Description
Author: Jan Delsing
Text ID: 131550
Text Type: 1
Page: 0
Created: 2024-12-19 19:59:52 - User Delsing Jan
Language: EN
Text function: [[t:2084179,textblock=131550,elang=EN;Description]]
Description: Shell small, up to 25 mm in length, with up to 10 teleo-conch whorls, short straight siphonal canal (about 0.1 of SL) and weak shoulder. Suture deeply impressed. Protoconch multispiral, of up to 4.75 whorls; upper two whorls smooth, later with axial riblets. Subsutural cord moderately pronounced, occupying half of narrow subsutural ramp, with three crenulated ridges, central one strongly dominating. Subsutural ramp below subsutural cord weakly concave, narrow and ornamented with thickened growth lines. Peripheral cord about 1.5 times broader than subsutural one, gemmate. Gemmae orthocline to weakly prosocline, distinctly bifid, about 40 on last whorl. Peripheral cord nearly median on spire whorls. Anal sinus moderately deep, indenting peripheral cord. Shell base and canal with distinct crenulated spiral cords, weak-ening towards canal tip. Aperture (without canal) about 0.25 of SL. Ground colour white, with numerous irregular brown spots and darker dots on cords. Protoconch cream-white white to yellowish. Radula comprising about 50 transverse rows of teeth. Marginal teeth shoe-shaped, central formation with strong and narrow cusp and lateral extensions with distinct, nearly straight, anterior margin and indistinct lateral and posterior margins.
Etymology: From pseudo (Gr)—false and Gemmula as the ñame of the genus, reflecting false resemblance to some Gemmula species.
Included species:
Pseudogemmula gemmubides (Powell, 1967) n. comb.;
P. pseudogranosa (Nomura, 1940) n. comb.
Remarks: In general shell shape, the new genus resembles Xenuro¬turris, but it differs in the presence of gemmae on the peripheral cord. In the exon capture analysis, Pseudogemmula n. gen. forms a sister group to Deceptigemmula n. gen. with high support, but differs markedly in shell morphology, particularly in the presence of a gemmate peripheral cord and a short siphonal canal.
Distribution: The type species was described from shallow waters of Oahu, Hawaii, in 30 m; here recorded from the South China Sea to New Caledonia and Papua New Guinea in 93-356 m. Pseudogemmula pseudogranosa is recorded from the East China Sea to Japan in 70-160 m (Hasegawa et al, 2000; Li & Li, 2008).
Kantor Y et al, 2024. Generic revision of the Recent Turridae (Neogastropoda: Conoidea)