Haltidytes crassus ( Greuter, 1917 )

Kånneby, Tobias, 2011, New species and new records of freshwater Chaetonotida (Gastrotricha) from Sweden, Zootaxa 3115, pp. 29-55 : 50

Haltidytes crassus ( Greuter, 1917)

( Figure 17 )

Localities. Artificial pond, Nybro, Småland (N 56º 44’ 89’’; E 15º 54’ 27’’).

Material. 4 specimens. TL, 97–130 µm; PhL, 35–40 µm; DSL, 100–120 µm; VSL, 120–162 µm.

This species is characterized by three pairs of ventral spines; the posterior pair is the longest. Dorsally five pairs of spines are present; the anterior three pairs originate ventrolaterally while the posterior two pairs originate from the ventral side. Interciliary area naked. Locomotory ciliation in two longitudinal bands, each band further divided into tufts, and three semi-circular bands on the head. The Swedish specimens correspond well to the specimens found in Poland ( Kisielewski, 1981) and Denmark ( Grilli et al., 2010).

Previously reported from Italy ( Balsamo & Tongiorgi 1995), Romania ( Rudescu 1967), Russia ( Preobrajenskaja 1926; Tretjakova 1991), Switzerland ( Greuter 1917), Denmark ( Grilli et al. 2010), Canada ( Schwank 1990), Brazil ( Kisielewski 1991) and Argentina ( Grosso 1973; Grosso & Drahg 1983).

Figures

FIGURE 17. Haltidytes crassus. A) Dorsal view. B) Ventral view showing insertion of spines. Scale bars: A and B, 20 µm.