Age-influenced morphological changes in Leptestheria saetosa Marinček et Petrov, 1992 (Conchostraca, Crustacea)

Petrov, Brigita; Marinček, Magdalena

doi:10.1007/978-94-011-0291-9_23

Cited by 4 publications

(5 citation statements)

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“…Setae of a post‐moult limb can be observed within both morphs of both sexes. Adult size polymorphism has been reported in another leptestheriid (Petrov & Marincek, 1995), and we concur with Tasch (1969) that there is no terminal adult moult and possibly no terminal moult for these spinicaudatans. The alternate hypothesis, that populations of both species maintain permanent, size‐dimorphic, terminal adults is not supported by the formation of setae of a post‐moult limb.…”

Section: Discussionsupporting

confidence: 92%

“…During development of the trunk limbs of L. kawachiensis , the discoid lobe appears before the attenuate lobe, but after the setae of the presumptive attenuate lobe have appeared. Palps are added during the moult from the last juvenile stage; palps of L. kawachiensis did not become segmented during adult development, as has been reported for L. saetosa Petrov & Marincek by Petrov & Marincek (1995).…”

Section: Discussionmentioning

confidence: 69%

“…Problems in understanding homologies of the male limbs in previous studies (e.g. Botnariuc, 1947; Shakoori, 1968; Petrov & Marincek, 1995) may result from an underestimate of the number of lobes present in the poorly sclerotized middle part of the limb. In our study, the morphology of the well‐sclerotized proximal part of transformed male trunk limbs 1–2 of C. gifuensis corresponds to that part of the female limb bearing enditic lobe 1, the attenuate lobe, and the discoid lobe.…”

Section: Discussionmentioning

confidence: 97%

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Comparative morphology among trunk limbs of Caenestheriella gifuensis and Leptestheria kawachiensis (Crustacea: Branchiopoda: Spinicaudata)

Ferrari

Grygier

2003

Zoological Journal of the Linnean Society

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Morphological differences among groups of the 24 trunk limbs of Caenestheriella gifuensis (Ishikawa, 1895) and differences between males and females are described and illustrated. A setose attenuate lobe located proximally near enditic lobe 1 and a discoid lobe covered with small setae proximal to enditic lobe 1 are newly described. The five ventral enditic lobes, endopod, exopod, and dorsal exite of traditional spinicaudatan morphology are redescribed. Trunk limbs 1-4 of females bear a palp on enditic lobe 5 and trunk limbs 1-15 of males bear a similar palp. A second, articulating palp is associated with the base of the endopod of trunk limbs 1-2 of males. The proximal part of trunk limbs 19-24, bearing enditic lobe 1, articulates by an arthrodial membrane with the remainder of the limb, and the exite is distal to this arthrodial membrane. Development of trunk limbs, ascertained through an examination of early juvenile instars of Leptestheria kawachiensis Uéno, 1927, includes an asetose limb followed in time by a series of setose limbs that increase in morphological complexity with age. The number of lobes on the asetose limb varies from seven (corresponding to five enditic lobes, an endopod, and an exopod) on anterior limbs to five on trunk limb 24, which lacks the lobes corresponding to enditic lobe 4 and the endopod; these two structures are added later to setose limbs. The attenuate lobe, the discoid lobe, the exite of all trunk limbs, and the palps of the anterior trunk limbs are added to the setose limbs. Development of anterior limbs is accelerated relative to that of posterior limbs, and development of the more posterior limbs is truncated relative to that of limbs immediately anterior to them. Enditic lobe 4 and the endopod of limbs like trunk limb 24 develop from, or are patterned by, enditic lobe 5; the articulating palp of male trunk limbs 1-2 also may be added in this way. A comparison of these observations with development of the copepod maxilliped suggests that the spinicaudatan trunk limb is composed of a praecoxa with three lobes, a coxa and a basis each with one lobe, and an endopod of three segments in females and four in males. This is similar to the homology scheme previously proposed by Hansen in 1925. A critique is given of attempts to homologize parts of arthropod limbs based on developmental gene expression patterns. Stenopodal to phyllopodal transformations of maxillipeds in copepods provide a model at least partly applicable to spinicaudatans, and a 'multibranched' interpretation of spinicaudatan (and by extension branchiopodan) limb morphology is rejected. There is nothing intrinsic to the structure of the adult trunk limbs suggesting that they are similar to the adult limbs of the ancestral branchiopod or the ancestral crustacean, but early developmental steps of more posterior limbs are good matches for the morphology of an ancestral crustacean biramal limb predicted by a hypothesis of duplication of the proximo-distal axis.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 97%

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Comparative morphology among trunk limbs of Caenestheriella gifuensis and Leptestheria kawachiensis (Crustacea: Branchiopoda: Spinicaudata)

Ferrari

Grygier

2003

Zoological Journal of the Linnean Society

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“…Shu et al (1990) give a comparative table supposedly separating E. chinensis, E. dongpinensis and E. yanchowensis and similarly Zhang and Hu (1992) give a table separating their E. sanziensis from E. dongpingensis, but the supposed diff erences are minor in all the Chinese forms and could be due to variability of characters in separate populations. Th is argument is strengthened by Petrov and Marinček's (1995) study of age induced variability in the closely related Leptestheria saetosa Marinček and Petrov. Th ese authors show that many of the characters used in the separating of the various species of Eoleptestheria change with age, including proportions of the carapace, presence or absence of marginal hairs, shape of rostrum and occipital condyle, number of trunk segments equipped with dorsal spines, number of telsonic spines, and segmentation in the palp of the fi fth endite.…”

Section: Discussionmentioning

confidence: 99%

“…All four of these features could be an expression of even wider variation (cf. Straškraba 1965) or of change with age (Petrov and Marinček 1995), or be due to founder eff ects associated with a small number of dispersing eggs (Provine 2004). Th e most parsimonious conclusion is to consider the Australian populations as further variations within the E. ticinensis complex, rather than a separate species.…”

Section: Discussionmentioning

confidence: 99%

First records of a leptestherid clam shrimp in Australia (Crustacea, Spinicaudata, Leptestheriidae, Eoleptestheria)

Timms¹

2009

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Eoleptestheria ticinensis, a highly variable Eurasian species, was collected from three widely separated sites in northern Australia. Each population is described and compared with the eight described species of Eoleptestheria, now all synonyms of E. ticinensis. It is postulated that the Australian occurrences of these clam shrimps are initiated or maintained by dispersal due to migrating birds from China.

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Hamer

Martens

1998

Hydrobiologia

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Age-influenced morphological changes in Leptestheria saetosa Marinček et Petrov, 1992 (Conchostraca, Crustacea)

Cited by 4 publications

References 1 publication

Comparative morphology among trunk limbs of Caenestheriella gifuensis and Leptestheria kawachiensis (Crustacea: Branchiopoda: Spinicaudata)

Comparative morphology among trunk limbs of Caenestheriella gifuensis and Leptestheria kawachiensis (Crustacea: Branchiopoda: Spinicaudata)

First records of a leptestherid clam shrimp in Australia (Crustacea, Spinicaudata, Leptestheriidae, Eoleptestheria)

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