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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Acanthostomella

Acanthostomella Jorgensen, 1927 (ref. ID; 3596, 3607) or Volkonsky (ref. ID; ?)

Order Heterotrichida Stein, 1867: Suborder Tintinnoinea Kofoid & Campbell, 1929: Family Petalotrichidae Kofoid & Campbell, 1929: Subfamily Craterellineae Kofoid & Campbell, 1929 (ref. ID; 3607)

[ref. ID; 3596]
Lorica small, stout goblet-shaped; inner and outer collars developed to form a shallow trough between them, former erect and entire, latter flaring outwards and denticulated with a number of minute triangular teeth; aboral end rounded, pointed, or having a short spine; wall hyaline, fine prismatic structure sometimes visible. (ref. ID; 3596)
  1. Acanthostomella conicoides (ref. ID; 3319)
  2. Acanthostomella gracilis (Brandt) (ref. ID; 3596, 3607) reported author and year? (ref. ID; 3319)
  3. Acanthostomella lata (ref. ID; 3319)
  4. Acanthostomella minutissima (ref. ID; 3319, 4464)
  5. Acanthostomella norvegica (Daday, 1887) (ref. ID; 1868) or (Daday) Jorgensen (ref. ID; 3596, 3606, 3607)
    Syn; Acanthostomella norvegica Jorgensen, 1927 (ref. ID; 3607); Acanthostomella norvegica Kofoid & Campbell, 1929 (ref. ID; 3606, 3607); Amphorella norvegica Daday, 1887 (ref. ID; 3606, 3607); Cyttarocylis norvegica Jorgensen, 1899 (ref. ID; 3607); Cyttarocylis norvegica var. minuta Jorgensen, 1901 (ref. ID; 3607); Tintinnus norvegicus Brandt, 1896 (ref. ID; 3607); Tintinnus norvegicus var. minutus Brandt, 1906 (ref. ID; 3607)
  6. Acanthostomella norvegica Kofoid & Campbell, 1929
    See; Acanthostomella norvegica (Daday) Jorgensen (ref. ID; 3606)
  7. Acanthostomella obtusa (ref. ID; 3319)

Acanthostomella norvegica (Daday, 1887) (ref. ID; 1868) or (Daday) Jorgensen (ref. ID; 3596, 3606, 3607)

Synonym

Acanthostomella norvegica Jorgensen, 1927 (ref. ID; 3607); Acanthostomella norvegica Kofoid & Campbell, 1929 (ref. ID; 3606, 3607); Amphorella norvegica Daday, 1887 (ref. ID; 3606, 3607); Cyttarocylis norvegica Jorgensen, 1899 (ref. ID; 3607); Cyttarocylis norvegica var. minuta Jorgensen, 1901 (ref. ID; 3607); Tintinnus norvegicus Brandt, 1896 (ref. ID; 3607); Tintinnus norvegicus var. minutus Brandt, 1906 (ref. ID; 3607)

Descriptions

Lorica cup-like, 1.5 oral diameter in length; inner collar a little higher than the outer spreading outwardly and having a diameter of 1.1-1.2 oral diameters; bowl slightly inflated in the post-median portion; aboral region rounded, but tapering into a short aboral spine. (ref. ID; 3596)
Lorica stout bell-shaped, 1.3-1.6 oral diameters in length, inner collar high; outer collar flaring, 1.17-1.23 oral diameters in transdiameter, denticulated with about 25 low triangular teeth; bowl conical (15-20 degrees) in the anterior half, widened gradually towards the middle part of the total length, its greatest transdiameter 1.13-1.24 oral diameters; aboral region hemispherical, provided with a short aboral spine tip sharply pointed. (ref. ID; 3607)

Comments

Specimens in this collection are smaller in size than those of the Atlantic (Brandt, 1907: length, 40-50 um) and Mutsu Bay (Hada, 1932: length, 43-47 um). The species differs from A. gracilis (Brandt) in a slight posterior inflation. (ref. ID; 3596)
Differs from Acanthostomella gracilis (Brandt) in having an aboral expansion and the acute aboral end. (ref. ID; 3607)

Measurements

Length 36-38; oral diameter 23-24 um. (ref. ID; 3596)
Length 40 (36-43); inner oral diameter 26 (25-27) um. (ref. ID; 3607)