Nautilus belauensis a zo ur spesad Nautilus, brosezat er morioù en-dro da bPalau.
a vo kavet e Wikimedia Commons.
Nautilus belauensis és una espècie de nàutil nativa de les aigües del voltant de l'illa nació de Palau, a l'oceà Pacífic. Per això, també s'anomena Nàutil de Palau. N. belauensis és molt semblant a Nautilus pompilius, comparteixen un llombrígol tancat i cobert per un cal·lus. Es diferencien en la base de la ràdula.
N. belauensis és el segon nàutil més gran després del N. pompilius pompilius. La seva conquilla fa al voltant de 21 cm de diàmetre, encara que s'han recollit espècimens més grans.
Nautilus belauensis és una espècie de nàutil nativa de les aigües del voltant de l'illa nació de Palau, a l'oceà Pacífic. Per això, també s'anomena Nàutil de Palau. N. belauensis és molt semblant a Nautilus pompilius, comparteixen un llombrígol tancat i cobert per un cal·lus. Es diferencien en la base de la ràdula.
N. belauensis és el segon nàutil més gran després del N. pompilius pompilius. La seva conquilla fa al voltant de 21 cm de diàmetre, encara que s'han recollit espècimens més grans.
The Palau nautilus, Nautilus belauensis, is mainly found in Palau in the Western Carolines[2] as its name suggests. It can be found on fore reef slopes[3] in depths ranging from 95m to 504m but typically prefers to remain within 150-300m where water temperatures range between 16.6 to 9.4°C.[4] N. belauensis are highly mobile epibenthic scavenging herbalist and opportunistic predators that rely mostly on scent detection.[4] They are active both diurnally and nocturnally within the preferred depth range[4] although most shallow-water-incursions are usually nocturnal events that coincide with greatly diminished fish activities.[4]
N. belauensis' shell is similar to that of N. pompilius, but it is distinguished by its larger mean mature shell diameter and shell weight.[5] Its shell characteristic pattern consists of bifurcating brown to red stripes that extend from the umbilicus to the venter without coalescing across the venter[5] with delicate, longitudinally crenulated ridges[2] that produce a distinctive, concentrically lirate pattern.[2] It can also be distinguished from N. pompilius by its inwardly sloping umbilical walls and evenly rounded umbilical shoulder.[6] The shell is also distinguishable by the presence of longitudinally crenulated shell sculpture, and a broadly triangular central rachidian radular tooth and a lack of umbilical callus.[5] Fresh shells were also found to implode at 680-789m depth equivalent pressures.[4]
At the immature/juvenile stage the Palau nautilus' shell is covered in colored bands.[3] Its body chamber is covered by a thick, gelatinous, and slippery periostracum.[3] As it reaches the sub mature stage, most of its body chamber is white but with thin margins.[3] However, it still lacks a black layer that develops upon maturity.[3]
Maturity in the Palau nautilus is reached when there is a rapid decrease in growth rate until there is no additional growth.[3] The body chamber shell wall thickens with deposition of a black layer along the apertural margin and the accentuation of the hyponomic and ocular sinuses.[3] The exterior body chamber lacks colour banding.[3] The last septum is thickened but has a reduced volume in the final chamber.[3] There are usually around 35 septa in the shell.[2] The maximum observed range in shell sizes extends from 180mm to 239mm in diameter[5] with the umbilical diameter taking up 16% of the shell diameter.[6] The Palau nautilus can live for 5-10 years after reaching maturity and have a life span that may range beyond 20 years.[3]
The Palau nautilus is able to traverse across a wide range of temperatures and great lateral distances in short periods of time.[7] It is also able to survive in warm water up to 30°C for tens of hours up to several days.[4] It typically migrates from deeper water into shallower water following sunset and returns to the deep before sunlight.[7] It is also able to travel an average distance from 0.45km per day over 322 days up to 0.8km per day over 5 days.[7]
N. belauensis seen from the front, showing the hyponome
Palau nautilus viewed from above
Diver with Palau nautilus showing size of a typical captured specimen
Close-up view of the eye of the Palau nautilus
View of a Palau nautilus from the side
A cage used to capture Palau nautiluses from a depth of approximately 30 m: note the five nautiluses and the mostly eaten chicken. The animals are released unharmed.
The Palau nautilus, Nautilus belauensis, is mainly found in Palau in the Western Carolines as its name suggests. It can be found on fore reef slopes in depths ranging from 95m to 504m but typically prefers to remain within 150-300m where water temperatures range between 16.6 to 9.4°C. N. belauensis are highly mobile epibenthic scavenging herbalist and opportunistic predators that rely mostly on scent detection. They are active both diurnally and nocturnally within the preferred depth range although most shallow-water-incursions are usually nocturnal events that coincide with greatly diminished fish activities.
El nautilo de Palaos (Nautilus belauensis) es una especie de molusco cefalópodo de la familia Nautilidae nativa de las aguas de los alrededores de la isla de Palaos, en el océano Pacífico. N. belauensis es muy parecido al Nautilus pompilius, comparten un ombligo cerrado y cubierto por una callosidad. Se diferencian en la base de la rádula.
N. belauensis es el segundo nautilus más grande después del N. pompilius pompilius. Su concha alrededor de 210 mm de diámetro, aunque se han recogido especímenes mayores, de hasta 226 mm.[1]
El nautilo de Palaos (Nautilus belauensis) es una especie de molusco cefalópodo de la familia Nautilidae nativa de las aguas de los alrededores de la isla de Palaos, en el océano Pacífico. N. belauensis es muy parecido al Nautilus pompilius, comparten un ombligo cerrado y cubierto por una callosidad. Se diferencian en la base de la rádula.
N. belauensis es el segundo nautilus más grande después del N. pompilius pompilius. Su concha alrededor de 210 mm de diámetro, aunque se han recogido especímenes mayores, de hasta 226 mm.
Nautilus belauensis est une espèce de nautiles endémique de la région entourant les Palaos.
Nautilus belauensis préfère les eaux dont la température varie de 10 à 20 °C, ce qui est habituellement la plage de températures à des profondeurs comprises entre 125 et 200 m[2].
L'holotype de Nautilus belauensis, un mâle adulte[2], présente une coquille d'un diamètre de 216 mm et pèse 1 450 g[2].
Sur 375 spécimens capturés en 1977, le diamètre de leur coquille s'étendait de 180 à 226 mm avec une moyenne à 204 mm[2]. Le poids des 268 spécimens matures variait de 950 à 1 800 g avec une valeur moyenne de 1 308 g[2].
Son nom spécifique, composé de belau et du suffixe latin -ensis, « qui vit dans, qui habite », lui a été donné en référence au lieu de sa découverte, les Palaos dont le nom paluan est Belau[2].
Nautilus belauensis is een inktvissensoort uit de familie Nautilidae (nautilussen), die tot de stam der weekdieren (Mollusca) behoort. De soort is hoofdzakelijk een aaseter, die ook wel kleine levende prooien pakt als hij de kans krijgt.
Nautilus belauensis werd in 1981 beschreven en gepubliceerd door Saunders.[1][2] De soort wordt, met een maximale schelpdiameter van 226 mm, bijna net zo groot als Nautilus pompilius.[3]
Nautilus belauensis is alleen van de typelocatie, het zoute water rond de eilandengroep Palau, bekend.
Bronnen, noten en/of referentiesNautilus belauensis (palauperlebåt) er en art i slekten Nautilus som inngår i familien av perlebåter (Nautilidae). Arten lever i havområdene rundt Palau.[1] Skallet er som oftest rundt 210 millimeter i diameter og det har blitt observert individer med en diameter på opptil 226 millimeter.[2]
Inndelingen under følger World Register of Marine Species (WoRMS) og er i henhold til Rosenberg (2016).[3] Norske navn og beskrivelser i parentes er nødvendigvis ikke offisielle.
Nautilus belauensis (palauperlebåt) er en art i slekten Nautilus som inngår i familien av perlebåter (Nautilidae). Arten lever i havområdene rundt Palau. Skallet er som oftest rundt 210 millimeter i diameter og det har blitt observert individer med en diameter på opptil 226 millimeter.
Nautilus belauensis (nomeada, em inglês, Palau nautilus)[4] é uma espécie de molusco cefalópode nectônico marinho do Indo-Pacífico, pertencente à família Nautilidae e à ordem Nautilida[2], sendo classificada por W. B. Saunders, em 1981, no texto "A new species of Nautilus from Palau", publicado no periódico Veliger (24(1): páginas 1-7).[3] Possui o comprimento máximo de 22.6 centímetros.[4]
Trata-se de uma espécie associada às encostas externas dos recifes de coral[4][5], habitando uma faixa de profundidade de até 480 metros[6] (acreditando-se que vivam entre 100 e 600 metros)[5] em Palau, na Micronésia, onde é espécie endêmica.[4][5]
Nautilus belauensis é muito semelhante à espécie Nautilus pompilius e compartilha com esta um umbílico fechado, coberto por um calo (ou concreção). Difere desta com base em uma rádula modificada e sulcos finos e levantados através e ao longo de sua concha, que formam uma textura de grade cruzada.[7] A espécie belauensis é o maior Nautilus, quando bem desenvolvida.[4]
Nautilus belauensis (nomeada, em inglês, Palau nautilus) é uma espécie de molusco cefalópode nectônico marinho do Indo-Pacífico, pertencente à família Nautilidae e à ordem Nautilida, sendo classificada por W. B. Saunders, em 1981, no texto "A new species of Nautilus from Palau", publicado no periódico Veliger (24(1): páginas 1-7). Possui o comprimento máximo de 22.6 centímetros.
Ốc anh vũ Palau (danh pháp hai phần: Nautilus belauensis) là một loài ốc anh vũ bản địa ở các vùng nước quanh đảo quốc Thái Bình Dương Palau.[1] N. belauensis rất giống với Nautilus pompilius. Loài này là loài ốc anh vũ lớn thứ nhì sai Nautilus pompilius pompilius. Vỏ có đường kính khoảng 210 mm dù mẫu vật có đường kính 226 mm đã được ghi nhận.[2]
Ốc anh vũ Palau (danh pháp hai phần: Nautilus belauensis) là một loài ốc anh vũ bản địa ở các vùng nước quanh đảo quốc Thái Bình Dương Palau. N. belauensis rất giống với Nautilus pompilius. Loài này là loài ốc anh vũ lớn thứ nhì sai Nautilus pompilius pompilius. Vỏ có đường kính khoảng 210 mm dù mẫu vật có đường kính 226 mm đã được ghi nhận.
帕劳鹦鹉螺（學名：Nautilus belauensis）为《华盛顿公约》中Ⅰ类保育动物，分布于太平洋岛国帕劳。
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