Pseudoinversion of septal sutures in Middle Jurassic–Lower Cretaceous non-heteromorph ammonites

Abstract

New records of ammonites showing poorly known sutural anomaly, so-called sutural pseudoinversion, are discussed. For the first time, sutural pseudoinversion was found in non-heteromorph Jurassic and Lower Cretaceous ammonoids, which are belonging to 10 genera (Dorsetensia, Indosphinctes, Erymnoceras, Pictonia, Aspidoceras, Kachpurites, Craspedites, Delphinites, Nikitinoceras and Immunitoceras) and 8 families (Sonniniidae, Pseudoperisphinctidae, Pachyceratidae, Aulacostephanidae, Aspidoceratidae, Craspeditidae, Neocomitidae and Parahoplitidae). Two types of sutural pseudoinversion were recognized: normal sutural pseudoinversion, in which the outline of small elements in lobes and saddles is fully reversed, and transitional sutural pseudoinversion, characterized by changes in the outline of folioles only. Usually, sutural pseudoinversion occurs in the terminal part of the phragmocone and becomes especially clear on the last sutures near the body chamber, but in some studied specimens sutural pseudoinversion appears in middle whorls and can be traced further up to the last visible sutures. Sutural pseudoinversion could not be caused by mechanical compression of saddles due to sutural asymmetry or strong development of sculptural elements as Bayer (Lethaia 11:307-313, 1978) assumed. Pseudoinversion is usually (although not always) visible in all sutural elements. Although pseudoinversion is known in those taxa with strong sutural asymmetry, pseudoinversion and asymmetry often affected different specimens. Influence of hydrostatic overpressure during the septal formation as well as parasite infestation on development of sutural pseudoinversion is considered to be unlikely. Instead, an abnormality appears to be a case of homeotic mutation, possibly caused by transcription errors in polarity genes. Much more common occurrence of sutural pseudoinversion in ammonites than it was expected previously suggest that it could be a relatively common phenomenon that needs increased attention in the future.

Recent advances in heteromorph ammonoid palaeobiology

“…Pseudoinversion has been reported for the Late Cretaceous heteromorphs Glyptoxoceras (Westermann, 1975; Ward & Westermann, 1976) and Baculites (Henderson et al ., 2002). Rogov (2018) found this in several Jurassic and Cretaceous monomorphs. Another internal abnormality of the ammonoid conch is sutural asymmetry relative to the venter, while the conch wall is unaffected [forma aegra juxtalobata (Landman & Waage, 1986; Keupp, 2012)].…”

When Abnormality Becomes Perennial in a Reduced Population: The Case of Altudostephanus longicostis gen. et sp. nov. (Valanginian Ammonites, South-Eastern France)

“…nov., where the character 'longitudinal ribs' is passed on to the offspring as part of the phenotype of the species, allows us to propose that this ability to reverse the ribs could maybe have a genetic cause (like a switch), linked, for example, to the expression of architect genes. An interesting parallel could be made with suture pseudoinversion; Rogov (2019) [38] considered that in some cases, this abnormality could be related to genetic causes, such as a case of homeotic mutation, possibly caused by transcription errors in polarity genes. The character 'longitudinal ribs' is however exceptionally rare within populations beyond the Middle Jurassic (and belonging to other superfamilies or even suborders), to such an extent that its expression becomes an anomaly: in the context of numerically large populations (tending towards the Hardy-Weinberg theoretical equilibrium, e.g., Lachance, 2016 [39]), as among Passendorferia, a form of standardization tends to take over the random mutations that could be expressed and makes them disappear.…”

Special issue: Cephalopods through time

“…Linzmeier (2019) consolidates his reputation as a young researcher employing sophisticated state-of-the-art methods with his article on oxygen isotopes in fossil cephalopods. Rogov (2019) reports new findings of ammonites with inverted sutures.…”