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Early development and metamorphosis of the tropical echinoidSalmacis bicolor, agassiz

  • R. Gopala Aiyar
Article
  • 11 Downloads

Summary

  1. 1.

    The full development ofSalmacis bicolor, a tropical form has been traced both in regard to the external characters and several internal features.

     
  2. 2.

    The amnion has been shown to arise very early in development.

     
  3. 3.

    The development of the larval skeleton has been traced.

     
  4. 4.

    The metamorphosis and the post-larval stages have been described.

     
  5. 5.

    The absence of sexual periodicity inSalmacis bicolor has been proved.

     

Keywords

Alimentary Canal Ciliated Band Pore Canal Dorsal Arch Stone Canal 
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.

Key to lettering

a.cil.ep.

Anterior ciliated epaulette

a.l.a.

Antero-lateral arms

a.l.r.

Antero-lateral rod

a.œ.s

Adult œsophagus

ad. stom.

Adult stomodæum

am.

Amnion

am.c.

Amniotic cavity

am.f.

Amniotic fold

amp.

Ampulla

arch.

Archenteron

a.z.t.

Azygos tube foot

b.r.

Body rod

cœ.

Cœlom

d.

Tooth

d.a.

Dorsal arch

d.s.

Dental sac

d.t.r.

Dorsal transverse rod

ep.c.

Epineural cavity

ep.f.

Epineural fold

hy.

Hydrocœl

int.

Intestine.

in. sp.

Inferior spiral

ip. mus.

Interpyramidal muscle

l.a.c.

Left anterior cœlom

l.hy.

Left hydrocœl

l.œs.

Larval œsophagus

l.p.c.

Left posterior cœlom

mes.

Mesenchyme

m.p.

Primary water pore

musc.

Muscles

nerve.

Nerve fibrils

o.sp.

Ordinary spicule

p.c.

Pore canal

p.sp.

Primary spicule

p.d.r.

Postero-dorsal rod

ped.

Pedicellaria

pig.

Pigment

p.l.p.

Postero-lateral processes

p.o.a.

Post-oral arm

pr.o.a.

Pre-oral arm

q.sp.

Quadrangular spine

r.a.c.

Right anterior cœlom

r.nerv.

Radial nerve

r.p.c.

Right posterior cœolom

r.r.

Recurrent rod

sp.

Spine.

su. sp.

Superior spiral

st.

Stomach

st.c.

Stone canal

t.f.

Tube feet

v.t.r.

Ventral transverse rod

w.v.r.

Water vascular ring

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Bibliography

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Copyright information

© Indian Academy of Sciences 1935

Authors and Affiliations

  • R. Gopala Aiyar
    • 1
  1. 1.The University Zoological Research LaboratoryMadras

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