Anokkostenostomum evelinae (Marcus, 1945), 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 evelinae (Marcus, 1945) comb. nov.

( Fig. 4C )

Stenostomum evelinae Marcus, 1945

Description: Length of simple specimens, 1.2 mm. Two-zooid chains 2 mm long. Body compact, dorsoventrally flattened. Anterior end rounded. Short lateral ciliated pits placed near the apical end of the body. Posterior end gradually tapering. Ciliated epithelium with long sensory cilia, concentrated mainly in the anterior and posterior ends. Small rhabdites. Colour white, with yellow intestine in live specimens.

Short, compact brain ganglia. Solid anterior lobes and reduced posterior lobes. No light-refracting bodies.

Small oral pore, longer than it is wide, its posterior end widening. Presence of radial musculature. Large, wide pharynx. Well-developed circular and parietal pharyngeal musculature. Strong pharyngeal sphincter. Well-developed pharyngeal glands (type a) in the anterior region. Presence of a caecum dorsal to the pharynx. Lateral excretophores, irregularly arranged in the anterior region, and posteriorly regular. Nephridiopore terminal.

Distribution: São Paulo, Brazil ( Marcus, 1945b); near Paramaibo, Surinam ( Van der Land, 1970).

Figures

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