.

  4. Fins
    1. Fins subterminal.
    2. Fins oval with free anterior and posterior lobes.

    Figure. Left - Ventral view of the posterior mantle and fins of P. pulchella, 22 mm ML, holotype, preserved. Photograph by R. Young. Right - Dorsal view of the same specimen. Drawing modified from Voss (1953).

  5. Photophores
    1. Absent.

Comments

The general shape varies greatly between species. P. pulchella is broad with relatively large arms and fins; P. bayeri and P. vossi are slender with small arms and fins. The latter two look look much like a young Doryteuthis.

Brakoniecki (1996) submerged the family Pickfordiateuthidae into the Loliginidae.

Figure. Dorsal view of P. bayeri in a shipboard aquarium.

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Ecology

Habitat

Depth range based on 7 specimens in 3 taxa.
Water temperature and chemistry ranges based on 3 samples.

Environmental ranges
  Depth range (m): 1 - 111.5
  Temperature range (°C): 20.901 - 24.318
  Nitrate (umol/L): 0.270 - 0.774
  Salinity (PPS): 34.257 - 36.618
  Oxygen (ml/l): 4.709 - 5.178
  Phosphate (umol/l): 0.035 - 0.446
  Silicate (umol/l): 1.046 - 4.219

Graphical representation

Depth range (m): 1 - 111.5

Temperature range (°C): 20.901 - 24.318

Nitrate (umol/L): 0.270 - 0.774

Salinity (PPS): 34.257 - 36.618

Oxygen (ml/l): 4.709 - 5.178

Phosphate (umol/l): 0.035 - 0.446

Silicate (umol/l): 1.046 - 4.219
 
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Wikipedia

Pickfordiateuthis

Pickfordiateuthis is a genus of tiny squid in the family Loliginidae. While four species have been assigned to the genus, only three have been named. No member is known to reach a maximum mantle length of more than 22 mm.[1]

The genus was erected in 1953 by Gilbert L. Voss, who named it in honour of biologist Grace Evelyn Pickford.[2] Voss placed the sole species known at the time, P. pulchella, in its own family, Pickfordiateuthidae, but this was sunk in synonymy with Loliginidae by Thomas Brakoniecki in his 1996 revision of Pickfordiateuthis.[3] Brakoniecki also described P. vossi as new and identified a third, unnamed species, P. sp. A.[3] A fourth species, P. bayeri, was added in 2001 by Clyde Roper and Michael Vecchione.[4]

References

  1. ^ Vecchione, M. 2008. Pickfordiateuthis Voss, 1953. Tree of Life Web Project.
  2. ^ Voss, G.L. 1953. A new family, genus and species of myopsid squid from the Florida Keys. Bulletin of Marine Science 2(4): 602–609.
  3. ^ a b Brakoniecki, T.F. 1996. A revision of the genus Pickfordiateuthis Voss, 1953 (Cephalopoda; Myopsida). Bulletin of Marine Science 58(1): 9–28.
  4. ^ Roper, C.F.E. & M. Vecchione 2001. Pickfordiateuthis bayeri, a new species of squid (Cephalopoda: Loliginidae) from the western North Atlantic Ocean discovered by submersible. PDF Bulletin of the Biological Society of Washington 10: 301–310.

Further reading

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Source: Wikipedia

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