Parapinnanema hawaiiensis

 

Contents

 

Rev: 04/04/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Parapinnanema Menu Ecosystem Functions and Services
Distribution Management
Return to Chromadoridae Menu Feeding  References
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Classification:

Chromadorea
  Chromadoria
   Chromadorida
    Chromadoridae
Euchromadorinae
       Parapinnanema hawaiiensis Semprucci & Sorensen, 2014
    Synonyms:
      
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Morphology and Anatomy:

 

 

 

Females:

  •  General appearance similar to the male.
  • Genital system didelphic, amphidelphic with reflexed ovaries
  • Musculature developed as a sphincter around the uterine chamber, with paired spermathecae.
  • Vulva elongated extending over 11 annules; vagina open.
  • There is a change of the direction of the epicuticle sculpture in the vulvar region.

Ref: Semprucci and Sorensen, 2014

  
   

Males:  

  • Body cylindrical with blunt head and conico-cylindrical tail
  •  Six internal labial papillae, six outer labial and four cephalic sensillae in a single circle,
  •  Cuticle with complex, battlement-like and heterogeneous ornamentation.
  • Cuticular annulation consists of two concentric layers of heavily sclerotized annules that are anteriorly directed on the anterior half of the body and posteriorly directed on the posterior body half.
  • Four fields devoid of ornamentation are present in the posterior body part (two laterally, one dorsally and ventrally).
  • The cuticular sheath of the anterior end of the buccal cavity is supported by  twelve buccal rugae.
  • Dorsal tooth is set into the wall of the buccal cavity, and relatively large.
  • Two small pointed ventral teeth and one lateral tooth.
  • Amphideal fovea transverse, about 0.5 the width of corresponding body diam.
  •  Pharynx cylindrical, slightly enlarged posteriorly with nerve ring at about 47% of length. Reproductive system monorchic. Spicules arcuate  with a small capitulum.
  • Lateral pieces of the gubernaculum Lshaped, with complex configuration.
  • Cloacal opening surrounded by about 8 incomplete annules with a thick, protruding border.
  • Anterior to the cloaca, a\the ventral body cuticle is modified into a raised area  comprised of about 11 annules .
  • Tail conico-cylindrical, spinneret present; non-annulated asymmetrical tail tip; no terminal setae observed.


Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

 

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Distribution:

Described from specimens collectyed off the coast of Honolulu at 10m depth by Dr. Theodor Mortensen in 1915 doring a Pacific Expedition.

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Feeding:

 
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Biology and Ecology:

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Life Cycle:

 

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters

 
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Ecosystem Functions and Services:

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Management:

 
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References:

Semprucci, F.A. and Sorensen, M.V. 2014. A new species of Parapinnanema (Nematoda, Chromadoridae) from Dr Theodor Mortensen’s Pacific Expedition 1914–16 with an identification key to the genus.  Zootaxa 3881(6):501-512

 

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Copyright 1999 by Howard Ferris.
Revised: April 04, 2023.