Cactodera solani n. sp. (Nematoda: Heteroderidae), a new species of cyst-forming nematode parasitising tomato in Mexico

Nematology ◽  
2020 ◽  
Vol 23 (1) ◽  
pp. 1-14
Author(s):  
Ilia Mariana Escobar-Avila ◽  
Sergei A. Subbotin ◽  
Alejandro Tovar-Soto
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Mexico City ◽  
Phylogenetic Relationships ◽  
Cyst Nematode ◽  
Gene Sequences ◽  
Second Stage ◽  
Its Rrna ◽  
A New Species

Summary A new species of cyst-forming nematode, Cactodera solani n. sp., from Mexico is described. The new species was found in a glasshouse in Mexico City parasitising tomato and common lambsquarter. This cyst nematode has light brown to almost black cysts, presents a small vulval cone with circumfenestra and morphologically it most resembles C. milleri. Cactodera solani n. sp. can be differentiated from C. milleri by having smaller cysts that are 417 (291-581) × 324 (204-505) vs 632 (515-730) × 506 (419-598) μm in size and a longer stylet in the second-stage juveniles of 25 (24-27) vs 22 (21-23) μm. Phylogenetic relationships within populations and species of Cactodera are given based on the analysis of the ITS rRNA and the partial COI gene sequences. The ITS rRNA and COI gene sequences clearly differentiated C. solani n. sp. from other Cactodera species. This new cyst-forming nematode has several generations per year and its life cycle can be completed in 49 days on tomato and in 40 days on common lambsquarter at 20-25°C.

A new cyst nematode, Cactodera torreyanae sp. n. (Tylenchida: Heteroderidae), parasitising romerito, Suaeda torreyana, in Texcoco, Mexico

Nematology ◽  
2014 ◽  
Vol 16 (2) ◽  
pp. 163-174 ◽  
Author(s):  
Ignacio Cid Del Prado Vera ◽  
Sergei A. Subbotin
Keyword(s):  
New Species ◽  
Phylogenetic Relationships ◽  
Cyst Nematode ◽  
Saline Soils ◽  
Rrna Gene ◽  
28S Rrna ◽  
Cyst Size ◽  
Second Stage ◽  
Its Rrna Gene ◽  
A New Species

A new species of cyst nematode, Cactodera torreyanae sp. n., parasitising romerito plants, Suaeda torreyana (Chenopodiaceae), found in highly saline soils in Texcoco, Mexico, is described. The new species is morphologically and molecularly related to C. weissi, from which it differs in smaller fenestral diam., longer body and shorter tail lengths of second-stage juveniles (J2) and to C. rosae, from which it differs in smaller cyst size, longer body length of J2 and the presence of a smooth eggshell surface. Phylogenetic relationships within populations and species of the Punctoderinae and Cactodera are given based on the analysis of the D2-D3 expansion segments of 28S rRNA and the ITS rRNA gene sequences.

scholarly journals Cactodera chenopodiae (Nematoda: Heteroderidae), a new species of cyst nematode parasitizing common lambsquarter (Chenopodium album) in Liaoning, China

Zootaxa ◽  
2018 ◽  
Vol 4407 (3) ◽  
pp. 361
Author(s):  
YAXING FENG ◽  
DONG WANG ◽  
DONGXUE XIAO ◽  
TIAGO JOSÉ PEREIRA ◽  
YUANHU XUAN ◽  
...  
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Phylogenetic Analyses ◽  
Chenopodium Album ◽  
Morphological Characters ◽  
Cyst Nematode ◽  
Rrna Genes ◽  
Native Vegetation ◽  
Second Stage ◽  
A New Species

A new species of cyst nematode, Cactodera chenopodiae n. sp., parasitizing common lambsquarter, Chenopodium album L., is described from native vegetation in Liaoning, China. Cactodera chenopodiae n. sp. has a circumfenestrate pattern typical of the genus and is morphologically similar to C. cacti Krall & Krall, 1978. However, in the new species, females and cysts show a larger L/W ratio whereas second-stage juveniles (J2s) have a longer hyaline region. The new species is also morphologically similar to C. milleri Graney & Bird, 1990, but the J2s differ by a larger b ratio and longer tail. Based on DNA sequences of the 28S and ITS rRNA, C. chenopodiae n. sp. comes close to C. estonica Krall & Krall, 1978, although it is distinct from the latter with respect to the presence of a punctate eggshell and larger b ratio in the J2s. Although morphometric comparisons with additional Cactodera species show the overlapping of diagnostic morphological characters, our phylogenetic analyses based on both rRNA genes support C. chenopodiae n. sp. as a unique lineage. 

A new species of Chimarra from China (Trichoptera, Philopotamidae) with description of its larva

Zootaxa ◽  
2018 ◽  
Vol 4504 (2) ◽  
pp. 253
Author(s):  
YAN-LI HU ◽  
BEI-XIN WANG ◽  
CHANG-HAI SUN
Keyword(s):  
New Species ◽  
Adult Male ◽  
Anterior Margin ◽  
Zhejiang Province ◽  
Gene Sequences ◽  
A New Species ◽  
Mtcoi Gene

The adult male and larva of a new species in the genus Chimarra Stephens, Chimarra paramonorum n. sp., are described, diagnosed, and illustrated based on the specimens collected in Zhejiang Province, China. The larva and adult male were associated by mtCOI gene sequences. The male can be separated from C. monorum and C. thienemanni mainly by small preanal appendages and by wrinkled, hairless endotheca. The larva of the new species can be separated from other congeners by a combination of characters including the notch on the anterior margin of the frontoclypeus, the teeth of the mandibles, and the length of the seta-bearing process of each forecoxa. The larval description is the first for Chimarra in China. 

scholarly journals Nausithoe aurea n. sp. (Scyphozoa: Coronatae: Nausithoidae), a species with two pathways of reproduction after strobilation: sexual and asexual

1997 ◽  
Vol 66 (4) ◽  
pp. 235-246 ◽  
Author(s):  
Fábio Lang da Silveira ◽  
André Carrara Morandini
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Embryonic Development ◽  
Yellow Pigment ◽  
Early Embryonic Development ◽  
Paulo State ◽  
Polyp Stage ◽  
Submarine Cave ◽  
A New Species ◽  
Medusa Stage

Nausithoe aurea, a new species of scyphozoan Coronatae, is described from São Paulo State, Brazil. The solitary scyphistomae, with some zooxanthellae, strobilated producing planuloids and medusae; this represents an intermediate life cycle between that of metagenetic Nausithoidae and the submarine cave-dwelling, reduced medusa stage of Nausithoe planulophora (Werner, 1971). The periderm tube of the scyphistomae has 16 internal cusps in all whorls. The medusae present yellow pigment spots in most of their lappets. The early embryonic development is briefly described. Planuloid formation is hypothesized as explanation for polyp-stage philopatry.

Morphology and life cycle of a new species ofDidymium(Myxomycetes) from arid areas of Mexico

Mycologia ◽  
2008 ◽  
Vol 100 (6) ◽  
pp. 921-929 ◽  
Author(s):  
D. Wrigley de Basanta ◽  
C. Lado ◽  
A. Estrada-Torres
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Arid Areas ◽  
A New Species
Sign in / Sign up

Export Citation Format

Share Document