Hexabranchus sanguineus (Yonow, Nathalie 2012)
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Ordo: Nudibranchia
Familia: Hexabranchidae
Genus: Hexabranchus
Name
Hexabranchus sanguineus Rueppell & Leuckart, 1828 – Wikispecies link – Pensoft Profile
- Hexabranchus sanguineus Yonow, Nathalie, 2012, ZooKeys 197: 1-1.
Description
Description. The large specimens and individuals were of the typical Indo-West Pacific colour pattern, blotchy red and cream, especially along the margins. The 13 mm juvenile specimen from the Maldives illustrated here (Plate 26) is well relaxed, and the six gills can be seen to insert into separate openings. The oral tentacles are large rounded lobes, clearly the precursors to the lappets of the adult: these tentacles are huge in comparison to those of a chromodorid (or dorid) of similar size. The rhinophores have 13 lamellae; note that the white edges present in the adults have not yet developed. Another 15 mm juvenile individual was identical in colour pattern, while a slightly larger animal from the Seychelles demonstrated the developing adult colour pattern already had white edges to the 17+ rhinophore lamellae (Plate 27). The radular formulae of the larger specimens are tabulated below: the sizes listed are of the same dimension of a large lateral tooth - from the tip of the cusp to the flange where the cusp meets the base. There is no relationship between the radular formula and maximum tooth size, nor are they correlated with preserved animal size. A giant Hong Kong specimen is included for comparison, and has the largest teeth but not the largest radula. It had a bubbly texture and was pinkish yellow in life (M Collard pers. comm.; specimen, radula, notes and photographs lodged in the Natural History Museum, London: NHMUK acc. no. 2337 with the "Red Sea Giant"). Socotra 55 mm pres. 41 x 64.0.64 500 μm Yemen 85 mm pres. 53 x 93-83.0.83-93 550 μm Kenya 90 mm pres. 47 x 77.0.77 700 μm Kenya 95 mm pres. 46 x 79.0.79 450 μm Hong Kong 190 mm pres. 51 x 67.0.67 800 μm
Taxon Treatment
- Yonow, Nathalie; 2012: Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda) ZooKeys, 197: 1-1. doi
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