Chaetonotus dadayi Schwank, 1990

Chaetonotus dadayi Schwank, 1990 View in CoL

Figs 2A View Figure 2 , 5E–F View Figure 5

Locality: PT06, 09, 10 (Fig. 1).

Examined Material: 3 specimens TL 88–155 Μm; FL 8–9 Μm; AL 23–24 Μm; PhL 34–43 Μm; MD 6–11 Μm; DR 27–28; TSl 6–12 Μm; TSw 3Μm; TSp 28–48 Μm; DC 7; DSL 18–27 Μm .

Remarks: Short, stompy, tempin-shaped habitus. Head clearly five-lobed with a trapezoid cephalion, small dorsolateral epipleura, and ventrolateral hypopleura. Small transversal hypostomium posteriorly adjacent to the mouth. Mouth subterminal, cylindrical wide pharynx with large pharyngo-intestinal junction. Cephalic ciliature consists of dorsolateral pairs of ciliary tufts inserted between the cephalion and epipleura, a lateral tuft inserted between epipleura and hypopleura, with no particularly longer cilia. Head and neck with the same width and trunk widens posteriorly. Posterior end bears a short V-shaped furca with thin adhesive tubes, distally subtly swollen. No sensory bristles were seen. The dorsal surface is covered by hemielliptical scales posteriorly concave with a long single-barbed spine and anterior double-edge. Dorsal scales increase in size from the anterior to the middle body region and subsequently decrease toward the rear. Ventrolateral scales with similar shape increase in size along the body. Interciliary area delimited by two ciliary bands converging anteriorly, covered by rounded and unilobed scales with increasing length along the body. Four rounded scales at the ventral furca, and a pair of single-lobed oval scales medial to the furca. Present specimens fit the original description within the range of morphological variance and morphometric measurements from subsequent reports found in the literature.

Distribution: Paraguay ( Daday 1905), French Guiana ( d’Hondt et al. 2006), Brazil: JundiaÍ (SP) ( Guidetti et al. 2021), PaulÍnia ( São Paulo: SP), Santo André (SP), Diamantina ( Minas Gerais: MG) ( Salgado et al. 2022), Casa Nova (BA), and Delmiro Gouveia (AL) (present study).