Segment

Definition and stakes

Portrait of Thomas Wallace Knox Thomas Wallace Knox,  The Story Teller of the Desert…

“ The fact that I have never studied the subject does not at all disqualify me from writing about it, if I were to follow the standard set up by some who have gone before me. Long essays have appeared from the pens of men who could hardly tell the difference between a pediment, and a cornice, or explain why a segment is not an angle or an angle a segment. ”
Source: Gutenberg

Portrait of John Mason Clarke John Mason Clarke,  The Eurypterida of New York (1912)

“ In summing up the larval characters observed in these immature eurypterids we consider as coenogenetic or purely larval the relatively larger size of the carapace, of the compound eyes and of the swimming legs, and the smaller number of the abdominal segments; as palingenetic and phylogenetic, the approximation of the compound eyes to the margin, the prominence of the ocelli and their tumescences, the lack of differentiation of the abdomen and the smaller size of the telson. ”
Source: Wikisource

Portrait of Charles Doolittle Walcott Charles Doolittle Walcott,  Cambrian Geology and Paleontology (1914)

“ The function of the proboscis and its terminal spines is unknown; it appears to be adapted to the gathering of food and conveying it to a mouth beneath the head, but it was probably used by the male to seize the female.
If we consider the appendage-bearing somites as the thorax, the abdomen is confined to the one elongated expanded somite I have referred to as the telson. This does not show evidence of segmentation unless there is a post-anal plate, which is very doubtful. None of the specimens of the male show any traces of caudal appendages.
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Source: Wikisource

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