Pristiophorus lanae sp. nov., a new sawshark species from the western North Pacific, with comments on the genus Pristiophorus Müller & Henle, 1837 (Chondrichthyes: Pristiophoridae).
Pristiophorus lanae sp. nov., a new sawshark species from the western North Pacific, with comments on the genus Pristiophorus Müller & Henle, 1837 (Chondrichthyes: Pristiophoridae).
复制标题
Pristiophorus lanae sp. nov.，来自北太平洋西部的一种新锯鲨物种，对 Pristiophorus Müller & Henle 属的评论，1837（软骨鱼目：Pristiophoridae）。
作者：
D. Ebert;Hana A Wilms
本文记述了锯鲨一新种，即拉氏锯鲨Pristiophorus lanae sp. nov.是在菲律宾群岛附近发现的该新种是在北太平洋西部描述的Pristiophorus属的第二个成员，可以通过在吻触须前面具有较少的吻齿而与其最近的地理同源物P.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p.p（17 - 26对比25 - 32），嘴在眼角处向前延伸到眼睛后缘下方对比延伸到眼睛后缘的后三分之一下方，口宽为口前长度的6.9 - 7.8倍（对比5.8 - 6.9），眼长与头长之比（15.6 - 15.9对9.8 - 13.2），口宽与头长之比为9.0 - 10.0对7.4 - 8.5倍，头宽在鼻孔5.2 - 6.1倍于眶前长对3.9 - 4.9倍，较短的前须长口前长度的50.7 - 54.5%对53.6 - 59.2%，吻角为10.6 - 13.0度对12.4度-14.6度，和侧干密生，平冠覆瓦状，直立冠不覆瓦状。单棘椎骨的数量在P.lanae（43 - 48）中略低于P.lanae（51 - 52）。对该属进行了综述，并提出了一个修订的种检索表。
A new species of sawshark, Pristiophorus lanae sp. nov., is described from off the Philippine Islands. The new species is the second member of the genus Pristiophorus described from the western North Pacific and can be separated from its closest geographic congener, P. japonicus, by having fewer rostral teeth in front of rostral barbels (17-26 versus 25-32), mouth at corners extending forward to below the rear margin of the eye versus extending below the rear one-third of eye margin, a greater mouth width at 6.9-7.8 times into pre-oral length (versus 5.8-6.9), eye length into head length (15.6-15.9 versus 9.8-13.2), mouth width into head length 9.0-10.0 versus 7.4-8.5 times, head width at nostrils 5.2-6.1 times into pre-orbital length versus 3.9-4.9 times, shorter prebarbel length (from snout tip to barbel) of 50.7-54.5% of preoral length versus 53.6-59.2%, a snout angle of 10.6-13.0 degrees versus 12.4 degrees - 14.6 degrees, and lateral trunk denticles with flat crowns that are imbricated versus erect crowns that are not imbricated. The number of monospondylous vertebrae is slightly lowe in P. lanae (43-48) versus P. japonicus (51-52). The genus is reviewed, with a revised key to its species presented.