Sabatieria sanjosensis, Pastor, Catalina T. & Ward, De, 2003

Pastor, Catalina T. & Ward, De, 2003, Two new species of Sabatieria (Nematoda, Comesomatidae) from Golfo Nuevo, Chubut (Argentina), Zootaxa 172, pp. 1-12 : 8-11

Sabatieria sanjosensis sp. n. ( Figs. 3 A­G; Plate 2 A­M; Table 3 )

Type material: Four males, two females and three juveniles on slide numbers: 1 HOLO­ TYPE, MACN N1 34629; 1 ALLOTYPE, MACN N1 34630; PARATYPES, MACN N1 34632­34638. Col.: Lic. H. Zaixso.

Type locality: San José Gulf, Chubut province, Argentina. STATION S: S18: (2); S33: (2, 3, 4); S34: (1), (1), juv. (1, 2); S35: juv.(3).

Habitat: Sabatieria sanjosensis sp. n. was found in very fine sand (median grain size 65­72 µm), 53­59 m depth, from San José Gulf ( Fig. 1 ).

Etymolog y: From the Spanish word "San José", in reference to the area where it was found.

Measurement s: see Table 3 .

Description.Males: Body cylindrical, tapers slightly towards the anterior end and has a filiform tail end. Cuticle annulated and punctuated. The small punctuations are arranged in transverse rows with lateral differentiations, having larger dots regularly arranged on the lateral fields. Six inner small labial papillae, 6 outer labial setae 0.5 µm long and 4 cephalic setae 4­5 µm long. Cervical region without somatic setae. Amphids spiralled ventrally towards the centre, with two and a half turns, located at 5 µm from anterior end; 7 µm in diameter (50% bda). Stoma cup shaped, the pharyngeal muscles surround the posterior part of the stoma. Pharynx cylindrical (177­210 µm long), posteriorly enlarged. Cardia is small. Ventral gland located at the cardia level and opens through an ampulla at 100­136 µm from anterior end. Reproductive system is diorchic, with opposed and outstretched testes, anterior left and posterior right of the intestine. Spicules curved 40 µm (1.3 abd) in chord length. The proximal end has a central cuticularized internal projection, 5 µm long. Gubernaculum formed by one central basal piece 7 µm long, two straight dorso­caudally oriented 24 µm (0.8 abd) apophyses and a distal triangular plate with a lateral alae 10 µm long. Glandular tissue observed situated between spicula and gubernaculum. There is a pair of short pre­cloacal setae 10 µm from the cloaca and 16 (15­17) weakly cuticularised pre­cloacal supplements present. Tail 210 µm long (7.0 abd), with long (50%) cylindrical end. There are three caudal glands.

Females: Females are similar to males in general body shape, anterior sensilla, amphids and cuticle. Ovaries opposed, outstretched, anterior left and posterior right of the intestine. Tail 140 µm (3.7 abd).

Discussion. Sabatieria sanjosensis sp n. is characterized by the body length, values of a and tail shape. This new species should be included in the S. praedatrix – group following Platt (1985). Sabatieria sanjosensis sp n. resembles S. paradoxa Wieser & Hopper, 1967 and S. granifer Wieser, 1954 , in head and amphid shape. It can be distinguished from both species by a larger body and spicular % and shorter tail length (in S. paradox a: L=1460­1660; Spic%=1.7­1.8; T= 4.0 and in S. granifer : L= 1765­2620; Spic=1.5­1.6; T= 3.3­4.8). Sabatieria sanjosensis sp n. also resembles S. praedatrix in body length, A% and the number of pre­cloacal supplements and it can be further distinguished by a smaller value of HD, larger R3 value, smaller spicular length and longer tail, in S. praedatrix (HD=40; R3=47­50; spic%= 1.5­1.8; T=4­4.5).

Sabatieria sanjosensis sp n. also resembles S. alata in tail length and A% value. It can be distinguished by a slightly shorter body length, much larger value of a, R3 values, longer spicular length and fewer pre­cloacal supplements (in S. alat a: L= 3070­3220; a= 36­53; Hd= 32; R3 = 30; spic%= 1.6­1.8; PS= 21).

PLATE 2: Sabatieria sanjosensis sp. n. A. Entire male; B. Entire female; C. Lateral punctuations; D. Buccal cavity of male; E. Amphid of male; F. Female anterior end; G. Tail of female; H. Gland between spicules; I. Cephalization of spicules; J. Excretory gland of male; K. Tail of male; L. Vulva and uterus; M. Copulatory apparatus.

HOLOTYPE PARATYPE ALLOTYPE PARATYPE JUVENILES

Male Males n= 4 (*) Female Females n= 2 n=3

Figures

FIGURE 1: Map of the San José and San Matías Gulfs showing the sampling stations.

FIGURE 3: Sabatieria sanjosensis sp. n. A. Anterior end of male paratype; B. Head of male holotype; C. Tail of female allotype; D. Tail of male holotype; E Posterior end of male paratype;. F. Copulatory apparatus of male holotype. Scales: 1 = C, G; 2 = A, B, D, E, F.