Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic.
Division of Natural Sciences, St. Norbert College, 100 Grant Street, De Pere, Wisconsin 54115.
J Parasitol. 2023 Jul 1;109(4):322-332. doi: 10.1645/22-99.
Based on previous molecular phylogenetic analyses, Bothriocestus n. gen. is erected to accommodate bothriocephalid tapeworms that have an elongate scolex, a well-developed apical disc, and a narrow neck region, parasitize freshwater fishes in the Holarctic, and were previously placed in the polyphyletic genus Bothriocephalus Rudolphi, 1808 (Cestoda: Bothriocephalidea). Bothriocestus claviceps (Goeze, 1782) n. comb., a parasite of eels (Anguilla spp.) in the Holarctic region, is designated as the type species. Another species of the new genus, Bothriocestus cuspidatus (Cooper, 1917) (syn. Bothriocephalus cuspidatusCooper, 1917) is redescribed from type and voucher specimens, and new material from the type host, the walleye, Sander vitreus (Mitchill, 1818) (Perciformes: Percidae), in Manitoba and Ontario (where the type locality is located) (Canada) and in New York state and Wisconsin. Bothriocestus cuspidatus of S. vitreus is characterized primarily by the possession of a narrow, long strobila (total length up to 18 cm) composed of distinctly craspedote, trapezoidal proglottids, with primary, secondary, and tertiary proglottids differing in size, and by an arrow-shaped (=cuspidatus) scolex that is distinctly broader than the first proglottids, widest near the base in lateral view and gradually becoming broader toward the anterior end in dorsoventral view. A "dwarf" form of B. cuspidatus (total length of 9-27 mm) from Johnny darter, Etheostoma nigrum Rafinesque, 1820, and tessellated darter, Etheostoma olmstedi Storer, 1842 (both Percidae: Etheostominae), is also characterized morphologically in the present paper.
基于先前的分子系统发育分析，建立了 Bothriocestus 属来容纳那些具有细长的头节、发达的顶端盘和狭窄的颈部区域的双腔科绦虫，它们寄生在北温带的淡水鱼类中，以前被归类于多系的 Bothriocephalus Rudolphi, 1808 属（绦虫纲：双腔目）。北温带地区的鳗鱼（鳗鲡属）寄生虫 Bothriocestus claviceps（Goeze，1782）n. comb. 被指定为模式种。新属的另一个种，Bothriocestus cuspidatus（Cooper，1917）（原为 Bothriocephalus cuspidatus Cooper，1917），根据模式和凭证标本进行了重新描述，并从模式宿主北美狗鱼，Sander vitreus（Mitchill，1818）（鲈形目：鮰科），在加拿大马尼托巴省和安大略省（模式产地）以及纽约州和威斯康星州获得了新的材料。S. vitreus 的 B. cuspidatus 主要特征为拥有狭窄、长的节片（总长度可达 18 厘米），由明显的栉状、梯形节片组成，初级、次级和三级节片大小不同，以及箭头形（=cuspidatus）的头节明显比第一节片宽，在侧视图中靠近基部最宽，在背腹视图中逐渐向前端变宽。来自 Johnny darter，Etheostoma nigrum Rafinesque，1820，和 tessellated darter，Etheostoma olmstedi Storer，1842（均为鲈形目：Etheostominae）的 B. cuspidatus 的“矮”型（总长度 9-27 毫米）也在本文中从形态学上进行了特征描述。
