Pseudaraeolaimus cylindricauda ( Allgén, 1932 ) Holovachov, Oleksandr, 2017

Holovachov, Oleksandr, 2017, Belgopeltula belgica (Vincx & Gourbault, 1992) gen. et comb. nov. and Mudwigglus micramphidium sp. nov. from the west coast of Sweden, and reappraisal of the genus Pseudaraeolaimus Chitwood, 1951 (Nematoda: Araeolaimida: Diplopeltidae), European Journal of Taxonomy 383, pp. 1-21 : 14-15

Pseudaraeolaimus cylindricauda ( Allgén, 1932) comb. nov.

Fig. 4 ; Table 1

Diagnosis

Pseudaraeolaimus cylindricauda comb. nov. is characterised by a body of 1 mm long; cephalic sensilla 7 µm long; amphidial fovea an inverted U-shape, 11 µm long and 3.5 µm wide; two pairs of cervical setae at level with amphidial fovea and 4–5 pairs at level with midpharynx; ocelli absent; tail subcylindrical; spicules 17 µm long.

Material examined

NEW ZEALAND: Campbell Island: lectotype ♂ ( SMNH Type-3435).

Description

Adult male

Body cylindrical, tapering posteriorly in the tail region, strongly ventrally curved upon fixation. Cuticle finely striated along the entire body, striae without longitudinal incisures or any other ornamentation visible under the light microscope. Somatic setae (except cervical setae, see below) are indistinct. Labial region truncate conoid; lips fused. Inner and outer labial sensilla not observed. Cephalic sensilla setiform, equal to 1.3 labial region diameters in length, their bases are located 1.5 µm from anterior end. Amphidial fovea an inverted U-shape with its dorsal branch slightly longer (11 µm) than ventral branch (10.5 µm). Amphidial fovea length (longest) to width ratio is 3.1. Narrow space between amphidial branches not refractive and not ornamented. Stoma very small, undifferentiated, its lining is uniform with the lining of the pharynx. Pharynx poorly preserved, cylindrical along most of its length. Pharyngeal glands and nuclei indistinct. Nerve ring encircling pharynx at posterior third of its length. Secretory-excretory system present; renette cell located opposite to the ventral side of the and anterior part of the intestine; secretoryexcretory pore opens to the exterior at level with the amphid. Reproductive system diorchic; anterior testis outstretched, posterior testis outstretched, with posteriorly reflexed terminal section of the germinal zone. Spicules paired and symmetrical, arcuate, with rounded manubrium and conoid shaft. Gubernaculum present, plate-like and without apophyses. Male accessory apparatus composed of single midventral precloacal papilliform sensillum. Tail subcylindrical. Caudal glands obscure, spinneret present.

Female

Not available.

Figures

Fig. 4. Pseudaraeolaimus cylindricauda (Allgén, 1932) comb. nov. lectotype male (SMNH Type-3435). A. Anterior end. B. Posterior end. Scale bar = 20 µm.