Description of Pudica wandiquei n. sp. (Heligmonellidae: Pudicinae), a nematode found infecting Proechimys simonsi (Rodentia: Echimyidae) in the Brazilian Amazon

A new species of nematode parasite of the subfamily Pudicinae (Heligmosomoidea: Heligmonellidae) is described from the small intestine of Proechimys simonsi (Rodentia: Echimyidae) from the locality of Nova Cintra in the municpality of Rodrigues Alves, Acre state, Brazil. The genus Pudica includes 15 species parasites of Neotropical rodents of the families Caviidae, Ctenomyidae, Dasyproctidae, Echimyidae, Erethizontidae, and Myocastoridae. Four species of this nematode were found parasitizing three different species rodents of the genus Proechimys in the Amazon biome. Pudica wandiquei n. sp. can be differentiated from all other Pudica species by the distance between the ends of rays 6 and 8 and the 1-3-1 pattern of the caudal bursa in both lobes.

New species of Hassalstrongylus (Trichostrongyloidea: Heligmonellidae) in the large-headed rice rat Hylaeamys seuanezi, in the Atlantic Forest of northeast Brazil

A new species of Trichostrongyloidea (Nematoda: Heligmonellidae), Hassalstrongylus lauroi n. sp., is described from specimens collected from the small intestine of the rodent Hylaeamys seuanezi in the Atlantic Forest of northeastern Brazil (Igrapiúna, state of Bahia). The genus Hassalstrongylus includes 17 species, which parasitize rodents occurring in the Neotropical and Nearctic regions. It differs from the genus Stilestrongylus through its smaller number of ridges in the synlophe and through the size of the genital cone. The main taxonomic characteristics of this new species are the subsymmetrical caudal bursa of type 2-2-1, ray 8 branching out at the base of the dorsal trunk, right lobe smaller than the left, and rays 4 and 5 of robust nature. In addition, the ornamental ray 5 and the robustness of ray 4 on the male caudal bursa, along with the modification of the ridges of the posterior end of the female, allow us to consider the specimens found to be a new species.

On two genera of spiny Pudicinae (Nematoda: Trichostrongylina) parasites of the spiny rat Proechimys simonsi (Mammalia: Echimyidae) from Peru

A new species of trichostrongyloid nematode, Acanthostrongylus secundus is described. It differs from the other species of the genus in the structure of the caudal bursa. Squamasnema amazonica is redescribed correcting the synlophe structure and moving the genus from Heligmonellinae to Pudicinae. Both species were collected in Proechimys simonsi from Peru. [Zoobank URL: urn:lsid:zoobank.org:act:EEDBD925-8539-4F5D-A276-4F735464BA6F]

A new heligmonellid (Nematoda) species of the genus Stilestrongylus in Euryoryzomys russatus (Rodentia: Sigmodontinae) in the Atlantic Forest, southern Brazil

A new species of Nippostrongylinae (Nematoda: Heligmonellidae), Stilestrongylus rolandoi n. sp., is described from specimens collected from the small intestine of the rodent Euryoryzomys russatus in the Atlantic Forest (Santo Amaro da Imperatriz, Santa Catarina state, southern Brazil). The genus Stilestrongylus includes 23 species, which parasitize rodents occurring in the Neotropical region. Stilestrongylus aureus (Durette-Desset & Sutton, 1985) from Argentina, S. azarai (Durette-Desset & Sutton, 1985) from Argentina, S. flavescens (Sutton & Durette-Desset, 1991) from Uruguay, S. franciscanus (Digiani & Durette-Desset, 2002) from Argentina, S. gracielae (Digiani & Durette-Desset, 2006) from Argentina, and S. oryzomysi (Sutton & Durette-Desset, 1991) from Argentina are closely related to Stilestrongylus rolandoi n. sp., all having caudal bursa patterns of types 1–4 in one of the lobes. Stilestrongylus rolandoi n. sp. is distinguished from the aforementioned species by its ray 6 being short in relation to rays 4 and 5, which are long and robust, and by having caudal bursa patterns of types 1–4 in both lobes. The new species has 27 ridges in the mid-body in males, and 24 in females, and has one of the highest ratios of spicule length to body length (21−33%) in this genus.

Морфологічні та метричні особливості нематод Haemonchus contortus (Rudolphi 1803) Cobb 1898, виділених від овець (Ovis aries Linnaeus, 1758)

Представлені результати визначення особливостей будови імагінальних форм нематод виду Haemonchus contortus (Rudolphi 1803) Cobb 1898, що паразитують у домашніх овець (Ovis aries), у кліматичних умовах центрального та південно-східного регіонів України з урахуванням їх морфометричних показників. Встановлено, що видовими ознаками самців H. contortus є особливості у морфологічній будові хвостової бурси, спікул, рулька, статевого конусу, а також їх метричні показники. Самки H. contortus мають специфічну для даного виду варіабельність щодо структури, форми, розмірів та кількості кутикулярних клапанів в області вульви. The results of the determination of the features of the imaginal forms structure of nematodes of the species Haemonchus contortus (Rudolphi 1803) Cobb 1898, which parasitize in domestic ovaries (Ovis aries), in the climatic conditions of the central and South-Eastern regions of Ukraine are presented, taking into account their morphometric indices. It has been established that the specific features of the H. contortus males are the features of the morphological structure of the caudal bursa, spicules, shank, sexual cone, and their metric indices. The females of H. contortus have a specific for this species variability in the structure, shape, size, and number of cuticular valves in the vulva.

Two new species of Oswaldocruzia (Nematoda: Trichostrongylina: Molineoidea) parasites of the cane toad Rhinella marina (Amphibia: Anura) from Peru

Two new species of Oswaldocruzia, O. manuensis sp. nov., and O. urubambaensis sp. nov. are described and illustrated from Peru, these are parasites of the cane toad Rhinella marina. O. manuensis is characterized by having cervical alae which are not well developed, ridges without chitinous supports, caudal bursa type II and branches of fork of dissimilar length. O. urubambaensis is characterized by a caudal bursa of type I, ridges with chitinous supports, a thin cephalic vesicle and origin of rays 9 in tip of the dorsal trunk.

Two new nematode species of the genus Cosmocephalus Molin, 1858 (Spirurida: Acuariidae), with an amended generic diagnosis and an identification key to Cosmocephalus spp.

Cosmocephalus podicipis n. sp. is described from Podiceps cristatus from the vicinity of Ramsar, Iran (type host and type locality) and from Podiceps nigricollis from the Bulgarian Black Sea coast. Cosmocephalus pelecani n. sp. is described from Pelecanus conspicillatus from Mansfield, Victoria, Australia. Comparative materials of three other species of Cosmocephalus were examined and described. These are C. obvelatus (based on specimens from Larus argentatus from Bulgaria), C. jaenschi (based on a paratype from Phalacrocorax carbo from Australia) and C. capellae (based on a male nematode from Tringa totanus from Bulgaria, a new geographical record). Cosmocephalus faridi from Pelecanus onocrotalus from Egypt, which has been considered by previous authors as a synonym of C. obvelatus, is validated. Results of SEM observations are presented for C. podicipis and C. obvelatus. In all the species examined, the presence of a single ventral ridge was recorded in males anterior to the caudal bursa. The generic diagnosis is amended to include more comprehensive information on the morphology of the studied species. Currently, the genus Cosmocephalus includes 7 species. Cosmocephalus imperialis is recognised as a species inquirenda. Cosmocephalus argentinensis is proposed as a junior synonym of C. obvelatus. An identification key to the species of Cosmocephalus is presented.

The systematic position of some Ethiopian Nippostrongylinae (Nematoda, Trichostrongylina, Heligmosomoidea) from the National Collection of Animal Helminths, Onderstepoort, South Africa

The taxonomic status of some nippostrongyline nematodes deposited in the National Collection ofAnimal Helminths, Onderstepoort, is revised. Heligmonina boomkeri n. sp. is described from Aethomys chrysophilus from South Africa. The most closely related species by the body measurementsand the pattern of the caudal bursa is Heligmonina bignonensis Diouf, Bâ & Durette-Desset, 1997, a parasite of Mastomys erythroleucus from Senegal. It differs from the new species mainly in thenumber of ventral cuticular ridges at mid-body (four versus five) and the left ala in the male is shorterthan the body diameter. The systematic position of Heligmonina spira (Ortlepp, 1939) and Neoheligmonella capensis (Ortlepp, 1939) is confirmed here through their synlophe, which was not previously studied.