Simpliconematidae Blome & Schrage 1985

• Main Authors: Leduc, Daniel, Zhao, Zeng Qi, Sinniger, Frederic
• Format: Text
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Nematoda; Adenophorea; Enoplida; Simpliconematidae; New Zealand; White Sea; Antarktis*; Barentssee
• Online Access: https://dx.doi.org/10.5281/zenodo.5616602; https://zenodo.org/record/5616602

Family Simpliconematidae Blome & Schrage, 1985 Diagnosis (from Blome & Schrage 1985) Cuticle striated. Labial region divided into three lips. Cephalic sensilla with 6+10 arrangement; setose outer labial and cephalic sensilla. Circular amphideal fovea. Male reproductive system monorchic with anterior testis to the left of the intestine; sperm cell drop-shaped. Spicules slender, elongated; gubernaculum absent. Tail filiform. Females not known. Type genus Simpliconema Blome & Schrage, 1985. Remarks Simpliconema is characterized by cephalic and caudal regions similar to those of Marisalbinema Tchesunov, 1990 (family Xyalidae; Fig. 2), which was described after the treatment of the Trefusiida by Lorenzen (1981, 1994), while the long slender spicules are similar to those of Paramonohystera Steiner, 1916 (Xyalidae). More broadly, Simpliconema is characterized by features which resemble the Monhysterida more closely than the Trefusiina, including a circular amphideal fovea (within the Trefusiina, the amphideal fovea is circular only in some Trefusiidae genera, namely species of Cytolaimium , Trefusia , and Rhabdocoma ), 6+10 arrangement of the anterior sensilla (usually 6+6 + 4 in the Trefusiina, except in the Lauratonematidae, Trefusialaimus and Tripylina ), and the presence of only one anterior testis (usually two testes in Trefusiina, except some Lauratonematidae, Trefusialaimus , and Trischistomatidae). Blome & Schrage (1985) also noted differences with the Trefusiidae, such as the structure of the sperm (drop-shaped vs elongated in the Trefusiidae) and differentiated vas deferens (vs undifferentiated in the Trefusiidae). It appears likely that the taxonomic placement of the Simpliconematidae will need to be updated. Morphological information on the structure of the female reproductive system should allow us to settle the placement of this genus. : Published as part of Leduc, Daniel, Zhao, Zeng Qi & Sinniger, Frederic, 2020, Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida), pp. 1-45 in European Journal of Taxonomy 661 on page 8, DOI: 10.5852/ejt.2020.661, http://zenodo.org/record/3888846 : {"references": ["Blome D. & Schrage M. 1985. Freilebende Nematoden aus der Antarktis: Mit einer Beschreibung der Simpliconematidae nov. fam. (Trefusiida) und einer Revision von Filipjeva Ditlevsen, 1928 (Monhysterida, Xyalidae). Veroffenlichungen des Instituts fur Meeresforschung in Bremerhaven 21: 71 - 96.", "Tchesunov A. V. 1990. New taxa of marine free-living nematodes of the Family Xyalidae Chitwood, 1951 (Nematoda, Chromadorida, Monhysterida) from the White Sea. In: Gagarin V. G. (ed.) Fauna, Biology and Systematics of Free-living Lower Worms. Institute of Inland Water Biology, Proceedings 64: 101 - 117. Academy of Sciences of the USSR, St Petersburg.", "Lorenzen S. 1981. Entwurf eines phylogenetischen Systems der freilebenden Nematoden. Veroffentlichungen des Instituts fur Meeresforschung in Bremerhaven 7: 1 - 472.", "Lorenzen S. 1994. The Phylogenetic Systematics of Freeliving Nematodes. The Ray Society, London.", "Steiner G. 1916. Freilebende Nematoden aus der Barentssee. Zoologische Jahrbucher 39: 511 - 664."]}