Trachylinae
| Trachylinae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Trachylinae | ||||||||||||
| Haeckel , 1879 |
The subclass Trachylinae (in German rigid threads) contains cnidarians of the class of Hydrozoa (Hydrozoa). Trachylinae are relatively small medusas , live in the sea, especially in tropical and subtropical regions, and are an important part of the zooplankton . They are deep sea animals that mainly occur in greater and medium depths of the sea. Species of the Trachylinae were still found at depths of 6000 meters.
Trachylinae only have a medusa, no polyp stage . Some species have returned to the ground as secondary.
When they were first described in 1879, Haeckel distinguished them from the Leptolinae (today Hydroidolina ), among other things on the basis of their rigid and stiff tentacles and the fact that there is usually no generation change, and in them summarized the Trachymedusae and the Narcomedusae.
Later research confirmed the Trachylinae as a taxon, supplemented by the orders Limnomedusae and Actinulidae .
Systematics
The systematics given here follows the information in the Hydrozoa Directory .
- Subclass Trachylinae Haeckel, 1879
- Order Limnomedusae Kramp, 1938
- Armorhydridae family Swedmark & Teissier, 1958
- Microhydrulidae family Bouillon & Deroux, 1967
- Family Monobrachiidae Naumov, 1960
- Family Olindiidae Haeckel, 1879
- Order Trachymedusae Haeckel, 1866
- Family Geryoniidae Péron & Lesueur, 1810
- Family Halicreatidae Fewkes, 1886
- Family Petasidae Haeckel, 1879
- Family Ptychogastriidae Mayer, 1910
- Family Rhopalonematidae Russell, 1953
- Order Narcomedusae Haeckel, 1879
- Family Aeginidae Gegenbaur, 1857
- Family Cuninidae Bigelow, 1913
- Family Solmarisidae Haeckel, 1879
- Family Tetraplatiidae Schuchert, 2007
- Order Actinulidae Swedmark & Teissier, 1958
- Family Halammohydridae Remane, 1927
- Family Otohydridae Swedmark & Teissier, 1958
- Order Limnomedusae Kramp, 1938
swell
literature
- Gruner, H.-E., Hannemann, H.-J., Hartwich, G., Kilias, R .: Urania Tierreich, Invertebrates 1 (Protozoa to Echiurida) . Urania-Verlag, ISBN 3-332-00501-4
Individual evidence
- ↑ Ernst Haeckel: The System of Medusen , 1879, p. 233
- ^ A b Peter Schuchert, The Hydrozoa Directory , accessed September 25, 2009