Chaetonotus (Zonocheta) succinctus Voigt, 1902

Garraffoni, Andre R. S., Araujo, Thiago Q., Lourenco, Anete P. & Balsamo, Maria, 2010, New data on freshwater psammic Gastrotricha from Brazil, ZooKeys 60, pp. 1-12 : 6

Chaetonotus (Zonocheta) succinctus Voigt, 1902 cf. Figs 7-8Table 6

Chaetonotus succinctus - Anderson and Robbins (1980: 226); Kisielewski (1991, 60); Hummon (2007: 6); Weiss (2001: 313); Balsamo et al. (2009: 13, Appendix 1).

Material.

Cabral Mountains:1 specimen; Gouveia:1 specimen; Preto River: 1 specimen.

Description.

The description is based on an adult specimen 201.38 μm in total length. Head with five lobes and two pairs of ciliary tufts. Pharynx 55.48 μm in length from the posterior edge of the mouth to the pharyngo-intestinal junction, lying at U27. On the middle trunk region, a transverse band of five long dorsal spines, all terminally bifurcated, and of equal length (77.6 μm) and thickness. Paired spines at the furca base, not extending beyond the adhesive tube end.

Distribution.

Brazil: Diamantina, Cabral Mountains (Minas Gerais State), Belém ( Pará State); Poland; Romania; England; Italy; Germany; South Korea.

Remarks. Within the subgenus Zonochaeta , four species ( Chaetonotus bisacer , Chaetonotus cestacanthus , Chaetonotus dracunculus , Chaetonotus succinctus )are characterized by the presence of a series of long dorsal spines with concave apices ( Balsamo 1990, 1999). In Brazil, only Chaetonotus succinctus and Chaetonotus bisacer were previously identified( Kisielewski 1991), and the main difference between the two species is the presence of a pair of long spines at the furca base, which extend beyond the adhesive tube tip.