Syngenodrilus lamuensis
Syngenodrilus lamuensis | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Systematics | ||||||||||||
|
||||||||||||
Scientific name of the family | ||||||||||||
Syngenodrilidae | ||||||||||||
Smith & Green , 1919 | ||||||||||||
Scientific name of the genus | ||||||||||||
Syngenodrilus | ||||||||||||
Smith & Green , 1919 | ||||||||||||
Scientific name of the species | ||||||||||||
Syngenodrilus lamuensis | ||||||||||||
Smith & Green , 1919 |
Syngenodrilus lamuensis is the name of a species ofground-dwelling, earthworm-like little bristle(Oligochaeta) in the ringworm class of belt worms (Clitellata)that is widespreadin Africa . It is also the only species of the genus Syngenodrilus and the family Syngenodrilidae , which forms the order of the Alluroidida with the family Alluroididae .
features
The body of Syngenodrilus lamuensis becomes about 5 cm long and 4 mm wide with a number of around 137 segments. There are four pairs of very small bristles on each segment .
The esophagus forms two gizzards located in the 11th and 12th segments. Calcium glands are also missing. The closed blood vessel system has 6 pairs of lateral hearts between the 6th and 11th segment . The large, paired nephridia are well developed, but are absent in the 1st to 3rd and 11th to 12th segments.
The existing only from a cell layer clitellum of the hermaphrodite is ring-shaped with longitudinally extending tuberosities pubertatis , ranging from the 11th to the 16th segment. The annelid worm has 2 pairs of testicles , suspended in scrotums in the 10th and 11th segment (rarely one segment behind), and a pair of ovaries in the 13th segment. The only pair of male genital orifices is located laterally in the 13th segment, i.e. in front of the only pair of female genital orifices that are in the 14th segment, so just like the male inside the clitellum. The sperm vesicles extend backwards over several segments within the ice sacs. Genital and penis bristles can be present or absent. The prostates open independently of the male outputs in the 11th, 12th and 13th segment to the outside. The simple, long and slender, paired receptacula seminis are located in the 8th and 9th segment and open outwards at the transition to the segment in front of it.
Distribution, habitat and way of life
Syngenodrilus lamuensis is common in Africa . It became known through a find in Kenya near Mkonumbi near Lamu , although the original site no longer exists as such and only earthworms of the Eudrilidae family are found in the soils of neighboring areas . Further specimens of Syngenodrilus lamuensis were found in the Upemba National Park in the Democratic Republic of the Congo . Like earthworms, it lives in the ground as a substrate eater , digesting the organic components of the ingested substrate.
literature
- Frank Smith, Bessie R. Green (1919): Descriptions of new African earthworms: including a new genus of Moniligastridae. Proceedings of the United States National Museum. 55 (2263), pp. 145-166.
- András Zicsi, Csaba Csuzdi (2000): Other new and little known earthworm species from the Upemba National Park, Republic of the Congo (Oligochaeta). Reports of the Natural Science and Medical Association in Innsbruck 87, pp. 119–131.
- Barrie GM Jamieson, Marco Ferraguti: Non-leech Clitellata. In: Greg Rouse, Fredrik Pleijel (Eds.): Reproductive Biology and Phylogeny of Annelida. Science Publishers, Enfield (NH) 2006. Chapter 8, pp. 235-392. Syngenodrilus lamuensis p. 255, Suborder Alluroidina, Superfamily Alluroidoidea, Syngenodrilidae p. 309.
Individual evidence
- ↑ Samuel W. James, Seana K. Davidson (2012): Molecular phylogeny of earthworms (Annelida: Crassiclitellata) based on 28S, 18S and 16S gene sequences. Invertebrate Systematics 26, pp. 213-229.