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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Coxliella

Coxliella Brandt, 1907

[ref. ID; 3596]
Lorica elongated vase-shaped, with or without an aboral horn, with spiral annular bands; oral margin entire or irregularly uneven; wall sometimes imperfectly reticulated, composed of an inner and an outer lamella, each usually separated. (ref. ID; 3596)

[ref. ID; 3597]
This genus is divided into two subgenera, Coxliella Kofoid & Campbell and Protocochliella Jorgensen, from the structure of the wall. The former is composed of entirely separated laminae with a distinct secondary structure, and the latter is made up of imperfectly separated ones without highly developed secondary structure. (ref. ID; 3597)
  1. Coxliella ampla (ref. ID; 4669) or (Jorgensen) Brandt (ref. ID; 3596) reported author and year? (ref. ID; 4410)
  2. Coxliella annulata (Daday) (ref. ID; 3596, 4669) reported author and year? (ref. ID; 4410, 4464)
  3. Coxliella decipiens (ref. ID; 4410)
  4. Coxliella intermedia (ref. ID; 7039)
  5. Coxliella laciniosa (Brandt) (ref. ID; 3597)
  6. Coxliella longa (Brandt) Laackmann (ref. ID; 3597)
  7. Coxliella mariana Hada, 1938 (ref. ID; 3597 original paper)
  8. Coxliella pseudannulata (Jorgensen, 1901) (ref. ID; 1868)

Coxliella ampla (ref. ID; 4669) or (Jorgensen) Brandt (ref. ID; 3596) reported author and year? (ref. ID; 4410)

Descriptions

Lorica sac-shaped, 1.25-2.35 oral diameters in length; oral margin usually entire; bowl nearly cylindrical; aboral end rounded or subacute; wall with 6-10 spiral turns, composed of slightly separated hyaline laminae, reticulated structure almost invisible. (ref. ID; 3596)
This species has short lorica unlike C. annulata. Furthermore, the aboral end of the lorica is less spherical. The lorica is about 2.2 oral diameters in length. (ref. ID; 4669)

Comments

The lorica of specimens in Akkeshi Bay is very variable in size and shape; some individuals are elongated and cylindrical like Cyttarocylis spiralis figured by Meunier (1910), but some are stout and similar to the figure given by Jorgensen (1924). Although the diameter of the oral aperture is approximately equal in most species in the Tintinnoinea, that of this species shows a considerable variation. The specimens of he North Sea and the Arctic Ocean have a rounded aboral end, but some of Akkeshi Bay bear a small subacute aboral process. The species differs from C. annulata (Daday) in its smaller size and the simpler wall, and from C. pseudoannulata (Jorgensen) in the more weakly developed reticulation and the imperfectly separated wall. (ref. ID; 3596)

Measurements

Length 65-165; oral diameter 52-89 um. (ref. ID; 3596)
Length 168.0 um; oral diameter 77.0 um. (ref. ID; 4669)

Coxliella annulata (Daday) (ref. ID; 3596, 4669) reported author and year? (ref. ID; 4410, 4464)

Descriptions

This species is characterised by the presence of a tall cylindrical lorica which is slightly widened posteriorly; however, the aboral end is less pointed. Many spiral turns are seen running along the entire region of the lorica. The lorica is about 2.7 oral diameters in length. (ref. ID; 4669)

Measurements

Length, 273 um; oral diameter 102.0 um (n=2). (ref. ID; 4669)

Coxliella longa (Brandt) Laackmann (ref. ID; 3597)

Descriptions

Lorica stout bullet-shaped, 1.5-1.8 oral diameters in length, nearly cylindrical in its anterior two-thirds, then conical (80-90 degrees) in its posterior one-third; oral rim irregular; aboral end often more or less curved, bluntly or acutely pointed; 10-27 annulated lines seen in front view; wall composed of completely separated lamellae having a fine reticulation. (ref. ID; 3597)

Comments

The species differs from C. ampla (Jorgensen) in bearing perfectly separated laminae and from C. laciniosa (Brandt) in being cylindrical in the upper main part and having no well-developed aboral horn. (ref. ID; 3597)

Measurements

Length 120-150; oral diameter 75-85 um. (ref. ID; 3597)

Coxliella mariana Hada, 1938 (ref. ID; 3597 original paper)

Descriptions

Lorica small, convex conical in general contour changing from 20 degrees to 100 degrees, 1.2-1.4 oral diameters in length; oral margin smooth; aboral end somewhat tapering to a pointed terminal; wall with 8 spiral turns, partially separated, hyaline, reticulated structure invisible. (ref. ID; 3597)

Comments

The new species differs from C. ampla (Jorgensen) in the more conical lorica, from C. laciniosa in incompletely separated lamellae, and from C. longa (Brandt) in being smaller and conical. This new species is considered to belong to the subgenus Protocochliella Jorgensen, because the wall shows a weak development of separation. (ref. ID; 3597)

Measurements

Length 60-65; oral diameter 45-50 um. (ref. ID; 3597)