Sabatieria spiculata, Botelho, Alessandra Prates, Silva, Maria Cristina Da, Esteves, André Morgado & Fonsêca-Genevois, Verônica, 2007

Botelho, Alessandra Prates, Silva, Maria Cristina Da, Esteves, André Morgado & Fonsêca-Genevois, Verônica, 2007, Four new species of Sabatieria Rouville, 1903 (Nematoda, Comesomatidae) from the Continental Slope of Atlantic Southeast, Zootaxa 1402, pp. 39-57 : 42-45

Sabatieria spiculata sp.nov. (figure 2 and 3)

Description

Studied material: 6 male; 4 female

Type material: Male hollotype MNRJ 305; female allotype MNRJ 306; 5 males 46–50 NM LMZOO­ UFPE; Three females 51–53 NM LMZOOUFPE.

Type locality: Campos Basin (Rio de Janeiro, Pernambuco, Brazil). It was found at 750 and 1650 meters depth, in silt­clay sediments.

Measurements: see table 2.

Etymology: The specific name spiculata refers to the long and sligth spicule.

Male:

Cylindrical body, medium­sized, tail short with cylindro­conical shape. Punctated cuticle with transversal rows of dots and lateral differentiation with larger and wider spaced punctations, specially in the tail region. Rounded and attenuated head with anterior sensilla arranged in three crowns: six minute internal labial sensilla, six external labial setae and four cephalic setae. Somatic setae, short.. Amphidial fovea spiral, with three turns. Buccal cavity cup­shaped, with diminute dorsal teeth. Pharynx clavate, gradually expanding towards to the posterior end, but without distinct bulb. Cardia short, pear shaped. Nerve ring slender located at the middle of pharynx and anterior to secretory­excretory pore. Ventral gland opposite posterior end of pharynx and beginning of intestine; system diorchic; opposed and outstretched testes. Anterior testis situated on the left of the intestine and the posterior one on the right side. Spicule paired with the same length equally wide and slightly curved ventrally; proximal half with mid­septum (each spicule has inside the core sensilla). Several glandular cells are arranged around the spicules. Small gubernaculum with narrow apophysis. Minute porelike precolacal supplements and precloacal setae. Spermatozoa oval, elongated, showing some striation. Conical tail with three caudal glands, ending in a spinneret. Two caudal setae.

TABLE 2. Measurements (µm) of Sabatieria spiculata sp.nov.

Female:

Females are quite similar to males, although some minor morphological differences are observed. Total body length and head diameter similar to males. Amphidial fovea spiral with three turns. Buccal cavity cupshaped with minute dorsal tooth. Pharynx clavate. Nerve ring situated at the middle of pharynx. Secretoryexcretory pore somewhat more posterior than in male. Reproductive system didelphic­amphidelphic, with outstretched ovaries. Egg proximal to vagina in the anterior part of uterus. Vulva at mid­body. Vagina thinwalled; pars proximalis vaginae (= vagina uterina) surrounded by a constrictor muscle. Dilators vaginae extending from the uterus wall opposite the vagina towards the subdorsal body wall. Finely granular vaginal glands present at the pars distalis vaginae (figure 2C). Tail conical with three caudal glands ending in a spinneret. Posterior end of tail with two short somatic setae.

Diagnosis

S. spiculata sp.nov. is characterised by a minute dorsal tooth; 10–14 pore­like precloacal supplements; narrow spicules with 53–62µm; tail conical (70–94 µm).

Relationships

S. spiculata sp.nov. resembles S.conicauda Vitiello 1970 and S. dorylaimopsoides Allgén 1959 in the shape of head, tail, spicule and supplements. Can be distinguished from S.conicauda by the total lenght (L= 1051–1153 ɗ and 1153 Ψ), number of supplements (7–8) and non armed buccal cavity. Difers from S.dorylaimopsoides by the thorn in buccal cavity and the reproductive system in female with reflexed ovaries.