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| Family: | Ammagnostidae
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Ammagnostidae is a family of trilobites in the suborder Agnostina, small, eyeless, isopygous trilobites with a thorax consisting of 2 segments only. Four genera have been assigned to it:
- Ammagnostus Öpik, 1967
- Ammagnostus psammius Öpik, 1967 (Type)
- Ammagnostus bassus (Öpik, 1967)
- Ammagnostus bella Guo & Luo, 1996
- Ammagnostus beltensis (Lochman, 1944)
- Ammagnostus cryptus
- Ammagnostus cylindratus Guo & Luo, 1996
- Ammagnostus duibianensis Lu & Lin, 1989
- Ammagnostus histus
- Ammagnostus hunanensis
- Ammagnostus integriceps Öpik, 1967
- Ammagnostus laiwuensis (Lorenz, 1906)
- Ammagnostus mitis Öpik, 1967
- Ammagnostus sinensis Peng, 1987
- Ammagnostus wangcunensis Peng & Robison
- Hadragnostus Öpik, 1967
- Hadragnostus las Öpik, 1967 (Type)
- Hadragnostus edax Fortey & Rushton, 1976
- Hadragnostus helixensis Jago & Cooper, 2005
- Hadragnostus modestus (Lochman, 1944)
- Kormagnostus Resser, 1938
- Kormagnostus simplex Resser, 1938 (Type)
- Kormagnostus boltoni Westrop et al., 1996
- Kormagnostus copelandi Westrop et al., 1996
- Kormagnostus flati Pratt, 1992
- Kormagnostus inventus Shergold, 1982
- Kormagnostus minutus (Schrank, 1975)
- Kormagnostus seclusus (Walcott, 1884)
- Proagnostus Butts, 1926
- Proagnostus bulbus Butts, 1926 (Type)
- Proagnostus centerensis Resser, 1938
- Proagnostus maryvillensis Resser
They lived during the late Cambrian period to the Ordovician period.
References
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Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction