scholarly journals Two atypical new species of the genus Sectonema Thorne, 1930 (Nematoda, Dorylaimida, Aporcelaimidae) from Vietnam

2016 ◽  
Author(s):  
Thi Anh Duong Nguyen ◽  
Joaquín Abolafia ◽  
Michael Bonkowski ◽  
Reyes Peña-Santiago ◽  
Sergio Álvarez-Ortega
Keyword(s):  
New Species ◽  
Ventral Side ◽  
The Body ◽  
Neck Length ◽  
Natural Habitats ◽  
Body Diameter ◽  
Two New Species ◽  
Atypical Feature ◽  
Nearly Continuous ◽  
Scanning Electron

Two new species of the genus Sectonema from natural habitats of northern Vietnam are studied. This paper includes their descriptions, measurements, line illustrations, and light microscope (LM) and scanning electron microscope (SEM) pictures. Sectonema tropicum sp. nov. is characterized by a 2.56–3.24 mm long body, 19–21 μm broad lip region, odontostyle 20–21 μm long at its ventral side, 730–834 μm long neck, pharyngeal expansion occupying 52–59% of total neck length, uterus a simple tube-like structure 150–242 μm long or 1.2–2.5 times the body diameter, pars refringens vaginae present, V = 48–52, short (31–40 μm, c = 70–91, c’ = 0.5–0.6) and rounded tail, 91–97 μm long spicules, and only one weakly developed ventromedian supplement. Sectonema vietnamense sp. nov. is characterized by its slender (a = 33–49) and 2.71–4.25 mm long body, 14–16 μm broad lip region, odontostyle 8–9 μm long at its ventral side, 716–918 μm long neck, pharyngeal expansion occupying 63–67% of total neck length, uterus simple and 209–242 μm long or 2.5–2.9 times the corresponding body diameter, pars refringens vaginae absent, V = 54, short (34–39 μm, c = 70–115, c’ = 0.6–0.8) and rounded tail, 59–75 μm long spicules, and three or four irregularly spaced ventromedian supplements bearing hiatus. Both species are also characterized by their nearly continuous lip region, an atypical feature in this genus. Molecular analysis of S. tropicum sp. nov. confirms that Sectonema is a natural (monophyletic) taxon, very close to Metaporcelaimus.

The genus Metaporcelaimus Lordello, 1965 (Nematoda, Dorylaimida, Aporcelaimidae) in Ukraine: Description of one known and two new species without hiatus

Zootaxa ◽  
2018 ◽  
Vol 4497 (1) ◽  
pp. 127
Author(s):  
LIUBOMYR KRAINER ◽  
ANDRIJ SUSULOVSKY ◽  
REYES PEÑA-SANTIAGO
Keyword(s):  
New Species ◽  
Neck Length ◽  
Natural Habitats ◽  
Body Diameter ◽  
New Information ◽  
Two New Species

One known (M. romanicus) and two new species of the genus Metaporcelaimus, collected in natural and semi-natural habitats of Ukraine, are described and illustrated. Metaporcelaimus concinnus sp. n. is characterized by its 3.09–4.58 mm long body, lip region 16.5–19.5 µm broad and visibly wider than the adjacent body, odontostyle 17–19 µm long, neck 745–865 µm long, pharyngeal expansion occupying 62–66% of total neck length, uterus tripartite and 3.9–5.7 times the corresponding body diameter, vulva longitudinal (V = 49–53%), tail conical (44–54 µm, c = 67–94, c’ = 1.0–1.3 in females), spicules 79–86 µm long with strongly bifurcate distal end, and 10–14 irregularly spaced ventromedian supplements without hiatus. Metaporcelaimus declivicaudatus sp. n. is characterized by its 2.88–3.66 mm long body, lip region 23–28 µm broad, odontostyle 24–26 µm long, neck 634–788 µm long, pharyngeal expansion occupying 48–56% of total neck length, uterus tripartite and 3.0–3.4 times the corresponding body diameter long, vulva transverse (V = 51–55%), tail conical (45–65 µm, c = 53–63, c’ = 1.0–1.2) with rounded terminus, spicules 102–113 µm long, and 12–14 spaced ventromedian supplements without hiatus. New information about M. romanicus is also provided, confirming available data about this species. 

Morphological and molecular characterization of two new species of the genus Aporcelinus Andrássy, 2009 (Nematoda, Dorylaimida, Aporcelaimidae) from the USA, with new insights on the phylogeny of the genus

2018 ◽  
Vol 94 ◽  
Author(s):  
S. Álvarez-Ortega ◽  
S.A. Subbotin ◽  
R. Peña-Santiago
Keyword(s):  
New Species ◽  
Ventral Side ◽  
28S Rrna ◽  
Neck Length ◽  
Female Tail ◽  
Body Diameter ◽  
Two New Species ◽  
Close Relationship ◽  
The Usa

Abstract Two new species of the genus Aporcelinus from the USA are described and illustrated. Aporcelinus floridensis sp. n. is characterized by its 1.12–1.52 mm long body, lip region offset by marked constriction and 14.5–17.0 μm broad with perioral liplets, odontostyle 16.5–20.0 μm at its ventral side and 1.1–1.2 times the lip region diameter, neck 316–395 μm long, pharyngeal expansion occupying 43–48% of total neck length, uterus simple and 33–56 μm long or 0.8–1.2 times the corresponding body diameter, V = 48–54, female tail conical (36–49 μm long, c = 27–41, c’ = 1.2–2.0) with finely rounded terminus and no hyaline portion, and male absent. Aporcelinus paolae sp. n. is characterized by its 1.29–1.80 mm long body, lip region offset by marked constriction and 14–16 μm broad, odontostyle 15–17 μm at its ventral side and 1.0–1.1 times the lip region diameter, neck 314–397 μm long, pharyngeal expansion occupying 43–53% of total neck length, uterus tripartite and 128–164 μm long or 2.6–3.6 times the corresponding body diameter, V = 53–57, female tail conical (30–39 μm long, c = 40–51, c’ = 1.1–1.3) with finely rounded terminus and variably re-curved dorsad, male tail conical (27–36 μm, c = 39–59, c’ = 0.9–1.2), ventrally straight and dorsally convex, spicules 48–54 μm long, and 7–9 irregularly spaced ventromedian supplements lacking hiatus. The analyses of the D2-D3 expansion segments of 28S rRNA (LSU) gene sequences of the two new species confirmed the monophyly of the genus, based upon currently available data, showing a close relationship between the genera Aporcelinus and Makatinus, and justified the placement of Aporcelaimellus, Makatinus and Aporcelinus under the subfamily Aporcelaimellinae.

Three new species of Sectonema Thorne, 1930 (Dorylaimida: Aporcelaimidae) from Vietnam

Nematology ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 517-536 ◽  
Author(s):  
Sergio Álvarez-Ortega ◽  
Thi Anh Duong Nguyen ◽  
Joaquín Abolafia ◽  
Thi Thanh Tam Vu ◽  
Michael Bonkowski ◽  
...  
Keyword(s):  
New Species ◽  
Phylogenetic Relationship ◽  
Ventral Side ◽  
Molecular Data ◽  
Evolutionary Tree ◽  
Neck Length ◽  
Natural Habitats ◽  
Line Drawings ◽  
Close Phylogenetic Relationship ◽  
Three New Species

Three new species of the genus Sectonema collected from natural habitats in Vietnam are studied, described and illustrated, including line drawings, LM and/or SEM pictures. Sectonema birrucephalum sp. n. is characterised by its 2.73-4.35 mm long body, lip region 18-20 μm broad and offset by deep constriction, odontostyle 10.0-11.5 μm long on its ventral side, 659-989 μm long neck, pharyngeal expansion occupying 63-68% of total neck length, uterus a simple tube, 221-277 μm long, pars refringens vaginae present, V = 54-56, tail short (31-43 μm, c = 85-111, c′ = 0.6-0.8) and rounded, spicules 72-75 μm long, and four or five irregularly spaced ventromedian supplements beyond the range of the spicules. Sectonema buccociliatum sp. n. is distinguished by its 2.00-2.46 mm long body, lip region offset by constriction, 19-20 μm broad and bearing perioral cilia-like structures, odontostyle 13-14 μm long at its ventral side, 530-625 μm long neck, pharyngeal expansion occupying 62-69% of total neck length, uterus a simple tube, 116-152 μm long, pars refringens vaginae present, V = 56-62, tail short (23-31 μm, c = 72-104, c′ = 0.6-0.8) and rounded, spicules 56-68 μm long, and 3-5 spaced and weakly developed ventromedian supplements beyond the range of the spicules. Sectonema ciliatum sp. n. is characterised by its 2.79-3.13 mm long body, lip region offset by constriction, 21-22 μm broad and bearing perioral cilia-like structures, odontostyle 14-15 μm long at its ventral side, 699-722 μm long neck, pharyngeal expansion occupying 60% of total neck length, uterus a simple tube, 201-244 μm long, pars refringens vaginae present, V = 52-53, tail short (33-35 μm, c = 82-92, c′ = 0.6-0.7) and rounded, spicules 70-72 μm long, and three or four spaced and weakly developed ventromedian supplements beyond the range of the spicules. Molecular data obtained for S. ciliatum sp. n. and the derived evolutionary tree show a close phylogenetic relationship with other species of the genus.

A new species of the genus Aporcelinus Andrássy, 2009 (Nematoda, Dorylaimida, Aporcelaimidae) from Costa Rica

Zootaxa ◽  
2018 ◽  
Vol 4450 (4) ◽  
pp. 489 ◽  
Author(s):  
INGRID VARELA-BENAVIDES ◽  
REYES PEÑA-SANTIAGO
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Neck Length ◽  
Natural Habitats ◽  
Body Diameter ◽  
A New Species

A new species of the genus Aporcelinus, A. elongicaudatus sp. n., collected from natural habitats of Costa Rica, is described and illustrated. The new species is characterized by its 0.92–1.05 mm long body, lip region offset by weak constriction and 15 µm broad, odontostyle 15–18 µm or 1.0–1.2 times the lip region diameter, neck 270–300 µm long, pharyngeal expansion 130–150 µm long or 45–55% of total neck length, uterus 33–41 µm long or 0.70–0.85 times the corresponding body diameter (but certainly longer), vulva transverse (V = 49–51), and tail conical elongated (45–71 µm, c = 14–22, c’ = 2.0–3.2) and dorsad bent. 

Nematodes of the order Dorylaimida from Andalucía Oriental, Spain: Discolaimus Cobb, 1913. 1. Description of two new species

Nematology ◽  
2002 ◽  
Vol 4 (3) ◽  
pp. 361-369
Author(s):  
Baltasar Torres ◽  
Joaquín Abolafia ◽  
Reyes Peña-Santiago ◽  
Gracia Liébanas
Keyword(s):  
New Species ◽  
Genital System ◽  
Neck Length ◽  
Large Size ◽  
Female Tail ◽  
Two New Species ◽  
Female Genital System ◽  
Labial Disc ◽  
Scanning Electron ◽  
Female Genital

AbstractTwo new species of the genus Discolaimus Cobb, 1913 are described from southeastern Spain. D. mariae sp. n. is distinguished by its large size (L = 2.4-3.3 mm), lip region diameter 29-35 μm, odontostyle 23-25 μm, pharyngeal expansion occupying two-thirds of the total neck length, presence of dorsal cell bodies close to cardia, V = 46-53, female genital system didelphicamphidelphic, tail conical with rounded terminus (33-39 μm, c = 72-88, c′ = 0.9-1.0) and with a terminal gap in the inner cuticle, and males absent. D. labiatus sp. n. is characterised by being medium sized (L = 0.99-1.20 mm), lip region diameter 14-17 μm wide, labial disc with no radial but six longitudinal grooves, inner (perioral) labial portion forming well developed liplets, odontostyle 10.0-12.5 μm, vulva relatively anterior (V = 39-43), female tail conical with rounded terminus (26-27 μm, c = 37-46, c′ = 1.5-1.7), and male unknown. Scanning electron microscope observations of the species are also presented.

Description of Crassolabium costaricense sp. n. (Nematoda: Dorylaimida: Dorylaimidae) from Costa Rica

Nematology ◽  
2018 ◽  
Vol 20 (10) ◽  
pp. 1007-1014 ◽  
Author(s):  
Ingrid Varela-Benavides ◽  
Reyes Peña-Santiago
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Body Length ◽  
Evolutionary Relationship ◽  
Neck Length ◽  
Natural Habitats ◽  
Nearly Continuous ◽  
A New Species

Summary A new species of Crassolabium, C. costaricense sp. n., collected from natural habitats in Costa Rica, is described and illustrated. The new species is characterised by its body length of 1.26 (1.22-1.30) mm in the female and 1.28 (1.16-1.37) mm in the male, lip region nearly continuous and 13.5 (12.5-14.5) μm broad in the female and 13.1 (12.5-14.0) μm broad in the male, odontostyle 17.3 (15.5-19.0) μm long in the female and 18.1 (17.0-19.0) μm long in the male with the aperture occupying 33-42% its length, neck 302-334 μm long, pharyngeal expansion 120-142 μm long or occupying 40-45% of total neck length, uterus tripartite and 163 (134-176) μm long or 2.6-3.1 times the corresponding body diam., pars refringens vaginae well developed, vulva transverse (V = 57.1 (56.0-58.0)), tail short and rounded in female (17.9 (17.0-19.0 μm) long; c = 70.3 (67.0-72.0); c′ = 0.56 (0.50-0.60)) and more conoid in males (21.6 (17.0-23.0) μm long; c = 60.4 (56.0-77.0); c′ = 0.65 (0.50-0.70)), spicules 47 (44-49) μm long, and presence of 8-10 closely spaced ventromedian supplements with an hiatus. Its molecular (LSU D2-D3) characterisation supports an evolutionary relationship with members of the Dorylaimidae.

scholarly journals Two new species of philometrid nematodes (Philometridae), Barracudia notabilis n. sp. and Philometra consimilis n. sp., from the ovary of the hound needlefish Tylosurus crocodilus (Belonidae) off Florida, USA

2021 ◽  
Vol 58 (3) ◽  
pp. 271-280
Author(s):  
F. Moravec ◽  
M. D. Bakenhaster
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Body Length ◽  
Atlantic Coast ◽  
The Body ◽  
Unique Structure ◽  
Two New Species ◽  
Electron Microscopical ◽  
Gravid Females ◽  
Scanning Electron

Summary Two new species of philometrid nematodes (Philometridae), Barracudia notabilis n. sp. and Philometra consimilis n. sp., are described from males found in the ovary of the hound needlefish Tylosurus crocodilus (Péron et Lesueur) (Belonidae) from off the Atlantic coast of Florida, USA. Both species are described and illustrated based on light and scanning electron microscopical examinations. Barracudia notabilis n. sp., the first representative of this genus from fishes in the Atlantic Ocean, can be differentiated from other congeners by the body length of the male (2.69 mm), the length of the gubernaculum (57 μm) and spicules (81 μm), and by the shape of the gubernaculum. Philometra consimilis n. sp. differs from all congeners mainly in the unique structure of the distal tip of the gubernaculum (bearing two smooth dorsal barbs) and the species is also characterized by the length of spicules (111 μm) and the length of the gubernaculum (84 μm). Further studies are needed to discover and describe so far unknown gravid females of Barracudia spp.

Morphology of Labronemella major n. sp. (Nematoda: Dorylaimida), a soil-dwelling nematode from China, including a revised key to species of the genus

2016 ◽  
Vol 91 (1) ◽  
pp. 80-86 ◽  
Author(s):  
W.J. Wu ◽  
L. Yan ◽  
H. Xie ◽  
C.L. Xu ◽  
K. Wang ◽  
...  
Keyword(s):  
New Species ◽  
Body Length ◽  
Body Surface ◽  
The Body ◽  
Scanning Electron Micrographs ◽  
Key To Species ◽  
Neck Length ◽  
Qinghai Province ◽  
One New Species ◽  
Scanning Electron

AbstractOne new species from Qinghai Province, China, Labronemella major n. sp., is described. The new species is characterized by a body length of 3.03–3.34 mm; lip region wide, offset by a distinct depression, disc-like with six separated inner liplets; amphid fovea funnel-shaped, distinctly bulged on body surface in scanning electron micrographs; odontostyle long (35–39 μm) with distinct lumen, aperture about 39–47% of its length; odontophore rod-like and long; guiding ring double; pharyngeal basal expansion about half of the total neck length; uterus relatively long and tripartite; vulva transverse and sclerotized; spicules 81–90 μm long; ventromedial supplements 19–23; tail short, rounded to conoid. It can be differentiated from all other species of the genus by its relatively longer body, odontostyle and spicules, and wider lip region. Due to the lip region being offset by a deep constriction, and the long (three or more times the body diameter at mid-body) tripartite uterus, the new species is close to Labronemella czernowitzensis (Micoletzky, 1922) Andrássy, 2002 and Labronemella labiata Andrássy, 1985. An improved key to the genus including the new species is provided.

Composition of the genus Loricella (Mollusca: Polyplacophora: Loricidae) and the description of two new species

Zootaxa ◽  
2021 ◽  
Vol 4981 (2) ◽  
pp. 275-300
Author(s):  
BORIS SIRENKO
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Central Area ◽  
Dorsal Side ◽  
Morphological Features ◽  
Related Genus ◽  
Mouth Region ◽  
Two New Species ◽  
Scanning Electron

The genus chiton Loricella is revised. It comprises nine species. Two of these species, L. neoguinensis n. sp. and L. solomonensis n. sp., are described as new. Based on the analysis of morphological features studied using a scanning electron microscope, a revised diagnosis of the genus is provided. The characters diagnostic for this that distinguish it from the related genus Squamophora are as follows: a tubular hollow inside the dorsal scales, bristles on the dorsal side of the girdle, a wide ventral mouth region, a narrow mantle fold covered with simple longitudinally ribbed scales, smooth ventral scales, pits arranged in longitudinal rows in the central area of the tegmentum, and a bicuspid head of the major lateral teeth of the radula. 

A new species of the genus Eudorylaimus Andrássy, 1959 (Nematoda: (Dorylaimida: Qudsianematidae) associated with Picea crassifolia in China

Zootaxa ◽  
2018 ◽  
Vol 4526 (4) ◽  
pp. 576
Author(s):  
WEN-JIA WU ◽  
CHUN-LING XU ◽  
DONG-WEI WANG ◽  
HUI XIE
Keyword(s):  
New Species ◽  
Rhizosphere Soil ◽  
Phylogenetic Analyses ◽  
Small Subunit ◽  
Neck Length ◽  
Picea Crassifolia ◽  
Body Diameter ◽  
Small Subunit Rdna ◽  
C Value ◽  
A New Species

A new species, Eudorylaimus piceae n. sp., extracted from rhizosphere soil of Picea crassifolia from Inner Mongolia, China was identified. The new species is characterized by these combined characters: body length of 1.03–1.27 mm; lip region distinctly offset; odontostyle 20–22 μm and 1.1–1.4 times the lip region diameter in length; odontophore 1.1–1.2 times the odontostyle length; basal expansion of pharynx occupying 42%–50.5% of the total neck length; genital system didelphic-amphidelphic; vulva transverse; vagina extending inwards 32%–43%; V value averaging more than 60; pars refringens vaginae with two trapezoidal sclerotizations and pars distalis vaginae weakly sclerotized; prerectum 72–107 μm long, 2.3–3.3 times the anal body diameter, and rectum 1–1.6 times the anal body diameter in length; tail conoid and bent ventrally, c’ value 1.5–1.8 and males unknown. Phylogenetic analyses based on sequences of 18S small subunit rDNA and the D2-D3 expansion region of 28S rDNA are presented. 

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