Phylum Pananthropoda; Subphylum Onychophora |
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"Walking
Worms" or "Claw Bearers".
Their body is
cylindrical and externally and internally unsegmented, although the nervous and
nephridial excretory systems show
internal segmental arrangement |
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Phylum Pananthropoda; Subphylum Tardigrada |
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"Water
Bears" or "Bear Animalcules"
Can enter tun state: the
metabolic activities of the organisms are reduced to what seems an impossible
level to regulate water los
stylet: on mouth in which plant tissues are pierced and juices are sucked in |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata |
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1)have the first pair
of ventral appendages modified terminally to form opposing claw-like or
pincer-like organs termed chelicerae 2)Lack mandible 3)
prosomal and opisthosomal tagmata are comparable to what is termed the cehpalothorax and abdomen of the
crayfish |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Xiphosurida |
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1)six pairs of
appendages on the abdomen in addition to the six in what is known as the prosomal region 2)
respiratory organs
are named gill books 3)
"Horseshoe
Crab" 4)
A pair of compound eyes and two medially eyes |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Arachnida |
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Scorpions,
Pseudoscorpions, Whip Scorpions, Spiders, Soldier Spiders, Harvestmen, Mites,
Ticks, |
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Phylum Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Arachnida; Order Scorpionies |
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1)An elongate central
trunk (prosoma), enlarged chelate
pedipalps, and the segmented tail (opisthosoma)
with its terminal "stinger"
are the cardinal characteristics for this group 2)
prosoma bears the chelicera, pedipalps, and four pairs of walking legs 3)Pectines: 9th segment only found in scorpions/ comb-like used for sensory 4)Telson- gland located on basal bulb that injects toxin |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Arachnida; order
psuedoscorpionies |
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Very small scorpions Note chelate chelicerae and pedipalps |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Arachnida; order Uropygi |
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1)Whip Scorpions 2) Known as
Vinegaroons due to the secretions of a defensive or offensive substance from glands
in the posterior part of the body with an acetic acid odor like that of vinegar 3)
no poison or stinging
apparatus and cephalothorax is
somewhat narrowly attached to the abdomen |
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Clade Arachnata; Subphylum Chelicerates; Clade Euchelicerata; Class Arachnida; Order Araneae |
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1) True Spiders 2)
prosoma is usually the smaller of the two parts, both of which are unsegmented
in the adult. 3)
The opisthosoma contains the main
respiratory, excretory (Malphigian
tubules), reproductive, digestive organs,heart, and silk spinning organs 4)
The main nerve center
is in the prosoma 5)
The massive two
jointed opposing chelicerae are
distinctive |
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Clade Mandibulates; Subphylum Crustacea |
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the Crustacea are
characterized by a pair of appendages, the "mandibles" |
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Clade Mandibulates; Subphylum Crustacea; Sub Class Maxillopods; Class Branchura |
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1)
a parasitic existence
on gills of fresh water and marine fishes 2)
The labrium and labium
have formed a cone,
used for piercing their host and sucking their food. |
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Clade Mandibulates; Subphylum Crustacea; Sub Class Thoracoracopod; Class phylopoda; Phyla Brachiopoda |
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1)
largely freshwater
inhabitants 2)
The coxa of the thoracic appendages has a
flattened epipodite, which is used
as a gill 3)Cladocera(water fleas) |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod; Class Anostraca |
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1) Fairly shrimp 2)
adapted to high
salinity and found in large bodies of often temporary salt water |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Maxillopod; Ostracoda |
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1)The Seed Shrimp |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod; Class Copepoda |
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uniramous first antennae are well developed and serve a range of
functions in the group-swimming, sensory and mating |
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Clade Mandibulates; Subphylum Crustacea; Sub Class Maxillopods; Class Cirripedia |
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1)
goose-neck barnacles 2)
noting the terga and scuta (plates closing shell).
|
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod; Class Malacostracea |
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The malacostracans
carry this basic arthropod evolutionary theme further by using the legs for
even more functions and, all of this, being packaged in a larger size. The
largest of all arthropods |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
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1)
periopods - the first five are subchelate in structure and aid in feeding rather
than locomotion 2)
males possess two chitinous penes, |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; Suborder Pericarida |
|
1) Crustaceans 2)
The antennae are
absent and the antennules are uniramous (vestigal) in terrestrial forms.
Isopods lack a carapace, have simple eyes (ocelli),
are dorso-ventrally flattened, and the abdomen is little differentiated from
the thorax 3) omnivores or herbivores |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; Suborder Pericarida; order Amphipodia |
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1)
The Sand Fleas 2)
anterior pleopods: used for swimming 3)pereiopods: used for crawling |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; order
Euphausiacea |
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1) filter feeders 2) Krill |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; Order Decapoda |
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Crayfish |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; Order Decapoda (Dissection) |
|
a |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malacostraca; Order DecapodaExternal Anatomy |
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external anatomy crayfish |
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Class Malacostraca; Order DecapodaInternal Anatomy |
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Internal Anatomy crayfish |
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Two basic kinds of body
organization are found among the panarthropods |
|
1)
in the Onychophorans,
Myriapods, Insects and Crustaceans the body is divided into an anterior tagma,
the head, which consists of fused
anterior segments, and the remainder of the body is the trunk. 2)
In the Arachnids the most anterior tagma is the prosoma, which also consists of fused
anterior segments. Although the prosoma is functionally comparable to the
crustacean cephalothorax, the two
body regions are not homologous because different segments make them up. The
hind part of the arachnid is called the opisthosoma
and is again functionally analogous but not homologous to the abdomen of other arthropods. |
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insects it is divided
into three tagma |
|
the prothorax, mesothorax, and metathorax. |
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carapace |
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1)
fused with the
thoracic segments to form a cephalothorax as in the decapods 2)
carapace is generally
a diagnostic feature of the Crustacea, it is absent in copepods, isopods,
amphipods, and anostracans |
| |
two major types of
mouthparts in the arthropods |
|
Chelicera are a pair
of pre-oral appendages that are either chelate
(ie. horseshoe crabs) or sub-chelate
(i.e. spiders) and generally used for the capture of prey and/or the
manipulation of food prior to entering the mouth
Mandibles: are massive and
denticulate (bearing teeth) and used for tearing, crushing or grinding of food.
|
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Pedipalps |
|
1)are the second air of
appendages on the prosoma of chelicerates. 2)They may be massive and chelate as
in the scorpions or very leg-like as in the spiders. 3)
used in both prey
capture and manipulation and preparation of food for ingestion. They are also
sensory in function |
| |
Antennae |
|
anterior appendages
on the head of mandibulates. There may be one or two pairs of antennae and the
number is diagnostic as only crustaceans have two pair. Antennae are entirely
sensory in function and usually multi-segmented or flagellar (whip-like) in structure |
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Arachnida two distinct body divisions |
|
1)
opisthosoma: lacks appendages 2)
prosoma (central trunk) possesses six pairs (4pairs of walking legs, a pair
of pedipalps or palps, and a pair of
chelicerae), all of which become
variously modified in the several orders of the class. |
| |
What appendages on crustaceans are analogous to pedipalps of Chelicerates? |
|
first and second
maxillae of the head located just posterior to the mandibles and extending
forward to cover them, and up to the first three pairs of thoracic appendages,
the maxillipeds |
| |
diagnostic characters
of the Crustace/ mandibilates |
|
three tagma, the
head, thorax, and abdomen, and one or two pairs of antennae. |
| |
diagnostic characters
of the chelicerates |
|
two tagma; prosoma and opisthosoma and no antennae |
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the appendages of an
adult crayfish may be classified as: |
|
(1) foliaceous,
characterized by the 2nd maxillae, (2) biramous
as indicated by the swimmerets (pleopods)
(3) uniramous, an example of which is the walking leg. |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; Order Decopoda; palinuria |
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spiny lobster |
| |
Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; Order Decopoda; Branchyura |
|
king crab |
| |
Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; Order Decopoda; Anomura |
|
hermit crab |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; Order Decopoda; Sub order Pericaridia; Order Isopoda |
|
sand crab |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; Order Decopoda;Carida |
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shrimp |
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Clade Mandibulates; Subphylum Crustacea; Sub Class
Thoracoracopod;Class Malocostraca; stomatopoda |
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manta shimp(big shrimp) |
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