Chapter 7 Planktonic Crustacea Part VI Euphausiacea Department of Oceanography
Chapter 7 Planktonic Crustacea Part VI Euphausiacea Department of Oceanography
References Baker A de C, Boden B P, Brinton E, 1990. A practical guide to the euphausiids of the world. 96p Mauchline J, Fisher L R, 1969. The biology of euphausiids. Advances in Marine Biology, 7, 454p Mauchline J, 1980. The biology of mysids and euphausiids. Advances in Marine Biology, 18, 681p
References Baker A de C, Boden B P, Brinton E, 1990. A practical guide to the euphausiids of the world. 96p Mauchline J, Fisher L R, 1969. The biology of euphausiids. Advances in Marine Biology, 7, 454p Mauchline J, 1980. The biology of mysids and euphausiids. Advances in Marine Biology, 18, 681p
Features – a complete carapace covering the entire cephalothorax – complete similarity of all biramous thoracic limbs – podobranchia – Photophores – Indirectly development
Features – a complete carapace covering the entire cephalothorax – complete similarity of all biramous thoracic limbs – podobranchia – Photophores – Indirectly development
1 General morphology 1.1 External features cephalothorax abdomen rostrum cervical groove Lateral denticles dorsal spine dorsal keel preanal spine
1 General morphology 1.1 External features cephalothorax abdomen rostrum cervical groove Lateral denticles dorsal spine dorsal keel preanal spine
Appendages A 1 A 2 M；M 1；M 2 P1-8 Pl1-5 Up
Appendages A 1 A 2 M；M 1；M 2 P1-8 Pl1-5 Up
1.2 Internal morphology 1.2.1 Digestive system: mouth – esophagus – stomach – midgut – hindgut - anus 1.2.2 Circulation 1.2.3 Respiration system: podobrachiae 1.2.4 Excretory system: antennal glands 1.2.5 Reproductive system: ♀♂dioecious 1.2.6 Nervous system and sensory organ：compound eyes 1.2.7 Photophores
1.2 Internal morphology 1.2.1 Digestive system: mouth – esophagus – stomach – midgut – hindgut - anus 1.2.2 Circulation 1.2.3 Respiration system: podobrachiae 1.2.4 Excretory system: antennal glands 1.2.5 Reproductive system: ♀♂dioecious 1.2.6 Nervous system and sensory organ：compound eyes 1.2.7 Photophores
2 Classification Crustacea Malacostraca Eucarida Euphausiacea (2 families, 11 genera, 87 species) Family Bentheuphausiidae Family Euphausiidae
2 Classification Crustacea Malacostraca Eucarida Euphausiacea (2 families, 11 genera, 87 species) Family Bentheuphausiidae Family Euphausiidae
Order Euphausiacea 1a Photophores present only on abdominal segment one .Stylocheiron 手磷虾属 1b Photophores present on abdominal segments one to four .2 1c No photophores on abdomen or thorax . 3 1b 1a 1c
Order Euphausiacea 1a Photophores present only on abdominal segment one .Stylocheiron 手磷虾属 1b Photophores present on abdominal segments one to four .2 1c No photophores on abdomen or thorax . 3 1b 1a 1c
2a Eyes round, thoracic legs of approximately the same length .3 2b Eyes in two parts with a constriction between the lobes, one or two pair of thoracic legs very elongated .8 2a 2b
2a Eyes round, thoracic legs of approximately the same length .3 2b Eyes in two parts with a constriction between the lobes, one or two pair of thoracic legs very elongated .8 2a 2b
3a A full complement of eight thoracic legs .Bentheuphausia amblyops 3b Eight thoracic leg extremely minute. Seventh thoracic leg smaller than sixth but the same shape and with the number of segments (six) .Thysanopoda 樱磷虾 3c Eight thoracic leg extremely minute and seventh thoracic leg with only two segments or reduced to a very small process .4 3b 3c 3c
3a A full complement of eight thoracic legs .Bentheuphausia amblyops 3b Eight thoracic leg extremely minute. Seventh thoracic leg smaller than sixth but the same shape and with the number of segments (six) .Thysanopoda 樱磷虾 3c Eight thoracic leg extremely minute and seventh thoracic leg with only two segments or reduced to a very small process .4 3b 3c 3c