Mikadotrochus hirasei, common name the emperor's slit shell, is a species of large deepwater sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.[1]
The shell has a typical trochoid shape with a spire angle of approximately 72 degrees and nearly smooth sided until the body whorls which are slightly inflated at the shoulder with a rounded periphery. The base is moderately convex to flat, and the shell has a large nacreous (pearly) columellar callus which covers about one third of the base and can be keeled at its outer margin. The aperture is oval, the slit is positioned mid whorl and is long, about 16 to 20 percent of the circumference. The shell is heavily textured with about 20 spiral cords crossed by numerous fine crescent shaped axial growth lines above the selenizone (the area where the shell growth filled in the slit) and about 10 spiral cords below.
The shell is creamy yellow overlaid with many crimson axial flammules above and below the selenizone which has yellowish orange crescent shaped growth marks, the base is a pale creamy yellow with occasional light crimson flammules, and the interior of the aperture is nacreous. The shell is occasionally found with part of its dark brown periostracum near the margin opposite the aperture. The operculum is small, dark brown, multispiral, and chitinous. Size range: 45 to 129 mm diameter.[2][3]
This species is found in deep water between 150 and 300 meters on mud and sand off the coast of the Shima Peninsula in Japan westwards to the Pacific coast of Shikoku Island, in the East China Sea west of Kyushu to Taiwan, and has also been found in the central Philippines.[2]
Mikadotrochus hirasei, common name the emperor's slit shell, is a species of large deepwater sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.
Mikadotrochus hirasei is een slakkensoort uit de familie van de Pleurotomariidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1903 door Pilsbry.
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Mikadotrochus hirasei (Pilsbry, 1903) é uma espécie de molusco gastrópode marinho da família Pleurotomariidae, nativa do oeste do oceano Pacífico.[2] É a espécie mais comum e conhecida de sua família.[2][3]
Mikadotrochus hirasei possui uma concha bastante grossa e pesada,[2] em forma de cone, de até 10 centímetros.[3] Fenda lateral, típica de Pleurotomariidae, naturalmente preenchida durante o crescimento, formando uma cicatriz bem definida. Relevo de estrias em espiral, atravessadas por finas linhas de crescimento.[4] Coloração creme, fortemente coberta com faixas diagonais variando de salmão pálido a vermelho alaranjado.[5][1] Alguns exemplares, mais raros, apresentam conchas albinas.[3][2]
Exemplar de M. hirasei, onde são visíveis a cicatriz de crescimento de sua fenda lateral, em voltas anteriores.
São encontrados em águas profundas, abaixo de 100 metros, do sudoeste do Japão,[5] Taiwan[2] e Filipinas.[6]
|acessodata= requer |url= (ajuda) |coautor= (ajuda); |acessodata= requer |url= (ajuda) |coautor= (ajuda); |acessodata= requer |url= (ajuda) |coautor= (ajuda); |acessodata= requer |url= (ajuda) Mikadotrochus hirasei (Pilsbry, 1903) é uma espécie de molusco gastrópode marinho da família Pleurotomariidae, nativa do oeste do oceano Pacífico. É a espécie mais comum e conhecida de sua família.
红翁戎螺（学名：Mikadotrochus hirasei），是原始腹足目翁戎螺科翁戎螺属的一种。主要分布于台湾，常栖息在深海。[1]
曾用学名Perotrochus hirasei，2010年被Anseeuw P.认定为Mikadotrochus hirasei。[2]
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