Agramma (Agramma) izuense, Souma, 2024
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publication ID |
https://dx.doi.org/10.3897/dez.71.108270 |
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publication LSID |
lsid:zoobank.org:pub:4DB4BB24-7179-4A63-A644-8C4DE86AFC6F |
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persistent identifier |
https://treatment.plazi.org/id/23E9D009-B96B-4905-91B8-D783B3BF0ECD |
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taxon LSID |
lsid:zoobank.org:act:23E9D009-B96B-4905-91B8-D783B3BF0ECD |
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treatment provided by |
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scientific name |
Agramma (Agramma) izuense |
| status |
sp. nov. |
Agramma (Agramma) izuense sp. nov.
Figs 2B, C View Figure 2 , 3B View Figure 3 , 4B View Figure 4 , 5B-D View Figure 5 , 6B View Figure 6 , 7B View Figure 7 , 8B View Figure 8 , 9B View Figure 9 , 10C Japanese name: Hachijonaga-gunbai View Figure 10
Agramma nexile (non Drake, 1948): Tomokuni and Ishikawa (2002: 170) (distribution); Yamada and Tomokuni (2012: 188) (distribution: part); Yamada and Ishikawa (2016: 429) (distribution: part). Misidentifications.
Agramma japonicum (non Drake, 1948): Souma (2020: 532) (distribution: part). Misidentification.
Type series.
Holotype (submacropterous ♂, SIHU), "[JAPAN]: Izu Isls., Hachijo Is., Mitsune, Mt. Hachijo-Fuji" [=JAPAN: Izu Islands: Hachijo Island: Southeastern foothills of Mt. Hachijo-Fuji (approximate coordinates: 33°07'34.5"N, 139°47'10.7"E)], 18.v.2021, leg. J. Souma. Paratypes (submacropterous 46 ♂♂ 36 ♀♀), JAPAN: Izu Islands: Hachijo Island: as holotype (submacropterous 8 ♂♂ 4 ♀♀, SIHU); as holotype but 16.v.2021 (submacropterous 3 ♂♂ 6 ♀♀, SIHU); as holotype but 21.v.2021 (submacropterous 6 ♂♂ 10 ♀♀, SIHU); alt. 250-530 m of Mt. Hachijo-Fuji, 4.vii.2001, leg. M. Tomokuni (submacropterous 1 ♂, NSMT); Noboryo Pass, 17.v.2021, leg. J. Souma (submacropterous 9 ♂♂ 3 ♀♀, SIHU; 3 ♂♂ 4 ♀♀, TUA); as above but 5.vii.2001, leg. M. Tomokuni (submacropterous 5 ♂♂ 2 ♀♀, NSMT); Ohkago, 19.v.2021, leg. J. Souma (submacropterous 7 ♂♂ 5 ♀♀, SIHU); Western foothills of Mt. Hachijo-Fuji, 21.v.2021, leg. J. Souma (submacropterous 4 ♂♂ 2 ♀♀, SIHU). Eight specimens collected in 2001 were recorded as " Agramma nexile (Drake, 1948)" by the previous study ( Tomokuni and Ishikawa 2002).
Additional material examined.
Non-types (1 nymph, SIHU), Japan: Izu Islands : Hachijo Island: as holotype but 16.v.2021. The single nymph recorded above was in poor condition and was thus not described in the present study .
Diagnosis.
Agramma (Agramma) izuense sp. nov. is recognized among other species of Agramma by a combination of the following characters: pubescence on body less than 0.5 times as long as diameter of compound eye; antennal segment IV brown (Fig. 2B, C View Figure 2 ); posterior process in apical part and hemelytron sometimes irregularly dark (Fig. 5C View Figure 5 ); thoracic sterna, pygophore and female terminalia black (Figs 4B View Figure 4 , 6B View Figure 6 , 7B View Figure 7 ); head with a pair of frontal spines (Figs 3B View Figure 3 , 8B View Figure 8 ); rostrum reaching middle part of mesosternum; pronotum without paranotum; median carina of pronotum distinct on posterior process; anterior margin of hemelytron gently curved outward (Fig. 5B, D View Figure 5 ); apices of hemelytra separated from each other at rest; R+M (radiomedial) vein of hemelytron present in apical part, carinate throughout its length; costal area usually with 2 rows of areolae at widest part; discoidal-sutural area with 7-8 rows of areolae at widest part; outer and inner margins of paramere angularly curved in middle part (Fig. 9B View Figure 9 ); and female terminalia hexagonal in ventral view, with posterior margin protruding posteriad in middle part.
Description.
Submacropterous male. Head, calli, pronotal disc, basal part of posterior process, thoracic pleura, thoracic sterna, sternal laminae, apical part of tarsi and abdomen black; antenna, frontal spine, buccula, rostrum, collar, apical part of posterior process, hemelytron and legs except apical part of tarsi brown; apical part of posterior process and hemelytron sometimes irregularly dark; compound eyes dark red; pubescence on body yellowish (Figs 2B View Figure 2 , 3B View Figure 3 , 4B View Figure 4 , 5B, C View Figure 5 , 6B View Figure 6 ).
Body (Fig. 2B View Figure 2 ) oblong; pubescence on body less than 0.5 times as long as diameter of compound eye. Head (Figs 3B View Figure 3 , 8B View Figure 8 ) glabrous, with a pair of frontal spines; frontal spines separated from each other at apices, not reaching apex of clypeus; antenniferous tubercles obtuse, slightly curved inward; clypeus smooth; vertex coarsely punctate. Compound eye round in dorsal view. Antenna densely covered with pubescence throughout its length and tiny tubercles in segments I to II; segment I cylindrical; segment II cylindrical, shortest among antennal segments; segment III longest among antennal segments; segment IV cylindrical, longer than segment I. Bucculae contiguous with each other at anterior ends, with 3 rows of areolae throughout their length. Rostrum (Fig. 4B View Figure 4 ) reaching middle part of mesosternum.
Pronotum (Figs 3B View Figure 3 , 8B View Figure 8 ) unicarinate, without paranotum. Pronotal disc coarsely punctate. Hood absent. Collar coarsely punctate; anterior margin gently curved inward. Calli smooth. Median carina ridge-like, distinct on posterior process. Posterior process well-developed, flattened, triangular. Thoracic pleura coarsely punctate. Ostiolar peritreme oblong. Mesosternum (Fig. 4B View Figure 4 ) as wide as metasternum at widest part. Sternal laminae nearly straight throughout their length. Legs smooth, covered with pubescence.
Hemelytron (Fig. 5B, C View Figure 5 ), extending beyond apex of abdomen; anterior margin gently curved outward; apices separated from each other at rest; C (costal) and R+M (radiomedial) veins present, carinate throughout their length; Cu (cubital) vein indistinct; costal area usually with 2 rows of areolae at widest part, rarely with a single row throughout its length; subcostal area with 3-4 rows of areolae at widest part; discoidal-sutural area with 7-8 rows of areolae at widest part; hypocostal lamina with a single row of areolae throughout its length.
Abdomen oblong in dorsal and ventral views. Pygophore (Fig. 6B View Figure 6 ) compressed dorsoventrally, semicircular in ventral view, covered with pubescence. Paramere (Fig. 9B View Figure 9 ) slender, expanded in middle part; outer and inner margins angularly curved in middle part, covered with pubescence in middle part.
Measurements (n = 20). Body length with hemelytra 2.1-2.4 mm; maximum width across hemelytra 0.8-0.9 mm; length of antennal segments I to IV 0.2 mm, 0.1 mm, 0.5 mm, and 0.3 mm, respectively; pronotal length 0.8-0.9 mm; pronotal width across humeri 0.6 mm; hemelytral length 1.4-1.6 mm; maximum width of hemelytron 0.4-0.5 mm.
Submacropterous female. General habitus very similar to that of male (Figs 2C View Figure 2 , 5D View Figure 5 , 7B View Figure 7 ) except for the following characters: subcostal area of hemelytron wider than in male, with 4-5 rows of areolae at widest part; apical part of abdomen hexagonal in ventral view; posterior margin of terminalia protruding posteriad in middle part; and ovipositor with well-developed ovivalvula at base.
Measurements (n = 20). Body length with hemelytra 2.4-2.6 mm; maximum width across hemelytra 0.9-1.0 mm; length of antennal segments I to IV 0.2 mm, 0.1 mm, 1.5 mm, and 0.3 mm, respectively; pronotal length 0.9-1.0 mm; pronotal width across humeri 0.6-0.7 mm; hemelytral length 1.6-1.8 mm; maximum width of hemelytron 0.5-0.6 mm.
Remarks.
In a previous study, Agramma (Agramma) izuense sp. nov. was misidentified as A. (A.) japonicum ( Tomokuni and Ishikawa 2002), because both species are the most similar among the Asian species of the genus Agramma . However, the former is easily distinguished from the latter by the following characters: posterior process in apical part and hemelytron sometimes irregularly dark (brown in A. (A.) japonicum ) (Figs 2B, D View Figure 2 , 5C, E View Figure 5 ); apices of hemelytra separated from each other at rest (close to each other in A. (A.) japonicum ) (Figs 2C View Figure 2 , 5B, D View Figure 5 ); R+M (radiomedial) vein carinate throughout its length (carinate in basal part and not carinate in apical part in A. (A.) japonicum ); and costal area usually with 2 rows of areolae at widest part (a single row in A. (A.) japonicum ). Morphological differences between the new species and the other two Japanese species are provided in the identification key below.
On the other hand, the new species is similar in general appearance to A. (A.) ruficorne (Germar, 1835), which is widely distributed in the Palaearctic Region ( Péricart and Golub 1996; Aukema et al. 2013). Nevertheless, A. (A.) ruficorne shares the morphological features mentioned in the above paragraph with A. (A.) japonicum so that it is easily distinguished from A. (A.) izuense sp. nov.
Distribution.
Japan (Izu Islands: Hachijo Island) (Fig. 12 View Figure 12 ) ( Tomokuni and Ishikawa 2002; Yamada and Tomokuni 2012; Yamada and Ishikawa 2016; present study). Agramma (Agramma) izuense sp. nov. inhabits the forest floor in the warm-temperate climate of the Izu Islands in the Palaearctic Region.
Etymology.
The specific epithet refers to its occurrence in the Izu Islands, Japan; an adjective.
Host plants.
Carex sp. ( Cyperaceae ) (Fig. 11B View Figure 11 ) (present study). Although the host plant species could not be identified, Agramma (Agramma) izuense sp. nov. feeds only on this cyperaceous herb and appears to be monophagous.
Biology.
Agramma (Agramma) izuense sp. nov. feeds on the abaxial surface of the leaves of the abovementioned cyperaceous plant (present study). Dozens of type materials consisting of only submacropterous morphs were collected, suggesting that this new species is flightless. Adults and nymphs were collected in May and July ( Tomokuni and Ishikawa 2002; present study).
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