Marine Protozoa from Woods Hole eBook

This eBook from the Gutenberg Project consists of approximately 78 pages of information about Marine Protozoa from Woods Hole.

KEY TO FAMILIES OF DINOFLAGELLIDIA.

   1.  No crossfurrow; two free flagella Family Prorocentridae

   2.  One or more cross-furrows 3

   3.  Cross-furrow nearly central Family Peridinidae
      (cf. Oxytoxum)

      Cross-furrow close to Family Dinophysidae
      anterior end

Several cross-furrows               Family Polydinidae
and flagella                        (One genus, Polykrikos.)

KEY TO MARINE GENERA OF PROROCENTRIDAE.

Diagnostic characters:  The transverse furrow is absent and the two flagella arise from the anterior end of the body.  The shell may be bivalved.

   1.  No tooth-like process dorsal Genus *_Exuviaella_
      to the flagellum

   2.  With tooth-like process dorsal Genus Prorocentrum
      to the flagellum

   * Presence at Woods Hole indicated by asterisk.

KEY TO MARINE GENERA OF PERIDINIDAE.

Diagnostic characters:  The cross-furrow is nearly central (see, however, Oxytoxum); the body may or may not have a shell; the shell may or may not be composed of distinct plates; the plates are distinguished as equatorial (i.e., bordering the cross-furrow), apical, and antapical, while still another, the “rhombic plate”, may be present, extending from the cross-furrow to the apex.

   1.  Without distinct shell Genus *_Gymnodinium_

      With a distinct shell 2

   2.  Shell not composed of definite 3
      plates

      Shell composed of definite plates 4

   3.  Cross-furrow replaced by Genus Ptychodiscus
      thin-skinned band

      Cross-furrow well defined; Genus Protoceratium
      reticulate markings raised
      on shell-surface

      Cross-furrow well defined; Genus *_Glenodinium_
      no markings

   4.  Two parts of shell equal or 5
      nearly equal

      Two parts of shell very unequal 11

   5.  With transverse flagellum in 6
      a distinct furrow

      Transverse flagellum not in a 10
      furrow

   6.  With horns, or with wing-like 7
      processes

      Without processes of any kind 9

   7.  Processes small, wing-like, Genus Diplopsalis
      around flagellum-fissure

      Processes horn-like 8

   8.  Anterior part with 7 equatorial Genus *_Peridinium_
      and 1 rhombic plates

      Anterior part with 5 equatorial Genus Gonyaulax
      and no rhombic plates

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Marine Protozoa from Woods Hole from Project Gutenberg. Public domain.
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