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Zychaspis
Taxonomy
Zychaspis was named by Janvier (1985).
It was assigned to Cornuata by Sansom (2009); and to Scolenaspididae by Voichyshyn (2011).
It was assigned to Cornuata by Sansom (2009); and to Scolenaspididae by Voichyshyn (2011).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Zychaspis Janvier |
| 2009 | Zychiaspis Sansom p. 112 |
| 2011 | Zychaspis Voichyshyn pp. 151 - 152 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Zychaspis Janvier 1985
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†Zychaspis bucovinensis Voichyshyn 2011
†Zychaspis concinna Voichyshyn 2001
†Zychaspis elegans Balabai 1962
†Zychaspis granulata Voichyshyn 2011
†Zychaspis siemiradzkii Janvier 1985
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| V. Voichyshyn 2011 | Scolenaspidids of average to large size (L 60–80 mm). The width of the shield exceeds its length (L/S 0.6–0.8). The prepineal part of the shield is of equal length to the postpineal one, or somewhat longer (B/C 1.0–1.3). Anterior margin of the shield somewhat narrows and has a prominence (rostral lobe) variously developed. The cornual processes are rather long and narrow. The abdominal part of the shield is short and narrow, having very small and low dorsomedial crest. The hypophyseal division of the nasohypo− physeal opening is almost equal, or somewhat larger than the nasal one. Orbits are relatively small (S/Os 21–22) and oval. Pineal plate is well developed. The dorsal field is narrow and elongated. It slightly narrows frontally. Lateral fields are rather narrow, narrowing in the first third and widening in their posterior part, reaching back not farther than to the middle of the cornual processes. The dermal skeleton is covered with tiny, almost equal in size, densely set tubercles. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| References: Carroll 1988, Kiessling 2004 | |||||
Age range: base of the Lochkovian to the top of the Pragian or 419.62000 to 410.62000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lochkovian | Ukraine | Z. concinna, Z. siemiradzkii (239251 239253) Z. siemiradzkii (239217 239250) | |
| Lochkovian - Eifelian | Ukraine (Ternopil) | Z. granulata, Z. siemiradzkii (237769) | |
| Pragian | Ukraine | Cephalaspis bucovinensis (90348) Z. elegans (239247) Z. siemiradzkii (239249) |