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A complete survey of normal pores on a smooth shell ostracod (Crustacea): landmark-based versus outline geometric morphometrics


Karanovic, I and Lavtizar, V and Djurakic, M, A complete survey of normal pores on a smooth shell ostracod (Crustacea): landmark-based versus outline geometric morphometrics, Journal of Morphology, 278, (8) pp. 1091-1104. ISSN 0362-2525 (2017) [Refereed Article]

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Copyright 2017 Wiley Periodicals

DOI: doi:10.1002/jmor.20696


Pores and sensilla on ostracod shell have often been used in studies of ontogeny, taxonomy, and phylogeny of the group. However, an analysis of sexual dimorphism and variation between valves in the number and distribution of pores is lacking. Also, such studies have never been done on a widely distributed, morphologically variable, and weakly ornamented freshwater ostracod. Here, we survey pores in one such species, Physocypria kraepelini. We choose 27 homologous pores as landmarks for 2D-geometric morphometric analysis, with the aim to assess intersexual and between valves variation in size and shape relative to the Fourier outline analysis. This species has only simple (Type A) pores with and without a lip, and each pore carries an undivided sensory seta. Our results show that the total number of pores varies (from 270 to 296), but this is not associated with a specific valve. Males carry fewer pores than females, however no sex specific pores are found. Small intrapopulation divergence of the Cyt b molecular marker (1%) indicates that morphological variability is not species related. We found that P. kraepelini exhibits directional asymmetry of size and shape, sexual size dimorphism (SSD) but lacks sexual shape dimorphism (SShD). Two geometric morphometrics methods were congruent in the estimation of SSD, SShD, and directional asymmetry of shape but differ in the statistical evaluation of directional asymmetry of size. Contrary to other animal groups, our study suggests that ostracods have more pronounced directional asymmetry of shape compared to directional asymmetry of size.

Item Details

Item Type:Refereed Article
Keywords:cytochrome b, 2D-geometric morphometrics, directional asymmetry, Elliptic Fourier analysis, normal pores, sexual dimorphism
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Animal systematics and taxonomy
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Karanovic, I (Professor Ivana Karanovic)
ID Code:123232
Year Published:2017
Web of Science® Times Cited:7
Deposited By:Ecology and Biodiversity
Deposited On:2017-12-21
Last Modified:2018-05-30

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