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Intraspecific Variability and Problematic Dimorphism in the Early Cretaceous (Valanginian) Ammonite Saynoceras verrucosum (d'Orbigny, 1841)
Author(s) -
PLOCH Izabela
Publication year - 2007
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2007.tb01009.x
Subject(s) - ammonite , intraspecific competition , structural basin , sexual dimorphism , cretaceous , population , geography , biology , geology , paleontology , zoology , demography , sociology
The population of Saynoceras verrucosum (d'Orbigny) from the Polish basin (Wa̧awal section, central Poland) shows no significant intraspecific variability. Dimorphism has not been found in this population. Statistical analyses of material from the shallow epicratonic Polish basin and the relatively deep Vocontian basin (southeastern France) indicated two populations. Forms from the Polish basin are somewhat more inflated and smaller than forms from the Vocontian basin.