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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 intricate lobes and saddles in later ammonoids, and these patterns are critical in biostratigraphy for dating rock strata. The _______ __________ _______ ________ _________ ___ __________ _____ _____.
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