Ultrastructural characterization of the gonads of Triops 
cancriformis (Crustacea, Notostraca) from populations containing both females and males: no evidence for hermaphroditic reproduction

Engelmann, Mario; Hahn, Tom; Hoheisel, G

doi:10.1007/s004350050042

Cited by 14 publications

(10 citation statements)

References 11 publications

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“…The reproductive variability was linked in the past to the unstable environment these animals generally face, i.e. ephemeral ponds (Engelmann et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Molecular taxonomy and phylogeny of ItalianLepidurustaxa (Branchiopoda: Notostraca)

Mantovani

Cesari

Scanabissi

2009

Italian Journal of Zoology

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Notostraca taxonomy is controversial, mainly owing to the high intraspecific variability of morphological characters; other complexity factors are represented by the consistent rate of reproductive variation. We undertook the molecular analyses of Italian Lepidurus taxa through the characterization of 12S, 16S and COI mitochondrial genes in new L. apus demes and in the L. couesii populations recently discovered in Southern Italy. For L. apus, the analysis of a wider data set (both in terms of molecular markers and of analysed populations) confirms the previously suggested specific rank of differentiation between its so far recognized subspecies, the Italian L. apus lubbocki and the European L. apus apus. The Italian L. couesii samples pertain to a well-defined taxonomic entity, strictly related to Canadian L. couesii. In 12S dendrograms, this taxon strongly diverges from the other North American Lepidurus species, but the relationships among nearctic taxa are unresolved. On the other hand, a high affinity between Italian/Canadian L. couesii and the circumpolar species L. arcticus is scored and a possible descent from a common ancestor is hypothesized.

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“…The reproductive variability was linked in the past to the unstable environment these animals generally face, i.e. ephemeral ponds (Engelmann et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Molecular taxonomy and phylogeny of ItalianLepidurustaxa (Branchiopoda: Notostraca)

Mantovani

Cesari

Scanabissi

2009

Italian Journal of Zoology

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“…While the latter comprises parthenogenetic females with an all-female progeny (thelytoky), the former can be either gonochoric, with distinct female and male individuals, or hermaphroditic with individuals producing both male and female gametes (Trusheim, 1938;Longhurst, 1955;Wingstrand, 1978;Zaffagnini and Trentini, 1980;Fryer, 1985;Eder et al, 1996;Engelmann et al, 1997;Scanabissi and Mondini, 2002;Scanabissi et al, 2005). The sexuality of a population is difficult to determine on morphological grounds, the only diagnostic characters being the modification of the eleventh pair of trunk appendages in both sexes and the presence/absence of eggs (Mathias, 1937;Fryer, 1988;Engelmann et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Mitochondrial and nuclear DNA variability in the living fossil Triops cancriformis (Bosc, 1801) (Crustacea, Branchiopoda, Notostraca)

et al. 2008

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The living fossil Triops cancriformis comprises bisexual (either gonochoric or hermaphroditic) and unisexual populations. Genetic surveys have recently revealed a general trend of low differentiation of 12S and 16S mitochondrial genes. We, therefore, surveyed further mitochondrial (COI gene and control region) and nuclear markers (dinucleotide microsatellites) to assess the genetic variability and to establish any relationship with the different reproductive modes found in European populations. The mitochondrial analyses confirmed the pattern of low variability. Hence, the low mitochondrial genetic variability appears as a common feature of the genus Triops. The microsatellite analysis found that Italian populations are monomorphic or exhibit little polymorphism, while other European samples display a higher degree of polymorphism and private alleles. Spanish, Austrian and Italian populations show patterns of Hardy-Weinberg disequilibrium that could be explained by the mode of reproduction, or by a higher frequency of null alleles in these populations. The low diversity and differentiation among Italian populations lead us to question the Monopolization Hypothesis. One microsatellite locus appears to be sex-linked, with heterozygotes detected only in males and hermaphrodites.

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“…The bisexual populations have reduced gene flow and high interpopulation divergence (regional differentiation). Engelman et al (1997) reported that these reproductive modes are extremely complex and not fully understood; they found that sex ratio is equal in North African and South European populations and changes gradually in northerly regions until unisexual (all female) populations; at this point they noticed testicular lobes within the female gonads. Golzari et al (2009) found only one male T. cancriformis among 400 females in vernal pools of West Azerbaijan Province in Iran.…”

Section: Discussionmentioning

confidence: 96%

The large branchiopod, Triops cancriformis simplex (Gihi, 1921) (Crustacea: Notostraca) in temporary rain pools, recorded for the first time in Taif-KSA

Hassan

2015

The Journal of Basic & Applied Zoology

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The present species Triops cancriformis simplex was not recorded in Taif and Kingdom of Saudi Arabia before. The present work is a confirmatory study to indicate the identity of this species in the ephemeral freshwater bodies in Taif, KSA and to ascertain that, if there is any other Triops species in the same area or not. Four sites were investigated in Taif governorate; Wadi Al-Arj, Saysed, Jabajeb pool and Ghadeer Al-Banat. The animal was not recorded in the first two sites all the year. The specimens were collected from Jabajeb pool on Al-Hada road and Ghadeer Al-Banat at Al-Roddaf region. No specimens were found in these sites during winter and autumn but they start in late spring and summer. One hundred and seven specimens were collected from both sites in this period. The animal was morphologically described to be distinguished from the other large branchiopods species. The supra-anal plate is absent, the dorsal organ of the present species is rounded, second maxilla is present, no supernumerary spines on apodous rings, the carina of T. c. simplex is smooth without spines in front of its terminal spine and presence of small spines on the furca. ª 2015 The Egyptian German Society for Zoology. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Ultrastructural characterization of the gonads of Triops cancriformis (Crustacea, Notostraca) from populations containing both females and males: no evidence for hermaphroditic reproduction

Cited by 14 publications

References 11 publications

Molecular taxonomy and phylogeny of ItalianLepidurustaxa (Branchiopoda: Notostraca)

Molecular taxonomy and phylogeny of ItalianLepidurustaxa (Branchiopoda: Notostraca)

Mitochondrial and nuclear DNA variability in the living fossil Triops cancriformis (Bosc, 1801) (Crustacea, Branchiopoda, Notostraca)

The large branchiopod, Triops cancriformis simplex (Gihi, 1921) (Crustacea: Notostraca) in temporary rain pools, recorded for the first time in Taif-KSA

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