taxonID	type	description	language	source
03916369EE5E0253FC92FF55D2D6DDE3.taxon	discussion	Remarks. Arethaea is a very distinctive genus and unique among North American katydids in having extremely long and slender legs and very narrow tegmina in males (Hebard, 1936; Capinera et al., 2004). No other North American Phaneropterinae possess such thin and elongate appendages, making them unmistakable and giving rise to their common name, “ thread-legged katydids. ” Sixteen extant species of Arethaea are known, all of which occur in the southernmost United States and in Mexico, namely: A. ambulator Hebard; A. arachnopyga Rehn & Hebard; A. brevicauda (Scudder); A. carita Scudder; A. constricta Brunner von Wattenwyl [treated as two subspecies: A. c. constricta and A. c. comanche Hebard]; A. coyotero Hebard; the type species A. gracilipes (Thomas) [treated as three subspecies: A. g. cerciata Hebard, A. g. gracilipes (Thomas), and A. g. papago Hebard]; A. grallator (Scudder); A. insaroides Rehn & Hebard; A. limifera Rehn & Hebard; A. mescalero Hebard; A. phalangium (Scudder); A. phantasma Rehn & Hebard; A. polingi Hebard; A. sellata Rehn; and A. semialata Rehn & Hebard.	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	description	(Figs 2, 3)	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	materials_examined	Holotype. INHS-P 2190 - 1: Adult male preserved in right lateral aspect on a roughly square slab of shale measuring 95 × 98 × 6 mm. Several other insects are present on the slab including: fragmentary hymenopteran wings [INHSP 2190 - 2], a ground beetle (Coleoptera: Carabidae) [INHSP 2190 - 3], two froghoppers (Hemiptera: Cercopoidea) [INHS-P 2190 - 6 and INHS-P 2190 - 7], and two very fragmentary indeterminate insects [INHS-P 2190 - 4 and INHS-P 2190 - 5].	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	etymology	Etymology. The specific epithet honours our dear friend and colleague Dr Leellen Solter, whose hard work and dedication, both in the field and lab, have vastly improved the INHS Fossil Insect Collection.	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	diagnosis	Diagnosis. The new species is separated from congeners by the following combination of characters: [1] pronotal disc almost completely flat with no apparent elevation or elaboration of the metazona; [2] principal sulcus of pronotum weakly developed; [3] metafemur. approx. seven times longer than pronotum and approx. 70 % as long as metatibiae; [4] first abdominal tergite without prominent glandular process.	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	materials_examined	Type locality and horizon. USA: Colorado: Rio Blanco County: approximately 35 km south of Meeker on County Road 5: 39.7291, - 107.9768. Green River Formation: Parachute Creek Member (Eocene: Ypresian — Lutetian).	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	description	Description. Body form cryptic, typical of the genus. Head elongate, with fastigium verticis and frons produced somewhat anteriorly; antennae incomplete, very long and slender; eye faintly preserved but apparently elongate and elliptic in form; mouthparts well-sclerotised, elongate. Thorax with “ hump-like ” form typical of the genus; pronotum sellate, disc almost completely flat, metazona not elevated, lateral margin broadly rounded with distinct marginal carina; meso- and metathoraces with welldeveloped flight muscles visible. Tegmina long, narrow, missing apices, at least twice as long as abdomen, venation indistinctly preserved. Legs extremely long and slender, typical of the genus; proleg incompletely preserved, with profemur at least one-third longer than pronotum, and protibia bearing tiny spines; mesoleg not preserved; metafemur extremely slender, approx. seven times as long as pronotum; metatibia extremely slender, approx. threetenths longer than metafemur, bearing two rows of small, well-sclerotised dorsal spines along entire length; 1 st and 2 nd metatarsomeres of equal length; 3 rd metatarsomere slightly shorter, with pad projecting somewhat distally; 4 th metarsomere at least twice as long as 3 rd, gently curved, with prominent tarsal claws. Abdomen approx. half as long as tegmina; 1 st tergite simple, lacking prominent tooth-like glandular process; entire abdomen preserved in sagittal section with internal soft tissues exceptionally preserved; anterior midgut (ventriculus) coiled, preserved as dark organic compression; at least five distinct tubulelike structures present in posterior half of abdominal cavity associated with a small but distinct ovoid structure closely resemble accessory glands and testis, with other undifferentiated soft tissues resembling fat body. Measurements. Total body length approx. 18.0 mm; head 2.9 mm long (measured from vertex to apex of mouthparts); pronotum 2.5 mm long; tegmina at least 21.6 mm (apical part not preserved); profemur at least 7.4 mm long (not completely preserved); metafemur approx. 19.0 mm long; metatibia 27.1 mm; metabasitarsus approx. 0.6 mm long; 2 nd metatarsomere approx. 0.6 mm long; 3 rd metatarsomere approx. 0.4 mm; 4 th metatarsomere approx. 0.8 mm long; abdomen 11.4 mm long.	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
03916369EE5E0257FC92FB1DD34EDB22.taxon	discussion	Remarks. The assignment of A. solterae sp. nov. to Arethaea is strongly supported by its extremely long and slender legs (profemur approximately 2.5 × the length of the pronotum and metafemur at least twice as long as the abdomen), very narrow tegmina (in males at least more than 8 × longer than wide), and eyes markedly elongate and elliptic (see Hebard, 1936; Capinera et al., 2004). Detailed comparison of A. solterae sp. nov. with extant species of the genus is limited by the preservation of the specimen. While exceptionally well-preserved, the holotype of A. solterae sp. nov. being preserved as an organic compression in right lateral aspect (Fig. 2 A) makes assessment of the posterior margin of the pronotum (a character used to separate extant species) impossible. Moreover, the cerci, which are also an important character used to delimit extant species, are not preserved in A. solterae sp. nov. The form of the apices of the pro- and mesofemora was noted as being particularly useful in separating species by Hebard (1936), though are also insufficiently preserved in A. solterae sp. nov. to be informative. Nevertheless, it is clear that the first abdominal tergite in A. solterae sp. nov. does not bear the prominent, somewhat tooth-like glandular process typical of many species of the genus. In this respect, A. solterae sp. nov. most closely resembles A. sellata, with which it also shares similar relative proportions (see Rehn, 1907), but differs in being slightly larger and with the dorsal surface of the pronotum being generally flat, without any notable elevation of the metazona. While the latter character state may be plesiomorphic, it is a feature known only in A. solterae sp. nov., readily separating it from all extant species of the genus.	en	HEADS, SAM W., THOMAS, M. JARED, HEDLUND, TYLER J., WANG, YINAN (2023): A new fossil katydid of the genus Arethaea Stål (Orthoptera: Tettigoniidae) with exceptionally preserved internal organs from the Eocene Green River Formation of Colorado. Palaeoentomology 6 (3): 268-277, DOI: 10.11646/palaeoentomology.6.3.10, URL: http://dx.doi.org/10.11646/palaeoentomology.6.3.10
