Clypeomorus subbrevicula (Oostingh 1925)

Clypeomorus subbrevicula (Oostingh)

Cerithium breviculum Sowerby, 1834:213, unnumbered pl.: fig. 1 [type material not found, Sowerby's fig. 1 here selected to represent lectotype; type-locality: Philippines; not Cerithium breviculum Deshayes, 1833].—Kiener, 1841–1842:53–54, pl. 15: fig. 4.—Sowerby, 1855:869, pl. 181: fig. 143; 1865, pl. 7: fig. 46.—Tryon, 1887:132, pl. 23: fig. 18.—Martens, 1897:174.—Kobelt, 1898:245, pl. 42: fig. 18.

Cerithium humile Dunker, varietas [sic],—Lischke, 1875:50, pl. 3: figs 19, 20 (in part).

Cerithium subbreviculum Oostingh, 1925:45 [new name for Cerithium breviculum Sowerby, 1834].

Clypeomorus subbreviculus (Oostingh).—Shirai, 1977:275.

DESCRIPTION.—Shell (Figure 50; Table 29): Adult shell stocky, short, and thick with overall rounded ovate shape, and reaching 28 mm in length (not included in Table 29). Teleoconch comprising 8 or 9 inflated whorls that have an apical angle of about 50 degrees. Length/width index 1.72. Whorls rounded, with subsutural ramp below, which consists of 2 major beaded spiral cords. Whorls sculptured with numerous incised spiral lines and smaller spiral cords that are usually beaded. Subsutural spiral cord has many small axial plications. Fine axial incised lines give overall scaly appearance to shell. Beads of 2 major spiral cords elevated, sometimes pointed, and aligned to form 12 or 13 axial ribs limited to lower part of each whorl. No varices present. Suture deeply impressed, wavy. Protoconch unknown. Early postnuclear whorls usually badly eroded or missing. When present, early whorls sharply tapered, straight-sided, presenting concave appearance and sculptured with 2 smooth spiral cords. Body whorl very large, inflated and rounded, constricted at base and with slight siphonal fasciole. Apertural side of body whorl rounded. Body whorl sculptured with 6 or 7 beaded spiral cords. Beads drawn out spirally and aligned to form axial ribs. Aperture large, ovate, a little less than half the shell length. Shell length/aperture length index 2.53. Anterior siphonal canal short, deep, and at 65 degrees angle to left of shell axis. Anal canal deeply incised, bordered with columellar fold that extends well into shell aperture. Columella concave with thick parietal callus and distinct columellar lip. Outer lip rounded, thick, moderately crenulate, with beveled inner surface bearing numerous spiral plications. Parietal portion of outer lip in line with suture, not extending onto penultimate whorl. Plane of outer lip parallel to shell axis. Periostracum thin, usually eroded. Shell color dirty gray or brown with black or brown beads. Aperture and columella white. Operculum sub-circular, thin, corneous, and paucispiral with eccentric nucleus near opercular edge. Attachment scar elongate, limited to bottom portion of operculum.

Radula (Figure 51; Table 30): Radular ribbon long, a little less than one-third the shell length, comprising 140 rows of teeth in snail 21 mm long. Shell length/radula length index 2.94. Rachidian tooth (Figure 51c) pentagonal, about 33 μm wide. Base of rachidian tooth triangular with central pointed buttress that slightly overhangs tooth base. Central buttress with a tiny pointed projection flanking each side. Sides of rachidian tooth straight, top concave. Cutting edge of rachidian tooth has large spade-shaped central cusp flanked on each side by one tiny blunt denticle. Lateral tooth (Figure 51b,c), large, rhomboidal, with long twisted basolateral projection that inserts onto radular membrane. Basal plate of lateral tooth has long semimedian buttress-like projection that extends ventrally. Top of lateral tooth straight, bearing broad, chisel-like central cusp that is flanked on inner side by single tiny pointed denticle and on outer side by 2 small pointed denticles. Where outer denticle ends, basal plate extends dorsally and is slightly reflected to form large flange. Marginal teeth (Figure 51d) long, curved, having broad shafts with tapered bases, and curved spatulate tips. Tip of inner marginal tooth bearing wide central cusp flanked on each side by single tiny pointed denticle that is almost fused to central cusp. Outer marginal tooth same, only lacking outer denticle.

Animal: Preserved animal gray with black spots and lines. Mantle edge has thick white papillae. Semicircular jaws about 0.5 mm long. Buccal mass large. Internal anatomy unknown.

MATERIAL EXAMINED.—INDIA: Waltair (USNM). INDONESIA: (ANSP 319225); Keledjitan, Bantam, Java (USNM 260543); Wynkoopsbaai, Java (ZMA); Bali (AMS); Uki, Buru Id, Moluccas (USNM 233015); Morotai, Halmahera Group, Moluccas (USNM 542545, 542541); Gulf of Ende, Flores (ZMA); Maumere, Flores (UF 24766); Timor (ZMA); Taganac Id, Borneo (USNM 243940, 243944). NEW GUINEA: Huron Gulf (USNM 487915); Dogura, near Milne Bay (AMS); Rabaul, New Britain, Bismark Archipelago (AMS); Kavieng, lower archipelago, New Ireland (ANSP 185279). NEW HEBRIDES: Eromanga (AMS); N coast, Efate (AMS). AUSTRALIA: Hartley's Creek, N Queensland (AMS). NEW CALEDONIA: Poindimie (AMS); near Kunie, Port Kuto, Île des Pins (AMS); E of Prony Village, Prony Bay, (USNM 724822, 724865); SW of old mine wharf, N side N'go Bay (USNM 664678, 664677); Thio (ANSP 238385); 18 km N of Touho (ANSP 270416); Port Ngea, Magenta Station, Nouméa (ANSP 271133). RYUKYU ISLANDS: Osima, Osumi (USNM 343868, 488034); Okinawa (USNM 774531, 671091); Metasaki Bay, Okinawa (LACM 7332, 27653, 29937); Amamioshima (USNM 669825); Nase, Oshima Id (ANSP 363740); Metasaki Reef, Okinawa (ZMA; LACM 72023; Gushiken-wan, 3 mi (5.6 km) E Bisezaki, Okinawa (LACM 77-58). PHILIPPINES: Sabtang Id, Batanes Group (USNM 243917); Port Pio V., Camiguin Id, Babuyan Group (USNM 233073, 233074, 243709, 243710); Subic Bay, Luzon (USNM 593855); W shore, Subic Bay, Luzon (USNM 543334); Port Binang, Subic Bay, Luzon (USNM 243717); Jamilo Bay, Luzon (USNM 243950, 243952, 774574); Mariveles Bay, Luzon (USNM 239784); W coast Palaui Id, Luzon (USNM 232923, 243711); Nasugbu, Luzon (USNM 232859); Besogo, Luzon (USNM 232907); Dagupan, Luzon (USNM 232843); Eman Pt, Morong, Bataan, Luzon (USNM 774758); Napot Pt, Bataan, Luzon (USNM 774680); Cabcaben, SE Bataan, Luzon (ANSP 229745, DMNH 2719); N shore, Ft Mills, Cavite, Luzon (USNM 472941); Villa Carmen, Bataan, Luzon (LACM 89036); Tabgayag Bay, Luzon (USNM 244192); Mansalay River, Mindoro (MCZ); Gigmoto, Catanduanes Id (ANSP 223149); Cabugao River (USNM 232880); Guiulugan, Negros (USNM 232853, 232856, 244055, 44047); mouth of Siaton River, Siaton, Negros Oriental (USNM 598124); E side Jagbolaran Strait, Bohol (USNM 244084); Gajoagan Id, off N Samar (USNM 233203); Taliray, Cebu (USNM 774563); N Cebu at Tayud, Cebu (UF 30348); Capanuypugan Pt, Mindanao (USNM 243890); Bali, Pujado Bay, Mindanao (USNM 243902); Sarangani Bay, Mindanao (USNM 233128).

Clypeomorus subbrevicula is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae.