Steinernema yirgalemense n. sp. (Rhabditida: Steinernematidae) from Ethiopia
Abstract Steinernema yirgalemense, a new species based on morphological and molecular data, is described from Yirgalem, Ethiopia. This nematode belongs to the 'bicornutum-group' which includes nematodes with horn-like structures in the labial region of the infective juvenile. The new speci...
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Published in | Nematology : international journal of fundamental and applied nematological research Vol. 6; no. 6; pp. 839 - 856 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
The Netherlands
Brill
2004
BRILL |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
Steinernema yirgalemense, a new species based on morphological and molecular
data, is described from Yirgalem, Ethiopia. This nematode belongs to the
'bicornutum-group' which includes nematodes with horn-like structures in the
labial region of the infective juvenile. The new species can be recognised
by the infective juvenile having a body length of 635 (578–693) μm, distance
from anterior and to excretory pore of 51 (45–59) μm; tail length of 62
(57–67) μm and E% (EP/tail length × 100) of 83 (67–90). The lateral field
pattern is variable from anterior to posterior; the formula for the
arrangement of ridges from head to tail being: 2, 6, 8, 6, 2. The new
species can be further recognised by male characters: spicule with large
velum and tapering posteriorly to a point, the ratio SW (spicule
length/cloacal body diameter) and GS (gubernaculum length/spicule length)
and especially by the presence of 12 pairs of genital papillae plus a single
midventral papilla. The 12th pair, located at the edge of the cloacal
aperture, is an important character. The presence of a low epiptygma is
another diagnostic character of the new species. The new species is a sister
taxon to S. abbasi and is characterised by the sequence length of the ITS
regions (960 bp), ITS1 (270 bp), ITS2 (284 bp) and also by the pairwise
distance of both ITS and D2/D3 regions between species of nematodes in the
'bicornutum-group'. |
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Bibliography: | href:15685411_006_06_s005_text.pdf istex:5172405129D260160E4AB6A0B22E022BBCFDBE3D ark:/67375/JKT-1V679TFC-G |
ISSN: | 1388-5545 1568-5411 1388-5545 |
DOI: | 10.1163/1568541044038605 |