Diplopeltidae Filipjev 1918
Creators: name: Holovachov, Oleksandr
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Chromadorea
Araeolaimida
Diplopeltidae

description: Family Diplopeltidae Filipjev, 1918
Diagnosis (emended after Fonseca & Bezerra 2014)
Cuticle visually smooth, finely striated or coarsely annulated.Lateral alae absent.Somatic sensilla present. Inner and outer labial sensilla papilliform. Cephalic sensilla setiform; their bases located at the base of the labial region, anterior to amphidial fovea. Cervical (paramphidial) sensilla present in some genera, located at the level of the amphid and posterior to it. Deirid absent. Ocelli present or absent. Amphidial fovea unispiral or loop-shaped. Secretory-excretory system present. Oral opening apical or shifted either to dorsal or ventral body side. Buccal cavity tubular, cylindrical or undifferentiated. Teeth-like structures absent. Pharynx variable in shape; pharyngeal lumen uniform in thickness along the entire pharynx length; valves absent. Female reproductive system didelphic-amphidelphic or monodelphic-prodelphic. Ovaries outstretched or reflexed antidromously. Male reproductive system diorchic. Posterior testis is either anteriorly oriented and reflexed in the anterior section (reflexed terminal section of the germinal zone) or is posteriorly directed. Spicules symmetrical; gubernaculum present. Precloacal sensilla present in some genera. Three caudal glands present, their nuclei are incaudal. Caudal glands open separately via three pores, or together via a common spinneret.
Valid genera
Araeolaimus de Man, 1888
= Araeolaimoides de Man, 1893
= Coinonema Cobb, 1920
= Parachromagaster Allgén, 1929
Belgopeltula gen. nov.
Campylaimus Cobb, 1920
Cylindrolaimus de Man, 1880
Diplopeltis Cobb in Stiles & Hassal, 1905
= Dipeltis Cobb, 1891
= Discophora Villot, 1875
Diplopeltula Gerlach, 1950
Edalonema Andrássy, 2007
= Adelonema Holovachov & Sturhan, 2003
Intasia Tchesunov & Miljutina, 2008
Metaraeolaimoides De Coninck, 1936
Morlaxia Vincx & Gourbault, 1988
Mudwigglus Leduc, 2013
Pararaeolaimus Timm, 1961
Pseudaraeolaimus Chitwood, 1951
Southerniella Allgén, 1932
Key to genera of Diplopeltidae
See Table 4 for additional diagnostic characters.
1. Amphidial fovea a transverse slit; cuticle with ten longitudinal ridges .... Edalonema Andrássy, 2007
– Amphidial fovea double-loop-shaped in male, unispiral in female .................. Belgopeltula gen. nov.
– Amphidial fovea unispiral ................................................................................................................ 2
– Amphidial fovea loop-shaped ........................................................................................................... 4
2. Basal bulb absent; freshwater or terrestrial ........................................ Cylindrolaimus de Man, 1880
– Basal bulb present; marine ................................................................................................................ 3
3. Single anterior ovary ................................................................ Intasia Tchesunov & Miljutina, 2008
– Two ovaries (anterior and posterior) ....................................................... Southerniella Allgén, 1932
4. Oral opening shifted to the ventral body side ............................ Morlaxia Vincx & Gourbault, 1988
– Oral opening apical or shifted to the dorsal body side ..................................................................... 5
5. Basal pharyngeal bulb present; ovaries antidromously reflexed ............... Mudwigglus Leduc, 2013
– Basal pharyngeal bulb absent; ovaries outstretched ......................................................................... 6
6. Lateral alae present, in some species fused with the ventral limb of the amphid ............................... ................................................................................................................... Campylaimus Cobb, 1920
– Lateral alae absent ............................................................................................................................ 7
7. Amphid in a shape of rounded loop .................................................................................................. 8
– Amphid in a shape of elongated loop ............................................................................................. 10
8. Anterior body region abruptly narrowing; amphid at a distance equal to more than five labial region diameters from the anterior end ............................................. Metaraeolaimoides De Coninck, 1936
– Anterior body region cylindrical or subcylindrical; amphid at a distance equal to less than two labial region diameters from the anterior end ............................................................................................. 9
9. Buccal cavity cup-shaped; pronounced sexual dimorphism in the amphid size (large in males and small in females) .................................................................................. Pararaeolaimus Timm, 1961 – Buccal cavity conical; no sexual dimorphism in the amphid size .......... Araeolaimus de Man, 1888
10. Cervical (paramphideal) setae absent; caudal glands open via three separate pores .......................... ................................................................................................................. Diplopeltula Gerlach, 1950
– Cervical (paramphideal) setae present; caudal glands open via common spinneret ........................11
11. Amphid located on a well-developed refractive subcuticular plate .................................................... .......................................................................................... Diplopeltis Cobb in Stiles & Hassal, 1905
– Refractive subcuticular plate absent .......................................... Pseudaraeolaimus Chitwood, 1951
description: Published as part of Holovachov, Oleksandr, 2017, Belgopeltula belgica (Vincx & Gourbault, 1992) gen. et comb. nov. and Mudwigglus micramphidium sp. nov. from the west coast of Sweden, and reappraisal of the genus Pseudaraeolaimus Chitwood, 1951 (Nematoda: Araeolaimida: Diplopeltidae), pp. 1-21 in European Journal of Taxonomy 383 (383) on pages 16-19, DOI: 10.5852/ejt.2017.383, http://zenodo.org/record/3839807