Paradrillia sultana ( Thiele , 1925)

Li, Bao Quan, Kilburn, Richard N. & Li, Xin Zheng, 2010, Report on Crassispirinae Morrison, 1966 (Mollusca: Neogastropoda: Turridae) from the China Seas, Journal of Natural History 44 (11 - 12), pp. 699-740 : 728-730

Paradrillia sultana ( Thiele, 1925)

( Figure 5B )

Crassispira sultana Thiele, 1925, p 199 (233), pl. 24 (36), fig. 5. Type loc.: Tanzania: off Zanzibar/ Pemba, 5°55.8′S, 39° 01.2′E, 50 m.

Material examined

Yellow Sea. Three specimens, Jianggezhuang, Qingdao, Shandong, 13 September 1973.

ECS. One specimen, 21°30′ to 32°00′ N , 114°00′ to 127°00′ E, 1973.

SCS. One specimen, CN K156 A, 112°30′ E, 21°30′ N, silty mud, 23 m, 7 April 1960 .

Measurements

See Table 1.

Description

Taken from Kilburn manuscript, based on freshest syntypes of Crassispira sultana Thiele, 1925 .

Shell claviform, base relatively short and broad, siphonal canal slightly obliquely truncate, deeply indented, outer lip thin, anal sinus deep, tongue-shaped, slightly adapically inclined, apex broadly rounded, occupying most of sulcus, parietal pad small; stromboid notch shallow; interior of outer lip with six or seven thin, sharp spiral ridges. Early whorls with a subsutural cord separated by a shallow sulcus from a series of node-like ribs, which are not divided by a furrow to form a second row of nodules posteriorly. Subsutural cord compressed but strong on later whorls, sulcus wider, deep and concave. Axial ribs narrow, opisthocline, becoming weak and procurved below suture, forming compressed tubercles at periphery, 13–14 on penultimate whorl, extending onto base; penultimate whorl without a peripheral cord. Base of spire whorls with one to two thin spiral ridges, another in sulcus and several between tubercles; base of last whorl with 10–12 spiral ridges, wide-set except on rostrum, where close and smooth. Basal spiral ridges and axial ribs forming a weak nodose-cancellate sculpture (except on rostrum), their interstices somewhat fenestrate at parietal level. Microsculpture of fine collabral threads.

Glossy, uniform white. Protoconch papillate, of 2.0 whorls, first tilted, smooth, second with a weak angle below midwhorl, and 10 arcuate, opisthocline axial riblets, breadth 0.44–0.46 mm.

Dimensions: 7.9 × 2.9 mm, aperture 1.9 mm.

Distribution

Yellow Sea, ECS and SCS; east Africa. Not previously recorded from the China Seas.

Remarks

A full description of the freshest syntype is given, as this species has been overlooked in the literature. It may have been confused with Paradrillia inconstans ( Smith, 1875) from which it differs in its prominent, angular subsutural cord and deep, narrow sulcus (subsutural groove), which contains only one spiral thread.

Figures

Figure 5. Species of subfamily Crassispirinae. (A) Paradrillia sp. 1 (ECS, CN 0034-2); (B) Paradrillia sultana (ECS); (C) Paradrillia sp. 3 (Bohai Gulf); (D) Paradrillia sp. 2.(ECS).