science

Judeasaurus

Judeasaurus is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Judeasaurus rather than just read about it. In short: Judeasaurus is an extinct genus of small, aquatic varanoid lizard related to the mosasauroids. The only known specimen is from the Late Cretaceous of the Judean Hills and the West Bank Palestine, though its exact provenance is uncertain.

Key takeaways

Judeasaurus belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Judeasaurus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Judeasaurus from memory before moving on to harder problems.

Reference excerpt

Judeasaurus is an extinct genus of small, aquatic varanoid lizard related to the mosasauroids. The only known specimen is from the Late Cretaceous of the Judean Hills and the West Bank Palestine, though its exact provenance is uncertain.

Description The specimen consists of an incomplete but partly articulated skull and a number of cervical vertebrae exposed in ventral view on a small slab of pink-grey limestone. The skull includes a fragmentary right maxilla (with teeth), the co-ossified frontals and parietals, right jugal, postorbitofrontals, supratemporals, squamosals, quadrates, the right dentary and fragmentary postdentary bones; the occipital region of the skull is hidden beneath a calcareous deposit. Some elements, such as the jugals, are preserved only as impressions. The skull is small, measuring only 60–70 millimeters in length.

History There is some doubt surrounding the provenance of the holotype and only known specimen (HUJI P4000, Hebrew University of Jerusalem), though it was likely recovered from the Judea Group, either from the upper Laminated Limestone Member of the Kefar Sha'ul Formation (Upper Cenomanian) or the lower member of the Bina Formation (Lower Turonian), based on an examination of the lithology of the limestone matrix and planktonic fossil foraminifera preserved in the same slab.

Taxonomy and naming The genus is named for the Judean Hills where the holotype of Judeasaurus tchernovi was discovered ("Judea lizard"), and the etymology of the species name honours Eitan Tchernov for his contributions to the paleontology of Israel. Haber and Polcyn (2005, p. 249) diagnose Judeasaurus tchernovi as a varanoid lizard:

distinguished from other varanoids by the conical shape of the parietal process of the supratemporal and the way it is nested syndesmotically within the lateral wall of the parietal suspensorial ramus, and by the following unique combination of characters: broad premaxilla, nasal capsule floored by the anterior part of the maxilla, postorbitofrontal-parietal contact at least as extensive postorbitofrontal-frontal contact, suspensorial arcade is almost vertical, concave 'question-mark'-shaped quadrate with well-developed suprastapedial process and tympanic ala, fused frontals, M-shaped frontoparietal suture, weakly developed descending processes of the frontal, moderately retracted nares, closely spaced teeth with narrow bases, 14-16 mandibular teeth, no plicidentine. Haber and Polcyn (2005, 251-254) compare Judeasaurus with other marine varanoids (Adriosaurus and Pontosaurus), basal mosasauroids (including Tethysaurus, Haasiasaurus, and Halisaurus) and with members of the paraphyletic Aigialosauridae, and determined that Judeasaurus "represents a new taxon within Varanoidea, related to mosasauroids based on its fused frontals and circular quadrate." An affiliation with another group of Late Cretaceous marine varanoids, the Dolichosauridae, is proposed but this relationship remains unresolved due to the poorly understood nature of dolichosaurs.

References Haber, A. et Polcyn, M. J. 2005. "A new marine varanoid from the Cenomanian of the Middle East." Netherlands Journal of Geosciences (Geologie en Mijnbouw) 84 (3):247-255.

Worked examples

Example 1 — a first encounter with Judeasaurus

Start with the simplest possible case. Write down what Judeasaurus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Judeasaurus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Judeasaurus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Judeasaurus

In research: Judeasaurus appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Judeasaurus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Judeasaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous lizards, Extinct animals of Asia, Fossil taxa described in 2005, so understanding it makes those chapters shorter.
In everyday life: Look for Judeasaurus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Judeasaurus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Judeasaurus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Judeasaurus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Judeasaurus in simple terms?

Why does Judeasaurus matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Judeasaurus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Judeasaurus.