Aulacoseira italica

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SPECIES Aulacoseira italica
(Ehrenberg)Simonsen emend. Crawford, Likhoshway & Jahn (2003)

Taxonomic Information

Jr. Synonymy:

  • Gaillonella italica Ehrenberg 1838 (basionym)
  • Melosira italica (Ehrenberg) Kutzing 1844
  • Gaillonella crenulata Ehrenberg 1843
  • Melosira crenulata (Ehrenberg) Kutzing 1844
  • Aulacoseira crenulata (Ehrenberg) Twaites 1848
  • Aulacoseira italica f. crenulata (Ehrenberg) Ross 1986
Morphometry:
     Diameter: 3-30 μm
     Height:
     Pore Rows: 18-25 in 10 μm
     Pores: angust-elliptic, slit-shaped, or subcircular, 10-20 in 10 μm
Species Description:

Crawford, Likhoshway, & Jahn (2003)

Valves united by broadly anvil- or spade-shaped linking spines that vary in length among sibling valve pairs. A single row (rarely two) of areolae run up the stem of the spine which may bear a number of granules. Separation spines of the same length as linking spines but tapering to a fine point are formed rarely. Areolae are subcircular, or more usually angust-elliptic to fine slits and arranged in sinistrorse, spiraling rows. Velum a spongiform plate covering the inner aperature of the areolae and suspended by 3 or 4 supports from the sides of the areola. Valve face more or less covered by randomly arranged areolae or areolae absent. Rimoportulae one or more, usually two, per valve, visible with difficulty in LM and positioned 4-5 areolae distant from the ringleist. Outer aperature of rimoportula not distinguishable in SEM from areolae; inside aperature terminates in a straight tube lying flat against the valve surface and oriented transverse to the areolar rows. Ringleist solid, narrow and shallow. This species forms resting spores.


  • Ecologic Information: The ecology of A. italica is not well known, but probably is not planktonic, given the species it is typically found with.

Useful References

  • Crawford, R.M, Likhoshway, Y.V., & Jahn R., 2003, Morphology and identity of Aulacoseira italica and typification of Aulacoseira (Bacillariophyta), Diatom Research 18(1):1-19.
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