Pseudelzalia longiseta Yu & Xu 2014, sp. nov.
Creators: name: Yu, Tingting
name: Xu, Kuidong
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Chromadorea
Monhysterida
Xyalidae
Pseudelzalia
Pseudelzalia longiseta

description: Pseudelzalia longiseta sp. nov.
(Figures 1A–D, 3A–D, Table 1)
Diagnosis
Body length about 647–853 μm. Buccal cavity cuticularized, occupying about half of head diameter. Ten cephalic setae, 2–4 μm long. Amphids circular, 3–6 μm across. Cervical setae 7–8 μm long and caudal setae 11–14 μm long. Spicules 25–41 μm long and 2.1–2.7 a.b.d. Tail conico-cylindrical with pointed tip, about 96–121 μm long and 7.7–9.7 a.b.d.
Type material
Four males and two females were available for measurement and description.
Holotype. One male on slide CJ-4-24.
Paratypes. Three males on slides DH1-8-02, DH2-7-07 and DH2-7-11. Two females on slide DH2-7-08.
Type locality and habitats
Muddy sediments at Stations CJ-4 (32°11' N, 123°59' E) and DH1-8 (32°00' N, 125° 59' E) DH2-7 (31°01' N, 126°00' E) in the East China Sea. Station CJ-4, water depth 42 m, water temperature at the sediment–water interface 20.9°C, salinity 31.3, median particle diameter 127 μm, silt-clay 43.4%, organic matter 0.5%; Station DH 1-8, water depth 84 m, water temperature at the sediment–water interface 11.8°C, salinity 33.3, median particle diameter 6 μm, silt-clay 100%, organic matter content 1.2%; Station DH 2-7, water depth 70.6 m, water temperature at the sediment–water interface 13.4°C, salinity 33.6, median particle diameter 8 μm, silt-clay 93.6%, organic matter content 1.0 %.
Note: CV, coefficient of variation in %; Max, maximum; Min, minimum; SD, standard deviation; -, absent.
Etymology
Composition of the Latin adjective longus (long) and the Latin noun seta (bristle), referring to the long somatic setae in the cervical and tail region of the species.
Description
Males. Body cylindrical and gradually tapering towards tail end, with head region slightly narrower than body trunk; 733–853 μm long and 13–17 μm wide at maximum body diameter. Head 7–9 μm wide. Cuticle faintly striated. Many somatic setae 7– 8 μm long in cervical region (just behind the amphids) and 11–14 μm long in tail region, where the setae are slightly thicker (Figure 1D).
Buccal cavity cylindrical, cuticularized wall, about 6.3 μm deep and 3.8 μm wide, occupying about half of the head width (Figure 1B). Six labial papillae, 10 cephalic setae in one circle, of equal length, 3–4 μm long and 21–56% of head diameter.
Amphidial fovea round, 5–6 μm in diameter and 52–60% of corresponding body diameter, anterior border of fovea 8–13 μm from anterior body end. Pharynx cylindrical, 113–140 μm long, occupying 15–17% of total body length. Pharyngo-intestinal junction with small, half-moon shaped cardia, not embedded in intestine. Nerve ring located in the middle portion of pharynx, 56–68 μm from anterior body end.
Excretory pore and ventral gland not observed.
Tail devoid of terminal setae, conico-cylindrical and tapered at terminal end, 103– 121 μm long and 7.7–9.7 a.b.d.; cylindrical part occupying about one-third of tail length. Three caudal glands (Figure 1A).
Single outstretched testis to the right of intestine. Paired, slender and arcuate spicules, 25–41 μm long and 2.1–2.7 a.b.d. Gubernaculum composed of four parts: the ventral thin piece about 11 μm long, the longer dorsal thin piece about 18 μm long, the shorter dorsal thin piece about 14 μm long, and the ventral main part with several conical projections (Figure 1C). Precloacal supplements not seen.
Females. Similar to males, but with slightly smaller body (647–670 μm versus 733– 853 μm) and amphids (3–5 μm versus 5–6 μm). A single anteriorly outstretched ovary to the left of intestine, about 155 μm long. Vulva located at posterior two-fifths of the body, about 388 μm to anterior body end.
description: Published as part of Yu, Tingting & Xu, Kuidong, 2014, Two new nematodes, Pseudelzalia longiseta gen. nov., sp. nov. and Paramonohystera sinica sp. nov. (Monhysterida: Xyalidae), from sediment in the East China Sea, pp. 509-526 in Journal of Natural History 49 (9) on pages 511-514, DOI: 10.1080/00222933.2014.953224, http://zenodo.org/record/4003991