Aplysia parvula (Yonow, Nathalie 2012)
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Ordo: Anaspidea
Familia: Aplysiidae
Genus: Aplysia
Name
Aplysia parvula Guilding in Moerch, 1863 – Wikispecies link – Pensoft Profile
- Aplysia parvula Yonow, Nathalie, 2012, ZooKeys 197: 1-1.
Description
Description/Remarks. The dark colour form is common in the Red Sea and western Indian Ocean (Yonow 1994a, Yonow et al. 2002, Yonow 2008) and also occurs in the western Pacific (Gosliner et al. 2008), albeit less frequently. The pale Socotra specimen is well relaxed and preserved: the body is cream coloured with black edging to the rhinophores, oral tentacles, foot, and parapodia. Both colour forms are small, and one is the reverse colour pattern of the other. Although pale Aplysia parvula are recorded to grow to 120 mm (Marshall and Willan 1999), the largest size recorded for the dark colour formis the Maldives specimen listed above at 20 mm. Consistent differences occur in the colour patterns: Aplysia parvula sensu strictu is usually pale green or greenish brown with white marbling and spots, and dark purple-to-black margins on the tentacles and parapodia (Plate 10). The black form is very dark brown or black, sometimes with white speckles, and with pale pink or violet edging to the parapodia and tentacles (Plate 11). The pale form is found in shallow tidal areas with seaweed, while the dark form is found on coral reefs in more exposed areas. Several other colour patterns have been illustrated on the La Reunion website. The radula of the Socotra specimen has the formula 29 (+2) x 4.7.1.7.4. It is comparable in formula and size to those of the dark form previously examined from the Red Sea (26 (+1) x 4.6.1.6.4: Yonow 2000) and Chagos (26 (+3) x 3.6.1.6.3: Yonow et al. 2002), although it must be stressed that the radulae are not very good diagnostic features for differentiating between species of Aplysia. The shell is also similar in both forms but again, it is variable and therefore not a particularly useful character for determining species of aplysiids.
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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