Ivanov, V.A., Campbell, R.A. (1998). Echinobothrium californiense n. sp. (Cestoda: Diphyllidea) from the thornback ray Platyrhinoidis triseriata (Chondrichthyes: Rajoidei) and a key to the species in the genus. Syst. Parasitol. 40, 49–54.

198336

Ivanov, V.A., Campbell, R.A.

1998

40, 49–54.

Publication

A new cestode, Echinobothrium californiense n. sp., from the spiral intestine of Platyrhinoidis triseriata, taken in California waters is described. The new species is distinguished from all other species of Echinobothrium by a rostellar armature consisting of 2 apical groups of 20–22 large hooks each, a continuous row of 19–24 hooklets on each lateral surface, 8 rows of 6–7 spines each on the cephalic peduncle, 4–9 segments and 8–11 testes per segment. The new species is most similar to E. coronatum, E. helmymohamedi, E. longicolle, E. acanthocolle and E. pigmentatum. E. californiense can be differentiated from E. coronatum in having fewer spines per row on the cephalic peduncle (32 in E. coronatum), and fewer lateral hooklets (28). It differs from E. helmymohamedi in the number of lateral hooklets (0 in E. helmymohamedi), number of spines per row on the cephalic peduncle (10–12) and number of testes (12–15), and also from E. longicolle in the presence of lateral hooklets (0 in E. longicolle), number of spines per row on the cephalic peduncle (180) and in the number of testes (26–30). E. acanthocolle can be distinguished from the new species in the number of large apical hooks (24 in E. acanthocolle), absence of lateral hooklets and number of testes (23–25). Finally, E. californiense is most similar to E. pigmentatum, in having a similar combination of number of large apical hooks (20–22) and lateral hooklets (19–24 vs. 20–22 in a continuous row), but differs in the number of spines per row in the cephalic peduncle (6–7 vs 9–13 in E. pigmentatum), number of testes (8–11 vs 5–7), body length (1.5–4.5 vs 0.9–1.4~mm), mm), "="?mm), -> ?~number of segments (4–9 vs 3–4), ratio of bothridial length to cephalic peduncle length (1:0.53–0.61 vs 1:1.24–1.71), a notched posterior margin of the bothridium and in the possession of an internal seminal vesicle. E. californiense can also be clearly distinguished from E. raschii and E. euzeti previously reported from the eastern Pacific, in the number of large apical hooks (23–25 in E. raschii and 25 in E. euzeti), number of lateral hooklets (27–36 and 6–7), number of spines per row on the cephalic peduncle (21–26 and 100–107) and number of testes (17–23 and 37–42). An updated key to the species of the genus Echinobothrium is presented.

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