Isolation and identification of major ecdysteroids from the pycnogonidPycnogonum litorale (Str�m) (Arthropoda, Pantopoda)

Bückmann, Detlef; Starnecker, G.; Tomaschko, Karl-Heinz; Wilhelm, Eva; Lafont, René; Girault, Jean‐Pierre

doi:10.1007/bf00694248

Cited by 37 publications

(5 citation statements)

References 35 publications

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“…From these data the structure of 22-deoxy-20,26-dihydroxyeedysone is established. This compound is identical with that previously found in animals (37). Compound 27.-This compound has a mol wt of480.…”

Section: Resultssupporting

confidence: 82%

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Isolation and Identification of New Ecdysteroids from the Caryophyllaceae

Girault¹,

Báthori²,

Varga³

et al. 1990

J. Nat. Prod.

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Section: Resultssupporting

confidence: 82%

“…Compound 18.-This compound is identical with the synthetic reference compound 20-hydroxyecdysone 22-acetate, a compound already found in snails (26), pycnogonids (37), and insects (39). Its nmr spectrum has the characteristics of 20hydroxy compounds (a) and for 22-acetylation (e).…”

Section: Resultssupporting

confidence: 52%

Isolation and Identification of New Ecdysteroids from the Caryophyllaceae

Girault¹,

Báthori²,

Varga³

et al. 1990

J. Nat. Prod.

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“…This also applies to a marine arachnid, Pycnogonum littorale (Bü ckmann et al 1986). In the latter case, it was clearly demonstrated that ecdysteroids are stored within the epidermis and released through cuticular holes into the surrounding water when the animal is attacked (by a crab), which results in an efficient deterrent/antifeedant effect (Tomaschko 1994;.…”

Section: Coelenterates and Spongesmentioning

confidence: 95%

Steroids in aquatic invertebrates

2007

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Steroid molecules are present in all invertebrates, and some of them have established hormonal roles: this is the case for ecdysteroids in arthropods and, to a lesser extent, for vertebrate-type steroids in molluscs. Steroids are not only hormones, they may also fulfill many other functions in chemical communication, chemical defense or even digestive physiology. The increasing occurrence of endocrine disruption problems caused by environmental pollutants, which interfere in particular with reproductive physiology of vertebrates but also of invertebrates has made necessary to better understand the endocrine physiology of the latter and the role of steroids in these processes. So many attempts are being made to better understand the endocrine roles of steroids in arthropods and molluscs, and to establish whether they also fulfill similar functions in other invertebrate phyla. At the moment, both the precise identification of these steroids, the determination of their origin (endogenous versus exogenous) and of their mechanism of action are under active investigation. This research takes profit of the development of genome sequencing programs on many invertebrate species, which allow the identification of receptors and/or biosynthetic enzymes, when related to their vertebrate counterparts, but the story is not so simple, as will be exemplified by estrogen receptors of molluscs.

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“…The larvae of this species were among the first to be discovered; original descriptions date to the 19th century (Dohrn, ; Hoek, ). Numerous later works detail its embryonic (Dogiel, ; Machner & Scholtz, ; Ungerer & Scholtz, ) and postembryonic development (Behrens, ; Dogiel, ; Schmidt & Bückmann, ; Tomaschko et al, ; Vilpoux & Waloszek, ; Wilhelm, Bückmann, & Tomaschko, ), adult anatomy (Helfer & Schlottke, ; Jarvis & King, , ; Scholtz & Brenneis, ), biochemistry of molting (Bückmann et al, ; Bückmann & Tomaschko, ; Tomaschko, ), systematics (Entrop, ; King & Crapp, ) and biogeography (e.g., Esquete, Rubal, Veiga, & Troncoso, ; Ringvold, Hassel, Bamber, & Buhl‐Mortensen, ).…”

Section: Introductionmentioning

confidence: 99%

The (not very) typical protonymphons of Pycnogonum litorale

Alexeeva

Tamberg

Shunatova

2019

Journal of Morphology

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Sea spiders are unique and poorly known marine chelicerates. Their larvae are even less studied, especially at the ultrastructural level. Here, we examined the hatchlings of Pycnogonum litorale (Strøm, 1,762) using histology, SEM and TEM. Existing classifications place these larvae among "typical" protonymphons, together with Nymphon brevirostre. Our results, however, revealed major differences between the two species. Hatchlings of P. litorale are endotrophic for 1-2 weeks, with yolk deposits in the body wall and a reduced secretory apparatus. They lack a body cavity, demonstrate an unusual modification of the midgut sheath cells and a complex subesophageal ganglion, which includes neuromeres of the prospective walking legs 1. These larvae also possess well-developed glia and complex sensory structures: eyes, V-shaped mechanoreceptive bristles, integrated chemo-and mechanoreceptors, and three types of concealed mechanoreceptors embedded into the body wall and only seen on the sections. In this paper we also propose a new interpretation of the pycnogonid larval types: we present a set of traits useful for diagnosis and a preliminary classification.Finally, we discuss the complexity of glial types in sea spiders and other arthropods.

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Isolation and identification of major ecdysteroids from the pycnogonidPycnogonum litorale (Str�m) (Arthropoda, Pantopoda)

Cited by 37 publications

References 35 publications

Isolation and Identification of New Ecdysteroids from the Caryophyllaceae

Isolation and Identification of New Ecdysteroids from the Caryophyllaceae

Steroids in aquatic invertebrates

The (not very) typical protonymphons of Pycnogonum litorale

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