Hyalosynedra, Sabir, J. S. M., Theriot, E. C., Lobban, C. S., Alhebshi, A. M., Al-Malki, A. L., Hajrah, N. H., Khiyami, M. A., Obaid, A. Y., Jansen, R. K. & Ashworth, M. A., 2018

Sabir, J. S. M., Theriot, E. C., Lobban, C. S., Alhebshi, A. M., Al-Malki, A. L., Hajrah, N. H., Khiyami, M. A., Obaid, A. Y., Jansen, R. K. & Ashworth, M. A., 2018, Systematics of araphid diatoms with asymmetric rimoportulae or densely packed virgae, with particular attention to Hyalosynedra (Ulnariaceae, Bacillariophyta), Phytotaxa 347 (1), pp. 1-49 : 16-18

Hyalosynedra al-shareefii Sabir and Theriot sp. nov. ( Figs 33–36 )

Holotype:— ANSP G.C. 38099

Isotypes: — KSA 2015-3, Theriot collection at the UT Austin

Type locality: Shallow, protected sandy swimming area at Bhadur Resort, Jeddah, Kingdom of Saudi Arabia (21 ° 45.38’ N, 39 ° 03,15’ E).

Material studied: Wild and cultured ( UTKSA 0253) material isolated from the type locality: KSA 2015-3, scrapings from a large submerged rock in a shallow, protected sandy swimming area at Bhadur Resort, Jeddah, Kingdom of Saudi Arabia (21 o 45.38’ N, 39 o 03,15’ E). Wild and cultured ( KSA 0100) material isolated from the same locality: SA 9, epiphytes collected from the submerged part of a boat in a small marina south of the Islamic port near Jeddah, Kingdom of Saudi Arabia (21 o 16.26’ N, 39 o 07,26’ E).

Description: —Measured specimens were 13.4–33.3 μm long and 2.5–5.1 μm wide ( Figs 33, 34 ). Margins were convex, converging to a rounded to protracted apex. The sternum was observed to be relatively prominent for a Hyalosynedra , and linear along the length of the valve face ( Fig 33 ). Striae biseriate. Virgae 53–57 in 10 μm. Pore densities in the strongly sunken ocellulimbi were 7–10 in 1 μm, and the pore field was generally 5–6 pores wide by 3 pores tall ( Fig. 36 ). The ocellulimbi were overhung by one or two very small bumps or spinules. Girdle bands found were without pores and all were open ( Figs 34, 36 ).

Remarks:— Although valves tended to be shorter than those of H. al-turkii, specimens of H. al-shareefii were generally wider. Whereas the margins of H. al-turkii were more or less evenly curved along the entire length of the valve, those of H. al-shareefii were more nearly parallel in the center becoming more strongly convex as they approached the apex.

Etymology: —This species was named for Prof. Dr. Abdulmohsen Rajeh Al-Shareef, Vice Dean for Research, Deanship of Scientific Research, King Abdulaziz University (KAU), Jeddah 2158, KSA for his support of our international collaboration.

Figures

FIGURES 33–36. Hyalosynedra al-shareefii from KSA0100.33. LM of entire valve showing thick sternum.34. SEM of partly dissociated frustule showing external and internal views along with simple, unornamented girdle bands. 35. SEM interior detail of apex. 36. SEM detail of apex and girdle bands of partly dissociated frustule.