Sphaerolaimus Bastian 1865
Creators: name: Zograf, Julia K.
name: Pavlyuk, Olga N.
name: Trebukhova, Yulia A.
name: Tu, Nguyen Dinh
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Monhysterida
Sphaerolaimidae
Sphaerolaimus

description: Identification key to valid species of the genus Sphaerolaimus
1 Spicules> 2 anal body diameters........................................................................ 2 - Spicules ≤ 2 anal body diameters........................................................................ 7
2 Spicules longer than tail................................................................................ 3 - Spicules shorter than tail............................................................................... 5 3 Cephalic setae short, 1.3–1.6 µm long .............................................................. S. callisto
- Cephalic setae ≥ 2 µm long............................................................................. 4
4 18–20 supplements present..................................................................... S. cuneatus
- Supplements absent.......................................................................... S. penicillus
5 Gubernaculum with small caudal apophyses.......................................................... S. kleini
- Gubernaculum without apophyses....................................................................... 6
6 Gubernaculum with denticles............................................................ S. macrocirculoides
- Gubernaculum without denticles............................................................. S. macrocirculus
7 Amphid behind the buccal cavity........................................................................ 8
- Amphid at level with the buccal cavity................................................................... 16
8 Gubernaculum absent........................................................................ S. abeskunus
- Gubernaculum present................................................................................. 9
9 Spicules double jointed...................................................................... S. crenellatus
- Spicules not double jointed............................................................................ 10
10 Gubernaculum with dorsal apophyses.................................................................... 11
- Gubernaculum without apophyses...................................................................... 13
11 Spicules with widened distal ends................................................................. S. caspius
- Spicules of even thickness............................................................................. 12
12 Gubernaculum with straight dorsal apophyses....................................................... S. gracilis
- Gubernaculum with L-shaped dorsal apophyses...................................................... S. limosus
13 Tail with numerous hook-shaped setae 25 µm long................................................. S. uncinatus
- Tail with sparse small and thin setae..................................................................... 14
14 Body length> 2 mm, gubernaculum long and narrow.............................................. S. makrolasius
- Body length <2 mm, gubernaculum short, triangular or plate-like............................................. 15
15 Spicules 70 µm or 1.3 corresponding body diameter.............................................. S. occidentalis
- Spicules 15 µm long or 0.8 corresponding body diameter.......................................... S. paragracillis
16 Gubernaculum absent....................................................................... S. maeoticus
- - Gubernaculum present.............................................................................. 17
17 Gubernaculum without apophyses...................................................................... 18
- Gubernaculum with apophyses.......................................................................... 23
18 Gubernaculum shield-shaped.......................................................................... 19
- Gubernaculum different in shape....................................................................... 20
19 Body length <1000 µm ......................................................................... S. minutus
- Body length> 1000 µm ........................................................................ S. hirsutus
20 Gubernaculum stick-shaped..................................................................... S. balticus
- Gubernaculum hook shaped............................................................................ 21
21 Amphid small, ca 17% of corresponding body diameter.............................................. S. peruanus
- Amphid big, ≥ 30% of corresponding body diameter........................................................ 22
22 Amphid ca 30 % of corresponding body diameter.................................................. S. pacificus
- Amphid ≥ 60% of corresponding body diameter.................................................. S. megamphis
23 Anterior sensilla papilliform................................................................... S. papillatus
- Anterior sensilla setiform............................................................................. 24
24 Supplements present................................................................................. 25
- Supplements absent.................................................................................. 27
25 Cervical setae long, 18-20 µm .................................................................... S. rivalis
- Cervical setae short, 8-16 µm ........................................................................... 26
26 Spicules short, 52-63 µm .................................................................. S. micropapillatus
- Spicules long, 83-90 µm ...................................................................... S. valentinae
27 Tail blunt with irregularly shaped end......................................................... S. arcospiculum
- Tail conico-cylindrical................................................................................ 28
28 Gubernaculum with small triangular apophyses............................................................ 29
- Gubernaculum with long well defined apophyses........................................................... 31
29 Spicules ≤ 1 anal body diameter................................................................... S. lutarius
- Spicules> 1.5 anal body diameter....................................................................... 30
30 Gubernaculum with two globose apophyses......................................................... S. ostreae
- Gubernaculum with triangular apophyses......................................................... S. glaphyrus
31 Lateral alae present................................................................................... 32
- Lateral alae absent................................................................................... 33
32 Amphid big,> 40% of corresponding body diameter, spicules short, 1.1 anal body diameters................ S. ganymede
- Amphid small, <30% corresponding body diameter, spicules long, 1.7 anal body diameters....................... S. io
33 Vulva shifted to the posterior half of the body, V = 70-80............................................. S. profundus
- Vulva near the center of the body, V = 55...................................................... S. haurakiensis
description: Published as part of Zograf, Julia K., Pavlyuk, Olga N., Trebukhova, Yulia A. & Tu, Nguyen Dinh, 2020, Description of three new Sphaerolaimus species (Nematoda: Sphaerolaimidae) form the South China Sea, pp. 491-514 in Zootaxa 4755 (3) on pages 508-509, DOI: 10.11646/zootaxa.4755.3.3, http://zenodo.org/record/3735212