Panarthropoda

Phylum Pananthropoda; Subphylum Onychophora are commonly known as 'Walking Worms' or 'Claw Bearers' due to their unique characteristics.

Phylum Panarthropoda; Subphylum Tardigrada is commonly referred to as Water Bears or Bear Animalcules due to their appearance and nature.

The correct characteristics for animals belonging to Clade Arachnata, Subphylum Chelicerates, and Clade Euchelicerata include having chelicerae as the first pair of ventral appendages, lacking mandibles, and having prosomal and opisthosomal tagmata comparable to the cephalothorax and abdomen of crayfish.

Class Xiphosurida within Clade Arachnata, Subphylum Chelicerates, and Clade Euchelicerata is known for having six pairs of appendages on the abdomen, unique respiratory organs called gill books, being commonly referred to as 'Horseshoe Crab', and having a pair of compound eyes along with two medial eyes.

Clade Arachnata refers to the group of arachnids, which are characterized by having eight legs and chelicerae (fangs). The organisms listed in the correct answer belong to this clade based on their classification in Subphylum Chelicerates, Clade Euchelicerata, and Class Arachnida. Organisms such as beetles, butterflies, and frogs do not fall under the arachnid category.

The correct answer, psuedoscorpionies, refers to a specific order within the class Arachnida characterized by very small scorpions with chelate chelicerae and pedipalps. The incorrect answers are other orders within the class Arachnida, such as Araneae (spiders), Opiliones (harvestmen), and Acari (mites and ticks).

Whip Scorpions, also known as Vinegaroons, belong to the order Uropygi within the class Arachnida. They do not possess poison or a stinging apparatus and have a cephalothorax somewhat narrowly attached to the abdomen.

The correct classification provided refers to True Spiders. While scorpions, ticks, and mites are all arachnids, they belong to different orders within the class Arachnida.

Crustacea are classified under the clade Mandibulates due to their distinct mandibles, which are specialized appendages used for feeding. The other incorrect options refer to different types of appendages found in various arthropods but not specifically in Crustacea.

The correct answer is The Seed Shrimp, which belongs to the Ostracoda class under the Sub Class Maxillopod within the Subphylum Crustacea as part of the Clade Mandibulates.

Class Copepoda, within Sub Class Thoracoracopod of Subphylum Crustacea in Clade Mandibulates, is characterized by the well-developed uniramous first antennae that serve various functions such as swimming, sensory perception, and mating. The other options provided do not accurately represent the defining features of Class Copepoda.

The correct example of Clade Mandibulates in the given taxonomic hierarchy is goose-neck barnacles. They fall under the Subphylum Crustacea, Sub Class Maxillopods, and Class Cirripedia.

The Class Malacostracea in the subphylum Crustacea within the clade Mandibulates holds significance due to their larger size, further utilization of legs for various functions, and being the largest of all arthropods.

The given characteristics like absence of antennae and uniramous antennules, lack of carapace and presence of simple eyes, dorso-ventrally flattened body, and little differentiation between abdomen and thorax describe crustaceans particularly isopods.

The correct answer is 1) Sand Fleas, which have anterior pleopods for swimming and pereiopods for crawling in their classification under Clade Mandibulates, Subphylum Crustacea, Sub Class Thoracoracopod, Class Malacostraca, Suborder Pericarida, Order Amphipodia.

Krill are primarily filter feeders, meaning they feed by filtering small organisms such as plankton from the water.

Crayfish is the correct answer as it falls under the specified taxonomic classification. Lobster, Shrimp, and Crab are also crustaceans but do not fit all the specific criteria listed in the question.

This question is testing knowledge of the classification hierarchy within the Crustacea group. The correct answer 'a.' represents the specific order Decapoda within the Class Malacostraca, which is part of the Subphylum Crustacea in the Mandibulates clade.

The question specifically asks about the external anatomy of a crayfish within the given classification, making 'External anatomy crayfish' the correct answer. The incorrect answers refer to different aspects of other crustaceans, not related to the external anatomy of a crayfish.

The question asks specifically about the internal anatomy of a crayfish belonging to the specified classification. The correct answer focuses on the internal structures of a crayfish, while the incorrect answers mention external morphology of a lobster, respiratory system of a shrimp, and digestive system of a crab, which do not directly relate to the specific inquiry.

The correct answer provides a detailed explanation of the two basic kinds of body organization found among the panarthropods, highlighting the differences between various groups such as Onychophorans, Myriapods, Insects, Crustaceans, and Arachnids.

In insects, the body is divided into three main parts called tagma. These are the prothorax, mesothorax, and metathorax, each serving different functions in the insect's movement and overall structure.

The carapace in decapods is fused with the thoracic segments to form a cephalothorax, which is a distinctive feature of this group of crustaceans.

Chelicera are a pair of pre-oral appendages used for capturing prey or manipulating food, while Mandibles are massive and denticulate, used for tearing, crushing, or grinding food.