Term
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Definition
| Pseudocoelomate; Discovered in 1983 off coast of france; all species are marine (interstital); Bizarre specialized creatures; Corset bearing; Loricera - encases most of the body Lorica covers most of the body |
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Term
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Definition
| Interstital animals - live among sand grains |
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Term
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Definition
| Defining characteristic of Phylum Loricifera - external cutical - molted as juveniles grow (ecdysis) |
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Term
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Definition
| Consists of 4 to 5 parts. Oral Cone, Head, Neck, Thorax, and possibly an abdomen. Head surrounding by large scales. It has a mouth or oral cone and a compelte gut. No apparent circulatory gas exchange organs. One pair of protonephridia which function as kidneys. It is made up of segments. Has an excretory pore, complete digestive system, since no circ or gas must live off of simple diffusion. Scalids (clavoscalids at the top); Plates; |
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Term
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Definition
| Gonochoristic; slight sexual dimorphism; male have a paired testes dorsal; females are slightly larger, have paired ovaries and seminal receptacle. Fertilization is internal. Have parthogenisis. Produce more females without fertilization. Have a larva stage known as higgins larva |
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Term
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Definition
| Larva preadult stage found in Loriciferans. Has swimming appendages and locomotory spines. Discoverd a single specimen in 1974 by Robert Higins. Also known as Larval priapulid |
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Term
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Definition
| Development of an unfertilized egg into an adult |
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Term
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Definition
| Pseudocoelomate; Movable snout; Intriguing animalcules; discovered in 1800s; about 150 species; Nearly all less than 1mm in length; Deposit feeders. Invertebrate stripper. Organic vaccum cleaners. Exclusively marine and interstitital. Intertidal to below 1000m; Clearly Pseudocoelomate; metameric condition makes it a taxonomic controverss - distinct muscle block is similar to arthropods and annelids**. Body cavity and organs are suspended by fluids. |
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Term
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Definition
| Close to shore; where effected by tides; lays exposed to air when tides recede |
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Term
| Phylum Kinorhyncha Body Plan |
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Definition
| Main differences is the cuticular plates; Divided into 13 distinct zonites (segments) Zonite 1: Head, oral cone, stylets, seven spine rings (scalids, Zonite 2: Neck, plates (placids) that fold over head when retracted. Trunk - Tergal and sternal plates, dorsal and lateral spines. 11 Segmeents - 1 tergal plate and 2 sternal on each segment. Mouth is surrounded by oral stylets. |
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Term
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Definition
| Process of removing the sexoskeleten. The new cuticle is secreted before the old one is shed. Kinorhynchs go through 6 molts exactly. When undergoing ecdysis, external cutical needs to shed. Some internal organs need ecdysis so able to grow. Once mature adult, no longer molt. |
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Term
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Definition
| Complete gut with digestive glands. Have regional specialization (oral cone, pharynx, esophagus, mid gut which is similar to intestine)Have CNS epidermal association, anteria ganglien 10 ganglia that are located around pharynx |
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Term
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Definition
| Firm ribbon composied of chitin and proten along which are 2 rows of sharp, chitnous teeth. Produced from radular sac and underlain by suportive cartilage like structure called the odontophore. They make up the buccalmass. Odontiophore extends just beyond the mouth, radular ribbon is moved forward over leading edge and then pulled back |
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Term
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Definition
| Gonochoristic with no sexual dimorphism. Male has 3 cuticular penial spones, female has nutritive and germ cells. Internal fertilization with egg laying. Direct reproduction - starts with miniture adult. Indirect - at least 1 larval stage. |
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Term
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Definition
| Named from greek god of fertility. 15 extant species, 6 fossil. All carnivores; feed on soft bodied animals. Pharynx lined by cuticule; extendes outside body borrows into soft bodied animals. Have been allied with several invertebrate groups. Absence of complete embryological data makes it difficult to class; unable to tell if diplo or triplo. Live in soft sediment. Cylindrical vermiform with bilateral sym. |
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Term
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Definition
3 main structures: Introvert (proboscis; main part and oral cone; spines) 2. Necklike collar
3. Trunk abdomen
4.(optional) tail like caudal appendages that vary in form and function. Hydrostatic skeleton with muscles. Covered in thin flexible cuticle with epidermis underneath. Large hooked spines around mouth. Has tubercules (wart like structures on cuticle). Under epidermis is muscle layers (circular and longitudinal). Segments are superficial. In order to be considered segmeneted would need to be internal. |
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Term
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Definition
| Non cellular hardened layer produced by epidermis. Pripaulids have tubercules on theirs (Wart like structure) |
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Term
| Priapulid Organs (NS?, DT?) |
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Definition
| No circ or resp system. Complete digestive tract. Oral cone, pharyx, esophagus, (polythridium - similar to mastax; plates to grind food), midgut, rectum. Internal transport is done by diffusion. Intraepidermal NS (radial in appearance).. Tactile receptors in caudal appendage. They are gonochoristic, paired gonads free spawners (males first). Millions of gametes but only a few will make it to adult hood. Loricate larvae that looks similar to locifera. They are anoxic. Without o2 will user caudal appendage to increase o2 uptake. |
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Term
| General Molluscan Characteristics |
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Definition
| Mollis - soft bodied. Bilateral symmetry, secondairly asymmetrical. Soft bodied animals; coelomate and triploblastic; Rich fossil record due to the hard calcified shell. Next to arthropods they have the largest and most diverse adaptive body plan. Shell is secreted by mantle. Coelem reduced, have hemocoel for circulation; wahts left of coelem. Area around the heart is the body cavity. Coelem involved with circulation. Heart in pericardial chamber. Thick cuticicular - epidermal mantle. Complete gut. Radula. |
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Term
| Phylum Molluscan General Characteristics |
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Definition
• Thick cuticular –epidermal mantle
• Heart in pericardial chamber
• Radula
• Complete gut
• Microscopic to Giant Octupus
• Soft bodied
• Bilateral symmetry (secondarily assymetrical)
• Coelomate
• Triploblastic
• Rich fossil record
• Next to arthropods – largest and most diverse adaptive body plan
• Shell secreted by mantle |
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