Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets
A new species of Akanthepsilonema and the first-stage juvenile of Glochinema trispinatum are described. Furthermore, additional morphological information is provided for Triepsilonema tripapillata. Animals originate from a cold-water coral degradation zone in the Porcupine Seabight area (North-East...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | English |
Published: |
The Society of Nematologists
2006
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586427 http://www.ncbi.nlm.nih.gov/pubmed/19259436 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:2586427 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:2586427 2023-05-15T17:38:38+02:00 Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets Raes, Maarten Decraemer, Wilfrida Vanreusel, Ann 2006-03 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586427 http://www.ncbi.nlm.nih.gov/pubmed/19259436 en eng The Society of Nematologists http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586427 http://www.ncbi.nlm.nih.gov/pubmed/19259436 © The Society of Nematologists 2006 Contributed Paper Text 2006 ftpubmed 2013-09-02T07:58:30Z A new species of Akanthepsilonema and the first-stage juvenile of Glochinema trispinatum are described. Furthermore, additional morphological information is provided for Triepsilonema tripapillata. Animals originate from a cold-water coral degradation zone in the Porcupine Seabight area (North-East Atlantic Ocean). Akanthepsilonema sinecornibus sp. n. differs from A. heUeouetae in number of body annules, sexual dimorphism in amphid size, absence of copulatory thorns in males, absence of large spines and horns, shape of the copulatory apparatus, and position of ambulatory setae relative to vulva in females. The genus diagnosis for Akanthepsilonema is adjusted to incorporate the new species. Akanthepsilonema mainly differs from every other genus in the family by the combination of six rows of ambulatory setae situated around the vulva in females and eight subcephalic setae not displaced toward the anterior part of the head capsule. Small differences between the Papua New Guinea and the Porcupine Seabight populations of T. tripapillata indicate minimal intraspecific variability. Second-stage juveniles from Papua New Guinea have two rows of three ambulatory setae, whereas Porcupine Seabight specimens have two rows of four ambulatory setae. First- and fourth-stage juveniles of T. tripapillata are described for the first time. Literature data and personal observations showed that the molting of first-stage juveniles into second-stage juveniles and of third-stage juveniles into fourth-stage juveniles involves a decrease in the number of body rings, resulting in a loss of flexibility which is possibly compensated for by the development (I-II) or the doubling of the number of rows (III-IV) of ambulatory setae. This decrease is also linked with the formation of the head capsule and the smooth tail tip, although intergeneric variability is evident. The molting of second-stage juveniles into third-stage juveniles and of fourth-stage juveniles into adults is also subject to intergeneric variability. The variability in the ... Text North East Atlantic PubMed Central (PMC) Porcupine Seabight ENVELOPE(-13.000,-13.000,50.500,50.500) |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Contributed Paper |
spellingShingle |
Contributed Paper Raes, Maarten Decraemer, Wilfrida Vanreusel, Ann Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
topic_facet |
Contributed Paper |
description |
A new species of Akanthepsilonema and the first-stage juvenile of Glochinema trispinatum are described. Furthermore, additional morphological information is provided for Triepsilonema tripapillata. Animals originate from a cold-water coral degradation zone in the Porcupine Seabight area (North-East Atlantic Ocean). Akanthepsilonema sinecornibus sp. n. differs from A. heUeouetae in number of body annules, sexual dimorphism in amphid size, absence of copulatory thorns in males, absence of large spines and horns, shape of the copulatory apparatus, and position of ambulatory setae relative to vulva in females. The genus diagnosis for Akanthepsilonema is adjusted to incorporate the new species. Akanthepsilonema mainly differs from every other genus in the family by the combination of six rows of ambulatory setae situated around the vulva in females and eight subcephalic setae not displaced toward the anterior part of the head capsule. Small differences between the Papua New Guinea and the Porcupine Seabight populations of T. tripapillata indicate minimal intraspecific variability. Second-stage juveniles from Papua New Guinea have two rows of three ambulatory setae, whereas Porcupine Seabight specimens have two rows of four ambulatory setae. First- and fourth-stage juveniles of T. tripapillata are described for the first time. Literature data and personal observations showed that the molting of first-stage juveniles into second-stage juveniles and of third-stage juveniles into fourth-stage juveniles involves a decrease in the number of body rings, resulting in a loss of flexibility which is possibly compensated for by the development (I-II) or the doubling of the number of rows (III-IV) of ambulatory setae. This decrease is also linked with the formation of the head capsule and the smooth tail tip, although intergeneric variability is evident. The molting of second-stage juveniles into third-stage juveniles and of fourth-stage juveniles into adults is also subject to intergeneric variability. The variability in the ... |
format |
Text |
author |
Raes, Maarten Decraemer, Wilfrida Vanreusel, Ann |
author_facet |
Raes, Maarten Decraemer, Wilfrida Vanreusel, Ann |
author_sort |
Raes, Maarten |
title |
Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
title_short |
Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
title_full |
Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
title_fullStr |
Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
title_full_unstemmed |
Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets |
title_sort |
postembryonic morphology in epsilonematidae, with a discussion on the variability of caudal gland outlets |
publisher |
The Society of Nematologists |
publishDate |
2006 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586427 http://www.ncbi.nlm.nih.gov/pubmed/19259436 |
long_lat |
ENVELOPE(-13.000,-13.000,50.500,50.500) |
geographic |
Porcupine Seabight |
geographic_facet |
Porcupine Seabight |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586427 http://www.ncbi.nlm.nih.gov/pubmed/19259436 |
op_rights |
© The Society of Nematologists 2006 |
_version_ |
1766139172771332096 |