Okenia, Menke, 1830

Tibiriçá, Yara, Pola, Marta & Cervera, Juan Lucas, 2017, Astonishing diversity revealed: an annotated and illustrated inventory of Nudipleura (Gastropoda: Heterobranchia) from Mozambique, Zootaxa 4359 (1), pp. 1-133 : 83-85

Okenia sp. 1

( Figure 27 C )

Material examined. One specimen. MB28-004930, ZDTR, 0 7 Oct. 2014, 0.2m, 8mm.

Habitats. Subtropical tidal reef.

Occurrences. Zavora.

Geographic distribution. Western Indian Ocean. Madagascar, South Africa (Gosliner et al. 2015) and Mozambique.

Remarks. This species resembles Okenia amoenula ( Bergh, 1907) from Cape Province in South Africa, however, the colour and shape of the papillae differ. In the specimens from Mozambique the elongate papillae are translucent at the base, orange at the middle and red at the tip with this colour pattern also present on the tail. In O. amoenula the papillae lack a red tip and are longer. Moreover, Mozambican specimens also have triangular yellow dorsal spots, which are absent in Bergh’s (1907, pl. XIII, fig.6) illustration of O. amoenula . Rather there is a pink line posterior to each rhinophore and another line extending from between the rhinophores terminating at the midbody. A similar line is present on the tail. Nevertheless the collected specimens, as with O. amoenula , exhibit simple dorsal papillae, except for the most posterior, which are bifurcate at the top. Thus, based on external morphology, this species appears undescribed, and additional anatomical and molecular analyses are needed to confirm this.

Figures

FIGURE 27. A, Goniodoris sp. (ZMBN105601). B, Okenia virginiae (MHN-YT1679). C, Okenia sp. 1 (MB28-004930). D, Okenia sp. 2 (MB28-004628). E, Trapania euryeia (MB28-004955). F, Trapania naeva (MB28-005038). G, Trapania vitta (MB28-004816). H, Diaphorodoris mitsuii (MB28-004524).I, Doto racemosa (MB28-004568). J, Doto ussi (ZMBN105080). K, Doto sp. 1 (MB28-004623).L, Dotosp. 2 (MB28-004991).