Laeocathaica carinalis Chen & Zhang, 2004

Figs 2A, 5D, 8, 41F, 47I, J

Laeocathaica carinalis Chen & Zhang, 2004: 341, in Chinese, with erroneous text figure (fig. 334); - Páll-Gergely et al. 2022: 46, figs 9, 10.

New specimens.

HBUMM08300, 3 fma, all dissected,?Wenxian, Gansu Province, 2019-IV, coll. Li, Qi-Shi [李奇石]; DNA voucher HBUMM08300a. HBUMM8453, many fms, Shifangzhen [石坊镇], Wenxian, Gansu Province, near point (33.00509°N, 104.579061°E), 2021-IX-27, coll. Chen, Z.-G. HBUMM8455, Town of Wenxian, Gansu Province, near point (32.944361°N, 104.679819°E), 2020-VIII, coll. Chen, Z.-G.

Additional information of shell.

In juveniles, regularly arranged fine threads and elongate granules are present on the protoconch, where in adults such sculpture is difficult to be observed because of erosion. Spiral grooves are present after the fourth whorl or only on apical body whorl, but are absent in umbilical side. The teleoconch has distinct and regularly arranged ribs, among which there is no fine threads.

Distribution.

Gansu: Wenxian (type locality).

General anatomy.

Eversible head wart not prominent, perhaps due to specimen of not full maturity. Jaw arcuate, with five projecting ribs.

Anatomy of genital organs.

Penial sheath moderately long, covering ~ 1/4 of penis. Penis slightly expanded distally. Accompanied with two or three lower pilasters, at proximal 1/2 of penis two thin penial pilasters fusing into one Y-shaped fork. Fine pilasters of distal 1/2 penis weaving into delicate net. Near epiphallic opening numerous fine pilasters merging into ~ 4 short but thick folds. Vas deferens narrow throughout. Vagina between atrium and dart sac not elongated. Vagina between dart sac and insertion of bursa copulatrix duct ~ 1/2 length of dart sac. Dart sac ~ 2/3 length of penis. Information of love dart unknown. Accessory sac small. Mucous glands ~ 4, each complicatedly branched. Proximal accessory sacs two, symmetrical on dart sac, dorsally separated and ventrally touching, internally smooth (without pilasters), each with an opening leading to dart chamber near dart chamber opening. Bursa copulatrix duct of even diameter.