El presente estudio se basa en la diversidad específica de mermítidos parasitoides de larvas de dípteros acuáticos simúlidos, culícidos y quironómidos, y su prevalencia en las diferentes regiones de Argentina. Se proporciona una lista de nemátodos pertenecientes a la familia Mermithidae parasitoides de varias especies de simúlidos y quironómidos (Diptera: Simuliidae, Chironomidae) en arroyos de aguas claras, oxigenadas y de mucha corriente. Se identificaron en las larvas de jejenes 21 especies de mermítidos correspondientes a ocho géneros, de los cuales 1 (Ditremamermis Camino y Poinar, 1988) es propio de Argentina. La región neotropical constituye un área con alta diversidad de especies de nemátodos mermítidos de simúlidos, muchas de las cuales podrían ser consideradas agentes biorreguladores de esta plaga de interés sanitario. Los mermítidos se presentan en los quir...

This work was carried out between 2006-2010 in wheat fields of the Pampas, Argentina, in order to examine the species of nematode parasites and pathogens of white grubs, soil major pest. Samples were taken with shovel in randomly selected sites. Nymphs of Diloboderus abderus and Cyclocephalla signaticollis (Scarabaeidae) were collected. Thirteen species of nematodes belonging to 5 families (Mermithidae, Thelastomatidae, Travassosinematidae, Diplogasteridae and Rhabditidae) were identified. The richness of species values were 1 for Cyclocephalla signaticollis and 12 for Diloboderus abderus. The thelastomatids and rhabdítids were the largest group of nematodes, with a total of 3 species each. The thelastomatids were very prevalent with infections exceeding 60%, followed by diplogasterids which reached 36%. The mermithids were less prevalent with values close to 10%. The family Travassosin...

Hammerschmidtiella laplatae n. sp. (Nematoda, Thelastomatidae), a parasite of Periplaneta americana (L.) (Blattodea, Blattidae) from La Plata, Argentina, is described and illustrated. It is characterized by a striated cuticle with lateral alae, mouth with three triangular inner papillae, and eight labial papillae; small, pore-shaped amphids; short and wide buccal capsule with dental plates; an esophagus with a valvate metacorpus; a thin, cylindrical isthmus surrounded by the nerve ring; and a rounded basal bulb heavily muscled and valvate. The vulva is slightly protuberant and lies in the anterior third of the body. The female is didelphic and prodelphic. Small eggs, elongate, and triangular in cross-section. The male has one spicule, without gubernaculum; the genital papillae consist in one preanal and three postanal pairs, with the last pair being fingershaped. In the female the tail a...

The study of nematodes of the American cockroach Periplaneta americana (L.) lies in the need to find some pathogen to control it. This insect contaminates food and carries bacteria, protozoa and viruses. Cockroach droppings contain a number of allergens that cause some people to have skin rashes, watery eyes, nasal congestion and asthma. The aim of this study was to record the nematode fauna in P. americana in Argentina. Nymphs of P. americana (n = 80) were collected from an abandoned house in the north of the city of La Plata (34 º 55'S and 57 º 57'W), Buenos Aires, Argentina during the springsummer 2010-2011. Cockroaches were collected by trap capture. The insects were dissected in Petri dishes with distilled water under a stereomicroscope. Half the nematodes found in the digestive tract were killed by placing them in distilled water at 60 ° C for two min, then placed in the solutio...

The discovery of nematodes in spiders and scorpions from a manual sampling in the city of La Plata, Argentina, revealed the presence of specimens of the order Rhabditda. The main objective of this study is to present the presence of nematodes in the arachnid group, for which there is little precedent. One of the nematodes found belongs to the genus Rhabditis Dujardin, 1845, of saprophytic character, characterized by carrying a fungus that kills the host and degrades it in order to feed itself. This was found in the general cavity of the body of the spider Dysdera crocata Koch, 1838. It is characterized by having a thin cuticle, closed labial papillae, a long stoma without teeth, an esophagus with a middle bulb with a valve and a valved basal bulb, and a middle vulva, short and conical caudal appendage. Mitotic division is described and information about the morphology of chromosomes is p...

Blatticola chydaeus n. sp. (Nematoda, Thelastomatidae), parasitizing Anurogryllus muticus (De Geer, 1773) (Orthoptera, Gryllidae) in Argentina is morphometric and cytognetic described. It characterized by the female with cuticle annulated up to the middle of the body, the mouth surrounded by eight cephalic papillae, the stoma short with two plates and one tooth, the amphid pore shaped, the oesophagus divided into three parts, anterior cylindrical corpus, isthmus distinct, and basal bulb valvated, the excretory pore located posterior to basal bulb, the nerve ring situated at the beginning of the esophagic isthmus, the intestine broadest anteriorly, the egg oval, smooth shell, in apical view show a triangular section. The tail appendage is short and conic, and presents anal alae. The vulva is protruding, the vagina is long and posterior. The male has one preanal papilla, one simple papilla...

For the first time in Argentina, we report that in Harmonia axyridis Pallas, 1773, and Cycloneda sanguinea (Linnaeus, 1763) (Coleoptera, Coccinellidae) parasitizing by nematodes which belong to the family of Allantonematidae (Nematoda, Tylenchida). The genera are Metaparasitylenchus Wachek, 1955 (Nickle, 1967), Sulphuretylenchus Rühm, 1956 (Nickle, 1967) and Contortylenchus Rühm, 1956. They will be described and photographied afterwards.

Parasitylenchus pseusobifurcatus sp.n. ( Tylenchida, Allantonematidae) is described for the first time for Argentina as a parasite of adults of Harmonia axyridis (Pallas, 1773) (Coleopera, Coccinellidae). The new species is closed to P. bifurcatus Poinar Jr. & Steenberg, 2012, by the characteristic of having the tail tip of all vermiform females and immature males bifurcated, but they differ by the size of the gubernaculum. Its karyotype formula is described. Publicación registrada en Zoobank:LSIDurn:lsid:zoobank.org:pub:751C7C95-EDD7-4D3F-80FA-0BBC5339E404 Acto nomenclatural:LSIDurn:lsid:zoobank.org:act:31912097-A9DF-47C5-9294-2E9DEA879AED

For the first time in Argentina, we report that in Harmonia axyridis Pallas, 1773, and Cycloneda sanguinea (Linnaeus, 1763) (Coleoptera, Coccinellidae) parasitizing by nematodes which belong to the family of Allantonematidae (Nematoda, Tylenchida). The genera are Metaparasitylenchus Wachek, 1955 (Nickle, 1967), Sulphuretylenchus Rühm, 1956 (Nickle, 1967) and Contortylenchus Rühm, 1956. They will be described and photographied afterwards.

Se cita y describe por primera vez para Argentina Parasitylenchus pseusobifurcatus sp.n. (Tylenchida, Allantonematidae), parásito de adultos de Harmonia axyridis (Pallas, 1773) (Coleopera, Coccinellidae). Esta nueva especie está muy cercana a P. bifurcatus Poinar Jr. y Steenberg, 2012, por la característica de tener todas las hembras vermiformes y los machos inmaduros la punta del apéndice caudal bifurcada, pero se diferencian entre otros por el tamaño del gubernáculo. Se describe su fórmula cariotípica. Publicación registrada en Zoobank:LSIDurn:lsid:zoobank.org:pub:751C7C95-EDD7-4D3F-80FA-0BBC5339E404 Acto nomenclatural:LSIDurn:lsid:zoobank.org:act:31912097-A9DF-47C5-9294-2E9DEA879AED

Protylenchus bonaerensis n. sp. (Tylenchida, Allantonematidae) was found in the Horticultural Belt of Gran La Plata, Argentina. This genus is reported for the first time in our country and a new species is described parasitizing adults of Harmonia axyridis (Pallas, 1773) (Coleoptera, Coccinellidae). This new species is mainly characterized by the males having a thin bursa, females with a non-protuberant vulva, and a short and thin caudal appendage in both sexes. In addition, the life cycle is described.  

Steinernema riobravis Cabanillas, Poinar & Raulston, 1994, Thermo Trilogy strain (Nematoda, Steinernematidae) was the nematode species used for application to small-scale field against Neocurtilla claraziana (Saussure, 1874) (Orthoptera, Gryllotalpidae), a pest of soil in three gardens of Gran La Plata, Argentina. Assays were performed with dosages of 6,000, 10,000, 20,000, 40,000 and 80,000 nematodes per 3 m2, with a density of 32 ± 7 mole crickets/3 m2. The application was performed with hand sprayer. The percentages of effectiveness varied in different gardens, the first lower dose was 65% ± 15.67 and the highest dose was 83% ± 22.25, with ± 80% being the average dose 18.56. For the second garden 50% ± 8.31 for the low dose and 76% ± 21.15 for medium and higher, and for the third garden the lower dose was 42 ± 15.87%, the highest dose of 66% ± 18.32 and the mean dose of 60...

Hexamermis bonaerensis sp. n. a parasite of Epilachna paenulata (Germar, 1824) (Coleoptera, Coccinellidae) from Argentina is described. It is characterized by having the amphids medium sized, rounded oval shaped, the vagina muscularized and slightly protruding with a descending branch forming a loop before joining the uterus. It presents three rows of genital papillae: the ventrolateral in one row with thirteen papillae; the ventral row with two single, three pairs and two single preanal papillae, and with five pairs postanal papillae. Publicación registrada en Zoobank:LSIDurn:lsid:zoobank.org:pub:9F5EA90D-381D-4FC8-8F0F-86B9E1D2F014 Acto nomenclatural:LSIDurn:lsid:zoobank.org:act:35252E81-2E50-4F12-94DF-FC3617971627

Hexamermis bonaerensis sp. n. a parasite of Epilachna paenulata (Germar, 1824) (Coleoptera, Coccinellidae) from Argentina is described. It is characterized by having the amphids medium sized, rounded oval shaped, the vagina muscularized and slightly protruding with a descending branch forming a loop before joining the uterus. It presents three rows of genital papillae: the ventrolateral in one row with thirteen papillae; the ventral row with two single, three pairs and two single preanal papillae, and with five pairs postanal papillae. Publicación registrada en Zoobank:LSIDurn:lsid:zoobank.org:pub:9F5EA90D-381D-4FC8-8F0F-86B9E1D2F014 Acto nomenclatural:LSIDurn:lsid:zoobank.org:act:35252E81-2E50-4F12-94DF-FC3617971627