Cephalopod embryonic shells as a tool to reconstruct reproductive strategies in extinct taxa

@article{Laptikhovsky2018CephalopodES,
  title={Cephalopod embryonic shells as a tool to reconstruct reproductive strategies in extinct taxa},
  author={Vladimir L. Laptikhovsky and Svetlana V. Nikolaeva and Mikhail A. Rogov},
  journal={Biological Reviews},
  year={2018},
  volume={93}
}
An exhaustive study of existing data on the relationship between egg size and maximum size of embryonic shells in 42 species of extant cephalopods demonstrated that these values are approximately equal regardless of taxonomy and shell morphology. Egg size is also approximately equal to mantle length of hatchlings in 45 cephalopod species with rudimentary shells. Paired data on the size of the initial chamber versus embryonic shell in 235 species of Ammonoidea, 46 Bactritida, 13 Nautilida, 22… 

A phylogenetic approach to understand the evolution of reproduction in coleoid cephalopods.

Macroevolutionary Trade-Offs and Trends in Life History Traits of Cephalopods Through a Comparative Phylogenetic Approach

The robust inverse relationship between fecundity and egg length indicates that cephalopods evolved a directional selection that favored an increase of fecundities and a reduction of egg length in larger species, or an increase in egg length with the concomitant reduction of fecondity and body length in order to benefit offspring survival.

Evolution of reproductive strategies in coleoid mollusks

This study subdivides the early ontogenetic shells of phragmocone-bearing coleoids (belemnoids, spirulids, and sepiids) into key architectural stages and describes their reference to the hatching event, finding that production of small pelagic hatchlings and thus small eggs was the dominant reproductive strategy within the Coleoidea.

Spatial distribution of oncocerid cephalopods on a Middle Devonian bedding plane suggests semelparous life cycle

A mass-occurrence with common preservation of pairs of late Givetian (Middle Devonian) oncocerid cephalopods from Hamar Laghdad in the Tafilalt (eastern Anti-Atlas, Morocco) shows that the pairwise clustering is significant, while ammonoids on the same bedding plane reveal a more random distribution.

Early ontogenetic growth stages of Middle Ordovician orthoceratoid cephalopods from Bohemia

The studied collection includes twelve specimens assigned to the species Bactroceras sandbergeri and shows that the morphological variability in early ontogenetic growth stages of this species was rather low, supporting the previously postulated trend of decreasing the eggand hatchling sizes in orthoceratoid cephalopods from mid-Ordovician times onwards.

Endocerids: suspension feeding nautiloids?

  • A. Mironenko
  • Environmental Science, Geography
    Historical Biology
  • 2018
A new hypothesis is proposed and debated: according to it, the endocerids were planktotrophic cephalopods and the largest of them were giant suspension feeders.

Recent advances in heteromorph ammonoid palaeobiology

An improved understanding of heteromorph ammonoid palaeobiology is reached, linking their small hatchling sizes, planktotrophic diets, and higher metabolic rates than in nautilids, which survived the K/Pg mass extinction event.

The old and the new plankton: ecological replacement of associations of mollusc plankton and giant filter feeders after the Cretaceous?

It is suggested that similar niches occupied in the Cretaceous by juvenile ammonites and belemnites were vacated during the extinction and later partially filled by holoplanktonic gastropods.

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