Presentation is loading. Please wait.

Presentation is loading. Please wait.

ZOO 115 Invertebrate Zoology

Similar presentations

Presentation on theme: "ZOO 115 Invertebrate Zoology"— Presentation transcript:

1 ZOO 115 Invertebrate Zoology
Subphylum Crustacea

2 Arthropoda – Subphylum Crustacea
~ 42,000 species Major trophic link between primary producers (phytoplankton) and higher level consumers Mostly aquatic Three part brain Two pair of antennae Tactile Chemosensory Many legs Mostly separate sexes Antennae

3 Subphylum Crustacea Shrimps and shrimp-like animals

4 Subphylum Crustacea Lobsters and crawfish

5 Subphylum Crustacea Crabs

6 Class Branchiopoda Order Anostraca
Can tolerate desiccation and high salinity 15-30 mm in length Elongate shrimp-like bodies without a carapace Have stalked compound eyes Most are suspension feeders Swim ventral side up Use their thoracic appendages for capturing food particles Food is passed to a central groove, encased in mucus and moved forward to mouth. Gonochoric Nauplius larvae Fairy shrimp Nauplius larvae Brine Shrimp

7 Class Branchiopoda Order Notostraca
Order Notostraca Triops (tadpole shrimp) Tadpole shrimps None occur in oceans Feed on organic matter in sediments; some are predators or scavengers Characteristic broad shield-like carapace and long caudal rami Triops considered a major pest in rice fields

8 Class Branchiopoda Order Diplostraca
Conchostraca Clam shrimp Clam shrimps and cladocerans Mostly freshwater Scavengers, predators, detritivores, and suspension feeders Well developed clam-like carapace All have a dorsal organ that could function as: Salt gland Neck Gland Adhesion Swim with their powerful second antenna Cladocera Daphnia (water flea)

9 Class Branchiopoda Order Diplostraca
Sexes Hermaphroditism Gonochorism Type of reproduction Monosexual -Parthenogenesis Bisexual reproduction - normal sexual reproduction Eggs Summer - thin-shelled Winter - resting Normal conditions Females make eggs that hatch without fertilization and become females (2N) When environmentally stressed Females produce eggs that hatch into haploid males. Once the males become mature, the Cladocerans can reproduce sexually. Parthenogenesis in Cladocera

10 Cladoceran – reproductive strategies
Population all females Cladocera Daphnia (water flea) Stable conditions Egg Produces Female identical to adult

11 Cladoceran – reproductive strategies
Population all females Cladocera Daphnia (water flea) Unstable conditions Swims to new area Egg Mates with female Produces new females but different genetically from adult Produces Male Produces Female

12 Subphylum Crustacea Class Malacostraca
Abdomen - 6* Telson - 1 Head - 5 Thorax - 8* * Usually Number of segments lobster_dorsal_view.jpg Antenna Maxilliped Mandible Appendages Head - sensory and feeding Thoracic - crawling or grasping Abdominal (unique to this Class and Remipedia) - swimming and copulation Pleopod Telson

13 Class Malacostraca Order Stomatopoda
Stalked compound eye naupliar eye Mantis shrimps Specialized predators No cephalothorax Head, thorax and abdomen Two large stalked compound eyes and a third medial naupliar eye

14 Class Malacostraca Order Stomatopoda
Triramous antennae Specialized prehensile raptorial claws Has abdominal gills like isopods Enormous digestive cecum Very well developed heart and hemal system

15 Class Malacostraca Order Euphausiacea
Krill All pelagic Major source of food for whales, squids and fishes Thoracic gills external to carapace Feeding basket

16 Class Malacostraca Order Decapoda
Stenopodidea Cleaner shrimp Note than third segment is NOT on top of segments 2 and 4 Carid Shrimp Shrimp-like IO Caridea (shrimp) SO Dendrobranciata SF Penaeoidae (prawns) IO Stenopodidea Carid Shrimp Penaeid Shrimp Palinura – note that the first three periopods are NOT chelate Thalassinidea – Ghost shrimp Phyllosoma larve Lobster-like IO Astacidea (lobster) IO Palinura (spiny and slippery lobster) IO Thalassinidea (ghost shrimp) Astacidea - First three periopods chelate

17 Crab-like IO Brachyura (True crabs) IO Anomura Brachyura
Brachyura Crab-like IO Brachyura (True crabs) Anomura – note 5th pleopod is greatly reduced and not readily visible Anomuran Porcelain crab zoea Note that the fifth pleopod is easily visible IO Anomura Anomura – hermit crab

18 Class Malacostraca Order Decapoda
Feeding 6 pair of feeding appendages 1 pr Mandibles 2 pr Maxillae 3 pr Maxillipeds Most predators and/or scavengers, some suspension feeders, some detritivores, some herbivores, some onmivores

19 Class Malacostraca Order Decapoda
Internal anatomy Up to 24 pair of gills

20 Class Malacostraca Order Decapoda
Sense organs Legs Antennae 1st Stalked compound eye

21 Class Malacostraca Order Decapoda
Chromatophores Shrimps especially good at changing color

22 Class Malacostraca Order Decapoda
Reproduction Most separate sexes (gonochoric) Sperm transfer – indirect (spermatophores) Many have copulation Bachyurans may block fertilization for up to a year following copulation

23 Class Malacostraca Order Decapoda
Lobster Life cycle Planktonic larvae of the spiny lobster Phyllosoma larvae

24 Class Malacostraca Order Decapoda
Crab Life cycle

25 Class Malacostraca Order Mysida
Mysid shrimps Most 2-30 mm Gnathophausia - 35 cm Omnivorous suspension feeders Well developed carapace and tail fan

26 Class Malacostraca Order Isopoda
Isopods, pill bugs ~10,000 sp 0.5 – 50 cm Virtually all habitats Flattened dorso-ventrally

27 Class Malacostraca Order Amphipoda
Amphipods ~8000 sp. 1mm-25 cm In almost every habitat Flattened laterally Carapace absent Gills thoracic Lives in a Salp Hyperiidea amphipod Caprellid amphipod Gammarid Amphipods

Download ppt "ZOO 115 Invertebrate Zoology"

Similar presentations

Ads by Google