Enoploteuthis jonesi Burgess 1982

Introduction

Enoploteuthis jonesi, a relatively small-sized species for the genus, attains 70mm DML. This species resembles the sympatrically occurring species E. higginsi, but separable by the small numbers and relatively narrow stripe arrangement of integumental photophores on the mantle and head. E. jonesi is also similar to E. anapsis from the Atlantic Ocean in the photophore patterns.

Brief diagnosis:

An Enoploteuthis (paraenoploteuthis) with...

• longitudinal photophore rows on head narrow, consisting mostly of one photophore width.
• longitudinal photophore rows on mantle narrower and more distinctive than in E. higginsi.
  

Characteristics

1. Tentacle
   1. Tentacle long, with distinct club.
   2. Carpal cluster oval.
   3. Two rows of different-sized hooks on manus.
   4. Four rows of suckers on dactylus.
      
      

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      Figure. Oral view of the tentacular club of E. jonesi, male, 47 mm ML, Hawaiian waters. Drawing from Burgess (1982).

2. Hectocotylus
   1. Hectocotylus with large truncate membranous flap on ventral edge and small semilunar one on the dorso-distal edge.
   2. Modified portion partially lacks armature.
      
      

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      Figure. Oral view of the tip of the hectocotylized right arm IV of E. jonesi, male, 47 mm ML, Hawaiian waters. Drawing from Burgess (1982).

3. Head
   
   1. Beaks: Descriptions can be found here: Lower beak; upper beak.
      
      
4. Integumental Photophores
   1. Ventral mantle with six longitudinal narrow stripes of integumental organs.
   2. Ventral head with four narrow longitudinal stripes of integumental organs that are interconnected at each end forming ring-like pattern.
      
      

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      Figure. Ventral view of the ventral head photophores of E. jonesi, paratype. Photograph by R. Young.

   3. Ventral side of arm III with a row of organs in about half of the arm length along the base of aobral keel.

Comments

This species closely resembles E. higginsi in almost all taxonomical characters. It is separable from E. higginsi by the small numbers of integumental photophores on the ventral head and mantle. In E. higginsi, each photophore stripe is formed by a few rows of organs with scattered intermediate organs while stripes are found by mostly by a single row of organs.

Life history

Eggs

Spawned eggs are ovoid, 0.94 x 0.77 mm, often with slightly greenish color, with a smooth chorion and distinct perivitellin space usually at both animal and vegetal poles.

Paralarva

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Figure. Ventral and dorsal views of paralarvae of E. jonesi. Drawings from Young and Harman (1985).

Distribution

Geographical distribution

This species is distributed in the equatorial Pacific waters from the Northwest Pacific and Hawaii to Melanesia (Burgess, 1982; Riddell, 1985; Tsuchiya, 1993).

References

Burgess, L.A. 1982. Four new species of squid (Oegopsida: Enoploteuthis) from the central Pacific and a description of adult Enoploteuthis reticulata. Fishery Bulletin, 80(4):703-734, 7 figures.

Riddell, D.J. 1985. The Enoploteuthidae (Cephalopoda: Oegopsida) of the New Zealand region. Fisheries Research Bulletin (NZ), 27:1-52.

Tsuchiya, K. 1993. Distribution and zoogeography of the family Enoploteuthidae in the Northwest Pacific. In: Okutani, T., O’Dor, R. K. and Kubodera, T. (eds.) 1993. Recent advances in fisheries biology (Tokai University Press. Tokyo). pp. 571-585.

Young, R. E. and R. Harman. 1985. Early life history stages of enoploteuthin squids (Cephalopoda, Teuthoidea, Enoploteuthidae) from Hawaiian waters. Vie et Milieu, 35: 181-202.