Carinadelius Ranjith & van Achterberg,

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

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Carinadelius Ranjith & van Achterberg

gen. nov.

Carinadelius Ranjith & van Achterberg  gen. nov.

Figs 1–2View FIGURE 1View FIGURE 2

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

Description. Female.

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

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

Wings. Fore wing: fore wing infuscated below pterostigma and near vein cu-a ( Fig. 2CView FIGURE 2). Pterostigma wide ( Fig. 2CView FIGURE 2). Vein 1SR+M connected with vein 1-M ( Fig. 2CView FIGURE 2). Vein M+CU distinctly curved ( Fig. 2CView FIGURE 2). Vein cu-a postfurcal ( Fig. 2CView FIGURE 2). Vein r absent ( Fig. 2CView FIGURE 2). Vein r-m absent ( Fig. 2CView FIGURE 2). Vein m-cu postfurcal ( Fig. 2CView FIGURE 2). Veins 2-SR and SR1 connected with pterostigma ( Fig. 2CView FIGURE 2). Vein 1-R1 long ( Fig. 2CView FIGURE 2). Veins 2-1A and CU1b absent ( Fig. 2CView FIGURE 2). Subdiscal cell open ( Fig. 2CView FIGURE 2). 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. 1EView FIGURE 1). Hind coxa smooth ( Fig. 1EView FIGURE 1). Hind femur and tibia distinctly flattened ( Fig. 1AView FIGURE 1). Hind tibial spurs long. Hind basitarsus long. Tarsal claw simple.

Metasoma. Metasoma smooth, 6-segmented ( Fig. 2BView FIGURE 2). Tergites 1–3 immovably joined ( Fig. 2BView FIGURE 2). First tergite distinctly notched antero-medially ( Fig. 2BView FIGURE 2). First and second metasomal suture absent ( Fig. 2BView FIGURE 2). 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).