In an early stage every somite has its tergal region divided into lateral halves, owing to the late completion of the body on this side.
The heart lies in a pericardial chamber, which is bounded above by the terga and the longitudinal tergal muscles; below by a fenestrated membrane, the pericardial diaphragm.
Tracheal trunks, arising close to the stigmata, ascend upon the tergal wall towards the heart.
A tendency is exhibited to the formation of a metasomatic as well as a prosomatic carapace by fusion of the tergal surfaces of the somites.
Dorsal area of prosoma furnished with two shields, a larger behind representing, probably, the tergal elements of the somites, and a smaller in front, which is freely articulated to the former and folds over the appendages of the 1st pair.
A telsonic tergal shield of greater or less size is always present, which may be imperfectly divided into well-marked but immovable tergites indicating incompletely differentiated somites.
The prae-genital somite wide, not constricted, with large tergal plate, but with its sternal plate small or inconspicuous.
It is represented by a full-sized tergal plate in the Pseudo-scorpiones.
There is also a pair of narrow tergal sclerites interposed between the anterior and posterior shields.
The degree to which the basi-tergal corner of the valve is rounded off varies much even in var.
Internally, the scutal margin is scarcely at all inflected, and the articular ridge is very little prominent: the crests for the tergal depressores are pretty well developed.
As far as can be discerned, the carapace in the pupa, and consequently in the Cirripede, consists only of the tergal elements of the segments; and this seems likewise to be the case with the carapace of the Podophthalmia.
The basal margin is curved nearly continuously, and extends nearly half-way up the valve; hence the basi-tergal corner is largely rounded off.
Crests for the tergal depressores sharp and prominent.
I found a rudiment, namely, a short thin plate of shell, barely visible to the naked eye, extending parallel and near to the tergal margin of the scutum.
The Scuta have their basi-tergal corner much rounded off, as in B.
In the Terga, at the basi-carinal corner, there are usually crests, though sometimes feebly developed, for the attachment of the tergal depressor muscle.
Internally, the surface is roughened with little points: the articular ridge is prominent: the crests for the tergal depressores moderately prominent.
The lower part of the tergal margin is slightly inflected and roughened, where it meets the corresponding lower part of the scutal margin of the terga.
I) these two margins are separately named Tergal and Lateral.
Seen vertically from above, each shows a deep fold, which receives the lower part of the tergal margin of the scutum.
The basal margin is short, and forms an angle above a rectangle with the occludent margin: the tergal margin is straight; the carinal margin is rounded, protuberant, and of unusual length compared to the basal margin.
Valentiana, this ridge on the tergum being folded over towards the scutum, forms a conspicuous furrow, receiving the tergal margin of the latter.
This depression is due to the prominence, variable in degree, of the tergal edge of the recipient furrow in the scuta.
The two sternal feet larger than the two small or rudimentary tergal feet.
Two tergal feet half as long and thick as the pectoral.
Zygospyrida# tetrapoda with two pairs of descending basal feet, one pair corresponding to the anterior or pectoral, the other pair to the posterior or tergal feet of the Hexaspyrida.
H) the paired tergal tubes, directed backwards (constant in all Coeloplegmida).
Odd nasal style with six to eight, the paired pectoral styles with two or three, lateral styles with three to five, andtergal styles with six to nine pairs of branches.
The posterior or tergal branch is again forked near the base, and its two divergent branches are three times as long as the diameter of the fork-thicket.
Basal ring with six radial descending feet (two sagittal, two pectoral, and two tergal feet).
Tergal plate of somite bearing legs of the first pair.
Its tergal plate is usually retained, but its sternal plate is generally suppressed.
In the case of the somites bearing the walking legs the tergal and sternal elements are preserved without fusion with the corresponding plates of the preceding or succeeding somites, so that great flexibility of the body is retained.
The tergal elements of the somites bearing the antennae, mandibles and maxillae appear to be represented by the head-shield or cephalite.
The tergal plate of the somite bearing the toxicognaths always remains distinct and separates the head-shield from the tergum of the first leg-bearing somite.
Chilopods with twenty-one tergal plates as in the typical genera of Scolopendromorpha, but with only fifteen pairs of legs as in the Lithobiomorpha.
Tergal plate of somite, bearing legs of first pair.
The tergal plate of the somite bearing the toxicognaths is suppressed, probably by fusion with the tergum of the first leg-bearing somite.
In the prosomatic region the corresponding muscles are not so clearly defined in Limulus; they are apparently attached to the plastron forming the group of plastro-tergal muscles.
The cervical scutes are arranged in two transverse rows, each of which contains two scutes; and there is no space left between the posterior row and the tergal series.
There are usually six cervical scutes, in two rows, or forming a rhomb, and separated by a distinct interval from thetergal scutes.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tergal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
