Oncholaimellus intersexus

Oncholaimellus intersexus	Contents	Rev: 11/12/2023
	Classification
	Morphology and Anatomy	Life Cycle
Return to Oncholaimellus Menu	Economic Importance
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Classification:

Enoplida
Oncholaimoidea
Oncholaimidae: Oncholaimellinae

Oncholaimellus intersexus Neres, Da Silva, Miranda-Junior, Fonseca-Genevois & Esteves, 2014.

Species name based on the presence of one intersex individual among the descvribed specimens.

Synonyms:

Morphology and Anatomy:

Body length 1400-1800um
Cuticle smooth.
Cuticular pores associated with glands, mostly in sublateral region.
Cephalic diameter 49% and 94% of maximum body diameter.
Head set off from body by constriction at level of cephalic setae.
Anterior sensilla arranged according to pattern 6 + (6 + 4): six inner labial papillae, six outer labial setae and four cephalic setae in one circle
Six sclerotized w-shaped structures positioned below inner labial papillae (marginal lamellae?);
Amphids vesicular, occupying region between cephalic setae
Buccal cavity 33.5 um long, divided into two unequal parts by transverse sclerotized band, anterior part smaller.
Three teeth inserted in base of buccal cavity: right ventrosublateral tooth longest (27 um), left ventrosublateral and dorsal teeth equal length (21 um).
Pharynx cylindrical, gradually expanded posteriorly, with smooth wall.
Anterior pharyngeal valve present.
Cardia completely inserted into intestine.
Secretory-excretory pore 221 um from head end. Ventral gland not observed. Nerve ring 185.5 mm from anterior end.

.	Female: Female similar to male. Didelphic, amphidelphic. Vulva lnear mid-body (V=47%) Four glands: two on each side of vulva opening. Vagina sclerotized, surrounded by muscles. Tail conical, 4.7× ABD, distal portion directed ventrally. Male: Diorchic, testes of unequal length, outstretched anteriorly; Spicules slightly curved distally, about 1.8 × ABD. Gubernaculum and bursa absent. Four pairs of setiform papillae surrounding cloaca and two within the circle. Three caudal glands extending anteriorly to cloaca Tail conical (4.5× ABD) with spinnere. Few caudal setae: two pairs of terminal setae The basis for the species name: One intersex was observed with male body characteristics, including spicules but no testes. Female reproductive organs and vulva present. Ref: Neres et al., 2014
Oncholaimellus intersexus A: Male habitus; B: Buccal cavity; C: Anterior sensilla and amphid fovea; D: Cuticular pores; E: Anterior body -nerve ring and secretory-excretory pore); F: Tail and spicules; G: Circumoral setiform papilae Drawings from Neres et al., 2014
Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Free-living nematodes described from ocean bottom sediments (3-919 meter depth) in the Potiguar Basin offshore from States of Rio Grande do Norte and Ceara, Brazil.

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

Neres, P.F., Da Silva, M.C., Miranda-Junior, G.V., Fonseca-Genevois, V., Esteves, A.M. 2014. Five new species of Oncholaimellus (Oncholaimidae: Nematoda) from north-east Brazil, with an emended diagnosis and an updated key to the genus . J. Marine Biol, Assoc. UK 94:703-727.