IGNOU BGYCT 137 2026 - Discuss the morphology and geological history of ammonoids.

Question

Discuss the morphology and geological history of ammonoids.

19 Jan 2026

Answer :

Word Count : 478

Ammonoids are an extinct group of marine mollusks belonging to the class Cephalopoda and subclass Ammonoidea, closely related to modern squids, octopuses, and cuttlefish. Morphologically, ammonoids are characterized by their coiled, planispiral shells, although some forms exhibited loosely coiled or even uncoiled shells. The shell is typically divided internally into chambers called camerae, separated by thin walls known as septa. The septa are intricately folded, forming complex suture patterns where the septa meet the outer shell wall, which is one of the defining features used in their classification. Suture patterns evolved from simple curved lines in early forms to highly

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