Taxonomy of Stilbonematinae (Nematoda: Desmodoridae): description of two new and three known species and phylogenetic relationships within the family Author Armenteros, Maickel Author Ruiz-Abierno, Alexei Author Decraemer, Wilfrida text Zoological Journal of the Linnean Society 2014 Zool. J. Linn. Soc. 2014-04-25 171 1 1 21 http://dx.doi.org/10.1111/zoj.12126 journal article 10.1111/zoj.12126 0024-4082 4890548 AD7CEB9C-3B04-4A87-95BD-A52BA38B1350 ROBBEA POROSUM ( HOPPER & CEFALU, 1973 ) TCHESUNOV, 2013 Measurements: Table 1 ; Figures 7 , 8 . Material examined: Five ♂ , one ♀ , two J. Description: Body habitus filiform. Cuticle finely striated (annuli ∼0.3 μm width), covered by coccoid bacteria and mucus (also adhered to the setae). Head capsule weak marked by thickening of the cuticle, revealing in SEM photographs a pattern-like fingerprint anteriorly and fine transverse striations posteriorly, surrounding the amphidial fovea; six lips partially fused, each provided with an inner labial papilla, and surrounded by a differentiated collar; six outer labial papillae (∼1 μm long) at border of labial region. Four cephalic sensilla setiform (11–14 μm long) at level of outer labial sensilla. Four shorter subcephalic setae at anterior level of amphidial fovea (7–8 μm long): two subdorsal and two subventral. Additional four subcephalic setae (5–8 μm long) flanking posteriorly the fovea. Eight longitudinal rows of short setae connected to epidermal glands (1–2 μm long) running along the body length. Amphidial fovea spiral, lateral, and far anteriorly on the head, diameter approximately 0.5 c.b.d. Pharynx divided into three portions, an anterior muscular corpus with sclerotized lumen, a narrow isthmus, and a posterior bulb with glandular aspect and lumen nonsclerotized; cardia rounded and inconspicuous. Tail conical, striations extending subterminally, tail tip rounded. Males with spicules paired, blade ventrally curved and marked capitulum; gubernaculum with relatively large dorsally orientated caudal apophysis; neither precloacal nor postcloacal supplements. Figure 6. Leptonemella brevipharynx sp. nov. A, anterior region, specimen 1 (indeterminate sex); B, head (frontal view), specimen 2 (indeterminate sex); C, head (lateral view), specimen 2 (indeterminate sex); D, mid-body with coccoid-shaped bacteria, specimen 1 (indeterminate sex); E, tail region with coccoid-shape bacteria, specimen 2 (indeterminate sex); F, spinneret aperture, specimen 2 (indeterminate sex). Female didelphic, ovaries antidromously reflexed, vulva at mid-body position, no other features could be ascertained because of the strong coiling of the single female examined. Remarks: Robbea porosum has recently been transferred from the genus Catanema to Robbea based on its large, spirally coiled amphidial fovea in lateral position ( Tchesunov, 2013 ). The fingerprint pattern in the head capsule appears to be a diagnostic feature in this species as it has not been recorded for the other five known species of the genus. The arrangement of the bacterial coat could not be ascertained because in most of the specimens the bacteria were detached from the host upon processing. Several specimens of R. porosum had the intestine full of bacteria, support- ing the hypothesis that the latter serve as a food source for the nematode.