Some trichinelloid nematodes from marine fishes off New Caledonia, including description of Pseudocapillaria novaecaledoniensis sp. nov. (Capillariidae)

Abstract

Examinations of materials of trichinelloid nematodes recently collected from the digestive tract of marine fishes off New Caledonia, South Pacific, revealed the presence of several species of the families Capillariidae and Trichosomoididae, including capillariids Pseudocapillaria novaecaledoniensis sp. nov. from the deep-sea Pristipomoides argyrogrammicus (Valenciennes) (Lutjanidae) and Pseudocapillaria echenei (Parukhin, 1967) from Echeneis naucrates Linnaeus (Echeneidae), and the trichosomoidid Huffmanela sp. (female) from Bodianus perditio (Quoy et Gaimard) (Labridae). P. novaecaledoniensis is characterized mainly by the structure and length (318-321 µm) of spicule and the presence of a dorsal cuticular membrane interconnecting both ventrolateral caudal lobes in the male (subgenus Ichthyocapillaria Moravec, 1982). The previously poorly known P. echenei is redescribed and recorded for the first time from the South Pacific Ocean. In addition, five morphologically different types of capillariid females without generic identification, designated as Capillariidae gen. spp. 1-5, each of them probably representing a new species, were recorded from Fistularia commersonii Rüppell (Fistulariidae), Synodus dermatogenys Fowler (Synodontidae), Carangoides oblongus (Cuvier) (Carangidae), Diagramma pictum (Thunberg) (Haemulidae) and Stegostoma fasciatum (Hermann) (Stegostomidae), respectively. Capillaria decapteri is transferred to Pseudocapillaria Mendonça, 1963 as P. decapteri (Luo, 2001) comb. nov. RésuméL'examen de Nématodes Trichinelloidea récemment récoltés dans le tube digestif de poissons marins de Nouvelle-Calédonie, Pacifique Sud, a révélé la présence de plusieurs espèces des familles Capillariidae et Trichosomoididae, à savoir les Capillariidae Pseudocapillaria novaecaledoniensis sp. nov. du poisson de profondeur Pristipomoides argyrogrammicus (Valenciennes) (Lutjanidae) et Pseudocapillaria echenei (Parukhin, 1967) chez Echeneis naucrates Linnaeus (Echeneidae), et le Trichosomoididae Huffmanela sp. (femelle) chez Bodianus perditio (Quoy et Gaimard) (Labridae). P. novaecaledoniensis est caractérisé principalement par la structure et la longueur (318-321 µm) du spicule et la présence d'une membrane cuticulaire dorsale connectant les deux lobes ventrolatéraux chez le mâle (sous-genre Ichthyocapillaria Moravec, 1982). L'espèce P. echenei, auparavant peu connue, est redécrite et mentionnée pour la première fois de l'Océan Pacifique Sud. De plus, cinq diffé-rents types morphologiques de Capillariidae femelles sans identification générique, désignés comme Capillariidae gen. spp. 1-5, chacun d'eux représentant probablement une nouvelle espèce, sont mentionnés respectivement chez Fistularia commersonii Rüppell (Fistulariidae), Synodus dermatogenys Fowler (Synodontidae), Carangoides oblongus (Cuvier) (Carangidae), Diagramma pictum (Thunberg) (Haemulidae), et Stegostoma fasciatum (Hermann) (Stegostomidae). Capillaria decapteri est transféré dans Pseudocapillaria Mendonça, 1963 comme P. decapteri (Luo, 2001 comb. nov.

Cucullanid nematodes (Nematoda: Cucullanidae) from deep-sea marine fishes off New Caledonia, including Dichelyne etelidis n. sp.

“…Parasitological examinations of deep-sea marine fishes from the external slope of the barrier reef of New Caledonia yielded, among other helminths (Bray & Justine 2009;Moravec & Justine, 2010), some cucullanid nematodes of the genera Cucullanus and Dichelyne Jägerskiöld, 1902 parasitising five species of lutjanid and lethrinid fishes: deep-water red snapper Etelis carbunculus Cuvier, deep-water longtail red snapper E. coruscans Valenciennes, goldflag jobfish Pristipomoides auricilla (Jordan, Evermann & Tanaka), crimson jobfish P. filamentosus (Valenciennes) (all Lutjanidae) and trumpet emperor Lethrinus miniatus (Forster) (both Lethrinidae). Results of their taxonomic evaluation, based on detailed light microscopy (LM) and scanning electron microscopy (SEM) examinations, are presented herein.…”

Lobocapillaria austropacifica n. g., n. sp. (Nematoda: Capillariidae) from the obtuse barracuda Sphyraena obtusata Cuvier (Sphyraenidae, Perciformes) off eastern Australia

“…It is interesting that the presence of the well-developed spicular canal and the rough transverse grooves on the surface of the spicule, as found in L. austropacifica, were previously considered to be features occurring only in representatives of some capillariid genera characterised by the presence of a spiny spicular sheath, such as Amphibiocapillaria Moravec, 1982, Capillaria, Paratrichosoma Ashford & Muller, 1978 or Piscicapillaria (see Lomakin & Trofimenko, 1982;Moravec, 2001a;Moravec & Justine, 2010;.…”

“…In contrast to members of Pseudocapillaria, species of Lobocapillaria are characterised by the presence of conspicuously large, elongate male caudal lobes, approximately two to three times as long as wide, with a considerably thickened cuticle (vs caudal lobes small, globular, without markedly thickened cuticle), a spicular canal (vs spicular canal absent), a flat, laterally markedly expanded spicule with a pointed distal tip (vs rod-like spicule with a rounded distal tip), a spicular surface with numerous rough transverse grooves in the middle region of the spicule (vs rough transverse grooves absent on the spicule) and an evaginated spicular sheath which is tubular, very long and has a conspicuous globular extension near its proximal end (vs the extruded spicular sheath being tubular, but shorter, without such an extension). Whereas all 19 species of Pseudocapillaria from fishes are parasites of the host's intestine or, rarely, of the stomach (Moravec, 2001a;Hobbs & Hassan, 2010;Moravec & Justine, 2010;Inglesias et al, 2013), those of Lobocapillaria are located in the gall-bladder.…”

“…To date, it includes ten nominal species: three of them, Capillostrongyloides tandani (Johnston & Mawson, 1940), Paracapillaria plectroplites (Johnston & Mawson, 1940) and Pseudocapillaria nannupensis Hobbs & Hassan, 2010, were described from freshwater fishes, whereas seven others, Capillaria cooperi Johnston & Mawson, 1945, Capillostrongyloides physiculi (Johnston & Mawson, 1945), C. tasmanica (Johnston & Mawson, 1945), Gessyella latridopsis (Johnston & Mawson, 1945), Piscicapillaria orectolobi (Johnston & Mawson, 1951), P. rhinobati (Johnston & Mawson, 1945) and ''Capillaria'' lepidopodis Johnston & Mawson, 1944 (species inquirenda and incertae sedis), were reported from marine teleosts and elasmobranchs (Johnston & Mawson, 1940, 1944, 1945a, b, 1951Moravec, 1987Moravec, , 2001aHobbs & Hassan, 2010). An additional three nominal species of capillariids, Capillaria plectropomi Moravec & Justine, 2014, Pseudocapillaria echenei (Parukhin, 1967 and P. novaecaledoniensis Moravec & Justine, 2010, were found in marine fishes off nearby New Caledonia (Moravec & Justine, 2010. However, since the taxonomy of capillariids is mainly based on male characteristics, these parasites are frequently unidentified in faunistic surveys, being reported only as Capillaria (s.l.)…”

Parasitic nematodes of marine fishes from Palmyra Atoll, East Indo-Pacific, including a new species of Spinitectus (Nematoda, Cystidicolidae)

“…Few studies have surveyed the parasites of all the fish species found in a habitat. In the Eastern Indo-Pacific, several studies have reported parasitic nematodes of marine fishes from Australia, French Polynesia, Okinawa (Japan), Palawan (Philippines) Indonesia, off New Caledonia,and the Hawaiian Islands (Johnston and Mawson 1951; Schmidt 1969; Deardorff et al 1982; Lester and Sewell 1989; Bruce and Cannon 1990; Hasegawa et al 1991; Rigby et al 1997, 1999; Morand and Rigby 1998; Justine 2007; Lafferty et al 2008; Moravec and Justine 2010; Palm and Bray 2014; Moravec and Justine 2018). Most studies focus on a single host species or a particular nematode genus, and a few include several large fish species (Justine 2007, 2010; Justine et al 2012; Palm and Bray 2014).…”