Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus Author Boström, Sven 528300CC-D0F0-4097-9631-6C5F75922799 Department of Zoology, Swedish Museum of Natural History, Box 50007, SE- 104 05 Stockholm, Sweden & Email: sven. bostrom @ nrm. se (corresponding author) & urn: lsid: zoobank. org: author: 528300 CC-D 0 F 0 - 4097 - 9631 - 6 C 5 F 75922799 sven.bostrom@nrm.se Author Holovachov, Oleksandr 89D30ED8-CFD2-42EF-B962-30A13F97D203 Department of Zoology, Swedish Museum of Natural History, Box 50007, SE- 104 05 Stockholm, Sweden & Email: oleksandr. holovachov @ nrm. se & urn: lsid: zoobank. org: author: 89 D 30 ED 8 - CFD 2 - 42 EF-B 962 - 30 A 13 F 97 D 203 oleksandr.holovachov@nrm.se text European Journal of Taxonomy 2014 2014-06-16 87 1 19 journal article 22008 10.5852/ejt.2014.87 8ba6e51d-e141-47f2-9929-73127f823066 2118-9773 3835107 691BA51C-6882-4437-A037-0E8861DCBF17 Stegelleta ophioglossa Andrássy, 1967 Fig. 4A–D , Table 3 Stegelleta ophioglossa Andrássy, 1967: 208–210 , fig. 3. Diagnosis Stegelleta ophioglossa is characterised by a 315–490 µm long body in females; cuticle divided by regular longitudinal striations into 12–16 rows of blocks at midbody (excluding lateral field); lateral field with four incisures extending almost to tail terminus in females; three pairs of asymmetrical lips, pairs of lips separated by U-shaped primary axils without guarding processes, secondary axils demarcated by a shallow incisure, each lip asymmetrically rectangular with a smooth margin and without tines; three labial probolae, bifurcated at half of their length, prongs bent toward one another apically, “snaketongue”-shaped; pharyngeal corpus 3–5 times isthmus length; nerve ring, excretory pore and deirids at level of isthmus; vulva without flap; spermatheca 7–13 µm long; postuterine sac 7–17 µm long. Fig. 4. A–D . Stegelleta ophioglossa Andrássy, 1967 . A . Pharyngeal region. B . Anterior end, surface view. C . Female gonad. D . Female tail. E–G . Stegelleta tuarua Yeates, 1967 . E . Pharyngeal region. F . Anterior end, surface view. G . Male tail. Scale bar = 20 µm. Table 3. Measurements of females of Stegelleta ophioglossa Andrássy, 1967 from Senegal compared with other populations of the same species (presented as mean ± s.d. and (range) or only range). * Calculated from data in original publication. ** Number of annuli from anterior end to nerve ring, excretory pore and deirid, respectively; - indicates that data is not available or not applicable.

Population	Mongolia	Uzbekistan	Senegal	Iran	Spain	Senegal
Reference	Andrássy 1967	Mavljanov 1978	De Ley et al. 1990	Shokoohi et al. 2008	Abolafia et al. 2011	This paper
No. & sex	? ♀♀	19 ♀♀	8 ♀♀	4 ♀♀	? ♀♀	6 ♀♀
Body length	470–490	335–390	347 ± 16 (324–356) 15–18 104 ± 5 (99–111) 31 ± 2 (28–33) 9–10	347 ± 17.5 (324–356)	330–420	353 ± 22 (315–382)
Body diameter (BD)	-	17.7*		16.1 ± 1.2 (15–18)	-	17.9 ± 1.5 (15.5–20.5)
Pharynx length	-	114.7*		93.9 ± 3.2 (90–98)	-	102.7 ± 3.8 (97–107)
Tail length	- -	34.8*		30.0 ± 1.5 (29–32)	27–32	31.6 ± 1.8 (29–34)
Anal body diam. (ABD)		10		9.6 ± 0.7 (9–10)	-	10.8 ± 0.6 (9.5–11.5)
Vulva	-	253*	-	219.7 ± 12.6 (209–238)	-	224 ± 13 (200–243)
V-A/T	-	-	-	-	-	3.1 ± 0.1 (2.8–3.2)
a	20–21	18.1–22.9	21.3 ± 1.2 (19.7–23.1)	21.6 ± 0.6 (20.8–21.9)	19–23	19.8 ± 0.8 (18.6–20.4)
b	3.3–3.4	3.1–3.6	3.3 ± 0.1 (3.2–3.5)	3.7 ± 0.1 (3.7–3.8)	3.2–3.6	3.4 ± 0.2 (3.2–3.7)
c	11–12	10.4–11.8	11.2 ± 0.6 (10.4–12.9)	11.6 ± 0.2 (11.3–11.8)	12–13	11.2 ± 0.4 (10.5–11.6)
c’	3.0–3.5	3.3 ± 0.2 (3.0–3.6)	3.1 ± 0.3 (2.9–3.4)	2.3–2.7	2.9 ± 0.2 (2.6–3.2)
V (%)	60–62	63.0–66.8	61–63	63.2 ± 0.6 (63–64)	62–63 -	63.5 ± 0.8 (63–65)
Lip region diameter	-	-	-	4.9 ± 0.7 (4–6)		6.6 ± 0.3 (6–7)
Stoma length	-	-	7–9	7.8 ± 1.2 (6–8)	-	8.8 ± 0.3 (8.5–9.0)
Corpus length	-	-	67 ± 3 (63–71)	63.5 ± 3.6 (60–68)	- -	65.9 ± 2.9 (61.5–69.0)
Isthmus length	-	-	22 ± 2 (18–25) 13–14	14.7 ± 2.8 (12–18)		15.9 ± 1.1 (14.5–17.0)
Bulb length	-	-		16.0 ± 0.9 (16–17)	-	14.1 ± 0.9 (12.0–14.5)
Bulb diameter	-	-	-	-	-	11.3 ± 0.9 (9.5–12.0)
Corpus/isthmus ratio	-	-	3	3.8–5.0	3	4.2 ± 0.2 (4.0–4.4)
Nerve ring from ant. end	-	-	68 ± 4 (60–71)	67.7 ± 2.9 (64–71)	-	76 ± 3.6 (69–81)

Population Mongolia Uzbekistan			Senegal	Iran	Spain	Senegal
Excr. pore from ant. end	-	-	66 ± 3 (61–71)	69.4 ± 3.6 (70–74)	-	79.5 ± 3.5 (72–83)
Deirid from ant. end	-	-	75 ± 2 (72–78)	73.6 ± 3.3 (70–78)	-	82.3 ± 4.0 (75–87)
R NR **	-	-	-	-	-	36 ± 1 (35–37)
R EP **	- -	-	-	36–39	-	37 ± 1 (36–38)
R DEI **		-	-	43	-	39 ± 1 (37–40)
Annuli width at midbody	1.7–2.0	2.1	1.5–2.1	1.7–2.3	-	1.6–2.2
Annuli width anteriorly	-	1.5	-	-	-	1.7–2.0
Vagina length	-	-	3–5	6.2 ± 0.6 (6–7)	-	5.8 ± 0.3 (5.5–6.0)
Spermatheca length	-	-	≤ 13	8.1 (n=1)	13	8.9 ± 1.7 (7–12)
PUS length	-	-	11–14	13.6 ± 4.9 (8–17)	10	7.0–8.5
PUS/VBD	~1	-	1.1–1.4	0.5–0.9	-	0.4–0.5
Rectum	-	-	13 ± 2 (10–16)	12.7 ± 0.8 (12–14)	-	12.7 ± 1.5 (9.5–14.5)
Rectum/ABD	1.7–2.0	-	-	1.3–1.4	> 1	1.2 ± 0.1 (1.0–1.3)
Phasmid	-	-	-	-	-	8.8 ± 0.4 (8.5–9.5)
Phasmid (% of tail)	~30	-	21–29	24–31	33–46	27.5 ± 2.4 (25–32)
Rows of cuticle blocks	14	16	16	-	12	16

Material examined SENEGAL : 6 ♀♀ , SMNH 135943–135944, Kaolack region , Thyssé-Kaymor, legit C. Villenave. Description Adult Body slightly arcuate ventrad when killed by heat. Cuticle annulated, annuli 1.6–2.2 µm wide at midbody and 1.7–2.0 µm wide in pharyngeal region. Cuticle tessellated: longitudinal striae giving it a tiled appearance, 16 rows of blocks at midbody (excluding lateral field). Lateral field consisting of two wings separated by a narrow groove, appearing as four incisures under LM, occupying about 20% of body diameter, extending almost to tail terminus in females. Lip region slightly offset, carrying 6 + 4 papillae and two round amphids. Three pairs of asymmetrical lips, one dorsal and two ventrolateral. Pairs of lips separated by U-shaped primary axils without guarding processes. Each pair with a shallow incisure demarcating a secondary axil. Each lip asymmetrically rectangular with a smooth margin. Three labial probolae, 6–7 µm high, bifurcated at half of their length, prongs bent toward one another apically (“snake-tongue”-shaped). Stoma somewhat longer than lip region diameter. Stomatal parts not clearly discernible. Cheilorhabdia bacilliform in lateromedian view; metastegostom with a dorsal denticle. Pharynx cephaloboid. Pharyngeal corpus cylindrical; isthmus narrow, not clearly demarcated from corpus; bulb oval, with valves. Nerve ring, excretory pore and deirids at level of isthmus. Female Reproductive system monodelphic, prodelphic, in dextral position in relation to intestine. Ovary reflexed posteriorly at oviduct, ovary straight posterior to vulva. Spermatheca small, not developed. Postvulval uterine sac short, about one-half of vulval body diameter long. Vagina about one-third of vulval body diameter. Vulval lips not protruding. Tail conoid with 12–20 ventral annuli, terminus truncate. Phasmids located at about one-fourth to one-third of tail length. Male Not found. Remarks The specimens described here agree in many respects with the population of Stegelleta ophioglossa from Senegal described by De Ley et al. (1990) and several other populations of S. ophioglossa ( Andrássy 1967 ; Mavljanov 1978 ; Shokoohi et al. 2008 ; Abolafia et al. 2011 ).