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Journal of Comparative Physiology A

, Volume 161, Issue 6, pp 881–890 | Cite as

Tailflipping ofMunida quadrispina (Galatheidae): conservation of behavior and underlying musculature with loss of anterior contralateral flexor motoneurons and motor giant

  • Linda J. Wilson
  • Dorothy H. Paul
Article

Summary

  1. 1.

    We analyzed tailflipping behavior, motor patterns, underlying musculature and flexor motoneurons inMunida quadrispina (Galatheidae) and compared them with these parameters in crayfish to reveal evolutionary changes in the nervous system which might have occurred in conjunction with loss of giant interneurons and change in body form and posture.

     
  2. 2.

    The form of tailflipping (videoanalysis) varies with respect to abdomen extension angle, amount of uropod promotion, and pereopod positioning (Fig. 1). In ‘full’ tailflips, the uropods are maximally promoted throughout active flexion; the first 3 pairs of pereopods are held forward. In ‘truncated’ tailflips, abdominal segments 4–6 do not extend, uropods do not promote and pereopods either move actively or trail passively. Flexion latency (=extension duration) covaries with extension period, but does not vary systematically with extension amplitude (Fig. 3C, D).

     
  3. 3.

    Flexor-burst latencies (electromyograms) in segments 2–4 vary independently of extensor-burst period; in segment 5 they covary with period (Figs. 2, 3 A, C).

     
  4. 4.

    M. quadrispina has slow flexor motoneurons identical to those in crayfish but lacks homologs of the motor giants and of any FAC motoneurons (Figs. 4, 5; Table 1).

     
  5. 5.

    Quantitative comparison of the relative sizes of fast flexor and extensor musculatures inM. quadrispina and in crayfish revealed only one significant difference between the 2 animals: the extensor muscles are approximately the same size in all segments in crayfish whereas inM. quadrispina they are largest in segment 5 (Fig. 6; Table 2).

     
  6. 6.

    The major conclusion is that whereas nongiant tailflipping behavior (overt behavior and motor pattern) and underlying musculature were conserved in evolution ofM. quadrispina, flexor motoneurons underwent reductions compared with crayfish (andGalathea strigosa). Loss of FAC motoneurons perhaps resulted from chance loss of certain neuroblasts which was tolerated because other motoneurons still innervated the affected muscles.

     

Keywords

Body Form Major Conclusion Extensor Muscle Motor Pattern Abdominal Segment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

f1

smallest slow flexor motoneuron

FAC

anterior contralateral group of FF motoneurons

FF

fast flexor

FI

peripheral inhibitor of FF muscles (an FMC neuron)

FMC

medial contralateral group of FF motoneurons

FPI

posterioripsilateral group of FF motoneurons

G1...G6

abdominal ganglion 1...6

MoG

motor giant neuron (an FMC neuron)

MoGH

homolog of MoG

N3

3rd segmental nerve (innervates flexor musculature)

S1...S6

abdominal segment 1....6

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Linda J. Wilson
    • 1
  • Dorothy H. Paul
    • 1
  1. 1.Biology DepartmentUniversity of VictoriaVictoriaCanada

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