Caudafistulus Cadena-Castañeda, 2021

Cadena-Castañeda, Oscar J., Quintana-Arias, Ronald Fernando, Rodríguez, Diana Marcela Trujillo & Páez, Geraldine, 2021, Studies on raspy crickets: Caudafistulus rubrinervosus (Serville, 1838) n. comb (Orthoptera: Gryllacrididae), Zootaxa 5067 (2), pp. 249-258 : 250-252

Caudafistulus Cadena-Castañeda n. gen.

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:516417

Type species. Caudafistulus rubrinervosus ( Serville, 1838) n. comb., here designated.

Taxa included. Caudafistulus rubrinervosus ( Serville, 1838) n. comb. by original monotypy and designation.

Etymology. The name is the combination of the Latin words cauda (tail) and fistula (tube). The name of this genus refers to the shape of the male’s subgenital plate. The gender of the name is being established as neuter.

Description. Medium size (body length 14–16 mm) and robust ( Fig. 1 ). Coloration. The only known species with a predominantly pink body. Head. Space between antennal sockets 1.5 times the wider than the antennal scape ( Figs. 2A, B ); median ocellus conspicuous, occupying much of the space between the antennae, lateral ocelli ovoid, reduced with a diffuse edge ( Fig. 2A ); maxillary palps elongated with the last segment slightly dilated at the apex; labial palpi robust, the last segment noticeably dilated and with rounded apex ( Fig. 2C ). Thorax. Pronotum narrow and smooth, with quadrangular disc and lateral lobes ( Fig. 2B ); humeral notch not developed; auditory spiracle below the lower margin of the lateral lobe of the pronotum and armed with a triangular tubercle, attached on the mesothorax ( Fig. 2C ). Sternum lobes rounded and narrow, without prolongations. Legs. Fore coxa armed with a spine dorsally. Fore and mid femora unarmed; fore and mid tibiae with four spines on each ventral margin and one spine on each side of the ventral-apex ( Fig. 2D ); hind femur robust, ventrally armed; hind tibia armed with spines dorsally only, apex with three spurs on each side, being the mid one the most conspicuous ( Fig. 2E ). Wings. Lanceolate and exceeding the apex of the abdomen and hind femur ( Figs. 1 , 2F ). Abdomen. Stridulatory apparatus absent. Subgenital plate rectangular, with a long posterior border as a tubular shape; styles located on the side edges ( Fig. 2G, H ). Ninth tergite without modification; tenth tergite with two triangular processes, one on each side of the posterior margin ( Fig. 2I ), cerci, and paraprocts without modification or branches ( Fig. 2J ). Phallic complex. Predominantly membranous, with flagellum-like sclerite (TS), and cylindrical plates, sclerosed on each side (AP) ( Fig. 3 ).

Female. Tenth tergite without modification, cerci cylindrical and thin, subgenital plate rectangular without modifications, last abdominal tergite with a fold that occupies the entire posterior border; ovipositor longer than the hind femur, gently curving upward, smooth edges, rounded apex.

Distribution. The Colombian Andes, on the central Andean slope in the Aburra Valley, in the vicinity of the city of Medellín and nearby towns from the eastern high-plateau.

Comparison. Caudafistulus n. gen. differs from the other Brachybaenus species , by its unusual terminalia, none of the other species has the tubular prolongation of the posterior border of the subgenital plate, nor the triangular processes of the posterior border of the tenth tergite. Regarding Brachybaenus longstaffi (Griffini, 1909) (type species of Brachybaenus ), the new genus differs, because it does not have the last abdominal segments prolonged, nor the cerci or paraprocts branching.

Figures

FIGURE 1. Caudafistulus rubrinervosus n. comb. Habitus A. Lateral and B. Dorsal view.

FIGURE 2. Caudafistulus rubrinervosus n. comb. Male. A. Frons. B–C. Head and pronotum in dorsal and lateral view respectively. D. Fore leg. E. Hind leg. F. Tegmina venation. G. Terminalia in ventral view. H. Apex of subgenital plate in axial view. I–J. Terminalia in axial and lateral view respectively.

FIGURE 3. Caudafistulus rubrinervosus n. comb. Male genitalia. A. ventral. B. dorsal. C. lateral views.