ungula


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ungula

[′əŋ·gyə·lə]
(mathematics)
A solid bounded by a portion of a circular cylindrical surface and portions of two planes, one of which is perpendicular to the generators of the cylindrical surface.
(vertebrate zoology)
A nail, hoof, or claw.
References in periodicals archive ?
The genera Obolus Eichwald, 1829 and Ungula Pander, 1830 have been recognized by Popov and Khazanovitch in Popov et al.
1989 Ungula inornata (Mickwitz); Popov & Khazanovitch, p.
1999 Ungula inornata (Mickwitz); Cusack, Williams & Buckman, p.
Ungula inornata is the replacement name for Obolus triangularis Mickwitz, 1896.
According to cladistic analysis of the chemico-structural characters of the shell, Ungula is phylogenetically closely related to the genera Obolus Eichwald, 1829, Oepikites Khazanovitch & Popov, 1984 (in Khazanovitch et al.
Among the species of the genus Ungula, the shell structure of Ungula ingrica is best known.
The BSE image of a fragment of Ungula convexa Pander, 1830, the type species of the genus Ungula, by Popov & Holmer (2003, fig.
1999; Williams & Cusack 1999, 2007), the shell structure of the representatives of the genera Obolus and Ungula is rather similar.
The secondary layer of the studied valve of Ungula inornata has baculate symmetrical shell structure (cf.