Deep-sea “ cephalaspidean ” heterobranchs (Gastropoda) from the tropical southwest Pacific Author Valdés, Ángel John T. Huber text Mémoires du Muséum national d'Histoire naturelle 2008 196 587 792 journal article 978-2-85653-614-8 1243-4442 Cylichna consobrinoides Kuroda & Habe, 1952 Figs 31E, F, 34, 35A, B Cylichna consobrinoides Kuroda & Habe, 1952: 50 . Cylichna consobrina A. Adams, 1862: 152 [ non Cylichna consobrina Gould, 1859 ]. TYPE MATERIAL . — Not examined . TYPE LOCALITY . — C. consobrina : west coast of Jesso , western Hokkaido , Japan . — C. consobrinoides : Mino-Sima [= Mishima], Japan , 115 m . MATERIAL EXAMINED. — Coral Sea . CHALCAL 1: stn D Norfolk Ridge. MUSORSTOM 4: stn DW 225 , 22°52’S , 63, Banc Nova , 22°11’S , 159°14’E , 305 m , 1 dd . — MUSORS- 167°52’E , 590-600 m , 1 dd . — SMIB 3 : stn DW 21 , 22°59’S , TOM 5 : stn 255, Banc Capel , 25°15’S , 159°55’E , 280-295 167°19’E , 525 m , 1 dd . — SMIB 8 : stn DW 193-196 , 22 °59-23’S, m, 1 dd; stn 265, 25°21’S , 159°45’E , 190-260 m , 2 dd ( Figs 168°21-23’E, 491-558 m , 1 dd. 35A, B); stn 291, Banc Argo, 23°08’S , 159°28’E , 300 m , 1 dd; New Caledonia proper . BATHUS 2 : stn DW 724 , Ile des Pins , stn 302, Banc Nova, 22°10’S , 159°23’E , 345-360 m , 1 dd; 22°48’S , 167°26’E , 344-358 m , 1 dd . — Grand Récif Sud , 200 m , stn 341, Chesterfield Islands , 19°46’S , 158°43’E , 620-630 5 November 1976 , 1 dd . m, 1 dd; stn 376, 19°51’S , 158°30’E , 280 m , 1 dd; stn 380, Loyalty Ridge . MUSORSTOM 6: stn DW 391, 20°47’S , 19°38’S , 158°44’E , 555-570 m , 1 lv , dissected (Figs 31E, F); 167°06’E , 390 m , 1 dd. stn 388, 20°45’S , 160°54’E , 500-510 m , 5 dd. — CORAIL 2: Fiji . MUSORSTOM 10: stn DW 1376 , S of Viti Levu , 18°19’S , stn DE 16, Bancs Lansdowne-Fairway , 20°48’S , 160°56’E , 178°09’E , 497-504 m , 1 dd . 500 m , 1 dd. Tonga . BORDAU 2: stn DW 1531, Eua , 21°12’S , 174°56’W , 970- North of New Caledonia . BATHUS 4: stn DW 918, Grand Pas- 983 m , 1 dd. sage, 18°49’S , 163°16’E , 613-647 m , 1 dd. DISTRIBUTION . — Reported from the Japan Sea in 74-115 m (Hori 2000b). Records herein from the Coral Sea , Fiji, New Caledonia and Tonga (Fig. 34), in 200-970 m , live in 550-570 m . DESCRIPTION. — Shell morphology . Length 17 mm , width 6 mm (largest specimen examined). Shell solid, elongate, with nearly parallel sides (Fig. 35A). Only 1 whorl visible, forming nearly the entire shell, with the exception of a small visible portion of the spire. Apex rounded, deeply umbilicate (Fig. 35B), with the aperture lip rising from the left side and forming a short, triangular wing. Anterior end of the shell rounded. Aperture as long as the shell, wider anteriorly and narrowing gradually at about 1/4 of its length. Columellar margin conspicuously thickened. Columella simple, with no folds. Umbilicus closed. Sculpture of about 5 simple spiral grooves near the posterior end and about 8 grooves near the anterior end. These grooves are absent from the central part of the shell, which is covered with faint growth lines. Colour uniform shiny white. Anatomy . The digestive system contains 3 smooth gizzard plates similar in shape and size. All the plates are oval and elongate (Fig. 31F). The radular formula is 16 x 2.1.1.1. 2 in a specimen from the Coral Sea (MUSORSTOM 5 stn 380). The rachidian teeth are broad, with a number of sharp denticles decreasing in size towards the laterals of each plate (Fig. 31E). There is a gap with no denticles on the centre of each rachidian tooth. The innermost lateral teeth are hook-shaped, with a long, strong cusp with 15-20 denticles. The 2 outermost teeth of each row are much smaller, also hook-shaped and lack denticles. Reproductive system unknown. REMARKS. — Cylichna consobrina was described by A. Adams (1862) from Japan in 115 m , with no illustrations. Because this name was preoccupied by Cylichna consobrina Gould, 1859 , also from Japan , Kuroda & Habe (1952) proposed the replacement name Cylichna consobrinoides . This species was redescribed and illustrated by Hori (2000b) who placed it in Adamnestia with no apparent justification. Iredale (1936) introduced the genus Adamnestia with a short description, for species similar to Cylichna and with a radula similar to that of Haminoea . Subsequent authors (Kuroda et al. 1971) broadened the concept of Adamnestia to include other species with a similar shell morphology to Adamnestia peroniana Iredale, 1936 , the type species. Anatomical examination of a specimen of C. consobrinoides shows that the radula morphology is similar to other species of the genus Cylichna , with a rachidian tooth, a large and denticulate innermost lateral tooth, and several smaller outer laterals. Therefore this species is maintained in the genus Cylichna . Cylichna consobrinoides differs from other species of Cylichna here examined in having an elongate shell with the aperture lip rising from the left side and forming a short, triangular wing.