2020
DOI: 10.1111/pala.12519
|View full text |Cite
|
Sign up to set email alerts
|

Abstract: Scaphitids rank among the commonest and best‐known Late Cretaceous ammonites, yet many aspects of their palaeobiology are still unresolved. Here, natural moulds and co‐occurring aptychi (calcitic coverings of the lower jaw) of Hoploscaphites constrictus crassus from the upper Maastrichtian of Poland are studied. For the first time in a scaphitid ammonite, growth marks are identified on the moulds and aptychi, which enable a reconstruction of the successive ontogenetic stages of the shell and aptychus.  These a… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1

Citation Types

0
3
0

Year Published

2021
2021
2024
2024

Publication Types

Select...
3

Relationship

1
2

Authors

Journals

citations
Cited by 3 publications
(3 citation statements)
references
References 64 publications
(155 reference statements)
0
3
0
Order By: Relevance
“…(b) A pair of aptychi in internal mould preservation (with discernible growth increments present on the dorsal surfaces of the original aptychi) inside a mould of H. c. lvivensis, ZPAL Am. 12/796 (see Machalski, 2021 22 for interpretation of this specimen and for terminology of aptychi). (c) Single aptychus, ZPAL Am.…”
Section: Geological Settingmentioning
confidence: 99%
See 1 more Smart Citation
“…(b) A pair of aptychi in internal mould preservation (with discernible growth increments present on the dorsal surfaces of the original aptychi) inside a mould of H. c. lvivensis, ZPAL Am. 12/796 (see Machalski, 2021 22 for interpretation of this specimen and for terminology of aptychi). (c) Single aptychus, ZPAL Am.…”
Section: Geological Settingmentioning
confidence: 99%
“…We target Hoploscaphites constrictus (Fig. 1), a species common in the Maastrichtian of Europe 21,22 . More specifically, we study two successive members (which we interpret as two temporal subspecies, or chronosubspecies) of the Hoploscaphites constrictus evolutionary lineage 21 , based on specimens and samples from three intervals in the shallowing-upwards epicontinental chalk succession of late Maastrichtian age exposed at Chełm, Poland 23,24 .…”
mentioning
confidence: 99%
“…The major growth increments were hypothesised to represent fortnightly tidal cycles or months, and the minor increments to correspond to days or semi-diurnal tidal cycles. If this assumption is correct, the ammonite life span would last between 1 and 6 years and the growth would be sigmoidal, with slowing down at maturity (Hewitt et al, 1993;Machalski, 2021).…”
Section: Microstructure: Age Growth and Record Of Life Extreme Eventsmentioning
confidence: 99%