Techniques for Estimating the Age and Growth of Molluscs: Cephalopoda

Arkhipkin, Alexander I.; Бизиков, В. А.; Doubleday, Zoë A.; Laptikhovsky, Vladimir; Lishchenko, Fedor; Perales-Raya, C.; Hollyman, Philip R.

doi:10.2983/035.037.0409

Cited by 43 publications

(32 citation statements)

References 61 publications

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“…This interpretation is based on a comparison with beaks of Recent coleoids (summary in Arkhipkin et al . 2018) and is compatible with conclusions reached by Hewitt et al . (1993) for aptychi.…”

Section: Assessment Of the Materialssupporting

confidence: 93%

Correlation of shell and aptychus growth provides insights into the palaeobiology of a scaphitid ammonite

Machalski

2020

Palaeontology

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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 are correlated to each other, allowing us to address two open issues in scaphitid palaeobiology: (1) estimation of individual growth rate and age; and (2) assessment of the aptychus as a possible protective operculum. As far as the growth rate of H. c. crassus is concerned, this accelerated rapidly at the onset of the mature body chamber formation and decelerated shortly before the cessation of growth. The resultant growth curve departs significantly from the generalized growth curve previously proposed for ammonites. In contrast, an age of five years at maturity, tentatively estimated here for H. c. crassus, conforms to the previous estimates for shallow‐water ammonites of comparable size. The role of the aptychus as an operculum is rejected for H. c. crassus, based on a significant misfit in size and shape between the aperture and aptychus recorded during ontogeny. These conclusions may probably be extended to closely related members of the European Hoploscaphites constrictus evolutionary lineage and to some other scaphitids with shells similar in size and shape to that of H. c. crassus.

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Section: Assessment Of the Materialssupporting

confidence: 93%

Correlation of shell and aptychus growth provides insights into the palaeobiology of a scaphitid ammonite

Machalski

2020

Palaeontology

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“…As maintenance of blood pH in vertebrates is mostly controlled by plasma bicarbonate (Tresguerres and Hamilton, 2017), plasma of octopus may be buffered by proteins such as Hc, which constitutes 98% of all proteins in plasma of these species (Aguila et al, 2007). This low bicarbonate levels in cephalopods may be of interest to further investigate the formation of their hard structures and thus evaluate growth rates (Arkhipkin et al, 2018), and/or to describe their acid-base mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Acute-Stress Biomarkers in Three Octopodidae Species After Bottom Trawling

et al. 2019

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Several Octopodidae species have a great potential for the diversification of worldwide aquaculture. Unfortunately, the lack of stress-related biomarkers in this taxon results an obstacle for its maintenance in conditions where animal welfare is of paramount relevance. In this study, we made a first approach to uncover physiological responses related to fishing capture in Eledone moschata , Eledone cirrhosa , and Octopus vulgaris . Captured octopus from all three species were individually maintained in an aquaculture system onboard of oceanographic vessel in south-western waters of Europe. Haemolymph plasma and muscle were collected in animals at the moment of capture, and recovery was evaluated along a time-course of 48 h in Eledone spp., and 24 h for O. vulgaris . Survival rates of these species captured in spring and autumn were evaluated. Physiological parameters such as plasma pH, total CO 2 , peroxidase activity, lysozyme, hemocyanin, proteases, pro-phenoloxidase, anti-proteases, free amino acids, lactate and glucose levels, as well as muscle water percentage, free amino acids, lactate, glycogen and glucose values were analyzed. The immune system appears to be compromised in these species due to capture processes, while energy metabolites were mobilized to face the acute-stress situation, but recovery of all described parameters occurs within the first 24 h after capture. Moreover, this situation exerts hydric balance changes, as observed in the muscle water, being these responses depending on the species assessed. In conclusion, three Octopodidae species from south-western waters of Europe have been evaluated for stress-related biomarkers resulting in differentiated mechanisms between species. This study may pave the way to further study the physiology of stress in adult octopuses and develop new methodologies for their growth in aquaculture conditions.

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“…Also, the nonmineralized shell remains of squids, the gladii, show no distinct evidence of hatching markers. Among other hard structures, hatching marks are found on statoliths of Decabrachia and on stylets (vestigial shells) of Octobrachia, but they do not provide any evidence of the hatchling size (Arkhipkin et al 2018).…”

Section: Known and Unknown Hatching Markers In Cephalopod Shellsmentioning

confidence: 99%

Evolution of reproductive strategies in coleoid mollusks

Fuchs¹,

Laptikhovsky²,

Nikolaeva

et al. 2020

Paleobiology

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Coleoid cephalopods exhibited two distinct reproductive strategies, resulting in small pelagic and large demersal hatchlings, both in the geologic past and recently. In ectocochleate cephalopods, the hatching event is recorded in shell structures (e.g., nepionic constrictions, ultrastructural shifts, or ornamentation differences). In contrast, well-defined hatching markers do not exist on coleoid shells. Changes in septal spacing may be evidence of hatching (e.g., some extant sepiids), but not in all fossil groups. In the present study, we subdivide the early ontogenetic shells of phragmocone-bearing coleoids (belemnoids, spirulids, and sepiids) into key architectural stages and describe their reference to the hatching event. Belemnoids exhibit three key stages, the second of which is here considered to occur shortly before or after hatching. In spirulids and sepiids, there is only one key stage. In Mesozoic belemnoids, spirulids, and sepiids, hatching accordingly occurred with a total shell length of less than 2 mm, which corresponds to mantle lengths of small planktonic hatchlings. Production of small pelagic hatchlings and thus small eggs was therefore the dominant reproductive strategy within the Coleoidea. The first evidence of enlarged hatchlings appeared during the Maastrichtian in Groenlandibelus. During the Eocene, the large-egg strategy apparently became more widespread, particularly in belosaepiids.

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Techniques for Estimating the Age and Growth of Molluscs: Cephalopoda

Cited by 43 publications

References 61 publications

Correlation of shell and aptychus growth provides insights into the palaeobiology of a scaphitid ammonite

Correlation of shell and aptychus growth provides insights into the palaeobiology of a scaphitid ammonite

Acute-Stress Biomarkers in Three Octopodidae Species After Bottom Trawling

Evolution of reproductive strategies in coleoid mollusks

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