Chaetonotus cf. oculifer Kisielewski, 1981

Chaetonotus cf. oculifer Kisielewski, 1981 View in CoL

Fig. 2C View Figure 2

Locality: PT09, 10 (Fig. 1).

Examined Material: 4 specimens TL 109–133 Μm; FL 10–11 Μm; AL 14–17 Μm; PhL 28–43 Μm; MD 8–11 Μm; DR 28–33; TSl 7 Μm; TSw 5 Μm; TSp 13 Μm; DC 9; DSL 13 Μm; VTSl 8 Μm; VTSw 3 Μm .

Remarks: Small, compact fusiform habitus. Head five-lobed with rectangular cephalion and dorsolateral epipleura, and ventrolateral hypopleura, hypostomium unseen. Mouth subterminal, cylindrical pharynx with narrow pharyngo-intestinal junction. Cephalic ciliature consists of dorsolateral pairs of ciliary tufts inserted between cephalion and epipleura, with no particularly longer cilia. Head followed by subtle neck constriction, and trunk slightly wider. Posterior end bears a short U-shaped furca with short thick adhesive tubes. No sensory bristles were seen. The dorsal surface is covered by nine intercalated columns of 28 simple short-spined scales. Scales on the head and neck are smaller than dorsal trunks, as well as each spine. Interciliary area cuticle is naked, with two parallel columns of smaller ventrolateral scales adjacent to ciliary bands. Ventral surface of the furcal branch is medially armed with one pair of keeled scales, while there is a pair of scales with stronger spines dorsolaterally to each adhesive tube. The general morphology of the specimens fits the original description, however the precise shape of the dorsal dorsal scales was hardly determinable.

Distribution: France ( Grilli et al., 2008), Poland ( Kisielewski 1981, 1986), Canada ( Schwank 1990), Great Britain ( Martin 1990), Russia ( Tretjakova 1989), Sweden ( Kånneby 2013; Kånneby et al. 2009), Brazil: Iguape (SP) ( Kisielewski 1991) and Delmiro Gouveia (AL;) present study).