Anokkostenostomum corderoi (Marcus, 1945) 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 : 50-51

Anokkostenostomum corderoi (Marcus, 1945) comb. nov.

( Fig. 4B )

Stenostomum corderoi Marcus, 1945

Description: Solitary individuals, 0.4–0.8 mm long. Two-zooid chains (1.2 mm) to four-zooid chains (2 mm). Body cylindrical, anterior end blunt. Body widening at the level of the oral pore; post-buccal narrowing. Posterior end rounded. The intestine reaches the caudal body region. Small, dorso-lateral ciliated pits; occasionally with creases which make them appear larger. Ciliated epithelium with long semirigid sensory cilia, concentrated especially on the anterior body. The rhabdites are arranged in longitudinal grooves. Live specimens transparent.

Large brain ganglia. Anterior brain lobes separated into small independent masses (‘metamerics’). Posterior lobes with pharyngeal internal and external nerves. No light-refracting bodies.

Oral pore wide, V-shaped, extending to the middle of the pharynx. Pharynx very voluminous (1/3–1/2 of the body length), differentiated into oral (2/3 of its length) and oesophageal regions. A strong sphincter separating the oesophageal region from the intestine. Oral region of the pharynx with scattered large glands (type a) on the musculature. The pharynx is covered by a refringent membrane that broadens at the edges of the mouth. The inner pharyngeal membrane is folded in a zigzag manner in the posterior third of the pharynx (oesophageal region). Intestine with a numerous lateral excretophores, regularly arranged. Nephridiopore terminal.

Distribution: São Paulo, Brazil ( Marcus, 1945b); France ( de Beauchamp 1948).

Figures

Figure 4. A, Anokkostenostomum anatirostrum. B, A. corderoi. C, A. eveline. D, A. membrenosum. Scale bars = 200 Mm.