Neritina pulligera

Housing of Neritina pulli rated

Neritina pulli screened at the German Steel Helmet Snail, Brown Rennschnecke or Black ball racing snail, is a living in fresh and brackish water snail from the family of Kahn snails ( Neritidae ), which belongs to the order of Neritomorpha. It is distributed along the coasts of the Indo-Pacific.

Features

The elliptically shaped, moderately curved case of Neritina pulli screened achieved in adult worm has a diameter from 21 to 40 mm. The thread is very small, sunken and surrounded by the wall -like raised edge of the seam of the body handling. The transversely oval case mouth is up to 31 mm high and is not provided with a bar. The outer edge is evenly curved, the upper edge along the Columellarfläche, of which it is separated by a gutter runs, slightly S-shaped and end up going into a to - and backward curved ears that completes the wall -like girding of the thread. The Columellarrand has a slight indentation, which is provided with about 15 fine blunt tooth in the middle. The Columellarfläche is a bit rough, swollen just forward and backward, delimited below by a sharp edge of the outside of the shell, in the upper two -fifths only by color and luster.

The surface of the housing has only a vague drawing, often fine black lines parallel to Mündungssaum or lighter drop with forward-facing black lace, which is hidden by the dark green-brown or blackish shell skin. The inside of the case mouth and the outer edge are gray white with an orange band behind the outer edge to the ears and the lower end of Columellarrandes whose surface is blackish.

The operculum is outside and inside glossy green, reddish towards the convex edge and out with equal broad brownish black beams and significant fine radial lines. The edge is black and has a bright red trim. The inner rim has a slight advantage. The inside flesh is reddish light yellowish gray with a broad beam and the hem out. The blunt pin rises to wrong and has a broader basis. The rib is a string shape, has very weak transverse and longitudinal lines, and ends blunt.

The screen plates of the radula have a fine serrations with about 30 teeth, the first tooth edge 15 with the thickened part of the center plate ends at the rear in a concave boundary.

Geographical distribution and habitat

Neritina sweatshirt is screened in the rivers of the coasts of the Indopazifiks used: in South Africa, Kenya, Madagascar, Seychelles, Andaman, Nicobar, Indonesia, New Guinea, Palau, Guam, the Caroline Islands, Solomon Islands, Taiwan and Okinawa.

The snails live on rocks and foliage in fast flowing rivers near the coast.

Way of life

Neritina pulli screened like all snails Kahn dioecious. The male mated the female with his penis. The female egg capsules attached to stones and roots, which hatch freely floating veliger larvae. These are drifted into the sea water, where they feed on zooplankton as plankton. In fresh water, the larvae can survive only a short time. Search Just before metamorphosis, the veliger larvae back to brackish water areas. After metamorphosis, the finished worm migrate up the rivers. The development of the screw is therefore tied to the coastal area.

The worm feeds on detritus and algae from the water plants and rocks. They also eat brush algae.

Use

Neritina pulli screened is popular in the aquarium hobby and is similar to a number of other snails Kahn used to indemnify the aquariums and aquatic plants from algae. In aquariums, enclosures reach a diameter of 2.5 to 3 cm. The lowest temperature of the aquarium is 18 to 30 ° C. As with other Kahn snails and even the most snails with free-swimming veliger larvae breeding has not been successful, given the proper diet of living in salt water larvae fails. All Kahn snails in aquariums are so wild catches.