Kalpana Kalpana (Editor)

Sigmoilina

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Phylum
  
Granuloreticulosa

Superfamily
  
Rank
  
Genus

Order
  
Family
  
Class
  
ForaminiferaTubothalamea

Similar
  
Triloculina, Quinqueloculina, Miliolida, Gyroidina, Eponides

Sigmoilina top 5 facts


Sigmoilina ia a miliolid genus, referring to the foraminiferal order Miliolida, characterized by an assymmetricall biconvex test formed by strongly overlapping chambers, one-half coil in length, that form a sigmoid (S-shaped) curve in cross section. The strongly overlapping chambers obliterate earlier ones from view resulting in the compressed biloculine appearance, differing from the squat, depressed biloculine form of Pyrgo and Biloculina. The test, as for all Miliolida, is porcelaneous and imperphorate, the terminal aperture, with tooth, the only point of egress and ingress for the animal.

Sigmoilina is a protist, or proctoctist according to B.K. Sen Gupta, 1999, included in the miliolid family Hauerinidae (Loeblich & Tappan, 1988). It was previously assigned to the Miliolidae (Loeblich & Tappan, 1964) when foraminfera were regarded as comprising a suborder (Foraminiferida).

References

Sigmoilina Wikipedia