The taxonomic status of the genus Hubertoceras Spath: A new light on sexual dimorphism from the Callovian ammonites of Kutch, India

Dutta, Rakhi; Bardhan, Subhendu; Paul, Sandip; Mondal, Subhronil

doi:10.26879/738

Cited by 1 publication

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References 22 publications

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“…Because shell size and shape are often used as diagnostic characteristics in species’ taxonomy, it is important to understand the effects of sexual dimorphism on these traits. Sexual dimorphism can be observed in a shell’s surface ornamentations ( Dutta et al, 2017 ), size ( Jokinen, Guerette & Kortmann, 1982 ; Son, 1997 ; Estebenet & Cazzaniga, 1998 ; Glöer, Albrecht & Wilke, 2007 ; Pastorino, 2007 ; Kurata & Kikuchi, 2000 ; Son & Hughes, 2000 ; Minton & Wang, 2011 ; Ng et al, 2019 ; Páll-Gergely et al, 2020 ), shape ( Jokinen, Guerette & Kortmann, 1982 ; Keawjam, 1987 ; Son & Hughes, 2000 ; Minton & Wang, 2011 ; Márquez & Averbuj, 2017 ), and pigmentation ( Gofas, 2001 ; Schilthuizen, Sipman & Zwaan, 2017 ). The driving forces that cause dimorphisms in shell characteristics are generally related to reproductive selection ( Pastorino, 2007 ; Collin, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Sexual dimorphism in shell size of the land snail Leptopoma perlucidum (Caenogastropoda: Cyclophoridae)

Phung

Choo

Liew

2022

PeerJ

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Sexual dimorphism in the shell size and shape of land snails has been less explored compared to that of other marine and freshwater snail taxa. This study examined the differences in shell size and shape across both sexes of Leptopoma perlucidum land snails. We collected 84 land snails of both sexes from two isolated populations on two islands off Borneo. A total of five shell size variables were measured: (1) shell height, (2) shell width, (3) shell spire height, (4) aperture height, and (5) aperture width. We performed frequentist and Bayesian t-tests to determine if there was a significant difference between the two sexes of L. perlucidum on each of the five shell measurements. Additionally, the shell shape was quantified based on nine landmark points using the geometric morphometric approach. We used generalised Procrustes and principal component analyses to test the effects of sex and location on shell shape. The results showed that female shells were larger than male shells across all five measurements (all with p-values < 0.05), but particularly in regards to shell height and shell width. Future taxonomic studies looking to resolve the Leptopoma species’ status should consider the variability of shell size caused by sexual dimorphism.

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