Chaetonotus majestuosus Grosso & Drahg, 1984

Chaetonotus majestuosus Grosso & Drahg, 1984 View in CoL

Fig. 2B View Figure 2

Locality: PT06, 07, 09 (Fig. 1).

Examined Material: 9 specimens. TL 88–181 Μm; FL 8–26 Μm; AL 14–29 Μm; PhL 22–55 Μm; MD 6–16 Μm; DR 24–38; TSl 5–12 Μm; TSw 3–9 Μm; TSp 6–48 Μm; DC 7; DSL 14–27 Μm; VTSl 11–20 Μm; VTSw 3–9 Μm .

Remarks: Long, slender, fusiform habitus. Head clearly five-lobed with a large round cephalion, large dorsolateral oval epipleura with edges free and highly raised, and small ventrolateral sub-triangular hypopleura. Trapezoid hypostomium posteriorly adjacent to the mouth, with a pair of rodlike cuticular reinforcements. Mouth subterminal, straight and cylindrical pharynx, and narrow pharyngo-intestinal junction. Cephalic ciliature consists of dorsolateral pairs of ciliary tufts inserted between cephalion and epipleura, lateral tuft inserted between epipleura and hypopleura, with no particularly longer cilia. Head delimited from trunk by subtle neck constriction. Posterior end bears a short furca with thin adhesive tubes curved inward. No sensory bristles were seen. The dorsal surface is covered by 7 columns of 24 intercalated sub-pentagonal scales with a long single-barbed spine. Dorsal head and neck scales are smaller and progressively enlarging toward the trunk. Interciliary area delimited by two ciliary bands adjoining each other posteriorly to the hypostomium, covered by 6 alternated columns of longer spined scales, and the furcal branch is armed with two pairs of slender scales with extremely thin and long simple spines. Present specimens fit the original description within the range of morphological variance and morphometric measurements.

Distribution: Argentina ( Grosso and Drahg 1986), Brazil: Casa Nova, Abaré (BA), and Delmiro Gouveia (AL; present study).