NMITA: Neogene Marine Biota of Tropical America

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Sincola Olsson and Harbison, 1953

Morphologic Description: protoconch 1 3/4 to 3 1/2 volutions; sculpture on early teleoconch present or absent; axial sculpture predominant; parietal ridge present; posterior canal present; thickness outer lip moderate to strong; outer lip extended adapically; anterior canal recurved; dorsal hump absent to prominent; hump to the left of aperture absent to prominent. Mainly a fossil genus; only 3 living species, all in the Eastern Pacific.

Species:
• S. mexicana Jung, 1989.
• S. n. sp A
• S. ? anomala (Gardner and Aldrich, 1919).

I. Sincola s.s.

Morphologic Description: protoconch 3 to 3 1/2 volutions; outer lip protoconch sinusigerous; sculpture on early teleoconch present; hump to the left of aperture absent or weak; dorsal hump absent to prominent; posterior canal well developed; thickness outer lip strong.

Species:
• S.(S.) crassilabrum (Guppy, 1874).
• S.(S.) gurabensis (Maury, 1917).
• S.(S.) sincola (Olsson, 1922).
• S.(S.) amphidyma (Woodring, 1964).
• S.(S.) chiriquiensis (Olsson, 1922).
• S.(S.) daulechica (Marks, 1951).
• S.(S.) galvestonensis (Harris, 1895).
• S.(S.) harbisonae (Olsson, 1964).
• S.(S.) nanniebellae (Maury, 1917).
• S.(S.) pseudohaitensis (Maury, 1917).
• S.(S.) walli (Mansfield, 1925).
Click on picture to see a species description:



(Jung, 1989, Fig. 264.12) (Jung, 1989, Fig.269.1) (Jung, 1989, Fig. 274.10)

II. Subgenus Sinaxila Jung, 1989.

Morphologic Description: protoconch 1 3/4 to 3 1/2 volutions; outer lip protoconch sinusigerous; sculpture on early teleoconch present; axial sculpture present in late teleoconch; dorsal hump weak to prominent; hump to the left of aperture absent or weak; thickness outer lip strong.

Species:
• S.(S.) bassi (Maury, 1917).
• S.(S.) lloydsmithi (Pilsbry and Brown, 1917).
• S.(S.) matima (Olsson, 1922)
• S.(S.) cunninghamcraigi (Rutsch, 1942)
• S.(S.) gunteri (Mansfield, 1930)
• S.(S.) naufraga Jung, 1989
• S.(S.) tumbezia (Olsson, 1922)
• S.(S.) sp A
Click on picture to see a species description:



(Jung, 1989, Fig.281.4) (Jung, 1989, Fig. 289.4) (Jung, 1989, Fig. 291.1)

III. Subgenus Sinuina Jung, 1989.

Morphologic Description: protoconch 3 volutions; outer lip protoconch sigmoid; sculpture on early teleoconch present; axial sculpture predominant in later teleoconch; dorsal hump absent; hump to the left of aperture absent; thickness outer lip moderate; outer lip strongly extended adapically.

Species:
• S.(S.) ecuadoriana (Pilsbry and Olsson, 1941).
• S.(S.) sinuata (G.B.Sowerby II, 1874)

IV. Subgenus Dorsina Jung, 1989.

Morphologic Description: protoconch 2 1/2 to 3 1/2 volutions; outer lip protoconch sigmoid or sinusigerous; sculpture on early teleoconch absent; sculpture on late teleoconch absent; dorsal hump weak to prominent; hump to the left of aperture well developed; posterior canal weak; thickness outer lip moderate; outer lip slightly extended adapically; small angle between axis of columella and main shell axis.

Species:
• S.(D.) caribaea (Gabb, 1873).
• S.(D.) colombiana (Weisbord, 1929).
• S.(D.) dorsata (G.B.Sowerby I, 1832)
• S.(D.) gibberula (G.B.Sowerby I, 1832)
• S.(D.) melajoensis (Jung, 1969)
• S.(D.) pigea (Olsson, 1964)
• S.(D.) pigea ? (Olsson, 1964)
• S.(D.) quirosana (H.K.Hodson, 1931)
• S.(D.) ? lampra (Gardner, 1947)

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