Tripterion philoderma Holmes, Nagasawa & Takano, 1993

Frankovich, Thomas A., Ashworth, Matt P., Sullivan, Michael J., Veselá, Jana & Stacy, Nicole I., 2016, Medlinella amphoroidea gen. et sp. nov. (Bacillariophyta) from the neck skin of Loggerhead sea turtles (Caretta caretta), Phytotaxa 272 (2), pp. 101-114 : 109

Tripterion philoderma Holmes, Nagasawa & Takano ( Fig. 32 )

LM morphology: Valve morphometrics are as follows: length 8.5–28.0 μm, maximum width 2.0–4.0 μm, length-to-width ratio 3.3–7.5, n = 75. The transapical striae are radiate in the middle of the valve, 22–26 in 10 μm, n = 34, becoming parallel to slightly convergent at the apices, up to 29 in 10 μm, n = 34. Copulae are open at one end and do not have septa (arrows in Fig. 32 ).

Type:— SOUTH AFRICA. Milnerton, specimens from the teeth of Mesoplodon layardii (strap-toothed whale), 33° 52’ S 18° 29’ E, R. W. Holmes, 6 April 1978 (holotype ANSP! GC 17182a).

Figures

FIGURES 31–32. Tripterion kalamensis and T. philoderma. Type populations, LM, specimens in valve view showing valve and frustule shape, size range, and separated copulae. 31. Tripterion kalamensis (holotype slide ANSP! GC64443a), arrows indicate septum on copula (top arrow) and open end of copula (bottom arrow). 32. Tripterion philoderma (holotype slide ANSP! GC17182a), arrows indicate lack of septa in separated copulae. Scale bars = 10 μm.