Stromboidea

• Struthiolariidae
  • Struthiolaria
    • Struthiolaria subspinosa Marwick, 1924

Original Description of Struthiolaria subspinosa by Marwick, 1924:

• "Shell of moderate size, ovate, with gradate spire about equal in height to aperture; whorls 8, including protoconch, sharply angled above middle, with a somewhat flat shoulder, whorls immediately after protoconch convex, body-whorl bicarinate, concave between shoulder and lower keel, base very rapidly contracted; apex conoidal, of 2 smooth whorls, nucleus minute, planorbid; sculpture, angle of shoulder furnished with small sharply-pointed laterally-elongated tubercles, 14–20 on body-whorl, 18–25 on the penultimate, and about 30 on each spire-volution; keel of body-whorl obsoletely nodular, and base often with weak cinguli, of which the one nearest keel is sometimes stronger, giving the shell the suggestion of a double keel; the whole surface covered with fine, sharp, spiral threads, with wide interstices, 8 on first two convex whorls, 10 on third, the sixth thread from top being moniliform and marking the subangled shoulder, 7 above the finely-tuberculated shoulder of fourth whorl and 9 below, 9 above and 10 below on fifth, 10 above and 17 below on penultimate, the growth-lines very fine; on early whorls a strong spiral cord midway between angle and anterior suture, making whorl bicarinate; suture linear, not impressed; aperture ovate, angled above, produced below into very short canal; outer lip reflexed, thickened, wedge-shaped in cross-section, sinuous, not greatly produced at shoulder, more so opposite lower keel; inner lip with moderate regular callus, barely surmounting keel, and little wider than outer lip; columella concave, bent to right below, ending in beak."

Locus typicus: White Rock River, Pareora, Timaru District, Canterbury, South Island, New Zealand

Stratum typicum: Miocene

Struthiolaria subspinosa in Marwick, 1924; Pl. 11, fig. 4 and 9; Copyright Royal Society of New Zealand / National Library of New Zealand

Struthiolaria subspinosa Marwick, 1924; Miocene; White Rock River, Pareora, Timaru District, Canterbury, South Island, New Zealand; 43 mm; Coll. BM(NH), No. G.50020; Copyright BM(NH)

Struthiolaria subspinosa Marwick, 1924; Clifdenian, Lower Miocene; “Slip Point”, Clifden, Waiau River, South Island, New Zealand; 46 mm (upper); 37 mm (lower); Coll. BM(NH); Copyright BM(NH)

References:

• Marwick, 1924