Home of the Fossil Coralline Algae
STEYREGG - MOLASSE ZONE

(Preleminary Results)

Created by Michael Rasser

Samples by Dieter Kaiser, stored at the University of Bremen (Germany)

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"Lithothamnion" sp. 1

Growth form fruticose.
Conceptacles: multiporate, 110-120 x 300-330 Ám, roof thickness 27-45 Ám.
Core filaments: not known!
Peripheral filaments: growth rhythms with 170-240 Ám; cell size: 7-10 x 18-34 Ám.

Occurrence: Main "Maerl"-former of the study area. Most dominant in all samples; for example: 48 (image), 46, 116 (image1, image 2)

Remarks: As core filaments and epithallial cells are not preserved, the more appropriate name would be: Melobesioideae indet.


Lithothamnion operculatum
(= Phymatolithon calcareum sensu Basso et al., 1997, Facies 37)

Growth form encrusting to foliose.
Conceptacles: multiporate, 100-170 x 250-450 Ám, roof thickness 45-70 Ám, roof rimmed, cells in the roof: 4-7 x 5-7 Ám.
Core filaments: non-coaxial, 60-120 Ám thick, cells 5-7 x 9-16 Ám.
Peripheral filaments: 5-9 x 7-12 Ám.

Occurrence: Not abundant. Mainly forms crusts, no branches. Is the only rhodolith - former of the study area. Samples: 58 (image 1, image 2), 62 (image 1, image 2), 65 (image), 74 (rhodolith-forming), 76 (rhodolith forming).

Remarks: easy to recognize owing to the encrusting growth form and conceptacles shape.


Mesophyllum sp.

Growth form: encrusting to foliose.
Conceptacles: multiporate, 130-150 x 340-410 Ám, roof thickness 50 Ám.
Core filaments: coaxial, 100 - 200 Ám thick, cells 7-9 x 14-20 Ám.
Peripheral filaments: cells 5-7 x 9-11 Ám.

Occurrence: only one sample: 55.


Spongites sp.

Growth form: encrusting.
Thallus dimerous.
Conceptacles: 120-130 x 350-360 Ám, monoporate; collumella occurs; filaments around conceptacle pore subparallel to roof surface.
Primigenous filaments: poorly preserved, cells 11-13 x 11-16 Ám.
Peripheral filaments: 11-13 x 13-18 Ám.

Occurrence: only two samples: 65 (image), 76.


Lithoporella melobesioides

Occurrence: rare; sample: 22.

Image available from the Krappfeld-area.


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