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Zoomorphologie

, Volume 95, Issue 3, pp 235–249 | Cite as

Ultrastructure of coelomic organization in annelids

I. Archiannelids and other small polychaetes
  • Margaret E. Fransen
Article

Summary

A comparative ultrastructural study of trunk segments of a variety of small polychaetes (body diameter less than 250 μrn) was undertaken to determine whether small body size is correlated with deviations from the typical annelid pattern of coelomic organization. Peritoneum is never found covering oblique or parapodial muscles traversing the body cavity. Aside from this, two major patterns of body cavity organization are seen: 1. spacious body cavity with varying extent of peritoneal lining (complete, partial, absent) and 2. the body tending toward the acoelomate condition, as a result of the expansion of lining cells or the lack of initial cavity formation. The significance of these anatomical variations is discussed with respect to functional and phylogenetic considerations.

Keywords

Body Size Developmental Biology Anatomical Variation Small Body Ultrastructural Study 
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

BL

Basal lamina

CC

Coelenchyme

CM

Circular muscle

CO

Coelom

CT

Cuticle

DM

Dorsal mesentery

DV

Dorsal blood vessel

EP

Epidermis

HC

Hemocyte

HD

Hemidesmosome

IN

Intestine

IS

Intestinal sinus

LM

Longitudinal muscle

NC

Ventral nerve cord

NE

Nephridium

OM

Oblique muscle

OO

Oocyte

PT

Peritoneum

ST

Stomach

VM

Ventral mesentery

VV

Ventral blood vessel

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Margaret E. Fransen
    • 1
  1. 1.Department of ZoologyUniversity of North CarolinaChapel HillUSA

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