Gairleanema pulchra, Liang & Guo & Wang, 2024

Liang, Huixin, Guo, Wen & Wang, Chunming, 2024, Two new species of Nematoda: Gairleanema pulchra sp. nov. (Tripyloididae) and Axonolaimus dimorphous sp. nov. (Axonolaimidae) from the Yellow Sea, China, Zootaxa 5447 (4), pp. 547-561 : 548-552

publication ID

https://doi.org/ 10.11646/zootaxa.5447.4.6

publication LSID

lsid:zoobank.org:pub:D9D8103B-AE56-405C-A74C-CF69A06F40B5

DOI

https://doi.org/10.5281/zenodo.11150590

persistent identifier

https://treatment.plazi.org/id/F11C878F-FB77-FB37-D985-F9AC3AC00A80

treatment provided by

Plazi

scientific name

Gairleanema pulchra
status

sp. nov.

Gairleanema pulchra sp. nov.

( Figures 1–2 View FIGURE 1 View FIGURE 2 , Table 1 View TABLE 1 )

Type material. One male and four females were measured and studied. Holotype: ♂ 1 on 22SHT5–3–6; GoogleMaps paratypes: ♀ 1 on 22RZDT4–1–7, ♀ 2 on 22SHT5–2–1, ♀ 3 on 22RZDT4–3–5 and ♀ 4 on 22RZDT4–2–7. GoogleMaps

Type locality and habitat. Specimens were collected from intertidal muddy sediment at Rizhao coast, Shandong Province, China; 35°23′N, 119°33′E (RZDT), 35°27′N, 119°35′E (SHT); 0–8 cm sediment depth GoogleMaps .

Etymology. Species epithet pulchra refers to beautiful.

Descriptions

Male. Cuticle with indistinct transverse striations. Cephalic capsule slightly developed. Three high lips each with a pair of inner labial setae, bulbous swelling about half way along their length. Six long outer labial setae and four short cephalic setae in one circle, somatic setae scarce and present mainly in tail region. Buccal cavity with a large pointed dorsal tooth, two small ventrosublateral teeth, amphidial fovea oval-shaped, 29 μm from anterior end. Pharynx region cylindrical. Nerve ring, 114 μm from anterior end. Cardia triangular. Tail 5.1 cloacal diameters long, posterior half cylindrical. Caudal setae present, 6–9 μm in length, and two terminal setae, 16 μm in length. Three caudal glands in line.

Reproductive system monorchic, anterior testis to the right of intestine. Spicules L-shaped, proximal end slightly cephalated, 1.1 cloacal diameters along arc. Gubernaculum boat shaped, 25 μm in length, with proximal end hooked anteriorly. One ventral precloacal setae present, 17 μm in length. Seven precloacal supplements oval-shaped, distance between supplements gradually diminishing from the anterior to cloaca. The posterior supplement 29 μm from the cloaca and the anterior supplement 150 μm from the cloaca.

Females. Similar to male in most characteristics, but females bodies slightly longer. Caudal setae absent. Reproductive system didelphic, with opposed and reflexed ovaries. Anterior ovary to right of intestine and posterior ovary to left of intestine. Vulva slightly posterior to mid-body.

Differential diagnosis and discussion. Gairleanema pulchra sp. nov. is characterized by amphidial fovea oval-shaped, spicules L-shaped with proximal end slightly cephalated, gubernaculum boat-shaped with proximal end hooked anteriorly, seven precloacal supplements oval-shaped, supplements distance gradually diminishing from the anterior end to cloaca.

Gairleanema pulchra sp. nov. is similar to G. anagremilae in body length and cephalic setae length, but it differs in spicules length and shape (33 μm, without ventral alae vs. 52–53 μm, with broad ventral alae), precloacal supplements number and shape (7, oval-shaped vs. 2, mammiliform), gubernaculum shape (boat-shaped with proximal end hooked anteriorly vs. with hooked dorsal apophysis).

TABLE 1. Measurements of Gairleanema pulchra sp. nov. (in µm, except for ratios).

Characters Holotype Paratypes
  male females (n = 4)
Total body length 1446 1904±161(1678–2060)
Maximum body diameter 37 50±7(40–54)
Head diameter 25 29±2(27–31)
Length of inner labial setae 25 18±1(18–19)
Length of outer labial setae 46 55±4(52–59)
Length of cephalic setae 7 6±1(6–7)
Amphidial fovea width 10 9±1(8–9)
Amphidial fovea height 8 7±0(7–7)
Amphidial fovea from anterior end 29 28±1(27–29)
Body diameter at amphidial fovea 26 30±2(29–33)
Nerve ring from anterior end 114 115±5(108–121)
Body diameter at nerve ring 32 35±3(32–39)
Pharynx length 272 311±10(300–322)
Body diameter at the base of pharynx 32 40±3(35–43)
Anal/cloacal body diameter 29 35±4(31–39)
Spicules length along arc 33
Gubernaculum length 25
Vulva from anterior end 1022±61(941–1077)
Body diameter at vulva 50±7(40–54)
Precloacal supplements 7
V% 53.8±2.3(51.4–56.1)
Tail length 149 185±12(170–195)
a 39.1 38.5±2.6(36.1–42)
b 5.3 6.1±0.4(5.6–6.4)
c 9.7 10.3±0.4(9.9–10.7)
c’ 5.1 5.3±0.2(5–5.5)
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