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Crassiproetus crassimarginatus

Trilobita - Proetida - Proetidae

Taxonomy
Calymene crassimarginata was named by Hall (1843).

It was recombined as Proetus crassimarginatus by Hall (1859), Hall (1862) and Hall (1876); it was recombined as Phillipsia crassimarginata by Billings (1861); it was recombined as Proetus (Crassiproetus) crassimarginatus by Stumm (1953); it was recombined as Crassiproetus crassimarginatus by Lieberman (1994).

Synonymy list
YearName and author
1843Calymene crassimarginata Hall p. 172 fig. 5
1859Proetus crassimarginatus Hall p. 88
1861Phillipsia crassimarginata Billings p. 362
1862Proetus crassimarginatus Hall p. 100
1876Proetus crassimarginatus Hall figs. PI. 20, Figs. 21-23, 26-31; non Figs. 20, 23-24
1953Proetus (Crassiproetus) crassimarginatus Stumm pp. 15 - 17 figs. PI. I, Figs. 2-13; PI. 11, Figs. 9-10
1994Crassiproetus crassimarginatus Lieberman pp. 71 - 73 figs. 17.1-17.6, 17.8, 17.10-17.14, 18

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
Life
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
orderProetidaFortey and Owens 1975
superfamilyProetoideaHawle and Corda 1847
familyProetidaeSalter 1864
subfamilyCrassiproetinaeOsmólska 1970
genusCrassiproetus()
speciescrassimarginatus(Hall 1843)

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.

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Diagnosis
ReferenceDiagnosis
E. C. Stumm 1953Cephalon semicircular with a relatively broad, flat brim, becoming low convex opposite the ocular platforms and having a longitudinally striated border. Glabella moderately convex, subquadrate, tapering very slightly anteriorly, with a rounded anterior margin. Glabellar furrows lacking on test, very faintly indicated on internal molds. Anterior and medial pairs slightly convex anteriorly, directed posterolaterally, extending about two thirds the distance to the axis. Posterior pair directed laterally for about one third their length, then becoming deflected posteriorly, extending one half the distance between the point of deflection and the occipital furrow. Occipital lobes subtrigonal, relatively large but low and inconspicuous. Occipital furrow relatively narrow, well impressed. Occipital ring smooth, relatively wide and low convex posterior to glabella, becoming thinner posterior to ocular platforms. Anterolateral preglabellar fields subtrigonal, low convex. Palpebral lobes very small, subtrigonal, with a rounded peripheral angle. Eyes relatively small, elongate, reniform, not as high as crest of glabella. Free cheeks with gently arched ocular platforms, slightly convex brims, and rounded genal angles.

Thorax with moderately convex axis composed of smooth, flat-topped or low-convex segments. Pleurae with low-convex segments bearing deeply incised medial grooves. Grooves becoming obsolete peripherally.

Pygidium highly convex with a low-convex, peripherally sloping brim.

Axis of higher convexity than pleurae, composed of about 16 smooth, low convex segments. Pleurae sloping steeply peripherally, composed of about 14 segments. Segments faintly developed posteriorly.
B. S. Lieberman 1994Genal spines absent; SO at anterior edge ofintraoccipital lobe flexes sharply outward; genal angle deflected posteriorly; SO at midline weakly incised; posterior border furrow kinks anteriorly distal to eye, then flexes posteriorly; length (sag.) of anterior cephalic border to length ofcephalon 0.15-0.16; pleurae laterally curving sharply posteriorly; top of pleural segments in lateral view flattened; medial kinks on pygidial axial rings visible on all but 25% most posterior rings; ratio of pygidial width-length 1.1-1.23; pygidial axis separated from border by small space.
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesf
Adult length: 10 to < 100f
Adult width: 10 to < 100f
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: deposit feedero
Vision: well-developedf
Created: 2009-06-11 18:30:23
Modified: 2009-12-19 04:35:55
Source: f = family, o = order, c = class
References: Hendy 2009, Fortey and Owens 1999, Aberhan et al. 2004

Age range: base of the Eifelian to the top of the Givetian or 393.30000 to 382.70000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Eifelian393.3 - 387.7USA (New York) Proetus crassimarginatus (230486)
Eifelian393.3 - 387.7USA (Virginia) Proetus crassimarginatus (6993)
Eifelian393.3 - 387.7Canada (Ontario) Proetus crassimarginatus (3844) Proetus crassimarginatus, Crassiproetus crassimarginatus (3845)
Middle Devonian393.3 - 382.7USA (Indiana) Proetus crassimarginatus (11101)
Givetian387.7 - 382.7USA (Indiana) Proetus crassimarginatus (170009)