. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 54/2007. FIG. 18. Moorebdellina rugosa, lateral view. Posterior sucker: medium sized, centrally attached, facing directly posteriorly, ocelli absent. Digestive system. Esophageal diverticula present or absent. Crop chambers developed in varying de- grees, without lateral processes. Posterior crop caeca nontotally fused with 5 fenestrae without lateral pro- cesses. Intestinal chambers varying in their develop- ment, lateral processes present or absent. Rectum varying in its development. Reproductive system. Four to
. Bonner zoologische Monographien. Zoology. BONNER ZOOLOGISCHE MONOGRAPHIEN Nr. 54/2007. FIG. 18. Moorebdellina rugosa, lateral view. Posterior sucker: medium sized, centrally attached, facing directly posteriorly, ocelli absent. Digestive system. Esophageal diverticula present or absent. Crop chambers developed in varying de- grees, without lateral processes. Posterior crop caeca nontotally fused with 5 fenestrae without lateral pro- cesses. Intestinal chambers varying in their develop- ment, lateral processes present or absent. Rectum varying in its development. Reproductive system. Four to six pairs of testisacs. Seminal reservoirs long, loop-like. Common parts not great. Accessory glandular mass small, covering pos- terior surface of common part of ejaculatory ducts. Bursa short or long. Ovisacs not extending posterior to ganglion 8. Conductive tissue present. Copulatory area absent. Coelomic system. Dorsal, ventral, lateral, mar- ginal, and testicular lacunae present. Main and ac- cessory connections present. Small pulsatile vesicles (dilations of marginal lacunae) located at site of connection with lateral lacuna. Host data: only one specimen was collected from Pycnogonida. Distribution (Fig. 16): Atlantic, Indian and Pa- cific sector of Antarctic region. Congenitors: M. biannulata Moore, 1957; M. uschakovi Epstein, 1974; M. meyeri , 1997. Found only in Antarctic region. References: Moore 1938, Epshtein 1972, Sawyer 1986, Utevsky 2000. Key to the Species of the Genus Moorebdellina la Complete somite 2-annulate M. biannulata (p. 34) lb Complete somite more than 2-annulate ... 2 2a Complete somite 4-annulate; Al with 6 pa- pillae; Aj, Bs, Bö with 8 papillae M. rugosa (p. 32) 2b Complete somite 3-annulate 3 3a Annuli Ai and A3 with many small tubercles, A2 with 4 papillae M. uschakovi (p. 36) 3b Annulus A] with 6 papillae, A?, and A3 with 8 papillae M. meyeri (p. 38) Moorebdellina rugosa (Moore, 1938) (Syn. Pontobdella rugosa Moore, 1938) 1. External ch
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