The Roughskin Dogfish Centroscymnus owstonii is a poorly known species with eventual records along the Western South Atlantic. Different dermal denticles have been historically reported for juveniles and adults, which presupposes changes from a juvenile denticle type to an adult denticle type during growth. The present study was based on a male neonate 324 mm in total length (TL) captured with crab pots on the northeastern continental slope of Brazil, between 400–450 meters. This was considered a newborn based on its small size, very similar to previously reported large embryo dimensions and close to the expected birth size in literature. Three different dermal denticles were observed, alternating from the rostrum to the branchial slits, where a tricuspidated denticle type extended covering the rest of the posterior portion of the body. Dermal denticle types and distribution suggest that the replacement process of dermal denticles begins before birth or early after birth, undergoing at least three changes until reaching the adult dermal denticle type. These different types may be related to uterine epithelial histotroph absorption or embryo movement within the mucous environment, which would be enhanced by largely spaced denticles. The reported fragmented distribution of this species along the Brazilian coast is probably related to insufficient sampling coverage.

粗皮Dog鱼Centrosscymnus owstonii是一个鲜为人知的物种，沿西南大西洋最终有记录。历史上已经报道了针对少年和成年人的不同真皮齿状体，其以在生长过程中从幼年的牙齿型到成年的牙齿型为前提。本研究基于巴西东北大陆斜坡（400-450米之间）用蟹笼捕获的全长324毫米（TL）的雄性新生儿。由于其尺寸小，与先前报道的大胚胎尺寸非常相似且接近文献中预期的出生尺寸，因此被认为是新生儿。观察到三个不同的真皮细齿，从讲台到分支狭缝，其中三尖瓣的齿状类型延伸，覆盖了身体的其余部分。真皮牙本质的类型和分布表明，真皮树突的替换过程始于出生前或出生后的早期，经历至少三处变化，直到达到成年的真皮齿状物类型。这些不同的类型可能与粘液环境中的子宫上皮组织营养素吸收或胚胎运动有关，这可能会因间隔较大的树突而增强。据报道，该物种在巴西沿海的零散分布可能与采样覆盖率不足有关。较大间隔的细齿将增强这种效果。据报道，该物种在巴西沿海的零散分布可能与采样覆盖率不足有关。较大间隔的细齿将增强这种效果。据报道，该物种在巴西沿海的零散分布可能与采样覆盖率不足有关。