Carinadelius Ranjith & van Achterberg, 2021

Ranjith, A. P., Achterberg, C. Van, Samartsev, K. G. & Nasser, M., 2021, Discovery of the chelonine tribeAdeliini Viereck, 1918 (Hymenoptera: Braconidae) from the Indian subcontinent with the description of a new genus from south India, Zootaxa 4926 (1), pp. 1-25 : 4-6

Carinadelius Ranjith & van Achterberg gen. nov.

Figs 1–2

urn:lsid:zoobank.org:act:6A7F6D98-D1D5-40D6-AFBE-0E3D788FD5CD

Type species: Carinadelius medicus Ranjith & van Achterberg sp. nov.

Description. Female.

Head. Antenna with 21 antennomeres ( Fig. 2A ). Scape without modifications, longer than wide ( Fig. 2A ). Pedicel short ( Fig. 2A ). Terminal antennomere blunt ( Fig. 2A ). Antennomeres 3–8 longer than wide, rest as long as wide ( Fig. 2A ). Head slightly transverse in anterior view ( Fig. 1B ). Eyes long setose ( Figs 1B & C ). Labrum concealed by clypeus ( Fig. 1B ). Malar suture present ( Fig. 1B ). Head wider than long in dorsal view ( Fig. 1C ). Ocelli small, arranged in equilateral triangle ( Fig. 1C ). Frons slightly concave medially ( Fig. 1C ). Occipital carina complete dorsally ( Fig. 1C ), absent ventrally, not connected with hypostomal carina ( Figs 1A & E ). Vertex faintly crenulate medially near occipital carina ( Fig. 1C ). Mandible curved ( Fig. 1B ). Face weakly convex in lateral view ( Fig. 1E ). Tentorial pit rather small ( Fig. 1B ). Palps short. Maxillary palp 5-segmented. Labial palp 3-segmented ( Fig. 1E ).

Mesosoma. Mesosoma dorso-ventrally flattened ( Fig. 1E ). Propleuron crenulate posteriorly and laterally ( Fig. 1E ). Propleural lobe present ( Fig. 1E ). Mesoscutum smooth, setose, with indistinct lateral carina and distinct posterior transverse carina ( Fig. 1D ). Notauli absent ( Fig. 1D ). Scutellar sulcus arch-shaped, crenulated ( Fig. 1D ). Scutellum smooth, sparsely setose ( Fig. 1D ). Lateral sides of scutellum distinctly crenulate ( Fig. 1D ). Metanotum smooth ( Fig. 1D ). Mesopleuron smooth ( Fig. 1E ). Precoxal sulcus long, smooth sometimes weakly crenulate ( Fig. 1E ). Metapleuron smooth with distinct medial pit ( Fig. 1E ). Propodeum with distinctly marginated smooth areas ( Fig. 1F ). Propodeum slightly curved in lateral view, not differentiated into anterior and posterior part ( Figs 1E & F ). Posterior side of propodeum with distinct midlongitudinal carina and vertical lateral carina ( Fig. 1F ). Medial transverse carina interrupted by areola ( Fig. 1F ). Propodeal areola pentagonal, slightly sculptured anteriorly ( Fig. 1F ). Propodeal spiracles round ( Fig. 1F ).

Wings. Fore wing: fore wing infuscated below pterostigma and near vein cu-a ( Fig. 2C ). Pterostigma wide ( Fig. 2C ). Vein 1SR+M connected with vein 1-M ( Fig. 2C ). Vein M+CU distinctly curved ( Fig. 2C ). Vein cu-a postfurcal ( Fig. 2C ). Vein r absent ( Fig. 2C ). Vein r-m absent ( Fig. 2C ). Vein m-cu postfurcal ( Fig. 2C ). Veins 2-SR and SR1 connected with pterostigma ( Fig. 2C ). Vein 1-R1 long ( Fig. 2C ). Veins 2-1A and CU1b absent ( Fig. 2C ). Subdiscal cell open ( Fig. 2C ). Hind wing: hind wing with 3 hamuli. Basal cell narrow. Vein M+CU longer than 1-M. Vein 1-1A absent.

Legs. Middle coxa with dorsal transverse groove ( Fig. 1E ). Hind coxa smooth ( Fig. 1E ). Hind femur and tibia distinctly flattened ( Fig. 1A ). Hind tibial spurs long. Hind basitarsus long. Tarsal claw simple.

Metasoma. Metasoma smooth, 6-segmented ( Fig. 2B ). Tergites 1–3 immovably joined ( Fig. 2B ). First tergite distinctly notched antero-medially ( Fig. 2B ). First and second metasomal suture absent ( Fig. 2B ). Ovipositor sheath exerted, setose apically. Ovipositor without dorsal nodus and ventral serrations.

Etymology. Name formed by combining the generic name Adelius and ‘carina’, because of the midlongitudinal carina on the propodeum and the incomplete occipital carina. Gender: masculine.

Distribution. Oriental region ( India).

Comparative diagnosis. The ventrally reduced occipital carina and the midlongitudinal carina and vertical lateral carina posteriorly of the propodeum are considered to be apomorphic characters of the new genus. In addition, the new genus exhibits another peculiar character, its propodeum is not divided into anterior and posterior parts by means of a complete transverse carina which separates it from other genera. This carina may be reduced in Adelius . These characters combined separate Carinadelius from other genera within the tribe. In the keys provided by Belokobylskij (1988, 1998), He & Chen (2000), Shimbori et al. (2019) Carinadelius comes close to Adelius because of the smooth metasoma and evenly fused metasomal tergites 1–3. The combination of the smooth metasoma and absence of first and second metasomal sutures places this genus within the group containing Adelius and Myriola . The smooth marginated areas on the propodeum found in Carinadelius are different from those in Adelius + Myriola . Apart from the apomorphic characters Carinadelius exhibits some other interesting characters like absence of fore wing vein r and position of vein cu-a. Carinadelius differs from Adelius in having the unique carination of the propodeum (propodeum without midlongitudinal carina posteriorly in Adelius ), ventrally absent occipital carina which is not connected with hypostomal carina (occipital carina complete, connected with hypostomal carina in Adelius ), fore wing vein M+CU distinctly curved (more or less straight in Adelius ), vein r absent (present or absent in Adelius ).

Carinadelius is also similar to Myriola in having an undivided propodeum. However, it differs from Myriola in having the following characters: fore wing vein 1-R1 present and long (vein 1-R1 absent in Myriola ), malar space distinctly longer than basal width of mandible (distinctly shorter than basal width of mandible in Myriola ), fore wing vein r absent (present in Myriola ), fore wing infuscated (hyaline in Myriola ). The smooth metasoma in Carinadelius separates it from the genera Paradelius , Sculptomyriola and Sinadelius in which metasomal tergites 1–3 are sculptured. Even though other adeliine genera exhibit a fixed number of antennomeres (22 in Sinadelius and 20–21 in other genera), it is found that number of antennomeres is highly variable at least in the genus Adelius (E.M. Shimbori, personal communication).

Figures

FIGURE 1. Carinadelius medicus Ranjith & van Achterberg gen. et sp. nov., holotype, female A) Habitus, lateral view, B) Head, anterior view, C) Head, dorsal view, D) Mesosoma, dorsal view, E) Head and mesosoma, lateral view, F) Propodeum, dorsal view.

FIGURE 2. Carinadelius medicus Ranjith & van Achterberg gen. et sp. nov., holotype, female A) Antennae, lateral view, B) Metasoma, dorsal view, C) Wings.