episternum


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episternum

[¦ep·ə′stər·nəm]
(vertebrate zoology)
A dermal bone or pair of bones ventral to the sternum of certain fishes and reptiles.
References in periodicals archive ?
The geniohyoideus medialis is, throughout its length, about half the width of the geniohyoideus lateralis at mid throat, at the level of the episternum it is one-third the width of this structure; the geniohyoideus lateralis arises from the mandible next to the attachment of the submentalis and at mid-throat occupies almost one-half of the area between the geniohyoideus medialis and the mentomeckelian bone, it widens from rostrum towards intermandibular region.
The lower portions of pronotal lateral lobes, a large area on lower portion of episternum 2, and distal portion of episternum 3 are whitish.
Pronotal episternum in lateral view projects beyond the adjacent anterior margin of the pronotal lobes, and is asymetrically rounded at its tip (Fig.
Tegument mostly smooth, some rugose areas on lobes of metazona of pronotum, mesothoracic epimeron, metathoracic episternum, and in the female on the expanded terga of the metathorax and 1st abdominal segment.