Description
Author: Jan Delsing
Text ID: 85103
Text Type: 1
Page: 0
Created: 2016-08-10 16:30:06 - User Delsing Jan
Language: EN
Text function: [[t:544932,textblock=85103,elang=EN;Description]]
Shell fusiform, nearly cylindrical in the middle, and slightly constricted at base. Protoconch conical of 5 slightly convex whorls, smooth except for a very narrow spiral row of very fine, short axial riblets inside suture, projecting over the very uppermost part of whorls, visible under optical microscope and SEM, 22 riblets on last whorl; last whorl as wide as the earlier whorl of teleoconch, the limit between them obliquely marked by the development of adult sculpture; earlier whorls tapering swiftly to the narrow rounded apex. Teleoconch of 6 whorls, with 3 spiral cords per whorl, crossed at right angles by weaker axial ribs, with a rounded bead at each intersection; beads numbering 24 or 25 on last whorl; the upper beaded cord a little weaker than the other ones. A fourth beaded spiral cord emerging from suture at base of last whorl. Aperture circular. Rare specimens with one more whorl, wider and distorted, but always constricted at base. Plain pale brown in colour, protoconch paler.
Size: total height ranging from 2.3 mm to 2.9 mm; maximum width from 0.7 to 0.9 mm; height of protoconch 0.41 mm; width of protoconch at last whorl 0.31 mm.
Source: Jay, M. & Drivas, J, 2002. The Cerithiopsidae (Gastropoda) of Reunion Island (Indian Ocean)
Author: Jan Delsing
Text ID: 122074
Text Type: 1
Page: 0
Created: 2023-03-21 12:10:13 - User Delsing Jan
Language: EN
Text function: [[t:544932,textblock=122074,elang=EN;title]]
Joculator granata Kay, new species. Length, 2.50 mm; diameter, 0.75 mm. Shell: ovate, cylindrical; with three rows of beaded spiral threads on each whorl; glistening yellow brown. Spire: protoconch of four and one-half wide, conical whorls, the penultimate usually eccentric and suture crimped; teleoconch of five rather straightsided whorls; suture impressed, barely noticeable. Sculpture: three beaded spiral threads on each whorl, base with an obsoletely beaded spiral; beads prominent, circular, separated by about one-half their own diameter; interspaces between spirals about equal in diameter to the beads and with recessed axial threads. Aperture: subcircular; columella nearly straight; siphonal canal short. These cerithiopsids are uncommon, found in beach sand and in sediments to depths of 60 m.
Type locality: Kiholo, Hawaii, from sediments at a depth of 28 m. Holotype: Bernice P. Bishop Museum No. 9774. Paratypes: Australian Museum, British Museum (Natural History), U. S. National Museum.
The minute shells are distinguished from those of other cerithiopsids by their small size, neat pattern of beaded spiral threads, ovate-cylindrical shape, and the crimped suture in the protoconch. They are perhaps closest in shape to the shells of Conciliopsis carrota Laseron, 1955, from Queensland, Australia, but differ in their smaller size and distinctive protoconch. Derivation of name: granata, Latin adj. — having many grains or seeds. Suggested by the pattern of beading comprising the sculpture of the shells.
Kay, E.A., 1979. Hawaiian Marine Shells. Reef and Shore Fauna of Hawaii. Section 4: Mollusca.
Interchangeable taxa
Author: Jan Delsing
Text ID: 85105
Text Type: 19
Page: 0
Created: 2016-08-10 16:33:12 - User Delsing Jan
Language: EN
Text function: [[t:544932,textblock=85105,elang=EN;Interchangeable taxa]]
Our specimens match the description and figure given by A. Kay, 1979 Joculator granata, type locality Hawaii specifically the suture of the protoconch, which A.Kay described as "crimped", this character given as distinctive from the related species. 3 species of Joculator among our material have such protoconchs: Joculator myia differs from J. granata in its smaller size and in its 4.5 teleoconch whorls instead of 6; Joculator skolix differs from it in its protoconch shape, size, and colour; Joculator albocinctum (Melvill & Standen, 1896) differs in the particular colour pattern of the teleoconch. Other species with such protoconchs ( Cerithiopsis vaurisi, Cerithiopsis pickeringae , Synthopsis hadfieldi ) differ from it in having a higher teleoconch, not constricted at the base.
Distribution
Author: Jan Delsing
Text ID: 85104
Text Type: 3
Page: 0
Created: 2016-08-10 16:30:37 - User Delsing Jan
Language: EN
Text function: [[t:544932,textblock=85104,elang=EN;Distribution]]
Réunion. Locality, Found dead in hand-dredged sand at 10-20 m off Saint-Gilles-les-Bains.