Lost and found: The Eocene family Pyramimitridae (Neogastropoda) discovered in the Recent fauna of the Indo-Pacific
Author
Kantor, Yuri
Author
Lozouet, Pierre
Author
Puillandre, Nicolas
Author
Bouchet, Philippe
text
Zootaxa
2014
3754
3
239
276
journal article
46667
10.11646/zootaxa.3754.3.2
fe375541-8083-43f8-9cf8-b8d75af79599
1175-5326
251551
9E645014-5464-4E7C-8D4A-0B3B52A5AA53
Genus
Hortia
Lozouet, 1999
Lozouet 1999
: 38.
Type
species.
Hortia arriuensis
Lozouet, 1999
(OD).
Locality/Age.
France
: Landes, St-Etienne-d’Orthe (Aquitanian Basin); Upper Oligocene.
Distribution.
Upper Eocene to Upper Oligocene—France; Recent—New Zealand,
New Caledonia
,
Madagascar
.
Diagnosis.
Shell small, slightly exceeding
10 mm
in length, narrowly fusiform, with high spire and long, narrow, slightly abaxially recurved siphonal canal. Protoconch multispiral (fossil species) or paucispiral, bulbous (Recent species). Multispiral protoconchs with more than 4 whorls, last whorls with sharp, opisthocyrt, axial ribs. Spiral sculpture of strong, broadly spaced, narrow spiral cords, intersected by prominent axial ribs, often forming beads on intersections. Cords more closely spaced on canal. Aperture narrow, columella smooth. Outer lip with shallow sinus above periphery in profile.
Operculum absent. Rachidian teeth of the radula with broad, deeply notched, anterior base and large cusp emanating from posterior margin, sometimes with additional lateral serration; lateral teeth high but narrow, pointed, triangular, and scoop-shaped, with small denticles on inner side.
Remarks
.
Hortia
was originally described in the family
Turridae
. It is most similar to
Vaughanites
, differing by a generally shorter, abaxially recurved canal, and by the absence of columellar plaits. It also differs from
Pyramimitra
in having narrower axial ribs (rather than varices) and a longer siphonal canal, and the absence of columellar plaits.
FIGURE 4.
Endiatoma
quadricincta
(Cossmann, 1883)
, Lower Eocene, St-Gobain, Aisne, France.
A–B
. MNHN.F.
A47757
;
C–E
. MNHN.F.
A47757
;
F–G
. MNHN.F.
A47759
Shells of Recent species of
Hortia
are similar to fossil ones, but attain a larger adult size. All Recent species known so far have a non-planktotrophic, bulbous, smooth protoconch rather than the multispiral protoconch of the fossils.