Protodriloides
| Protodriloides | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the family | ||||||||||||
| Protodriloididae | ||||||||||||
| Purschke & Jouin , 1988 | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Protodriloides | ||||||||||||
| Jouin , 1966 |
In the genus Protodriloides that the same mono generic family Protodriloididae forms, it is a 2-known types counting group minute to less than, in the sand gap system of live and nourishing of bacteria and other microorganisms polychaete (Polychaeta), which are found in seas worldwide .
features
The Protodriloididae have a slender and flat body that grows up to 13 mm in length and can count 50 segments . The prostomium bears two strong palps (“tentacles”) in front , which, unlike the Protodrilidae and Saccocirridae, are not “implanted” in the prostomium, but rather are its direct extensions. Two nuchal organs sit on the prostomium , but eyes are missing, as are the " statocysts " typical of the Protodrilidae . The anterior pharynx has no tongue. A row of eyelashes runs ventrally on the segmented trunk, and two sticky lobes sit on the pygidium. Parapodia are absent, but bristles in the form of distally serrated hooks may be present.
distribution and habitat
The Protodriloididae live similar to the Protodrilidae in the sand gap system of sedimentary soils in seas around the world, where they move with the help of their abdominal row of eyelashes and attach themselves to the grains of sand with the help of their segmented adhesive glands or their bristles.
Development cycle
The Protodriloididae are sexually separated. The females secrete cocoons in which they lay a small number of large, yolk-rich eggs. The eggs are probably fertilized by the spherical, flagellated sperm in the course of a dummy mating in the cocoon. The zygotes develop into crawling worms in the cocoon over a period of up to 25 days, which are already largely similar to adults.
Systematics
The only two known species in the family are Protodriloides symbioticus and Protodriloides chaetifer . They were placed in the genus Protodrilus until, in 1966 , Claude Jouin recognized fundamental differences in the construction of the tentacles and in reproductive biology, which is why they established the new genus Protodriloides . On the basis of a phylogenetic study, she and Günter Purschke established their own monogeneric family Protodriloidae in 1988, for which the new name Protodriloididae was chosen in 1997 by Kristian Fauchald and Gregory Rouse .
species
The following species belong to the Protodriloididae family and its only genus, Protodriloides :
- Protodriloides symbioticus (Giard, 1904)
- Protodriloides chaetifer (Remane, 1926)
literature
- Claude Jouin (1966): Morphologie et anatomie comparée de Protodrilus chaetifer Remane et Protodrilus symbioticus Giard; creation du nouveau genre Protodriloides (Archiannélides). Cahiers de Biologie Marine 7, pp. 139-155.
- Günter Purschke, Claude Jouin (1988): Anatomy and ultrastructure of the ventral pharyngeal organs of Saccocirrus (Saccocirridae) and Protodriloides (Protodriloidae fam. N.) With remarks on the phylogenetic relationships within Protodrilida (Annelida: Polychaeta). Journal of Zoology London 215 (3), pp. 405-432.
- Gregory W. Rouse, Kristian Fauchald (1998): Recent views on the status, delineation, and classification of the Annelida. (PDF). American Zoologist. 38 (6), pp. 953-964. doi: 10.1093 / icb / 38.6.953
- Stanley J. Edmonds: Fauna of Australia, Volume 4A. Polychaetes & Allies. The Southern Synthesis 4. Commonwealth of Australia, 2000. Class Polychaeta. Pp. 318f., Family Protodriloididae.
Individual evidence
- ↑ Protodriloides Jouin, 1966. WoRMS , 2018. Accessed December 10, 2018th