Scorpion katoikogenic ovariuterus – Much more alike to apoikogenic type than it seemed to be

Jędrzejowska, Izabela; Szymusiak, Kamil; Mazurkiewicz-Kania, Marta; Garbiec, Arnold

doi:10.1016/j.asd.2016.09.001

Cited by 4 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These sensory appendages are oriented towards the substrate and are used to probe and analyse the environment regarding chemo-and mechanosensory stimuli [11,73,[75][76][77]. In general, the external morphology of pectines is rather conserved in scorpions, although number, morphology, and orientation of peg sensillae can vary between species and seem to be related to environmental conditions (Figs 1 and 2) [11,66,75,[77][78][79][80].…”

Section: The Chemosensory Pathway In Scorpionsmentioning

confidence: 99%

Structure of the pecten neuropil pathway and its innervation by bimodal peg afferents in two scorpion species

Wolf

Stemme

2020

PLoS ONE

View full text Add to dashboard Cite

The pectines of scorpions are comb-like structures, located ventrally behind the fourth walking legs and consisting of variable numbers of teeth, or pegs, which contain thousands of bimodal peg sensillae. The associated neuropils are situated ventrally in the synganglion, extending between the second and fourth walking leg neuromeres. While the general morphology is consistent among scorpions, taxon-specific differences in pecten and neuropil structure remain elusive but are crucial for a better understanding of chemosensory processing. We analysed two scorpion species (Mesobuthus eupeus and Heterometrus petersii) regarding their pecten neuropil anatomy and the respective peg afferent innervation with anterograde and lipophilic tracing experiments, combined with immunohistochemistry and confocal laser-scanning microscopy. The pecten neuropils consisted of three subcompartments: a posterior pecten neuropil, an anterior pecten neuropil and a hitherto unknown accessory pecten neuropil. These subregions exhibited taxon-specific variations with regard to compartmentalisation and structure. Most notable were structural differences in the anterior pecten neuropils that ranged from ovoid shape and strong fragmentation in Heterometrus petersii to elongated shape with little compartmentalisation in Mesobuthus eupeus. Labelling the afferents of distinct pegs revealed a topographic organisation of the bimodal projections along a medio-lateral axis. At the same time, all subregions along the posterior-anterior axis were innervated by a single peg’s afferents. The somatotopic projection pattern of bimodal sensillae appears to be common among arachnids, including scorpions. This includes the structure and organisation of the respective neuropils and the somatotopic projection patterns of chemosensory afferents. Nonetheless, the scorpion pecten pathway exhibits unique features, e.g. glomerular compartmentalisation superimposed on somatotopy, that are assumed to allow high resolution of substrate-borne chemical gradients.

show abstract

Section: The Chemosensory Pathway In Scorpionsmentioning

confidence: 99%

Structure of the pecten neuropil pathway and its innervation by bimodal peg afferents in two scorpion species

Wolf

Stemme

2020

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…However, different from the aforementioned mechanisms, the lumen does not form de novo, but, at certain (advanced) stage of diverticulum development. Moreover, in katoikogenic scorpions, the lumen of the diverticulum develops between the epithelial stalk cells, whose apico‐basal polarization has been established much earlier, that is, during early stages of diverticula development (for details of the stalk cells' polarity in katoikogenic scorpions see: Jędrzejowska et al, , Figure b,d, and this contribution Figures b and a). Therefore, the mode of lumen formation within diverticulum in katoikogenic scorpions does not precisely correspond to any of the principal mechanisms of de novo lumen formation.…”

Section: Discussionmentioning

confidence: 99%

“…The proximal part is long and cylindrical and joins the diverticulum with the wall of the ovariuterine tubules. The distal part is short and slightly convex and comprises the oocyte (Jędrzejowska, Szymusiak, Mazurkiewicz‐Kania, & Garbiec, ; Mathew, ). The wall of the diverticulum consists of two cell layers, internal and external, which show continuity with two epithelial layers of the ovariuterine tubules (Laurie, ).…”

Section: Introductionmentioning

confidence: 99%

“…The wall of the diverticulum consists of two cell layers, internal and external, which show continuity with two epithelial layers of the ovariuterine tubules (Laurie, ). In the distal part, the internal cell layer (called follicular) directly covers the oocyte surface, whereas in the proximal part the cells of the internal layer (termed stalk cells) entirely fill the axial part of the diverticulum (Jędrzejowska et al, ). During embryonic development, the structure of the diverticulum changes and four distinct regions of the diverticulum are distinguishable: a long stalk, a thickened collar, a conical portion, and a long appendix (Laurie, ; Polis & Sissom, ).…”

Section: Introductionmentioning

confidence: 99%

“…The female gonads of katoikogenic scorpions show considerable morphological modifications in comparison to other chelicerates. As reviewed earlier(Jędrzejowska et al, 2016), the structure of the diverticulum is complex and consists of stalk cells (typical of chelicerates), follicular cells (rare among chelicerates), and external layer cells (unique for katoikogenic scorpions), the diverticulum is involved in several functions: fertilization, oocyte growth, and embryo development and nutrition.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Formation of the diverticular lumen that enables oocyte fertilization in katoikogenic scorpions, Heterometrus spinifer and Opistophthalmus boehmi (Scorpionidae)

Jędrzejowska

Maltz

Szymusiak

2019

Journal of Morphology

Self Cite

View full text Add to dashboard Cite

The structure of diverticula of the female gonads was analyzed in two scorpions from the family Scorpionidae by means of standard microscopic techniques (light microscopy, histochemistry, transmission electron microscopy). In scorpions, the female gonad, termed the ovariuterus, participates in two consecutive processes: oogenesis and embryogenesis. In sexually reproducing scorpions, the ovariuterus is also involved in fertilization. Both scorpions under study reproduce sexually. They also represent the katoikogenic type of development, which means that oogenesis, fertilization, and embryogenesis take place in the diverticula, which are sac‐like outpocketings of the ovariuterine tubules. Formation of a lumen in the diverticulum is indispensable for sperm entry to enable fertilization and subsequent embryogenesis. The aim of the study was to test our hypothesis that the diverticulum lumen forms due to the engagement of the centrally located stalk cells. In this report, we show that in two species of katoikogenic scorpions, at the final stages of oogenesis, the cytoplasm of the stalk cells contains secretory organelles. In the stages preceding fertilization, secretory activity of the stalk cells and fragmentation of their apical parts lead to formation of the diverticulum lumen by a process similar to “cord hollowing” that commonly occurs for lumen formation in other morphogenesis model systems.

show abstract

Morphology of Ovaries and Oogenesis in Chelicerates

Jędrzejowska

2019

Results and Problems in Cell Differentiation

View full text Add to dashboard Cite

Scorpion katoikogenic ovariuterus – Much more alike to apoikogenic type than it seemed to be

Cited by 4 publications

References 27 publications

Structure of the pecten neuropil pathway and its innervation by bimodal peg afferents in two scorpion species

Structure of the pecten neuropil pathway and its innervation by bimodal peg afferents in two scorpion species

Formation of the diverticular lumen that enables oocyte fertilization in katoikogenic scorpions, Heterometrus spinifer and Opistophthalmus boehmi (Scorpionidae)

Morphology of Ovaries and Oogenesis in Chelicerates

Contact Info

Product

Resources

About