taxonID	type	description	language	source
FA24BD79FFDF0313FF7BFA9EFC3CF9ED.taxon	diagnosis	Diagnosis (modified from Shimada et al. 2021). Cuticle smooth or striated; three lips high, deeply incised; anterior sensilla all setiform; inner labial and cephalic sensilla jointed or not; outer labial sensilla jointed; buccal cavity not divided; teeth absent; amphids unispiral; long subterminal setae on tail present or absent; spicules shorter than 2.0 cloacal body diameters; gubernaculum with projection (s) at distal end; male monorchic with anterior testis outstretched; female didelphic-amphidelphic with reflexed ovaries.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDC0310FF7BFF33FBEDF921.taxon	description	(Figures 1 – 2, Table 1)	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDC0310FF7BFF33FBEDF921.taxon	materials_examined	Type material. Three males and two females were measured and studied. Holotype: ♂ 1 on slide 19 YMD 2 - 2 - 108; paratypes: ♂ 2 on slide 19 YMD 2 - 2 - 28, ♂ 3 on slide 19 YMD 2 - 2 - 46, ♀ 1 on slide 19 YMD 2 - 2 - 30, and ♀ 2 on slide 19 YMD 2 - 2 - 27. Type locality and habitat. Specimens were collected from intertidal muddy sediment (0 - 2 cm) at Yangma Island, Shandong Province. 37 º 45 ′ N, 121 º 61 ′ E.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDC0310FF7BFF33FBEDF921.taxon	etymology	Etymology. Species name gracilis means graceful and slender.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDC0310FF7BFF33FBEDF921.taxon	description	Measurements. All measurement data are given in Table 1. Description. Males. Body cylindrical, 1882 – 1975 μm in length. Six short inner labial setae unjointed, 3 μm in length (0.13 – 0.14 head diameter long). Six outer labial setae three-jointed, 15 – 19 μm in length (0.7 – 0.8 head diameter long). Four cephalic setae unjointed, 6 – 8 μm in length (0.29 – 0.36 head diameter long), outer labial setae and cephalic setae in a same circle. Somatic setae (4 – 5 μm in length) scarcely present in pharynx and caudal region. Cuticle faintly striated. Amphidial fovea situated at middle of buccal cavity, unispiral with circular aperture, 6 – 7 μm in diameter (23 % – 28 % corresponding body diameter), 19 – 20 μm from anterior body end. Three lips high and deeply incised. Buccal cavity cuticularized, cylindrical in shape and without teeth, 11 – 14 μm in width and 34 – 35 μm in length. Pharynx cylindrical, anterior end partly surrounding buccal cavity and posterior end slightly swollen, 343 – 357 μm in length. Nerve ring situated 143 – 161 μm from anterior end. Secretory-excretory system and cardia not observed. Reproductive system monorchic with anterior testis outstretched, 276 μm in length (14.2 % of total body length), located on the left of the intestine. Spicules paired and slightly curved, 37 – 41 μm in length (1.1 – 1.2 cloacal body diameter). Gubernaculum kidney-like, distal end cuticularized with a short projection. Precloacal supplements absent. Tail conical, rounded at posterior end, 130 – 140 μm (3.6 – 4.1 anal body diameter) in length, three caudal glands in line. Caudal setae present, long subterminal setae absent. Females. Similar to males in most characters. Reproductive system didelphic and amphidelphic with reflexed ovaries, 494 μm in length (25 % of total body length). Anterior and posterior ovary on the right of the intestine. Vulva located near mid-body, 941 – 1019 μm from anterior end. Vagina short and sclerotized.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDC0310FF7BFF33FBEDF921.taxon	diagnosis	Differential diagnosis and discussion. Parabathylaimus gracilis sp. nov. is characterized by six outer labial setae three-jointed in males and females, cephalic setae and inner labial setae unjointed, amphidial fovea positioned at middle of buccal cavity, spicules slightly curved, gubernaculum kidney-like and distal end cuticularized with a pointed projection, tail conical without long subterminal setae. Parabathylaimus gracilis sp. nov. is similar to P. jare, P. arthropappus, and P. denticaudatus in tail shape, but differs from P. arthropappus in the shorter body length (1882 – 1995 μm vs. 3100 – 3300 μm), inner and outer labial setae shape (inner unjointed, outer three-jointed vs. inner three-jointed, outer four-jointed), shorter outer labial setae and cephalic setae (15 – 19 μm, 6 – 8 μm vs. 47 – 52 μm, 18 – 19 μm), amphidial fovea position (at middle of buccal cavity vs. posterior to buccal cavity), spicules length and shape (37 – 41 μm, proximal end not cephalated vs. 50 – 57 μm, proximal end cephalated), and absence of long subterminal setae (present in P. arthropappus). The new species differs from P. denticaudatus in the shorter outer labial setae (15 – 19 μm vs. 25 – 30 μm), amphidial fovea position and diameter (at middle of buccal cavity, 23 – 28 % corresponding body diameter vs. posterior to buccal cavity, 14 % corresponding body diameter), outer labial setae shape (three-jointed vs. four-jointed), unjointed inner labial setae and cephalic setae (jointed in P. denticaudatus). The new species differs from P. jare in the shorter body length (1882 – 1995 μm vs. 2982 – 3492 μm), outer labial setae shape (three-jointed vs. three-jointed in male and two-jointed in female), amphidial fovea position (at the middle buccal cavity vs. posterior end at level of posterior buccal cavity), spicules shape (slightly curved vs. slightly curved, with heel-shaped projection), and gubernaculum shape (distal end swollen with one projection vs. distal end with two tooth-like projections).	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFDB0317FF7BF90AFE30F804.taxon	diagnosis	Diagnosis (Modified from Rho et al. 2020). Buccal cavity large and narrowly divided into two parts by a sclerotized transverse band; ocelli present or absent; presence of three teeth, of which one ventro-sublateral is the largest; amphids dorsally spiral; posterior section of pharynx with multiple bulbs (4 – 10); males usually with winged precloacal supplements (round shaped in B. gracilis Gagarin & Thanh, 2016 and long pocket-shaped in B. warwicki) or absent, spicules short and curved, gubernaculum absent or present; females didelphic — amphidelphic with reflexed ovaries.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFD8031AFF7BFC53FB2EFD69.taxon	description	(Figures 3 – 4, Table 2)	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFD8031AFF7BFC53FB2EFD69.taxon	materials_examined	Type material. One male and three females were measured and studied. Holotype: ♂ 1 on slide 19 YMD 2 - 4 - 82; paratypes: ♀ 1, ♀ 2 and ♀ 3 on slides 19 YMD 2 - 2 - 49. Type locality and habitat. Specimens were collected from intertidal muddy sediment (0 - 2 cm) at Yangma Island, Shandong Province. 37 º 45 ′ N, 121 º 61 ′ E.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFD8031AFF7BFC53FB2EFD69.taxon	etymology	Etymology. The species name means Chinese, the type locality.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFD8031AFF7BFC53FB2EFD69.taxon	description	Measurements. All measurement data are given in Table 2. Description. Males. Body comparatively short, 1405 μm in length, anterior and posterior body end tapered. Cuticle smooth. The anterior body end markedly tapered and body width at level of posterior pharynx end 3.8 times as wide as labial region. Buccal cavity separated into two chambers by a cuticularized ring without denticles, with one large right ventral sublateral tooth, one small left sublateral tooth and one small dorsal tooth. Buccal cavity deep and cuticularized, 9 μm in length (1 head diameter long). Inner labial sensilla papillae, outer labial setae and cephalic setae arranged in one circle, 7 μm in length. Ten cervical setae 34 μm from anterior end, 7 μm in length. Amphidial fovea not observed and ocelli absent. Pharyngeal region well developed, 361 μm in length, posterior region modified into seven bulbs (116 μm in length). Nerve ring situated 203 μm from anterior end. Cardia short, conoid. Testes paired, opposed and outstretched, both located on the left of the intestine. Spicules paired and straight, 36 μm in length (1.3 cloacal body diameter), tapered in proximal and distal end, thickened in the middle part. Gubernaculum short and without apophysis, 9 μm in length. Two winged precloacal supplements small and well developed, anterior precloacal supplement (beginning from center of supplements) 193 μm and posterior 134 μm from cloacal opening respectively. Tail conico-cylindrical in shape, 101 μm (3.6 anal body diameter) in length, and cylindrical part short (16 % of tail length). Three caudal glands present in line. Tail with three terminal setae. Females. Similar to males in most characters. Reproductive system didelphic-amphidelphic, with reflexed ovaries, 630 – 752 μm in length (38 % of total body length). Anterior and posterior ovaries on the right of the intestine. Vulva located slightly posterior to the mid-body, 938 – 1064 μm (55 % – 56 % from anterior end). Vagina short and sclerotized.	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
FA24BD79FFD8031AFF7BFC53FB2EFD69.taxon	diagnosis	Differential diagnosis and discussion. Belbolla sinica sp. nov. is characterized by comparatively short body length, posterior pharynx with seven bulbs, spicules straight with proximal and distal end tapered and middle part thickened, gubernaculum short without apophysis, two winged precloacal supplements small and well developed, tail conico-cylindrical with cylindrical portion short. By now, four species of Belbolla, B. asupplementata Juario, 1974; B. gracilis Gagarin & Thanh, 2016; B. heptabulba Timm, 1961 and B. warwicki present 7 pharyngeal bulbs. Belbolla sinica sp. nov. differs from B. asupplementata in the gubernaculum shape (without apophysis vs. with small apophysis), presence of precloacal supplements (two winged precloacal supplements vs. absence of precloacal supplements), and tail length (101 – 124 μm vs. 146 – 167 µm). The new species differs from B. gracilis in the spicules length and shape (36 μm, straight vs. 50 μm, slightly arched), gubernaculum shape (without apophysis vs. with long caudal apophysis), precloacal supplements shape (two winged precloacal supplements vs. two round shaped supplements) and tail shape (cylindrical portion short, 13 % – 16 % of tail length vs. cylindrical portion short long, 81 % of tail length). The new species differs from B. heptabulba in the spicules shape (straight, proximal end tapered vs. arcuate, proximal end cephalated), presence of gubernaculum (absent in B. heptabulba). The new species differs from B. warwicki in the gubernaculum shape (without apophysis vs. with small apophysis), precloacal supplements shape (two winged precloacal supplements vs. two pocket-shaped precloacal supplements).	en	Wang, Mengna, Guo, Wen, Wang, Chunming (2022): Two new species, Parabathylaimus gracilis sp. nov. and Belbolla sinica sp. nov (Nematoda: Enoplida), from Yangma Island of the Yellow Sea, China. Zootaxa 5200 (4): 344-354, DOI: https://doi.org/10.11646/zootaxa.5200.4.3
