Leptomedusae

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Leptomedusae
Aglaphenoia sp. in the Adriatic

Aglaphenoia sp. in the Adriatic

Systematics
without rank: Multicellular animals (Metazoa)
without rank: Tissue animals (Eumetazoa)
Trunk : Cnidarians (Cnidaria)
Class : Hydrozoa (Hydrozoa)
Subclass : Leptolinae
Order : Leptomedusae
Scientific name
Leptomedusae
Haeckel , 1866

The Leptomedusae ( synonyms : Thecata, Thecaphora, Leptothecata) are cnidarians from the class of hydrozoans . All Leptomedusae live in the sea, also on the European coasts. Around 1900 species are counted among them.

features

The polyp stage of animals always lives colonial . A characteristic of the group is that the peridermal envelope not only encompasses the polyp trunk, but also the polyp head (hydrant) and surrounds it with a funnel-shaped hydrotheca. However, this can be so short that the polyp cannot withdraw into it.

The medusa stage of the Leptomedusae has flat screens and often has organs of equilibrium at the velum. The gonads are located on the radial canals.

The Leptomedusae usually have more than four tentacles and never stenotele nettle cells.

Aequorea victoria
Indeterminate nettle fern in the Gulf of California

Systematics

The systematics given here follows the information in the Hydrozoa Directory .

Individual evidence

  1. ↑ Peter Schuchert, The Hydrozoa Directory , accessed September 25, 2009

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

Web links

Commons : Leptothecata  - collection of images, videos and audio files