Haminoea orbignyana (Férussac, 1822)
W. France to Malta and central Mediterranean, to Canarias, to Cabo Verde. Grazer in estuaries and lagunar systems, on mud or muddy sand, often among Zostera meadows.
Basionym: Bulla orbignyana.
 
The shell is devoid of any spiral sculpture, and only bears some longitudinal growth marks; the aperture is broad anteriorly, narrow posteriorly; labial margin « slightly larger than the spire, which is involute » (Malaquias & Cervera, 2006). « Columella covered by thin callus ».

Sant’Antioco island, Carbonia-Iglesias, SW. Sardinia. 10mm.
Synonyms: dilatata Leach, temarana Pruvot-Fol.
 
« The background body color is variable, generally light fawn in young specimens and greenish in the adult ones. Orange and brown spots are disseminated all over the body and there are white spots in the palial lobe. The upper edges of the parapodial lobes and the lateral edges of the cephalic shield are pigmented with a dark green-brown color. There is also a triangular area of this color from the eyes to the anterior edge of the cephalic shield… » – Talavera, Murillo & Templado: “The genus Haminoea Turton & Kingston, 1830 (Opisthobranchia, Bullomorpha) in the south east of Spain with the description of a new species”, Bollettino Malacologico vol. 23(1-4), Milano 1987, p.58.

Specimen laying eggs on some sea lettuce at the Pialassa Baiona, an eutrophic coastal lagoon connected to the Adriatic Sea through the channel-port of Ravenna, Italy. Notice the dark colour of the parapodial lobes. Original picture provided by M. Ponti for iNaturalist.org – (CC BY-NC).
The shape is unique among the mediterranean members of the genus, with this aperture expanding anteriorly, and the narrowed posterior end. There is some transverse microsculpture, but much weaker than in navicula.
On sand at 2m deep, Málaga, Andalucia, S. Spain. 7,5mm.
Young. Shallow water, southern beach of Port-Camargue, Le Grau-du-Roi, Gard, S. France. Original picture provided by P. Corbrion for iNaturalist – (CC BY-NC-SA).
Other young from the same spot.
Original picture provided by P. Corbrion for iNaturalist.
– (CC BY-NC-SA) –

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