奥维氏伯氏藻,一种新的深水猫鲨,来自澳大利亚西北部。属于未知种类的Apristurus的独特卵病例促使对澳大利亚西北部的Apristurus标本进行了更详细的调查。先前从丹皮尔群岛收集的一个标本被鉴定为A.sinensis,被发现带有一个卵。清除此卵病例证实,该物种负责产生先前记录的独特卵病例。该物种的卵壳在背侧和腹侧表面上有很强的T形纵向脊,这在Apristurus属中是独一无二的。这些山脊与南美Bythaeluruscanescens中存在的山脊最相似,但是更大,总是T形。整型在形态上最接近A.sinensis,但不同之处在于具有中等棕色的颊腔(与喷射黑色),脊蛋病例(vs.光滑的鸡蛋箱),肠螺旋瓣膜转动较少,胸鳍较大。整型也相似,在分子水平上最接近,与A.Nakayai共享独特的突触特征,白色有光泽的虹膜(属内的无形)。从卵中取出的晚期胚胎表面上类似于整型,只是在背外侧前表面上有两排平行的扩大的真皮小齿。讨论和挑战了阿普斯特鲁斯和Pentanchus属的最新命名变化。这项研究强调了卵壳形态对卵生弹性分支分类学的重要贡献。
Apristurus ovicorrugatus, a new species of deepwater catshark, is described from northwestern Australia. Unique egg cases belonging to an unknown species of Apristurus prompted a more detailed investigation of Apristurus specimens off northwestern Australia. One specimen previously identified as A. sinensis collected off Dampier Archipelago was found gravid with a single egg
case. Removal of this egg
case confirmed that this species was responsible for producing the unique egg cases previously recorded. The egg cases of this species have strong T-shaped longitudinal ridges on the dorsal and ventral surfaces which are unique in the genus Apristurus. The ridges most closely resemble those present in Bythaelurus canescens from South America, but are larger and always T-shaped. The holotype is closest morphologically to A. sinensis but differs in having a medium brown buccal cavity (vs. jet black), ridged egg cases (vs. smooth egg cases), fewer intestinal spiral valve turns and larger pectoral fins. The holotype is also similar, and closest on a molecular level, to A. nakayai with which it shares a unique synapomorphic character, the white shiny iris (apomorphic within the genus). A late-term embryo removed from an egg
case superficially resembled the holotype except in having two parallel rows of enlarged dermal denticles on the dorsolateral predorsal surface. Recent nomenclatural changes to the genera Apristurus and Pentanchus are discussed and challenged. This study highlights the important contribution that egg
case morphology has on oviparous elasmobranch taxonomy.