Campbell R A, Andrade M
Department of Biology, University of Massachusetts Dartmouth 02747-2300, USA.
J Parasitol. 1997 Feb;83(1):115-20.
Echinobothrium raschii n. sp. from the spiral intestine of Rhinoraja longi in the Bering Sea, off the Aleutian Islands of Alaska is described. On the basis of the armature of the rostellum and cephalic peduncle the new species most closely resembles Echinobothrium acanthinophyllum, Echinobothrium acanthocolle, Echinobothrium coronatum and Echinobothrium helmymohamedi. Echinobothrium raschii n. sp. can be differentiated from all but E. coronatum by the possession of a continuous row of 27-36 lateral hooklets per side on the scolex and 21-26 spines per row on the cephalic peduncle. In E. acanthinophyllum there are fewer spines per row on the cephalic peduncle (13) and only 2 groups of 4 lateral hooklets per side instead of a continuous row of lateral hooklets; E. acanthocolle bears only 5 spines per row on the cephalic peduncle and has no lateral hooklets; E. helmymohamedi has 10-12 spines per row on the cephalic peduncle and bears no lateral hooklets. Echinobothrium raschii n. sp. can be distinguished from E. coronatum by number of spines per row on the cephalic peduncle (average 24 vs. 32) and testes number (17-23 vs. 9-11). The combined characters of 2 groups of 23-25 large apical hooks, a continuous alternating row of 27-36 hooklets on each side of the scolex between the groups of large apical hooks, 21-26 spines per row on the cephalic peduncle, and 17-23 testes per segment differentiates E. raschii from all other species of Echinobothrium. The prevalence of infection was 50% and mean intensity of infection was 8.7 worms per host. The current status of the genus Echinobothrium is discussed and a tabulation of the species presented.
描述了采自阿拉斯加阿留申群岛白令海的长吻扁鲨螺旋肠内的拉氏棘槽绦虫新种。根据吻部和头节的小棘，该新种与棘叶棘槽绦虫、棘颈棘槽绦虫、冠状棘槽绦虫和赫尔米·穆罕默德棘槽绦虫最为相似。拉氏棘槽绦虫新种与除冠状棘槽绦虫外的所有其他种的区别在于，其头节每侧有连续一排27 - 36个侧小钩，头节每行有21 - 26个小棘。在棘叶棘槽绦虫中，头节每行的小棘较少（13个），每侧只有2组4个侧小钩，而非连续一排侧小钩；棘颈棘槽绦虫头节每行只有5个小棘，且没有侧小钩；赫尔米·穆罕默德棘槽绦虫头节每行有10 - 12个小棘，也没有侧小钩。拉氏棘槽绦虫新种与冠状棘槽绦虫的区别在于头节每行小棘的数量（平均24个对32个）和睾丸数量（17 - 23个对9 - 11个）。2组23 - 25个大型顶端小钩、大型顶端小钩组之间头节每侧连续交替排列的27 - 36个小钩、头节每行21 - 26个小棘以及每节17 - 23个睾丸的综合特征，使拉氏棘槽绦虫与棘槽绦虫属的所有其他物种区分开来。感染率为50%，平均感染强度为每宿主8.7条虫。讨论了棘槽绦虫属的现状，并列出了该属物种的表格。
