cleithrum

cleithrum

[′klī·thrəm]
(vertebrate zoology)
A bone external and adjacent to the clavicle in certain fishes, stegocephalians, and primitive reptiles.
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The cleithrum is similar to both Proterocara and Mahengechromis from the Eocene of Argentina and Tanzania, respectively, but closer to Proterocara in form (Murray, 2001a; Malabarba et al.
Fish species were identified based on morphological differences of the following fish parts: os maxillare, intermaxillare, dentale, pharyngeum, operculare, praeoperculare, cleithrum, basioccipitale, praevomer, and chewing pads (Carss & Marquiss 1999, Cech et al.
7a Cleithrum, under the operculum, with a furrow (groove) on the ventral side, a large papilla-like structure immediately above the groove; eye nearly covered by an adipose eyelid, forming a vertical slit on the center of the pupil: Selar crumenophthalmus
The long, mid-posterior preopercular spine extended beyond the cleithrum.
The cleithrum is broad, with a broad but short anteroventral expansion.
Stridulation sounds in channel catfish are produced during pectoral spine abduction (forward fin sweeps), when ridges on the spine's base rub against a bony part of the pectoral girdle called the cleithrum.
However, most gonorynchiforms examined by us exhibit a well-developed, paired ossification that is usually named 'cephalic rib' but that is strikingly similar to the ossified Baudelot's ligament of teleosts such as catfishes, connecting the cleithrum and/or supracleithrum to the posteromesial surface of the neurocranium (usually exoccipital and/or basioccipital) (e.
Se ubica dorsolateralmente en la cintura pectoral articulada a la escapula; tiene una parte cartilaginosa que esta ubicada dorsalmente y otra osea lateralmente que recibe el nombre de cleithrum.
These modifications include the following: (1) the presence of a kinetic joint between the cleithrum and supracleithrum that permits extensive anterior-posterior movement of the pectoral girdle; and (2) a greatly enlarged first branchiostegal ray and associated hyohyoideus abductor muscle that form a functional coupling with the hyoid bar [ILLUSTRATION FOR FIGURE 2 OMITTED].