HYPSELODORIS MACULOSA - (PEASE, 1871)
Opisthobranchia (Infraclass) > Nudibranchia (Order) > Euctenidiacea (Suborder) > Doridacea (Infraorder) > Doridoidea (Superfamily) > Chromodorididae (Family) > Hypselodoris (Genus)
Doris maculée
Hypselodoris maculosa est une espèce de nudibranche du genre Hypselodoris.
Description
Cette espèce peut mesurer plus de 3 cm. Le corps est allongé et de forme ovale, la jupe du manteau est étroite sauf sur la face antérieure ou elle forme un voile au-dessus de la cavité buccale. Le pied dépasse sur la partie antérieure formant une pointe. Les motifs et la coloration de la livrée sont très variées. Le dessus du manteau est généralement orange-crème à blanc-crème avec de fines lignes blanches longitudinales et est constellé d'une certaine quantité de points pourpres. Les franges latérales du manteau peuvent comporter une bande orange au bords internes ondulés, les deux bordures internes et externes sont dotées de pointillés espacés pourpres. Les bords antérieurs et postérieurs ainsi que la queue du pied sont mauves à pourpres avec des points blanc. Les rhinophores sont lamellés, leur base est translucide et la partie supérieure est blanchâtre avec d'une à trois bandes circulaires orange. Le bouquet branchial est blanchâtre et surligné d'orange.
Distribution
Cette espèce se rencontre dans la zone tropicale Indo / Ouest-Pacifique. Présent en Nouvelle-Calédonie.
Habitat
Son habitat est la zone récifale externe, sur les sommets ou sur les pentes jusqu'à la zone des 30 m de profondeur.
Alimentation
Hypselodoris maculosa se nourrit principalement d'éponges.
Éthologie
Cet Hypselodoris est benthique et diurne, se déplace à vue sans crainte d'être pris pour une proie de par la présence de glandes défensives réparties dans les tissus du corps.
Synonymes
Chromodoris decorata (Risbec, 1928)
Chromodoris maculosa (Pease, 1871)
Glossodoris decorata (Risbec, 1928)
Hypselodoris decorata (Risbec, 1928)
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Hypselodoris maculosa is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Description
The colour pattern is complicated and very variable. One of the simplest patterns is illustrated by the Tanzanian specimen [lower right photo]. The background colour of the mantle is a pale milky orange-brown. Around the anterior of the mantle is a broad translucent pinkish-purple margin with scattered white and darker pinkish-purple spots. At the posterior end the margin is similarly coloured but the band is not as broad. From the level of the rhinophores back to the gill pocket, there is a broad orange band at the edge. On the inside edge of the orange band, at the junction with the milky orange-brown central region, there is a series of reddish-purple streaks running back from the rhinophore pocket to the gill pocket on each side. In the gaps between the reddish-purple streaks are a pair of white streaks, one inside and one outside the red. The orange band appears wider adjacent to the red streaks because the outer white line of the alternating pair of white lines narrows the orange band on each side. Running down the central part of the mantle are four narrow white lines. There are five small dark pinkish-purple spots down the midline between the gills and rhinophores. The rhinophore stalks are translucent white and the clubs are white with a broad orange band at the base and another just below the tip. The simple gills are translucent white with a deep orange line down the outer edge and an orange tip. The bottom half of each gill is translucent orange. The sides of the body and the foot are a translucent pinkish-purple with a colourless band at the edge. On the sides of the body there are white lines and streaks running parallel to the edge of the foot and some pinkish-purple spots. On the posterior part of the foot extending beyond the end of the mantle there are scattered white spots and around the inside edge of the colourless translucent margin are a row of elongate pinkish-purple streaks. The mantle is elongately oval, widening at the anterior end to give a spatulate appearance. The mantle overlap is very reduced, especially along the sides, and the foot extends some distance behind the posterior limit of the mantle. The animal is relatively high and narrow and the simple gills are arranged in a circle, open posteriorly, around the anus. There is a large aggregation of mantle glands opening at the edge, around the posterior end of the mantle. A few small mantle glands are found on each side adjacent to the rhinophores but they are absent elsewhere.
Distribution
This nudibranch is found in the tropical Indo-Pacific Ocean. Reported fron New Caledonia.
Feeding
This species has been observed feeding on yellow sponges from the genus Euryspongia.
Similar species
Hypselodoris maculosa is similar in appearance to Thorunna australis (Risbec, 1928). Bill Rudman (1998) points out that although Thorunna australis has "some similarities to some colour forms of Hypselodoris maculosa but whereas that species has multiple longitudinal white lines Thorunna australis has only one on either side of the mantle. Both species have reddish bands on the rhinophores, always one in Thorunna australis but up to three in Hypselodoris maculosa."
Doris maculée
Hypselodoris maculosa est une espèce de nudibranche du genre Hypselodoris.
Description
Cette espèce peut mesurer plus de 3 cm. Le corps est allongé et de forme ovale, la jupe du manteau est étroite sauf sur la face antérieure ou elle forme un voile au-dessus de la cavité buccale. Le pied dépasse sur la partie antérieure formant une pointe. Les motifs et la coloration de la livrée sont très variées. Le dessus du manteau est généralement orange-crème à blanc-crème avec de fines lignes blanches longitudinales et est constellé d'une certaine quantité de points pourpres. Les franges latérales du manteau peuvent comporter une bande orange au bords internes ondulés, les deux bordures internes et externes sont dotées de pointillés espacés pourpres. Les bords antérieurs et postérieurs ainsi que la queue du pied sont mauves à pourpres avec des points blanc. Les rhinophores sont lamellés, leur base est translucide et la partie supérieure est blanchâtre avec d'une à trois bandes circulaires orange. Le bouquet branchial est blanchâtre et surligné d'orange.
Distribution
Cette espèce se rencontre dans la zone tropicale Indo / Ouest-Pacifique. Présent en Nouvelle-Calédonie.
Habitat
Son habitat est la zone récifale externe, sur les sommets ou sur les pentes jusqu'à la zone des 30 m de profondeur.
Alimentation
Hypselodoris maculosa se nourrit principalement d'éponges.
Éthologie
Cet Hypselodoris est benthique et diurne, se déplace à vue sans crainte d'être pris pour une proie de par la présence de glandes défensives réparties dans les tissus du corps.
Synonymes
Chromodoris decorata (Risbec, 1928)
Chromodoris maculosa (Pease, 1871)
Glossodoris decorata (Risbec, 1928)
Hypselodoris decorata (Risbec, 1928)
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Hypselodoris maculosa is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Description
The colour pattern is complicated and very variable. One of the simplest patterns is illustrated by the Tanzanian specimen [lower right photo]. The background colour of the mantle is a pale milky orange-brown. Around the anterior of the mantle is a broad translucent pinkish-purple margin with scattered white and darker pinkish-purple spots. At the posterior end the margin is similarly coloured but the band is not as broad. From the level of the rhinophores back to the gill pocket, there is a broad orange band at the edge. On the inside edge of the orange band, at the junction with the milky orange-brown central region, there is a series of reddish-purple streaks running back from the rhinophore pocket to the gill pocket on each side. In the gaps between the reddish-purple streaks are a pair of white streaks, one inside and one outside the red. The orange band appears wider adjacent to the red streaks because the outer white line of the alternating pair of white lines narrows the orange band on each side. Running down the central part of the mantle are four narrow white lines. There are five small dark pinkish-purple spots down the midline between the gills and rhinophores. The rhinophore stalks are translucent white and the clubs are white with a broad orange band at the base and another just below the tip. The simple gills are translucent white with a deep orange line down the outer edge and an orange tip. The bottom half of each gill is translucent orange. The sides of the body and the foot are a translucent pinkish-purple with a colourless band at the edge. On the sides of the body there are white lines and streaks running parallel to the edge of the foot and some pinkish-purple spots. On the posterior part of the foot extending beyond the end of the mantle there are scattered white spots and around the inside edge of the colourless translucent margin are a row of elongate pinkish-purple streaks. The mantle is elongately oval, widening at the anterior end to give a spatulate appearance. The mantle overlap is very reduced, especially along the sides, and the foot extends some distance behind the posterior limit of the mantle. The animal is relatively high and narrow and the simple gills are arranged in a circle, open posteriorly, around the anus. There is a large aggregation of mantle glands opening at the edge, around the posterior end of the mantle. A few small mantle glands are found on each side adjacent to the rhinophores but they are absent elsewhere.
Distribution
This nudibranch is found in the tropical Indo-Pacific Ocean. Reported fron New Caledonia.
Feeding
This species has been observed feeding on yellow sponges from the genus Euryspongia.
Similar species
Hypselodoris maculosa is similar in appearance to Thorunna australis (Risbec, 1928). Bill Rudman (1998) points out that although Thorunna australis has "some similarities to some colour forms of Hypselodoris maculosa but whereas that species has multiple longitudinal white lines Thorunna australis has only one on either side of the mantle. Both species have reddish bands on the rhinophores, always one in Thorunna australis but up to three in Hypselodoris maculosa."