Anokkostenostomum pegephilum ( Nuttycombe & Waters, 1938 ) Noreña & Damborenea & Brusa, 2005

Noreña, Carolina, Damborenea, Cristina & Brusa, Francisco, 2005, A taxonomic revision of South American species of the genus Stenostomum O. Schmidt (Platyhelminthes: Catenulida) based on morphological characters, Zoological Journal of the Linnean Society 144 (1), pp. 37-58 : 52

Anokkostenostomum pegephilum ( Nuttycombe & Waters, 1938) comb. nov.

( Fig. 5A )

Stenostomum pegephilum Nuttycombe & Waters, 1938

Description: Solitary specimens: 0.26 mm long. Chains with two zooids (0.8 mm) up to 5–6 zooids (2 mm). Slight ventral flattening. Anterior end narrowing abruptly. Apical zone blunt. Long ciliated pits. Intestine-lacking region at the posterior end. Conspicuous ciliated epithelium. Irregularly arranged sensory cilia, more abundant in the anterior end. Epidermis with small rhabdites. Colour in life whitish.

The anterior brain lobes form independent masses (‘metameric’). No light-refracting bodies.

Oral pore transverse. Pharynx short, with radial musculature and small rounded glands (type a), which open onto its entire surface. A muscular sphincter separating the pharynx from the intestine. Irregularly arranged excretophores. Conspicuous sinuous protonephridium. Nephridiopore terminal.

Distribution: Mountain Lake, Virginia, USA ( Nuttycombe & Waters, 1938); Tieté River, São Paulo, Brazil ( Marcus, 1945b); Germany, Poland ( Lanfranchi & Papi, 1978); Fosso Contesora, Italy ( Kolasa, 1983); south of New York State, USA ( Kolasa et al., 1987; Kolasa, 1991).

Figures

Figure 5. A, Anokkostenostomum pegephilum. B, A. pseudoacetabulum. C, A. saliens. D, A. tuberculosum. E, A. ventronephrium. Scale bars = 100 Mm.