Lightbournus rendatus, Simone, 2024

Genus Lightbournus Lyons & Snyder, 2008 View in CoL Lightbournus rendatus new species

( Fig. 32 View Figure 32 ) https://zoobank.org/ F4F343F7-7017-4163-9D8C-90EA432616D0

Type: Holotype MNHN-IM-2000-39808, shell. Paratype: MZSP 105535, 1 shell from type locality.

Type locality: BRAZIL. Espírito Santo ; ItaÚnas, off, continental slope, 18°59′S 37°50′W, 637 m [ MD55 sta. DC76 , RV Marion Dufresne col., v.1987] GoogleMaps .

Diagnosis: Shell heavy, with thick walls. Axial and spiral sculpture very developed. Axial threads bearing superior notch. Canal broad, wide, distal end rounded.

Description: Shell about 23 mm. Fusiform, ~twice longer than wide; spire~47% of total length, last whorl ~69% of total length. Spire angle ~40°. Spire up to 8 convex whorls ( Fig. 32G View Figure 32 ); suture marked by wide, deep furrow. Protoconch ~2.7 smooth whorls ( Fig. 32F, M View Figure 32 ), yellow. Sculpture of 7 low spiral cords, of rounded profile, narrow and wide cords intercalated, located close to each other; additionally possessing strong, narrow, tall, round- ed axial threads (10 in penultimate whorl); axial cords becoming particularly larger on these axial threads, especially wide cords; superior region winged, notched with suture ( Fig. 32B, D View Figure 32 ). Last whorl with ~15 spiral cords and 9 axial threads similar to those of preceding whorls; same spiral sculpture along siphon, as oblique cords ( Fig. 32B, D, H, L View Figure 32 ). Aperture elliptic, ~1.5× longer than wide; no anal notch detectable ( Fig. 32A, C, K View Figure 32 ). Canal relatively conic, weakly arched, widely opened ( Fig. 32H View Figure 32 ), with 20% of shell length, and ~38% of last whorl width in its base. Outer lip thick, similar to thread; internally 8-9 uniform lirae ( Fig. 32A, C, I, J, K View Figure 32 ); extending along preceding whorls ( Fig. 32E View Figure 32 ). Inner lip weakly concave, callus narrow, thin, not exceeding apertural limit; pair of transverse, separated folds in left base of siphon ( Fig.32J View Figure 32 : arrow); another similar fold in superior region preceding superior end ( Fig. 32I View Figure 32 : arrow). Walls thick ( Fig. 32E View Figure 32 ). Each whorl bearing inferior furrow ( Fig. 32E View Figure 32 : arrow). Umbilicus absent.

Etymology: The specific epithet is a Latinization of the Portuguese word "renda", meaning knitting, crochet and lace, in allusion to the delicate and complex sculpture of the shell.

Distribution: Only known from type locality.