Grainy frog snail

Grainy frog snail
	Granular bursa , Reunion
Systematics
Subordination :	Hypsogastropoda
Partial order :	Littorinimorpha
Superfamily :	Cassoidea
Family :	Frog snails (Bursidae)
Genre :	Bursa
Type :	Grainy frog snail
Scientific name
	Granular bursa
	( Röding , 1798)

Housing of the granular bursa

The Grainy Frog Snail ( Bursa granularis ) is a medium-sized predatory living snail from the family of the frog screws . Unlike most snails, it is common in the Indo-Pacific as well as the Atlantic and Caribbean .

features

The shell of the bursa granularis has a high thread, the whorls of which are sculptured with several alternating spiral rows of nodes and globules, with the largest nodes and globules on the periphery of the convolutions. Axially the shell has two rows of varices running over all circumferences on both sides. The wide, egg-shaped case mouth is serrated on the inside. Both the anterior siphon canal and the posterior anal canal are short. The outer surface of the shell is orange around the body and shaded darker on the thread with narrow whitish bands on the varices or creamy white with brown spots as the base color. The inside of the case mouth is white or faint orange. In adult snails the house reaches a length of 18 mm to 51 mm.

The male of Bursa granularis has an extremely long and narrow penis with rounded edges, but which is more than twice as wide as the closed vas deferens .

distribution and habitat

Bursa granularis is common in both the Indian and Pacific Oceans and in the western Atlantic Ocean from Texas to Brazil and the Caribbean . The snail is found mainly on coral reefs from the intertidal zone to depths of 256 m.

Life cycle

Like other frog snails, Bursa granularis is sexually separate. The male mates with the female with his penis . Veliger larvae hatch from the eggs and live as plankton until they have metamorphosed into the finished snail.

food

Bursa granularis feeds on echinoderms , including brittle stars , but also on snail eggs.

Web links

Commons : Grainy Frog Shell ( Bursa granularis ) - Collection of images, videos and audio files

Fischhaus Zepkow: Family Bursidae - frog snails
Underwater Kwajalein: Bursa granularis (Linnaeus, 1758)
Bursidae: Bursa granularis (Linnaeus, 1758). From: JM Poutiers: Gastropods . In: Kent E. Carpenter, Volker H. Niem (Eds.): FAO Species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Volume 1: Seaweeds, corals, bivalves and gastropods. Food and Agriculture Organization of the United Nations, Rome, 1998. p. 552.

Individual evidence

^ John Wesley Tunnell: Encyclopedia of Texas Seashells: Identification, Ecology, Distribution, and History. Texas A&M University Press, College Station (Texas) 2010. p. 180.
^ FB Brost, Robert D. Coale: A guide to shell collecting in the Kwajalein Atoll. Charles E. Tuttle Co., Rutland (Vermont) 1971. p. 126.
^ AG Beu (1998): Australian gastropods of the family Bursidae. Part 1. Sydney 2003, p. 269.
↑ Underwater Kwajalein: Family Bursidae - Bursa granularis (Röding, 1798) (...) eating the arm of a brittle star , August 10, 2010 / September 20, 2013; accessed on April 18, 2018.
^ AG Beu (1998): Australian gastropods of the family Bursidae. Part 1. Sydney 2003, p. 275.

[1] John Wesley Tunnell: Encyclopedia of Texas Seashells: Identification, Ecology, Distribution, and History. Texas A&M University Press, College Station (Texas) 2010. p. 180.

[2] FB Brost, Robert D. Coale: A guide to shell collecting in the Kwajalein Atoll. Charles E. Tuttle Co., Rutland (Vermont) 1971. p. 126.

[3] AG Beu (1998): Australian gastropods of the family Bursidae. Part 1. Sydney 2003, p. 269.

[4] Underwater Kwajalein: Family Bursidae - Bursa granularis (Röding, 1798) (...) eating the arm of a brittle star , August 10, 2010 / September 20, 2013; accessed on April 18, 2018.

[5] AG Beu (1998): Australian gastropods of the family Bursidae. Part 1. Sydney 2003, p. 275.