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Nasco Dogfish Shark (Squalus) - Size: 18"-22"; Injection: Plain Lab Specimen - LS03575: Phylum Chordata Subphylum Vertebrata Class Chondrichthyes.All dogfish specimens are embalmed through caudal artery under pressure. Double-injected dogfish have red latex injected into arterial system and yellow latex injected into the hepatic portal system from the spiral valve to the liver. Triple-injected dogfish in addition to the red and yellow have blue latex injected into the systemic veins. Ideal size for dissection; sexually mature. All Nasco Squalus are degreased for easy handling.Cat/Page: 1167 12 Usage Categories: Preserved Materials Chondrichthyes Chordata - Other Dissection and Science About Nasco In 1941, Nasco got its start by filling a need for teaching aids that were not readily available from any other source. To this day, we are proud to carry on that tradition and serve customers throughout the United States and abroad with the products they need, the quality they expect, and unbeatable customer service, all at prices they appreciate.