| Grooves | Branchiocardiac | extending from the cervical groove, NIGP-DYH-5-6, NIGP-Shen-1, NIGP- |
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| (a) | subparallel to median line | Shen-3, NIGP-Shen-5-6, NIGP-Shen-11, NIGP-Shen-15, NIGP-Shen-17, NIGP- Shen-32-33, NIGP-Shen-39-40, NIGP-Shen-51, NIGP-Shen-53, NIGP-Shen-58, NIGP-Shen-62, NIGPAS-126338, NIGPAS-126344, NIGPAS-126347, NIGPAS-126353, NIGPAS-126366, NIGP-Shen-a, NIGP- Shen-b-c, NIGP-Shen-GM1, sp3, sp8, sp15-17, sp20, sp22, sp24, sp27, Tohoku-U-57254, Tohoku-U-57272 |
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| Antennal (b) | oblique, forming an angle of around 40° compared to dorsal median line, joined posteriorly to the cervical groove |
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| Hepatic (b1) | not visible / not present |
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| Postcervical (c) | not visible / not present |
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| Cardiac (ca) | extending from the branchiocardiac groove, parallel to the cervical groove, fading just before reaching median line |
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| Gastro-orbital (d) | extending anteriorly from the mid-height | |
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| | of the cervical groove, covering halft the | |
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| | distance toward the anterior margin | |
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| Cervical (e1e) | deep, curved, crossing median line around | |
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| | the mid-lenght of shield in medium to | |
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| | large specimens, slightly behind the mid- | |
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| | length of the shield in small specimens (= | |
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| | cephalic region proportionally bigger in | |
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| | small specimens than in larger ones) | |
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| Spines and | Subdorsal | parallel to median line, ending in the NIGP-Shen-1, NIGP-Shen-3, |
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| carinae | | spine of the proximal part of rostrum, | NIGPAS-126346, NIGPAS-126347, |
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| | anteriorly, ending posteriorly a short | NIGP-Shen-GM1, Tohoku-U-57272 |
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| | distance posterior to the level of ocular | |
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| | incision | |
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| Postorbital | paired, dorsal part very close to the | |
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| | subdorsal carina, formed of two spines | |
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| | each continued posteriorly by a short | |
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| | carina fading posteriorly; ventral part | |
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| | formed of at least four spines forming | |
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| | a slightly sinuous line (second spine | |
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| | placed a little higher than the three | |
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| | others) posterior to the ocular incision | |
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| Postrostral | over median line, with at least four spines, NIGPAS-Shen-68, |
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| | located posterior to the rostrum, on the | NIGPAS-126346-126347, NIGP- |
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| | anterior half of cephalic region | Shen-GM1, sp2, sp19 |
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| Ornamentation | Cephalic area | fine granulation NIGP-Shen-1-3, NIGP-Shen-5, NIGP- |
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| Branchial area | fine granulation | Shen-11, NIGP-Shen-19, NIGP- Shen-32-33, NIGP-Shen-35, NIGP- |
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| Above branchial area | fine granulation, slightly coarser than elsewhere | Shen-39, NIGP-Shen-52, NIGP- Shen-58, NIGP-Shen-62, NIGP- |
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| | | Shen-68, NIGP-Shen-a, NIGP- |
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| | | Shen-GM1, NIGP-Shen-RT132, |
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| | | NIGPAS-126339, NIGPAS-126347, |
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| | | NIGPAS-126366, sp2, sp4, sp8, sp11, |
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| | | sp20, sp23, Tohoku-U-57272 |
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| Gastroliths | | circular in outline, relatively flat, one NIGP-Shen-2-4, NIGP-Shen-12-13, |
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| | side convex and rounded, other side | NIGP-Shen-19, NIGP-Shen-26, NIGP- |
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| | with a thick rim and a depression in | Shen-32-34, NIGP-Shen-38, NIGP- |
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| | the middle, generally massive, some | Shen-52, NIGP-Shen-54, NIGP-Shen-a, |
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| | smaller, probably depending on the | NIGPAS-126338, NIGPAS-126346, |
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| | growth stage | NIGPAS-126353, NIGPAS-126366, |
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| | | sp18 |
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