1,044 research outputs found
Preface
No full textIt is truly an honour and a pleasure to dedicate this special issue to Professor Jong-Shi
Pang. The idea of the special issue was conceived to honour Jong-Shi on the occasion
of his 60th birthday in 2013 with the area of complementarity problems as a unifying
but not limiting theme, in keeping with his boundless appetite for exploration in the
field of mathematical programming.
We will introduce each of the papers in this special issue and then sketch Jong-Shi’s
journey through the field by giving a few biographical notes and making selective
observations on his research achievements
Eucosma aurilineana Ferris, New, New Species
No full textEucosma aurilineana Ferris, New Species (Figs. 1, 3–5, 8 a) Diagnosis. This species is distinguished from the superficially similar E. ridingsana (Fig. 2 a) by its much larger size (1.2– 2 X) and a forewing pattern lacking an apical transverse line while having 34 oblong distally located spots on the costa. The similarly sized crambitana (Fig. 2 b) lacks costal spots and the diagonal basetoapex gold line of aurilineana. Description. MALES (Figs. 1 a, b). Head: Frons and vertex white with small indistinct patch of golden tan scales anterior of each antennal base; length of labial palpus 2 X diameter of eye, white dorsally with goldentan scales laterally and at tip. Antenna weakly bipectinate, golden tan. Ocellus and chaetosema present. Thorax: Dorsum white with middorsum patch of golden tan scales, patagia and tegulae golden tan. Legs dorsally clothed with golden tan scales and ventrally with creamy white scales. Abdomen: Clothed with whitish scales with occasional light tan dusting, dense longitudinal white scaling of 8 th abdominal segment forming an anal tuft. Forewing: Length, measured along costa from base to apex, 13.0– 17.5 mm (holotype 17.0 mm), mean = 15.9 mm (n = 75); costal fold extending approximately 0.35 forewing length; dorsal ground color lustrous white, with over lying lattice pattern of golden tan (the color of old gold) broad lines and spots, consisting of two longitudinal stripes extending from base to outer margin with lower line rather irregular, upcurved at tornus then tapering toward apex along terminal margin; a diagonal line extending from base below lower longitudinal line across both longitudinal lines to apex, costa with three, small, oblong spots (sometimes conjoined) between apex and midwing, terminal line very thin, dark; fringe lustrous white with just a suggestion of golden tan at scale tips; ventrally brownish fuscous with repetition of costal spots, pale submarginal band, and thin brownish terminal line, fringe scales white with brownish tips (darker than above). Hindwing: Lustrous pale fuscous; fringe with two layers of scales, a lustrous white layer of long scales and an overlying basal layer of short faintly colored golden tan scales; venter fuscous fading to white along margins; wing venation as shown in Fig. 1 d. Genitalia (Fig. 3 a) [4 specimens dissected from Wyoming and California]: Socii well developed and densely setose; valva flat, slightly setose basad; cucullus with coronabearing stout spines; aedoeagus with a central slender cornutus tapering toward tip and 23 sockets indicating shed cornuti. FEMALES (Fig. 1 c). External morphology as in males, but antenna less pubescent. Forewing: Length 13.0– 15.5mm, mean = 14.5 mm (n = 7), costal fold absent; costa with 3 or 4 spots with basal spot sometimes weakly connected to upper longitudinal line; abdominal anal tuft absent. Genitalia (Figs. 3 b–e, 8 a): Ovipositor lobes densely setose, very few setae arising from small papillose bases; posterior apophyses ca 0.55 length of anterior apophysis; ostium bursae constricted at base of lamella postvaginalis, expanding with ductus bursae; ductus seminalis with bursa seminalis; corpus bursae ellipsoidal; anterior signum thornlike, larger posterior signum an open cone with rounded apex (3 specimens dissected from California, Nevada, Wyoming). Holotype: male: WYOMING, Albany Co., 41 ° 17.886 ’N, 105 ° 31.519 ’W, 2285 m, ca. 1.6 km SE of Laramie, 10.ix. 2004, to be deposited in NMNH. Paratypes: 77 ɗ, 5 Ψ. CALIFORNIA, Mono Co., dunes NE of Mono Lake, 23.ix. 1995, R. Robertson (1 ɗ), Tom’s Place, larva vii. 9.1968, eclosed viii. 28.1968, J. A. Powell No. 68 G 11 (1 Ψ). NEVADA, Humboldt Co., dunes 9.7 mi. NW of Winnemucca, 1495 m, 928 64 (28.ix. 1964), C. Henne (2 Ψ). WYOMING, Albany Co., 41 ° 17.886 ’N, 105 ° 31.519 W, 2285 m (all C. D. Ferris), 1.ix. 2001 (1 ɗ), 30.viii– 2.ix. 2002 (10 ɗ), 15.ix. 2003 (1 ɗ); 1.ix. 2004 (2 ɗ), 6–11.ix. 2004 (45 ɗ, 2 Ψ), 13.ix. 2004 (3 ɗ), 17–18.ix. 2004 (2 ɗ); 41 ° 17.820 ’N, 105 ° 31.334 ’W, 2289 m (all J. S. Nordin), 27.viii. 1990 (1 ɗ), 3.ix. 1992 (1 ɗ), 11.ix. 1993 (1 ɗ), 29–31.viii. 1996 (2 ɗ), 31.viii.04 (1 ɗ), 1.ix. 2004 (2 ɗ), 7–10.ix. 2004 (3 ɗ), 18.ix. 2004 (1 ɗ). Additional specimens examined: 7 ɗ, 2 Ψ. ARIZONA, Mohave Co., Rosy Canyon Rd., 0.6 mi. S. Utah line, 22.ix. 2000, G. J. Balogh (1 ɗ). UTAH, Uintah Co., 3 mi. N. of Vernalon [Rd.], 2500 W, 1886 m, 4.ix. 2000, D. J. Wright (5 ɗ, 2 Ψ). WYOMING, Albany Co., 41 ° 17.820 ’N, 105 ° 31.334 ’W, 2289 m, 30.viii. 2002, J. S. Nordin (1 ɗ). Paratypes are currently placed in the collections of the author, J. S. Nordin (Laramie, WY), Essig Museum of Entomology, University of California, Berkeley, CA, University of Wyoming Insect Collection, Laramie, WY, and C. P. Gillette Museum of Arthropods Diversity, Colorado State University, Fort Collins, CO. Etymology. The specific epithet aurilineana is derived from a combination of the Latin words for gold and line, reflecting the maculation of this moth. Biology. An adult female was reared by J. A. Powell from a larva found boring in roots of Ericameria viscidiflora (Hooker) L. C. Anderson (Asteraceae) in Mono Co., CA. This plant does not occur at the type locality, but there is a concentration of the related Gutierrezia sarothrae (Pursh) Britton & Rusby (Asteraceae) that may serve as the larval host. Ericameria viscidiflora does occur some kilometers distant in the same county. The type locality (Fig. 4) is sagebrushsteppe high plains in which the principal vegetation is grasses and forbs with the woody shrubs Gutierrezia sarothrae and two species of Artemisia. Flight period. Based upon specimens examined, adults fly from 27 August to 23 September, depending upon locality and annual weather conditions. Distribution. This species is presently known from sites in five western states as indicated by the solid circles in Fig. 5, but the vast majority of the specimens are from the type locality. Variation. There is little variation other than forewing length and number of costal margin spots, as noted in the description. The color intensity varies to some degree with a few specimens being very pale. Female genitalia of Eucosma crambitana (Figs. 6 a–c, 8 b): Ovipositor lobes strongly setose, setae arising from small papillose bases; posterior apophyses ca. 0.43 length of anterior apophyses; ostium bursae constricted at base of lamella postvaginalis, expanding slightly with ductus bursae; ductus seminalis with small bursa seminalis; corpus bursae ellipsoidal; one thimblelike signum (1 specimen dissected from Albany Co., Wyoming). Female genitalia of Eucosma ridingsana (Figs. 7 a–c, 8 c): Ovipositor lobes moderately setose, setae arising from small papillose bases; posterior apophyses ca. 0.46 length of anterior apophyses; ostium bursae constricted at base of lamella postvaginalis, expanding with ductus bursae; ductus seminalis with large bursa seminalis; corpus bursae nearly spherical; two conical thornlike signa (1 specimen dissected from Albany Co., Wyoming). Comparison of sterigma: Fig. 8 illustrates the sterigma of E. aurilineana, E. crambitana, and E. ridingsana.Published as part of Ferris, Clifford D., 2005, A new species of Eucosma Hübner from the Western United States (Lepidoptera: Tortricidae: Eucosmini)., pp. 1-8 in Zootaxa 806 on pages 2-8, DOI: 10.5281/zenodo.17057
Complementarity Problems in GAMS and the PATH Solver
No full textA fundamental mathematical problem is to find a solution to a
square system of nonlinear equations. There are many methods to
approach this problem, the most famous of which is Newton?s method.
In this paper, we describe a generalization of this problem, the complementarity
problem. We show how such problems are modeled within
the GAMS modeling language and provide details about the PATH
solver, a generalization of Newton?s method, for finding a solution.
While the modeling format is applicable in many disciplines, we draw
the examples in this paper from an economic background. Finally,
some extensions of the modeling format and the solver are described
Passadenoides montanus Ferris 2004, New Species
No full text<i>Passadenoides montanus</i> Ferris, New Species <p>(Figs. 1, 3–6)</p> <p> <b>Diagnosis.</b> The dorsal forewing of <i>montanus</i> (Fig.1) is darker gray than in either <i>donahuei</i> or <i>pullus</i> (Fig. 2), without the brownish cast of the latter. The contrast between the transverse bands and overall wing color is less pronounced than in <i>donahuei</i>, and not so sharp as in <i>pullus</i>. The male genitalic components are closer to <i>donahuei</i> than <i>pullus</i> with regard to the form of the basal process on the valva (Fig. 3) and the three chitinous pieces that comprise the armature of the vesica (Figs. 4–5).</p> <p> <b>Description.</b> MALES (Fig. 1a). <i>Forewing length:</i> 11–14 mm (holotype 13 mm), mean = 13 mm. <i>Head:</i> Frons and vertex with white­tipped medium gray scales; labial palpus laterally covered by white­tipped charcoal gray scales. <i>Thorax:</i> Dorsum and collar clothed with white­tipped medium gray and charcoal gray scales, and a few scattered brownishorange scales. <i>Abdomen:</i> Clothed with mixture of whitish and pale gray and brownish gray scales. <i>Legs:</i> Clothed with mixture of whitish and dark gray to brownish gray scales; femur, tibia, tarsi with alternating pale and dark bands in fresh specimens, faded in worn specimens. <i>Forewing:</i> Basal area generally medium gray with a weak darker basal band; irregular gray antemedial band bordered by thin black border basad and thicker black border distad that is wider at the costa than at inner margin; median area medium gray with the color produced by peppering of charcoal grey and very pale gray scales, with a few brownish­orange scales along the length of costa; crescentic reniform spot composed of black scales and dusting of brownish­orange scales in lower cusp and bordered outwardly by narrow band of white scales, the lower portion of which extends distally beyond the lower cusp producing the illusion of a small somewhat obscure pale horizontally oblong spot; a diffuse dark irregular spot located below the reniform just above the inner margin; pale gray postmedian band bordered by black scales heavily on the basal side and moderately on marginal side; thin black terminal line; fringes composed of whitish­tipped medium gray scales. <i>Hindwing:</i> Translucent pale fuscous with darker marginal shading, wider at apex and tapering to anal angle; very thin dark terminal line; fringe composed of uniform pale fuscous (dirty white) scales. <b>Genitalia</b> (Figs. 3–5) [10 specimens dissected from Wyoming and New Mexico]: Uncus subtriangular with rounded apex; apical process of gnathos a strongly pointed hook curved upward toward uncus; valva with basal process a broad low ridge with large thorn­like spine near costa and a smaller broad triangular process inward (not clearly visible when valva is flattened for photography as in Fig. 3; digitally outlined in inset), valva slightly constricted in area where spine arises; transtilla absent; juxta a broad U­shaped plate with smooth margins; aedoeagus short and stout; vesica armed with large broadly lanceolate cornutus, a smaller scobinate plate, and smaller yet chitinous piece; everted and inflated vesica reveals a scobinate plate resembling a rooster comb arising separately from membrane, with smaller chitinous piece attached near base of large cornutus (Figs. 4–5).</p> <p> FEMALES (Fig. 1b). <i>Forewing length:</i> 11–15 mm, mean = 13 mm. Wing maculation and color, head, thorax, abdomen and leg color as in males. <b>Genitalia</b> (Fig. 6) [3 specimens dissected from different Wyoming localities]: Ostium bursae with broad sclerotized plate; ductus bursae wide with irregularly­shaped scobinate, sclerotized plate originating about midway and extending into corpus bursae, where it is covered with long inwardlydirected spines; corpus bursae outwardly produced at site of a large sclerotized circular plate armed with numerous short, stout, inwardly­directed spines; ductus seminalis very slender, transparent, and originating from the corpus bursae near junction of corpus bursae and the ductus bursae. Location of circular plate on corpus bursae displaced relative to the plate positions in <i>donahuei</i> and <i>pullus</i>.</p> <p> <b>Type material.</b> Holotype male: WYOMING, Albany Co., 41°15.09’N, 105°24.48’W, 2525 m, Sherman Range, ca. 16 km east of Laramie, 14.viii.2002, to be deposited in U.S. National Museum of Natural History, Washington, DC. Paratypes currently deposited in collections of the author, J. S. Nordin (Laramie, WY), the University of Wyoming Insect Collection, Laramie, WY, and C. P. Gillette Museum of Arthropods Diversity, Colorado State University, Ft. Collins, CO.</p> <p> <b>Etymology.</b> The specific epithet <i>montanus</i> is derived from the masculine form of the Latin adjective meaning mountain dweller and reflects the montane habitat of this moth.</p> <p> <b>Biology.</b> Unknown. The habitat (Fig. 7) is moderately dry aspen–coniferous forest at 2290 to 3100 m; all but one specimen from 2440 m and above. Douglas Fir, <i>Pseudotsuga menziesii</i> (Mirbel) Franco, and Ponderosa Pine, <i>Pinus ponderosa</i> Dougl. ex Laws. are common to all of the collection sites. One of these trees may be the larval host.</p> <p> <b>Flight period.</b> Based on the specimens collected to date from 14 July to 6 September, depending upon locality and annual weather conditions.</p> <p> <b>Distribution.</b> Presently known from several areas in the mountainous environs east (Sherman Range) and west (Snowy Range) of Laramie, Wyoming, and from Signal Peak (Pinos Altos Mts.), Grant County, New Mexico.</p> <p> <b>Material examined.</b> 89 male and 28 female specimens (collectors C. D. Ferris = CDF and J. S. Nordin = JSN): WYOMING: Albany Co.: Sherman Range: 41°17.88’N, 105°31.51’W, 2290 m, 15.viii.1999, JSN (1f); 41°15.09’N, 105°24.48’W, 2525 m, 14.viii.2002, CDF (6m incl. HT, 8f); 41°11.569’N, 105°23.509’W, 2516 m, 3.viii.2001, JSN (1m), 8,16. viii.2002, JSN (9m, 1f), 2.ix.2002, JSN (1f), 6.viii.2003, CDF (1m, 1f), JSN (1m), 19.viii.2002, JSN (1m); 41°13.5’N, 105°22.5’W, 2545 m, 5.ix.2003, JSN (1m); 41°15.09’N, 105°24.52’W, 2515 m, 15,24. viii.1999 (2f), 25.viii.2001 (1m), 24.viii.2002 (1m), 21–22.viii.2003 (1m, 1f), 21.viii.2003 (1f), all JSN; Snowy Range: 41°07.4’N, 106°02.5’W, 2440 m, 24.vii.2000, JSN (2f); 41°00.10’N, 106°12.69’W, Pelton Creek Rd., 2670 m, 24.viii.1998 (2m), JSN, 18.viii.2001, JSN (56m, 9f); 41°00.28’N, 106°13.14’W, 2700 m, 21.vii.2004, CDF (4m), 41°04.8’N, 106°09.1’W, 2757 m, 29.viii.1997, JSN (1m); 31.viii.2002, JSN (1m); 41°21.07’N, 106°12.55’W, 3100 m, 14.vii.2000, CDF (1f). NEW MEXICO: Grant Co.: 32°35.64’N, 108°09.98’W, 2450 m (Signal Peak, Pinos Altos Mts.), 6.ix.2002, CDF (2m).</p> <p> <b>Variation.</b> Other than the forewing length as noted in the description, there is little variation. The main variation is in the size and darkness of the forewing basal band and spot just above the inner margin and below the reniform. The two males from New Mexico are somewhat darker in color than the Wyoming specimens, but the genitalia are identical to the Wyoming moths.</p> <p> <b>Discussion.</b> In habitus <i>montanus</i> is similar to <i>pullus</i>, but a darker gray; its male genitalia, however, are closer in appearance to those of <i>donahuei.</i> The spines on the scobinate plate in the vesica of <i>donahuei</i> are randomly scattered, while in <i>montanus</i> they are aligned in two closely­spaced rows producing the aspect of a rooster comb. The small chitinous plate is smooth in <i>montanus</i>, while in <i>donahuei</i> there are several small spines. In all specimens examined, the end of the valva has a distinct curl not seen in <i>donahuei</i> and <i>pullus</i>. Females of <i>donahuei</i> and <i>pullus</i> were not available for genitalic study.</p> <p> The disjunct known geographic distribution of this species (southern Wyoming and southwestern New Mexico) parallels the known distribution of <i>donahuei</i> (eastern California and central New Mexico). One would expect to find colonies in intervening regions at suitable elevation and habitat.</p>Published as part of <i>Ferris, Clifford D., 2004, A new species of Passadenoides Neunzig from Wyoming and New Mexico (Lepidoptera: Pyralidae: Phycitinae), pp. 1-8 in Zootaxa 705 (1)</i> on pages 2-7, DOI: 10.11646/zootaxa.705.1.1, <a href="http://zenodo.org/record/5451777">http://zenodo.org/record/5451777</a>
Case Studies in Complementarity: Improving Model Formulation
No full textOver the past several years, many practitioners have been formulating
nonlinear variational inequalities as mixed complementarity problems
within modeling languages such as GAMS and AMPL. Sometimes the
models generated are poorly specified, either because the function is undefined
near the solution or the problem is ill-conditioned or singular. In
this paper, we look at information provided by the PATH solver about
the model that can be used to identify problem areas and improve formulation.
Descriptions and uses of the data provided are detailed via several
case studies
Modeling Languages and Condor: Metacomputing for Optimization
No full textA generic framework for utilizing the computational resources provided
by a metacomputer to concurrently solve several optimization problems
generated by a modeling language is postulated. A mechanism using the
Condor resource manager and the AMPL and GAMS languages is developed
and applied to a technique for solving a mixed integer programming
formulation of the feature selection problem. Due to the method?s computational
requirements, the ability to perform optimizations in parallel
is necessary in order to obtain results within a reasonable amount of time.
We provide details about our simple and easy to use tool and implementation
so that other modelers with applications generating many independent
mathematical programs can take advantage of it to significantly
reduce duration
Optimization of Gamma Knife Radiosurgery
No full textThe Gamma Knife is a highly specialized treatment unit that pro-
vides an advanced stereotactic approach to the treatment of tumors, vascular
malformations, and pain disorders within the head. Inside a shielded treatment
unit, beams from 201 radioactive sources are focused so that they intersect at
the same location in space, resulting in a spherical region of high dose referred
to as a shot of radiation. The location and width of the shots can be ad-
justed using focussing helmets. By properly combining a set of shots, larger
treatment volumes can be successfully treated with the Gamma Knife.
The goal of this project is to automate the treatment planning process.
For each patient, an optimization seeks to produce a dose distribution that
conforms closely to the treatment volume. The variables in the optimization
can include the number of shots of radiation along with the size, the location,
and the weight assigned to each. Formulation of such problems using a variety
of mathematical programming models is described, and the solution of several
test and real-patient examples is demonstrated
Asymmetric rhodium carbenoid insertion into the Si-H bond.
No full textBuck, Richard T.; Doyle, Michael P.; Drysdale, Martin J.; Ferris, Leigh; Forbes, David C.; Haigh, David; Moody, Christopher J.; Pearson, Neil D.; Zhou, Qi-Lin. Dep. Chemistry, Loughborough Univ., Loughborough, Leicestershire, UK. Tetrahedron Letters (1996), 37(42), 7631-7634. Publisher: Elsevier, CODEN: TELEAY ISSN: 0040-4039. Journal written in English. CAN 125:328854 AN 1996:644681 CAPLUS (Copyright (C) 2009 ACS on SciFinder (R)) Abstract Decompn. of Me 2-diazophenylacetate in the presence of dimethylphenylsilane and a chiral dirhodium(II) catalyst results in Si-H insertion of the intermediate carbenoid to give PhCH(SiMe2Ph)CO2Me with varying degrees of enantioselectivity (up to 47% ee; 47% using (S)-Rh2L4, LH = I)
Tripylina rorkabanarum Prado-Vera, Ferris & Nadler, 2016, n. sp.
No full textTripylina rorkabanarum n. sp. Measurements. Table 2. Tripylina rorkanbanarum n. sp. was collected by the first author from moss on tree bark ecological reserve at the La Mancha Ecological Institute, Veracruz, México in August 2012 and again in August, 2013. Female: (n= 19). Body slender, curved ventrally, posterior end of tail usually bent dorsally after fixation. Cuticle thin (1.0 m) with fine striations. Lip region asymmetric, 7–16 m (12 ± 0.8) wide, continuous with the body contour. Three lips, each with two small labial papillae at the base. Outer labial setae plump and leaf-shaped with wide base and pointed apex. Cephalic setae in a whorl 1–2 Μm behind the outer labial setae. Dorsal wall of stomal chamber thickened more strongly anteriorly (Figs. 7,8). Head asymmetric, conoid, 16–20 Μm wide. Relaxed specimens C-shaped, with tail curved ventrally and bent dorsally at posterior end. Body pores and a few somatic setae present, mainly in the anterior half of the body. Mouth with three small triangular-shaped lips, each with a pair of conical inner labial papillae at its base; outer labial setae longer 8–11 (10 ± 0.33) Μm long or 42–69 % of head width; cephalic setae 5–6 (5.3 ± 0.18) Μm long, in a whorl 1–2 Μm behind the outer labial setae. Amphid apertures almost circular, close to the level of the dorsal tooth 8–17 (11.6 ±1.0) Μm or 0.4 –1.0 (0.6 ± 0.4) times the width of the head from the anterior end; dorsal tooth small, 10–15 (13.6 ± 0.63) Μm from the anterior end and 1–2 Μm anterior to the subventral teeth. Two cervical setae observed, the anterior 72–84 (80 ± 1.5) Μm, and the posterior 108–123 (115 ± 4.4) Μm, from the anterior end. Excretory pore not seen. Pharynx 151–185 (173 ± 3.9) Μm long. Base of pharynx to vulva 424–603 (508 ± 14.7) Μm and 669–867 (770 ± 19.5) Μm to anus. Cardia relatively small, 10–17 (13 ± 0.9) Μm long and 17–28 (23 ± 1.5) Μm wide, with two gland-like bodies. Nerve ring at 70–88 (82 ± 5.8) Μm from the anterior end (Figs. 7,8). Vulva with or without protruding lips and without sclerotized pieces around the vagina. Gonad 104–240 (171 ± 13.8) Μm long or 9.8–23.7 (17 ± 1.3)% of the body length, ovary reflexed. Vulva anus distance 226–311 (263 ± 9.5) Μm. Tail ventrally curved 67–99 (81 ± 2.7) Μm long, 7–9 (8 ± 0.2)% of the body length, with the posterior portion bent dorsally, terminated by a small spinneret 1–2 (1.7 ± 0.1) Μm long. A pair of latero-dorsal setae present posterior to the anus and another pair anterior to the reduction in tail width (Fig. 7, Table 2). Male: Unknown. Type locality and habitat. Black-colored moss growing on bark of a tropical tree at the La Mancha Ecological Institute, Municipio de Actopan, Veracruz State, México, N 19 ° 35 ' 50.3 " W 96 ° 22 ' 36.8 ", 15 m above sea level. Etymology. This new species is named in honor of Dr. Rodrigo Rodriguez Kabana, for his outstanding scientific productivity in Nematology and his great contributions to the Organization of Nematologists of Tropical America (ONTA). Type specimens. Holotype female CNHE 9254 and paratypes CNHE 9253 of Tp. rorkabanarum are deposited in CNHE; paratypes in CNCP (A-082- 2), UCRNC and USDANC. Diagnosis and relationships. Tripylina rorkabanarum n. sp. is characterized by the presence of two cervical setae, the position of the subventral teeth posterior to the dorsal tooth, the absence of sclerotized pieces around the vagina, the thickened dorsal wall of the stomal chamber mainly in the anterior region, the length of the pharynx, 151–185 (173 ± 3.9) Μm, the distance of the dorsal tooth from the anterior end, 10–15 (13.6 ± 0.63) Μm and the presence of a few somatic setae (Figs. 7,8). Tripylina rorkabanarum n. sp. is similar to Tp. montecilloensis Cid del Prado-Vera, Ferris, Nadler & Lamothe- Argumedo, 2012, in body length, position of the vulva, absence of a visible excretory pore, and the presence of two cervical setae. It differs in the position of the dorsal tooth anterior vs. posterior to the subventral teeth, in the distance of the amphid to the anterior end 8.0– 17 vs. 15–26, in the length of the tail 151–185 vs 141–207 Μm, in the length of the outer labial setae 8–11 (10 ± 0.3 vs. 10–15 (13 ± 0.5), in the distance of the dorsal tooth from the anterior end, 10–15 (13.6 ± 0.6) vs. 14–20 (16 ± 0.5) Μm and in the distance vulva-anus 226–311 (263 ± 9.5) vs. 165–302 Μm. Tripylina rorkabanarum n. sp. is also similar to Tp. arenicola (De Man, 1880) Brzeski, 1963 in the size of the body, in the position of vulva and in the posterior position of the subventral teeth relative to the dorsal tooth. It differs in the lack of a visible excretory pore, the length of the tail 67–99 (81 ± 2.7) vs. 48–76 Μm, the length of the outer labial setae 8.0– 11 (10 ± 0.3) vs. 10–14 Μm, and in the indices c and c’= 11–15 (12.6 ± 0.3) and 3–4.5 (3.7 ± 0.2) vs. 13–18.7 and 1.9–2.8, respectively. Tripylina rorkabanarum n. sp. is also similar to Tp. sheri Brzeski, 1963, in the length of the body and in the thickened dorsal wall of the stoma. It differs in the lack of a visible excretory pore, in having two cervical setae, the lack of cuticular thickenings in the vaginal walls, in the position of the subventral teeth posterior to the dorsal tooth, in the length of the tail 67–99 (81 ± 2.7) vs. 46–93 and in the index c 11–14.7 (12.6 ± 0.3) vs. 13–22. Molecular characteristics. Specimens of Tp. rorkabanarum did not yield PCR products to sequence.Published as part of Prado-Vera, Ignacio Cid Del, Ferris, Howard & Nadler, Steven A., 2016, Five new species of the family Trischistomatidae (Nematoda: Enoplida) from North and Central America, with keys to the species of Trischistoma and Tripylina, pp. 173-197 in Zootaxa 4109 (2) on pages 184-187, DOI: 10.11646/zootaxa.4109.2.4, http://zenodo.org/record/25775
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