subcentral การใช้

• Whorl sections are subrectangular, sutures sinuous, the siphuncle subcentral.
• Where known, the siphuncle tends to be central to subcentral.
• The siphuncle is small, subcentral, and with recumbent necks.
• It differs in having a subcentral siphuncle with somewhat inflated segments.
• The siphuncle is subcentral, ventral of the dorsal septal flexture.
• The siphuncle is subcentral with segments slightly expanded into the chambers.
• The siphuncle is small, tubular, and subcentral . ( 1964)
• The subcentral siphuncle contains vesicular deposits and a central tube.
• The ligament is straight with an umbo which is central to subcentral.
• The siphuncle is central to subcentral with moderately to strongly inflated segments.
• The nucleus is subcentral, but approaches the basal and columellar margins.
• The siphuncle is small, subcentral, and orthochoantic.
• The operculum is flat inside, with five whorls and a subcentral nucleus.
• The operculum is rounded oval, with four whorls and a subcentral nucleus.
• Position is central or subcentral in early segments, subventral in later adult.
• Sutures are typically slightly sinuous; the siphuncle small, subcentral, and orthochoanitic.
• The siphuncle which is at least 0.35 the shell diameter is subcentral.
• The operculum is slightly concave inside, with six whorls and a subcentral apex.
• The siphuncle is small, subcentral and orthochoanitic.
• The siphuncle is small, tubular, and subcentral . ( Kummel 1964, K413)