Syngenodrilus lamuensis

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Syngenodrilus lamuensis
Systematics
Subclass : Little bristle (Oligochaeta)
Superordinate : Metagynophora
Order : Alluroidida
Family : Syngenodrilidae
Genre : Syngenodrilus
Type : Syngenodrilus lamuensis
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

Individual evidence

  1. 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.