sagitta


sagitta
(plural sagittae))
the otolith in the sacculus, the largest of the otoliths except in Cyprinidae and Siluridae. Also called sacculith. It has been used for identification of species, for identification from remains in the diet of other organisms, and from remains in archaeological sites. The anterior end is pointed and the posterior end is rounded, straight or may be notched. Mesially it has a groove, the sulcus acusticus, which divides the otolith into dorsal and ventral halves and is margined by superior and inferior crests. The posterior branch of the acoustic nerve runs along the sulcus. The expanded anterior opening of the sulcus is called the ostium and has pointed margins, the longest being called the rostrum and the shorter the antirostrum. The posterior end is called the cauda (and may not extend to the otolith margin). The cauda may have dorsal and ventral points, the pararostrum and postrostrum respectively. A narrowing of the sulcus is called the collum and is the focus of sagitta formation. The upper rim is shorter than the lower rim and rims may be scalloped or have bulging domes

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • Sagitta — (lateinische Bezeichnung für „Pfeil“) steht für: Pfeil (Sternbild), das Sternbild Pfeil Sagitta (Anatomie), ein Otolith im Fischohr das Pseudonym des deutsch schottischen Schriftstellers John Henry Mackay (1864–1933) Sagitta (Freundschaftsverein) …   Deutsch Wikipedia

  • Sagitta — Sagitta: Сагитта (лат. Sagitta), или стрелка один из немногих родов щетинкочелюстных, или Chaetognatha Sagitta (лат.) = Стрела, см. также Стрела (созвездие) …   Википедия

  • Sagitta — Saltar a navegación, búsqueda Sagitta puede referirse a: La constelación Sagita Un sinónimo del género botánico Sagittaria Obtenido de Sagitta Categoría: Wikipedia:Desambiguación …   Wikipedia Español

  • sagitta — s.f. [dal lat. sagitta saetta ], ant. [arma da getto che si scaglia con l arco o con la balestra e, anche, oggetto a forma di saetta] ▶◀ [➨ saetta (1)] …   Enciclopedia Italiana

  • Sagitta — Sa*git ta, n. [L., an arrow.] 1. (Astron.) A small constellation north of Aquila; the Arrow. [1913 Webster] 2. (Arch.) The keystone of an arch. [R.] Gwilt. [1913 Webster] 3. (Geom.) The distance from a point in a curve to the chord; also, the… …   The Collaborative International Dictionary of English

  • Sagitta — (lat.), 1) Pfeil; 2) Lanzette …   Pierer's Universal-Lexikon

  • Sagitta [1] — Sagitta (lat.), Sternbild, s. Pfeil …   Meyers Großes Konversations-Lexikon

  • Sagitta [2] — Sagitta, der Pfeilwurm, s. Würmer. S. minima, s. Meeresfauna, S. 536 …   Meyers Großes Konversations-Lexikon

  • Sagitta — SAGITTA, æ, Gr. Τόξον, ου, am Himmel, ist, nach einigen, der Pfeil, womit Herkules den Adler erschoß, der dem Prometheus die immerzu wieder wach sende Leber abfraß. Hygin. Astron. Poët. l. II. c. 15. Nach andern ist es der, womit Apollo die… …   Gründliches mythologisches Lexikon

  • Sagitta — [sə jit′ə] n. [L, lit., arrow] a small N constellation between Vulpecula and Aquila …   English World dictionary

  • Sagitta — Infobox Constellation name = Sagitta abbreviation = Sge genitive = Sagittae symbology = the Arrow RA = 19.8333 dec= +18.66 areatotal = 80 arearank = 86th numbermainstars = 4 numberbfstars = 19 numberstarsplanets = 1 numberbrightstars = 0… …   Wikipedia


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