Nematocysts of the Mediterranean hydroid Halocordyle disticha

Östman, C.; Piraino, Stefano; Kem, William R.

doi:10.1007/978-94-011-3240-4_85

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…We believe that their microbasic euryteles were actually mis-identified microbasic mastigophores. We have never seen any basitrichous haplonemes and neither did Ostman et al (1991).…”

Section: Discussionmentioning

confidence: 99%

The variation of Halocordyle disticha (Cnidaria, Athecata) from the Brazilian coast: an environmental indicator species?

Silveira

Migotto

1991

Hydrobiologia

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The rediscovery of Halocardylefragilis Vannucci, of which the type material is lost, led us to consider it a variety of Halocardyle disticha (Goldfuss) that occurs in calm waters on soft bottoms. The typical H. disticha is open feather-shaped, with branching in one plane, while H. fragilis is bushy, much larger, with branching in many planes. The different habit of H. disticha is probably due to environmental conditions. The bushy and pinnate forms are considered extremes of a range of morphological variation.

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“…We believe that their microbasic euryteles were actually mis-identified microbasic mastigophores. We have never seen any basitrichous haplonemes and neither did Ostman et al (1991).…”

Section: Discussionmentioning

confidence: 99%

The variation of Halocordyle disticha (Cnidaria, Athecata) from the Brazilian coast: an environmental indicator species?

Silveira

Migotto

1991

Hydrobiologia

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“…Squash preparations of living S. viduatus for nematocyst studies in light microscope (LM) and scanning electron microscope (SEM) were made as described before (Östman ; Östman et al . ). Microscopes and connected equipments, nematocyst identification and terminology were as described by Östman () and Östman et al .…”

Section: Methodsmentioning

confidence: 97%

Cnidae in the sea anemone Sagartiogeton viduatus (Muller, 1776) (Cnidaria, Anthozoa); A comparison to cnidae in the sea anemone Metridium senile (Linnaeus, 1761) (Cnidaria, Anthozoa)

Östman

Borg²,

Roat

et al. 2012

Acta Zoologica

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The cnidom of the sea anemone Sagartiogeton viduatus (Muller, 1776) is described from interference‐contrast light micrographs (LMs) and scanning electron micrographs (SEMs). Special attention is given to nematocyst maturation, including the differentiation of the shaft into proximal and main regions as helical folding of the shaft wall proceeds. Comparisons are made with Metridium senile (Linnaeus, 1761), whose cnidom, with a few exceptions, is closely similar to that of S. viduatus. The two anemones possess b‐ and p‐mastigophores, p‐amastigophores, isorhizas and spirocysts. Although the majority of cnidae in S. viduatus is smaller than corresponding ones in M. senile, they are grouped into the same size classes as those of M. senile, namely small, medium and large. The main differences from M. senile cnidae are the followings: (1) Large acontia p‐amastigophores are the largest nematocysts in S. viduatus. (2) They are noticeably larger than the large acontia b‐mastigophores, and (3) they are separated from the p‐amastigophores of M. senile by the sinusoid pattern of their U‐shaped capsular matrix. (4) The large acontia b‐mastigophores are microbasic and not mesobasic as in M. Senile, and (5) they do not produce darts. (6) Another difference from M. senile is the absence of catch‐tentacle isorhizas.

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Ultrastructure of a novel eurytele nematocyst of Carybdea alata Reynaud (Cubozoa, Cnidaria)

et al. 2002

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The ultrastructural characteristics of nematocysts from the cubozoan Carybdea alata Reynaud, 1830 (Hawaiian box jellyfish) were examined using light, scanning and transmission electron microscopy. We reclassified the predominant nematocyst in C. alata tentacles as a heterotrichous microbasic eurytele, based on spine, tubule and capsule measurements. These nematocysts exhibited a prominent and singular stylet, herein referred to as the lancet. Discharged nematocysts from fixed tentacle preparations displayed the following structures: a smooth shaft base, lamellae, a hemicircumferential fissure demarking the proximal end of a stratified lancet, and a gradually tapering tubule densely covered with large triangularly shaped spines. The lancet remained partially adjoined to the shaft base in a hinge-like fashion in rapidly fixed, whole-tentacle preparations. In contrast, this structure was not observed in discharged nematocyst preparations which involved multiple transfer steps prior to fixation. Various approaches were designed to detect this structure in the absence of fixative. Detached lancets were located in proximity to discharged tubules in undisturbed coverslip preparations of fresh tentacles. In addition, examination of embedded nematocysts from fresh tentacles laid on polyacrylamide gels revealed still-attached lancets. To examine the function of this structure in prey capture, Artemia sp. laden tentacles were prepared for scanning electron microscopy. While carapace exteriors exhibited structures proximal to the lancet, i.e., the nematocyst capsule and shaft base, neither tubule nor lancet structures were visible. Taken together, the morphological data suggested a series of events involved in the discharge of a novel eurytele from C. alata.

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Nematocysts of the Mediterranean hydroid Halocordyle disticha

Cited by 7 publications

References 4 publications

The variation of Halocordyle disticha (Cnidaria, Athecata) from the Brazilian coast: an environmental indicator species?

The variation of Halocordyle disticha (Cnidaria, Athecata) from the Brazilian coast: an environmental indicator species?

Cnidae in the sea anemone Sagartiogeton viduatus (Muller, 1776) (Cnidaria, Anthozoa); A comparison to cnidae in the sea anemone Metridium senile (Linnaeus, 1761) (Cnidaria, Anthozoa)

Ultrastructure of a novel eurytele nematocyst of Carybdea alata Reynaud (Cubozoa, Cnidaria)

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