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File:Mesenchytraeus solifugus by Moore.png

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Summary

Description
English: Morphology of Mesenchytraeus solifugus (Oligochaeta: Enchytraeidae).
  1. A ventral view of the anterior twelve somites of the worm, showing the position of the spermathecal and male and female genital pores. ×20.
    • st – spermathecal pore at IV–V;
    • ♂ – male pore;
    • ♀ – female pore.
  2. Profile view of the anterior thirteen somites of the same specimien, showing the position of the setae bundles. The lips of the atrium are everted to form a penis. ×20.
    • Lettering as before.
  3. Semidiagrammatic figure of the reproductive organs contained in somites XI–XXII. ×35.
    • t – testes;
    • ss – left sperm sac;
    • rss – right rudimentary sperm sac;
    • sf – sperm funnel;
    • vd – sperm ducts (the right one, lying within the ovisac, is here represented diagrammatically as nearly straight; the left, lying in the coelom, is exhibited with nearly its actual arrangement of folds and coils);
    • se – saccus ejaculatorius;
    • a – atrium;
    • ♂ – male pore, here shown in a position much more lateral than is proper;
    • ov – ovaries;
    • ovs – the single ovisac, here represented as only partly filled with ova;
    • ♀ – female pore in a position more lateral than is natural.
  4. Ouitline of the supraoesophageal gland, from a dissection. ×48.
  5. Outline and optical section of a spermatheca showing the three diverticula and the external pore below; the upper end is broken and the ampulla not so large as usual. The poinit where the break is indicated is about where it becomes continuous with its fellow and opens into the oesophagus. ×48.
  6. A section through somite XVI, showing the relation of the sperm sac, ovisac and the sperm ducts to one another and the intestine and nerve cord. ×55.
    • ss – sperm sac filled with developing spermatozoa;
    • ovs – ovisac containing ova and the right sperm duct;
    • lvd – left sperm sac;
    • nc – nerve cord.
  7. Median vertical section through the anterior end. ×55.
    • m – mouth;
    • cp – cephalic pore;
    • eg – supraoesophageal ganglion;
    • ne – ventral nerve cord;
    • ph – pharyngeal pad.
  8. Section of a small portion of the body wall, from the preclitellar region, showing the remarkable development of pigment granules in the epidermis. ×440.
Date
Source Moore J. P. (1899). A snow-inhabiting enchytræid (Mesenchytræus solifugus Emery) collected by Mr. Henry G. Bryant on the Malaspina Glacier, Alaska. Proceedings of the Academy of Natural Sciences of Philadelphia 51 (1): 125–144.
Author John Persy Moore (1869–1965)
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current16:14, 8 December 2012Thumbnail for version as of 16:14, 8 December 2012635 × 955 (234 KB)Mithril=={{int:filedesc}}== {{Information | description = {{en|1=Morphology of ''Mesenchytræus solifugus'' (Oligochaeta: Enchytraeidae). # A ventral view of the anterior twelve somites of the worm, showing the position of the spermathecal and male and femal...

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