Chaetonotus cf. persetosus Zelinka, 1889

Chaetonotus cf. persetosus Zelinka, 1889 View in CoL

Figs 2D View Figure 2 , 4D View Figure 4

Locality: PT06, 08 (Fig. 1).

Examined Material: 6 specimens.TL 94–158Μm; FL 5–14 Μm; AL 16–35Μm; PhL 27–60 Μm; MD 6–10 Μm; DR 20–32; TSl 7–12 Μm; TSw 4–12Μm; TSp 20–27Μm; DC 7–12Μm; DSL 8–10 Μm; VC 8; VTSl 7 Μm; VTSw 3 Μm; VR 20–29; VSL 10–11 Μm .

Remarks: Long, slender fusiform habitus. Head five-lobed with large cephalion and dorsolateral epipleura, hypostomium unseen. Mouth subterminal, cylindrical pharynx with subtle posterior bulb and narrow pharyngo-intestinal junction. Cephalic ciliature consists of ciliary tufts inserted between cephalion and pleurae. Head followed by distinct and long neck constriction and trunk wider. Posterior end bears a short U-shaped furca with thin and long adhesive tubes. Posterior sensory bristles inserted on specialized dorsal double-keeled scales anteriorly to furcal base. The dorsal body surface is covered by 7 intercalated columns of 20 spined arrow-head-shaped trilobed scales, with a concave posterior edge. Each spine is ornate with a denticle at ¾ of its total length from the base. Scales on head and neck are smaller than dorsal trunk scales. Ventrolateral row of scales along the ciliary band with a long simple spine with blade-like lamellae on the inner edge. The ventral furcal branch is armed with one pair of slen- der keeled scales. The general morphology of the specimens fits the original description, however the precise shape of the ventral cuticular ornamentation was indeterminable.

Distribution: Bulgaria ( Valkanov 1937), Denmark ( Grilli et al. 2010), France ( d’Hondt 1971), Germany ( Schwank 1990), Great Britain ( Martin 1981), Italy ( Balsamo 1983), Poland ( Kisielewski and Kisielewska 1986), Romania ( Rudescu 1967), Russia ( Preobrajenskaja 1926), Japan ( Saito 1937), Korea ( Lee and Chang 2000); Sweden ( Kånneby 2011), Brazil: Iguape (SP) ( Kisielewski 1991) and Casa Nova, Chorrochó (BA) (present study).