. Bulletin of the Natural History Museum Zoology. ^ * m ^ Fig. 27 H. estigmena from C. limbatus. Heteromorphous basal armature, bothridial surface. Scale bar=10 urn. Fig. 28 H. estigmena from C. limbatus. Heteromorphous metabasal armature, antibothridial surface. Scale bar=10 urn. depending on contraction (anterior segments: 80 x 330-20 x 520), final segments 300-370 x 860-880; testes 33-55 in diameter. Remarks. The present specimens are most similar to H. alloiotica, H. punctatissima and H. estigmena, which were considered as belonging to subgroup IIAa by Palm et al. (1997), comprising specie
. Bulletin of the Natural History Museum Zoology. ^ * m ^ Fig. 27 H. estigmena from C. limbatus. Heteromorphous basal armature, bothridial surface. Scale bar=10 urn. Fig. 28 H. estigmena from C. limbatus. Heteromorphous metabasal armature, antibothridial surface. Scale bar=10 urn. depending on contraction (anterior segments: 80 x 330-20 x 520), final segments 300-370 x 860-880; testes 33-55 in diameter. Remarks. The present specimens are most similar to H. alloiotica, H. punctatissima and H. estigmena, which were considered as belonging to subgroup IIAa by Palm et al. (1997), comprising species having a heteromorphous tentacular armature with hooks diminishing in size towards the basal part of the tentacle, and no characteristic basal armature. Dollfus (1960) described 6 species, H. dakari, H. estigmena, H. punctatissima, H. senegalensis, H. alloiotica and H. cadenati, with a heteromorphous tentacular armature and small hooks of about 10-11 urn (bothridial) and 8 um (antibothridial). All these species have a very similar scolex and hook morphology, mainly differing from each other by a different bulb ratio and different scolex proportions. Palm & Walter (1999) proposed the synonymy of Nybelinia dakari Dollfus, 1960 with H. perideraeus, differing from the other species in having a basal armature of similar size to the metabasal armature. Though Dollfus (1960) stated that the bulb ratio of H. dakari was small (about :1), his drawing (figure 43) indicates a ratio of about 4. His bulb measurements of x mm are faulty ( might stand for ), which would also indicate a bulb ratio of about , thus, corresponding to the ratio of H. perideraeus (see Palm & Walter, 1999). H. senegalensis, H. alloiotica and H. cadenati also have a bulb ratio of about 4, and H. punctatissima differs from H. estigmena by having a slightly different bulb ratio and different scolex dimen- sions (:1 vs :1:1). However, these two species appear to b
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