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NameM. RAES, W. DECRAEMER, AND A. VANREUSEL (2006). Postembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets Journal of Nematology
AuthorsM. RAES, W. DECRAEMER, AND A. VANREUSEL
Year2006
TitlePostembryonic Morphology in Epsilonematidae, with a Discussion on the Variability of Caudal Gland Outlets
JournalJournal of Nematology
Type Publication
NoteNeMys doc_id: 17870
Full textAvailable for editors  PDF available
AbstractA 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. helleouetae 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 number and orientation of caudal gland outlets among different nematode taxa is discussed. The presence of separate outlets for the caudal glands seems to be widespread within the family Epsilonematidae and has also been observed in various other, unrelated taxa of free-living aquatic nematodes, although their arrangement in Epsilonematidae is opposite. This aberrant arrangement is probably related to the aberrant locomotory pattern in this family.
Taxa
(11)
Checked: verified by a taxonomic editorDeontolaimus papillatus de Man, 1880 (taxonomy source)
Checked: verified by a taxonomic editorDesmodora schulzi Gerlach, 1950 accepted as Checked: verified by a taxonomic editorDesmodora (Desmodorella) schulzi (Gerlach, 1950) (taxonomy source)
Checked: verified by a taxonomic editorEchinotheristus teutonicus Thun & Riemann, 1967 (taxonomy source)
Unreviewed: has not been verified by a taxonomic editorEpsilonema Steiner, 1927 (taxonomy source)
Checked: verified by a taxonomic editorEpsilonema pustulatum (Gerlach, 1952) (taxonomy source)
Unreviewed: has not been verified by a taxonomic editorEpsilonematidae Steiner, 1927 (taxonomy source)
Unreviewed: has not been verified by a taxonomic editorIxonema Lorenzen, 1971 (taxonomy source)
Unreviewed: has not been verified by a taxonomic editorMetepsilonema Steiner, 1927 (taxonomy source)
Checked: verified by a taxonomic editorPararaeolaimus nudus (Gerlach, 1951) (taxonomy source)
Unreviewed: has not been verified by a taxonomic editorPerepsilonema Lorenzen, 1973 (taxonomy source)
Checked: verified by a taxonomic editorSphaerolaimus gracilis de Man, 1876 (taxonomy source)
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2014-06-18 16:05:08Z  created  Vanaverbeke, Jan
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