Sexual Differentiation of<i>Octopus hubbsorum</i>(Mollusca: Cephalopoda) Using Body Dimensions and the Shape and Size of the Stylets: A Traditional and Geometric Morphometric Analysis

López-Galán, Alejandra; Alejo-Plata, María del Carmen

doi:10.4003/006.033.0213

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Group 3 is the CB station, as illustrated in Figures 10a and 11, and detailed in Table A2. The discrimination analysis of female and male cephalopods yielded significant findings [24][25][26]. The percentage of discriminant accuracy for seven groups of females ranged from 55% to 100%.…”

Section: Morphological Variations Of S Inermismentioning

confidence: 99%

Morphological Variation and New Description of the Subcutaneous Gland of Sepiella inermis (Van Hasselt, 1835) in Thai Waters

Phuynoi,

Sukhsangchan,

et al. 2024

Diversity

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The external morphology and morphological variations of Sepiella inermis vary across regions, necessitating investigation. However, the histological information on the subcutaneous gland has been insufficient to describe it. In this study, specimens were systematically collected and characterized from the Gulf of Thailand. Regarding external morphology, female cuttlebones exhibit greater width and more pronounced curves compared to males, while males feature 17–19 white dots along the fin margins. The presence of the subcutaneous gland was discerned during the embryonic stage at stage 19. A histological study of the subcutaneous gland illustrated the structure and development of the gland in both embryonic and adult stages, with four layers of membranes covering the gland. In the adult stage, trabeculae are dispersed throughout the gland, whereas in the embryonic stage, they form four distinct lines. The morphometric analysis revealed significant differences between males and females (p < 0.05) and morphological variations among the seven locality groups within the sexes were observed (p < 0.05) in Chonburi Province. According to the discriminant analysis results, there were significant differences (p < 0.05) between the groups in Surat Thani Province. Examining the length–weight relationship between dorsal mantle length and body weight showed significant differences between the sexes, indicating an allometric growth.

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Section: Morphological Variations Of S Inermismentioning

confidence: 99%

Morphological Variation and New Description of the Subcutaneous Gland of Sepiella inermis (Van Hasselt, 1835) in Thai Waters

Phuynoi,

Sukhsangchan,

et al. 2024

Diversity

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“…Largely due to the specifics of the taxa themselves, the shells of different groups of mollusks have been studied extremely unevenly. For example, in studies of the modern cephalopod shells, GM-based analysis has only been applied once (López-Galán and del Carmen Alejo-Plata, 2015). In this research, traditional morphometrics and landmark-based GM analysis were applied to test gender differences in Octopus hubbsorum stylets.…”

Section: Shellsmentioning

confidence: 99%

Application of Shape Analyses to Recording Structures of Marine Organisms for Stock Discrimination and Taxonomic Purposes

Lishchenko

Jones

2021

Front. Mar. Sci.

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Morphometric analysis of biogenic recording structures within marine organisms has applications in stock assessment, taxonomics, and ecomorphological studies, with shape variation markedly influenced by both genetics and the surrounding environment. Geometric morphometrics (GM) is an alternative approach to the “traditional” method of collecting linear measurements and applying multivariate statistical methods to these data. Landmark- and outline-based GM methods are suggested to have several advantages over the “traditional” method. Due to the increasing popularity of GM methods in the modern literature, this chapter first compares different morphometric techniques, and then reviews the methods applied to recording structures, with a focus on GM outline-based analyses. It is clear that outline methods have become a popular method of analysis for structures such as otoliths, particularly for the purpose of distinguishing between population components. However, for other structures such as beaks this technique is only in its early stages of application and is more difficult to apply but shows great promise for future studies. The advantages of using a holistic approach, incorporating several techniques including outline analysis for stock identification purposes is discussed.

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Sexual Differentiation ofOctopus hubbsorum(Mollusca: Cephalopoda) Using Body Dimensions and the Shape and Size of the Stylets: A Traditional and Geometric Morphometric Analysis

Cited by 2 publications

References 33 publications

Morphological Variation and New Description of the Subcutaneous Gland of Sepiella inermis (Van Hasselt, 1835) in Thai Waters

Morphological Variation and New Description of the Subcutaneous Gland of Sepiella inermis (Van Hasselt, 1835) in Thai Waters

Application of Shape Analyses to Recording Structures of Marine Organisms for Stock Discrimination and Taxonomic Purposes

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