#annelidan

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[banyanas]

i recalled earlier a comment Lemon left and i think it would be genuinely funny in a way to have a ‘at least one word you probably need to look up’ thing per longfic.

Like not because of some weird pretentious thing i just really like weird words

#is ‘annelidan’ the most common word to describe a particularly segmented part of a Creature? no #but it IS the most fun one for me and i’m here to Have Fun #bañana post

[i-should-have-studied]

Type Study: Peripatus

Peripatus is a terrestrial animal, living in moist places like under stones, logs, and other damp and dark places where it is protected from water loss and predatory arthropods. It is nocturnal, predaceous, and a carnivore.

Body is elongated, cylindrical, and bilaterally symmetrical, measuring between 5-7cm in length. External segmentation is unclear. Its legs are unjointed, each is a stumpy protuberance ending in two claws and provided with 3-6 pads on ventral side which serve as walking soles. Body is actually lifted off the ground by the legs which move in a series of steps, hence the common name walking worm. Skin covered with a thin soft cuticle and has transverse ridges bearing papillae or tubercles armed with chitinous spines. Below the cuticle are layers of muscles and connective tissue. Peripatus shows sexual dimorphism, females are larger than males.

Peripatus has no economical importance, but is interesting zoologically because it exhibits both annelid and arthropod characteristics along with it's own.

Annelidan:

No true head

Dermo-muscular body wall with a think flexible cuticle and muscles under

Slow locomotion

Simple eyes

Unjointed, hollow stumpy legs

Simple and straight alimentary canal with terminal mouth and anus.

Segmentally arranged nephridia

Presence of cilia in the excretory and reproductive ducts.

Arthropodian:

Presence of antenne

Modified jaws with striped muscles.

Locomotion by legs

Cuticle has thin deposit of chitin

Body-cavity is haemocoel

Dorsal tubular heart with lateral ostia

Presence of tracheal respiratory system

General structure of reproductive organs

Onychophoran:

Lack of external segmentation

Texture of skin

Antennae not homologous to the antennae of arthropods

Single pair of jaws

Three-segmented head

Non-jointed legs with claws

Two ventral nerve cords widely separated and don't have true ganglia

Eye structure is not very complicated

Distribution of reproductive organs.

Molluscan: Once was considered a mollusc due to it's slug like appearance.

[i-should-have-studied]

General Characteristics of Arthrapod

Organ-system level of body of organization

Bilaterally symmetrical, triploblastic, metamerically segmented

Jointed appendages with varied functions like jaws, gills, legs, etc.

Exoskeleton of dead chitinous cuticle that is shed at internals called moulting. Shed for growth and development.

Body divisible into head, thorax, and abdomen. Sometimes head and thorax fuse to form a cephalothorax.

True coelom is reduced and mostly replaced with a blood-filled haemocoel.

Striated muscles capable of rapid contraction.

Digestive system complete with mouth and anus. Mouth parts vary for different modes of feeding.

Open circulatory system with a dorsal chambered heart, blood, arteries and haemocoel.

Respiration by general body surface, gills, trachae, or book-lungs.

Excretory organs are green glands.

Annelidan nervous system with a dorsal brain connected with a nerve ring to a double ventral nerve cord.

Sensory organs include eyes (simple and compound), chemo- and tactile receptors, balancing and auditory organs.

Sexes usually separate (dioecious). Reproductive organs and ducts are paired. Internal fertilization. Oviparous or ovoviviparous.

Direct or indirect development with many larval stages. Parthenogenesis in some.

Cilia and flagella absent.

Parental care often well-marked.