Carterina
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| Scientific name | ||||||||||||
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| Brady , 1884 |
Carterina is the only genus of an order of shell-bearing protists from the group of foraminifera . It has been fossilized since the Upper Eocene .
features
The first, still simple chambers of the trochospiral housing, which consists of low magnesium calcite , are semicircular, later after about two turns of the spiral, crescent-shaped to irregular in shape and further subdivided by partition walls (septa).
The special feature of the Carterina is the construction of its housing. It is made up of numerous rod-shaped crystal needles that are secreted by the animal and applied in layers to an organic outer skin that serves as the base of the housing. Between these larger needles, smaller, but otherwise identical needles are attached together with an organic substance as putty . The needles are presumably produced in the protoplasm and then attached to the outer skin. They reach sizes between 1 and 22 micrometers , those on the surface increase in length from the inside out.
Distribution and way of life
Carterina are found in tropical coastal waters around the world. Presumably, they initially live freely and only sessile on the ground as adults.
Systematics
The genus was first described in 1884 by Henry Bowman Brady . The family was first described in 1955 and the order in 1981 by Alfred R. Loeblich and Helen Tappan . Types are:
- Carterina spiculotesta (type species)
proof
- Alfred R. Loeblich, Jr., Helen Tappan: Foraminiferal genera and their classification , E-Book des Geological Survey Of Iran , 2005, online on subordination or genus
Individual evidence
- ↑ Klaus Nuglisch: Foraminiferen - marine Mikroorganismen , Wittenberg, 1985