Presentation on theme: "Lecture 17: Phylum Arthropoda, Part 2 Focus: Marine Crustacea"— Presentation transcript:
1 Lecture 17: Phylum Arthropoda, Part 2 Focus: Marine Crustacea Invertebrate ZoologyLecture 17: Phylum Arthropoda, Part 2Subphylum CrustaceaFocus: Marine Crustacea
2 Lecture outlineSubphylum CrustaceaOverviewSelected groups
3 Key Crustacean features Two pairs of antennae; 3 pairs of mouthparts (mandibles, 2 prs maxillae)Compound eyes, sometimes on stalksBody regions:Head and thorax often "cephalothorax“AbdomenBiramous appendages: thoracic & abdominalCalcium carbonate in cuticleMany have gills
4 Crustacea diversity: overview Differences in tagmatizationDifferences in appendage structure & functionIs the Class Remepedia truly “primitive?”
5 Class Malacostraca (Subclass Eumalacostraca) Five-segmented headEight-segmented thoraxSix-segmented abdomen“Tail” = telson + uropodsCarapace: partly/completely covers head & thorax
6 Class Malacostraca Thoracic appendages = thoracopods MaxillopedChelipedPereopodAbdominal appendagesPleopod
27 Class Malacostraca Order Amphipoda Laterally compressedCephalon: head plus first thoracic segmentNon-stalked eyes; compoundThoracic brood pouchBeachhopper appendagesGnathopodsSome modified for jumpingPleopodsMovement; respiration
29 Class Malacostraca Order Isopoda Idotea sp.Ligiapallasii
30 Class Malacostraca Order Isopoda Dorso-ventrally compressedCephalon: head plus first thoracic segmentNon-stalked eyes; compoundAntennae 2 longPereon = rest of thoraxSeven pairs of similar legsAbdomen: pleopods for swimming, respiration
31 Class Maxillopoda Infraclass Cirripedia: barnacles Carapace covered by calcareous platesFour valvesHeadNo antennae after settling3 pairs of mouthpartsThoraxSix pairs of biramous appendages (cirri)Long penisNo abdomenFeeding
32 Order Cirripedia: the barnacles Balanus, Semibalanus sp.Pollicipes polymerusChthamalus sp.
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