Nematodes of Heligmonellidae (Strongylida) of Pogonomys championi Flannery and Pogonomys sylvestris Thomas (Rodentia: Muridae) from Papua New Guinea with descriptions of five new species

Abstract

Eight species of heligmonellid nematodes including five new species and a putative new species were identified from the digestive tracts of 12 Pogonomys championi Flannery and 27 P. sylvestris Thomas (Murinae: Hydromyini) from Papua Indonesia. Hasanuddinia pogonomyos Smales, 2014 had been previously described from P. loriae Thomas and P. macrourus (Milne-Edwards) and Odilia mackerrasae (Mawson, 1961) from several endemic rodent species. Bunomystrongylus ilami n. sp. can be distinguished from its congeners by the number of rounded ridges in the synlophe; Hasanuddinia hasegawai n. sp. by the number of ridges, three ventral being hypertrophied, in the synlophe; Montistrongylus kaindiensis n. sp. by the number of ridges in the synlophe and the length of the spicules; Odilia helgeni n. sp. in the characters of the synlophe ridges; Odilia whittingtoni n. sp. in the characters of the synlophe ridges and the length of the spicules. Species richness of the nematode assemblage of P. sylvestris, nine species and a juvenile heligmonellid, was comparable to those of P. loriae and P. macrourus but that of P. championi, five species, was considered depauperate. Species composition showed both commonalities between the host species as well as distinctive features. Three of five species in the assemblage were unique to P. championi and five of nine species to P. sylvestris.

Revision of the genera of Heligmonellidae (Nematoda, Heligmosomoidea), parasitic in Muridae from New Guinea

“…N, N’ male, O female. Sources: I–K redrawn from [ 35 ]; L–O redrawn from [ 37 ]. I’, N’, modified figures.…”

“…In these articles, 12 new genera including 18 species were erected ( Table 1 ): Melomystrongylus Smales, 2009 with two species [ 39 , 45 ]; Mawsonema Smales & Heinrich, 2010; with one species [ 45 ], Montistrongylus Smales & Heinrich, 2010 with four species [ 33 , 35 , 37 , 45 ]; Parasabanema Smales & Heinrich, 2010 with one species [ 45 ]; Pogonomystrongylus Smales, 2014 with one species [ 36 ]; Nugininema Smales, 2016 and Rodentanema Smales, 2016 with one species each [ 38 ]; Parvinema Smales, 2017 with one species [ 40 ]; Missimstrongylus Smales, 2018 with one species [ 41 ]; Flannerystrongylus Smales, 2019 with two species [ 42 , 43 ]; Helgenema Smales, 2020 with two species [ 43 , 44 ]; and Paramelomystrongylus Smales, 2020 with one species [ 43 ].…”

“… Bunomystrongylus Hasegawa & Mangali, 1996 (one species) [ 37 ]. Hasanuddinia Hasegawa & Syafruddin, 1994 (three species) [ 32 , 36 , 37 ]. Hasegawanema Durette-Desset & Digiani, 2015 (one species) [ 42 ].…”

“… Macrostrongylus Ow-Yang et al, 1983 (one species) [ 29 ]. Odilia Durette-Desset, 1973 (eight species) [ 29 – 31 , 36 , 37 , 39 ]. Paraheligmonelloides Fukumoto, Kamiya & Suzuki, 1980 (three species) [ 40 , 45 ].…”

Phylum Nematoda: trends in species descriptions, the documentation of diversity, systematics, and the species concept

“…The tension between conservative approaches which only present taxonomic work that has a high degree of certainty as against presenting descriptions which are incomplete or uncertain (often because of a lack of material) was summarized recently by Payne (2015). Numerous examples of nematode taxa without full description and formal scientific name, but with an informal name and incomplete description testify to the issue in nematode taxonomy (eg Carta & Skantar 2014, Choudhury & Nadler 2016, Davies et al 2015, De Oliviera et al 2014, leduc 2014, Moravec & Barton 2015, Moravec & Jirku 2014a, Moravec & Manoharan 2014a, Moravec et al 2016, Raymond et al 2014, Smales 2015, Tchesunov et al 2015, Thorne et al 2017, yong et al 2015. There has also been a formal definition of what is a known species complex in the highlystudied model genus Pristionchus (yoshida et al 2018).…”