Streblospio benedicti
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Streblospio benedicti |
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| Scientific name | ||||||||||||
| Streblospio benedicti | ||||||||||||
| Webster , 1879 |
Streblospio benedicti is a marine annelid from the family of Spionidae within the class of polychaete (Polychaeta) in seas on the northern hemisphere is widespread.
features
Streblospio benedicti has a white to reddish body up to 1 cm long with around 50 segments . The truncated cone-shaped prostomium has 1 to 2 pairs of eyes, but no antennae. 2 long palps are available. The first segment has a lip on the abdomen and two cylindrical gills on the back that resemble palps. The second bristle-bearing segment has a collar between the notopodia . From the 7th or 9th bristle-bearing segment, there are capillary-like bristles on the neuropodia , 4 to 10 hood-bearing hooks, on which 4 teeth are located distally and another, larger tooth and a spike are located subdistally. The bristles on the notopodia are capillary-like. The pygidium is weakly bilobed.
distribution and habitat
Streblospio benedicti is common in the northern Pacific Ocean , the northern Atlantic Ocean to the Mediterranean , the Black Sea , the North Sea and the Baltic Sea . The polychaete lives on soft, muddy substrates and in estuaries with brackish water frequently.
Streblospio benedicti uses its two palps to collect food particles from mud and detritus from the substrate surface and transport them to the mouth.
Development cycle
Streblospio benedicti is separate sexes, and the mother hatches the fertilized eggs in brood pouches on the back. In some populations the larvae, after they have left the mother at about 0.3 mm in size, live for about 7 weeks as free-swimming zooplankton of phytoplankton, while in other populations the eggs are more yolk-rich, the larvae longer, up to a size of about 0.6 mm remain with the mother and only live for a few hours to days as free-swimming, non-eating larvae before they sink down and metamorphose into a creeping worm .
literature
- Verônica da Fonsêca-Genevois, Claude Cazaux (1987): Streblospio benedicti Webster, 1879 (Annélide Polychète) dans l'estuaire de la Loire: biologie et écologie. Cahiers de Biologie Marine 28, pp. 231-261.
Web links
- MJ de Kluijver et al .: Streblospio benedicti Webster, 1879. Macrobenthos of the North Sea - Polychaeta, Marine Species Identification Portal
- J. Masterson: Streblospio benedicti. General spirorbid morphology and ecology, Smithsonian Marine Station at Fort Pierce, 2008.