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Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)

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Abstract
Ostracods belonging to the genus Bennelongia differ much in valve morphology between adults and juveniles. Adult valves are asymmetrical, characterised by a beak-like feature in the antero-ventral region of the left valve, and, with some notable exceptions, mostly have smooth or weakly-ornamented valves. Juvenile specimens, on the other hand, have valves that are almost symmetrical, with no beak-like feature and are often heavily ornamented. We have examined the last 3 - 4 juvenile stages of 6 Bennelongia species from 5 different lineages, in order to decipher the types of external valve ornamentation and their recurrences during ontogeny and across lineages. It is clear that ornamentation is more prevalent at the early instar stages compared to the last 2 pre-adult stages, and especially when compared to the adult stage itself. We also examined the surprising presence of a calcified inner lamella with a prominent inner list in the pre-adult stages of Bennelongia species, that is usually absent in juveniles of other ostracods, thus questioning if heterochronic processes have provided an intermediate valve morphology between the simple (normal) cypridinid juvenile state and the heavily derived and modified state of adult Bennelongia. We discuss the possible (speculative) functionality of the ornamentation in juveniles.

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MLA
De Deckker, Patrick, and Koenraad Martens. “Extraordinary Morphological Changes in Valve Morphology During the Ontogeny of Several Species of the Australian Ostracod Genus Bennelongia (Crustacea, Ostracoda).” EUROPEAN JOURNAL OF TAXONOMY 36 (2013): 1–37. Print.
APA
De Deckker, P., & Martens, K. (2013). Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda). EUROPEAN JOURNAL OF TAXONOMY, 36, 1–37.
Chicago author-date
De Deckker, Patrick, and Koenraad Martens. 2013. “Extraordinary Morphological Changes in Valve Morphology During the Ontogeny of Several Species of the Australian Ostracod Genus Bennelongia (Crustacea, Ostracoda).” European Journal of Taxonomy 36: 1–37.
Chicago author-date (all authors)
De Deckker, Patrick, and Koenraad Martens. 2013. “Extraordinary Morphological Changes in Valve Morphology During the Ontogeny of Several Species of the Australian Ostracod Genus Bennelongia (Crustacea, Ostracoda).” European Journal of Taxonomy 36: 1–37.
Vancouver
1.
De Deckker P, Martens K. Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda). EUROPEAN JOURNAL OF TAXONOMY. 2013;36:1–37.
IEEE
[1]
P. De Deckker and K. Martens, “Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda),” EUROPEAN JOURNAL OF TAXONOMY, vol. 36, pp. 1–37, 2013.
@article{8605945,
  abstract     = {Ostracods belonging to the genus Bennelongia differ much in valve morphology between adults and juveniles. Adult valves are asymmetrical, characterised by a beak-like feature in the antero-ventral region of the left valve, and, with some notable exceptions, mostly have smooth or weakly-ornamented valves. Juvenile specimens, on the other hand, have valves that are almost symmetrical, with no beak-like feature and are often heavily ornamented. 
We have examined the last 3 - 4 juvenile stages of 6 Bennelongia species from 5 different lineages, in order to decipher the types of external valve ornamentation and their recurrences during ontogeny and across lineages. It is clear that ornamentation is more prevalent at the early instar stages compared to the last 2 pre-adult stages, and especially when compared to the adult stage itself. 
We also examined the surprising presence of a calcified inner lamella with a prominent inner list in the pre-adult stages of Bennelongia species, that is usually absent in juveniles of other ostracods, thus questioning if heterochronic processes have provided an intermediate valve morphology between the simple (normal) cypridinid juvenile state and the heavily derived and modified state of adult Bennelongia. 
We discuss the possible (speculative) functionality of the ornamentation in juveniles.},
  author       = {De Deckker, Patrick and Martens, Koenraad},
  issn         = {2118-9773},
  journal      = {EUROPEAN JOURNAL OF TAXONOMY},
  language     = {eng},
  pages        = {1--37},
  title        = {Extraordinary morphological changes in valve morphology during the ontogeny of several species of the Australian ostracod genus Bennelongia (Crustacea, Ostracoda)},
  url          = {http://dx.doi.org/10.5852/ejt.2013.36},
  volume       = {36},
  year         = {2013},
}

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