Question: Tettigoniidae belongs to which phylum?

Context paragraphs:
Porphyra: Porphyra is a coldwater seaweed that grows in cold, shallow seawater.  More specifically, it belongs to red algae phylum of laver species, comprising approximately 70 species.  It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans.  In East Asia, it is used to produce the sea vegetable products "nori" (in Japan) and "gim" (in Korea).  There are considered to be 60 to 70 species of "Porphyra" worldwide and seven in the British Isles.

Ruspolia lineosa: Ruspolia lineosa is an insect which belongs to the Tettigoniidae (Katydids) family.  The scientific name of this species was first published by Walker in 1869

Microcotyle: Microcotyle is a genus which belongs to the phylum Platyhelminthes and class Monogenea.  Species of "Microcotyle" are ectoparasites that affect their host by attaching themselves as larvae on the gills of the fish and grow into adult stage.  This larval stage is called oncomiracidium, and is characterized as free swimming and ciliated.

Theileria: Theileria is a genus of parasites that belongs to the phylum Apicomplexa and is closely related to "Plasmodium".  Two "Theileria" species, "T. annulata" and "T. parva", are important cattle parasites.  "T. annulata" causes tropical theileriosis and "T. parva" causes East Coast fever.  "Theileria" are transmitted by ticks.

Insect: Insects or Insecta (from Latin "insectum ", a calque of Greek ἔντομον ["éntomon "], "cut into sections") are by far the largest group of hexapod invertebrates within the arthropod phylum.  Definitions and circumscriptions vary; in one approach insects comprise a class within the Phylum Arthropoda.  As the term is used here, it is synonymous with Ectognatha.

Tettigoniidae: Insects in the family Tettigoniidae are commonly called bush crickets (in the UK), katydids (in the USA), or long-horned grasshoppers (mostly obsolete).  More than 6,400 species are known.  Part of the suborder Ensifera, Tettigoniidae is the only family in the superfamily Tettigonioidea.

Porphyromonas gingivalis: Porphyromonas gingivalis belongs to the phylum Bacteroidetes and is a nonmotile, Gram-negative, rod-shaped, anaerobic, pathogenic bacterium.  It forms black colonies on blood agar.

Sarcomastigophora: The phylum sarcomastigophora belongs to the Protista or protoctista kingdom and it includes many unicellular or colonial, autotrophic, or heterotrophic organisms.

Choanozoa: Choanozoa (Greek: "χόανος (choanos)" = "funnel" + "ζῶον (zōon)" = "animal") is the name of a phylum of eukaryotes that belongs to the line of opisthokonts.  The Animals appear to have emerged in the Choanozoa, as sister clade of the Choanoflagellates. Also the Fungi and Opisthosporidia appear to have emerged in the Choanozoa, as a sister clade of the Cristidiscoidea.  With these included, Choanozoa becomes synonymous with Opisthokonta. .

Actinoposthia beklemischevi: Actinoposthia beklemischevi is an acoel flatworm that belongs to the Actinoposthiidae family.  It forms part of the Acoelomorpha subphylum, which is part of the Xenacoelomorpha phylum that is in the Animalia kingdom.

Supporting paragraphs: Tettigoniidae Insect
Answer: arthropod phylum