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Showing results for tags 'house range marjum formation of central utah'.
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From the album: MY FOSSIL Collection - Dpaul7
Hypagnostus parvifrons Trilobite House Range, Marjum formation of central Utah Cambrian Period (570-540 million years ago) Trilobites of the order Agnostida are mmall trilobites (usually only a few mm long) with cephalon and pygidium strongly similar in outline and size (isopygous); enrollment typical. Cephalon: cephalic shield with deeply parabolic outline, maximum width usually anterior of genal angle, sutures proparian or lacking; border convex; glabella fusiform, widest at base (except in Condylopygidae), glabellar segmentation highly variable, sometimes complex, but in some species entirely effaced; most species eyeless; hypostome natant, specialized with ribbon-like wings; rostral plate lacking (or uncalcified). Thorax: segments 2 (Agnostina) or 3 (some Eodiscina), axis typically broad, short fulcrate pleurae. Pygidium: strongly isopygous; pygidial margin typically closely matching cephalic margin. Occurrence: L. Cambrian to U. Ordovician (Ashgill). Kingdom: Animalia Pylum: Arthropoda Class: †Trilobita Order: †Agnostida Family: †Spinagnostidae Genus: †Hypagnostus Species: †parvifrons -
From the album: MY FOSSIL Collection - Dpaul7
Hypagnostus parvifrons Trilobite House Range, Marjum formation of central Utah Cambrian Period (570-540 million years ago) Trilobites of the order Agnostida are mmall trilobites (usually only a few mm long) with cephalon and pygidium strongly similar in outline and size (isopygous); enrollment typical. Cephalon: cephalic shield with deeply parabolic outline, maximum width usually anterior of genal angle, sutures proparian or lacking; border convex; glabella fusiform, widest at base (except in Condylopygidae), glabellar segmentation highly variable, sometimes complex, but in some species entirely effaced; most species eyeless; hypostome natant, specialized with ribbon-like wings; rostral plate lacking (or uncalcified). Thorax: segments 2 (Agnostina) or 3 (some Eodiscina), axis typically broad, short fulcrate pleurae. Pygidium: strongly isopygous; pygidial margin typically closely matching cephalic margin. Occurrence: L. Cambrian to U. Ordovician (Ashgill). Kingdom: Animalia Pylum: Arthropoda Class: †Trilobita Order: †Agnostida Family: †Spinagnostidae Genus: †Hypagnostus Species: †parvifrons