Agramma (Agramma) keramense, 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/5A41CB70-F8B5-4B30-8B29-A0B7CCFB6605 |
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taxon LSID |
lsid:zoobank.org:act:5A41CB70-F8B5-4B30-8B29-A0B7CCFB6605 |
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treatment provided by |
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scientific name |
Agramma (Agramma) keramense |
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sp. nov. |
Agramma (Agramma) keramense sp. nov.
Figs 2E, F View Figure 2 , 3D View Figure 3 , 4D View Figure 4 , 5F View Figure 5 , 6D View Figure 6 , 7D View Figure 7 , 8D View Figure 8 , 9D View Figure 9 , 10E-I Japanese name: Hosonaga-gunbai View Figure 10
Type series.
Holotype (submacropterous ♂, SIHU), "[JAPAN]: the Ryukyus, Okinawa Isls., Aka Is., Aka" [=JAPAN: Ryukyu Islands: Kerama Group: Aka Island: Aka (approximate coordinates: 26°11'43.7"N, 127°17'07.9"E)], 3.xi.2022, leg. J. Souma. Paratypes (submacropterous 13 ♂♂ 19 ♀♀), JAPAN: Ryukyu Islands: Kerama Group: Aka Island: as holotype (submacropterous 2 ♂♂ 5 ♀♀, SIHU); as holotype but 4.v.2021, leg. R. Ito (submacropterous 1 ♀, SIHU); as holotype but 5.v.2021, leg. R. Ito (submacropterous 3 ♂♂ 3 ♀♀, SIHU); as holotype but 17.vii.2021, leg. R. Ito (submacropterous 3 ♂♂ 3 ♀♀, SIHU). Geruma Island: Geruma, 3.xi.2022, leg. J. Souma (submacropterous 5 ♂♂ 7 ♀♀, SIHU).
Additional material examined.
Non-types (7 nymphs), Japan: Ryukyu Islands : Kerama Group: Aka Island: as holotype (6 nymphs, SIHU); as holotype but 5.v.2021, leg. R. Ito (1 nymph, SIHU). All 7 nymphs recorded above were in poor condition and are thus not described here .
Diagnosis.
Agramma (Agramma) keramense 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 light brown (Fig. 2E, F View Figure 2 ); posterior process in apical part and hemelytron light brown (Fig. 5F View Figure 5 ); thoracic sterna, pygophore and female terminalia dark brown (Figs 4D View Figure 4 , 6D View Figure 6 , 7D View Figure 7 ); head without spine (Figs 3D View Figure 3 , 8D View Figure 8 ); rostrum reaching posterior part of prosternum; pronotum without paranotum; median carina of pronotum indistinct on posterior process; anterior margin of hemelytron nearly straight; 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 with a single row of areolae throughout its length; discoidal-sutural area with 5 rows of areolae at widest part; outer and inner margins of paramere gently curved in middle part (Fig. 9D View Figure 9 ); and female terminalia hexagonal in ventral view, with posterior margin protruding posteriad in middle part.
Description.
Submacropterous male. Head black; calli, pronotal disc, basal part of posterior process, thoracic pleura, thoracic sterna, sternal laminae and abdomen dark brown; antenna, buccula, rostrum, collar, apical part of posterior process, hemelytron and legs light brown; compound eye dark red; pubescence on body yellowish (Figs 2E View Figure 2 , 3D View Figure 3 , 4D View Figure 4 , 5F View Figure 5 , 6D View Figure 6 ).
Body (Fig. 2E View Figure 2 ) oblong; pubescence on body less than 0.5 times as long as diameter of compound eye. Head (Figs 3D View Figure 3 , 8D View Figure 8 ) glabrous, without spine; 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, as long as segment II; segment II cylindrical; 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. 4D View Figure 4 ) reaching posterior part of prosternum.
Pronotum (Figs 3D View Figure 3 , 8D View Figure 8 ) without carina, without paranotum. Pronotal disc coarsely punctate. Hood absent. Collar coarsely punctate; anterior margin gently curved inward. Calli smooth. Posterior process well-developed, flattened, triangular. Thoracic pleura coarsely punctate. Ostiolar peritreme oblong. Mesosternum (Fig. 4D View Figure 4 ) as wide as metasternum at widest part. Sternal laminae nearly straight throughout their length. Legs smooth, covered with pubescence.
Hemelytron (Fig. 5F View Figure 5 ), extending beyond apex of abdomen; anterior margin nearly straight; 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 with a single row of areolae throughout its length; subcostal area with 3 rows of areolae at widest part; discoidal-sutural area with 5 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. 6D View Figure 6 ) compressed dorsoventrally, semicircular in ventral view, covered with pubescence. Paramere (Fig. 9D View Figure 9 ) slender, expanded in middle part; outer and inner margins gently curved in middle part, covered with pubescence in middle part.
Measurements (n = 14). Body length with hemelytra 2.2-2.4 mm; maximum width across hemelytra 0.5-0.6 mm; length of antennal segments I to IV 0.1 mm, 0.1 mm, 0.4 mm, and 0.2 mm, respectively; pronotal length 0.7 mm; pronotal width across humeri 0.4 mm; hemelytral length 1.6-1.7 mm; maximum width of hemelytron 0.3 mm.
Submacropterous female. General habitus very similar to that of male (Figs 2F View Figure 2 , 7D View Figure 7 ) except for the following characters: subcostal area of hemelytron wider than in male, with 4 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 = 19). Body length with hemelytra 2.4-2.5 mm; maximum width across hemelytra 0.6 mm; length of antennal segments I to IV 0.1 mm, 0.1 mm, 0.4 mm, and 0.2 mm, respectively; pronotal length 0.7 mm; pronotal width across humeri 0.4 mm; hemelytral length 1.7-1.8 mm; maximum width of hemelytron 0.3-0.4 mm.
Remarks.
Agramma (Agramma) keramense sp. nov. does not completely match the diagnosis of the genus Agramma provided by Souma (2020) because of the lack of spines on the head. However, the new species can be provisionally placed into Agramma based on the general similarity.
Among the Asian species of Agramma , A. (A.) keramense sp. nov. is most similar to A. (A.) vicinale (Drake, 1927) in its general habitus. However, based on a comparison between the type materials of the new species and the photographs of the holotype ( United States National Museum of Natural History 2023), together with the original description ( Drake 1927) of A. (A.) vicinale , two main characters were recognized to easily differentiate A. (A.) keramense sp. nov. from A. (A.) vicinale : head without spine (with a pair of frontal spines in A. (A.) vicinale ) (Fig. 3D View Figure 3 , 8D View Figure 8 ); and median carina of pronotum indistinct on posterior process (distinct in A. (A.) vicinale ). Morphological differences between the new species and the three other Japanese species are provided in the identification key below.
Distribution.
Japan (Ryukyu Islands: Kerama Group: Aka Island, Geruma Island) (Fig. 12 View Figure 12 ). Agramma (Agramma) keramense sp. nov. inhabits grasslands in the subtropical climate of Kerama Group of the Ryukyu Islands in the Oriental Region.
Etymology.
The specific epithet refers to its occurrence in Kerama Group, the Ryukyu Islands, Japan; an adjective.
Host plants.
Poaceae gen. et sp. indet. (present study) (Fig. 11D View Figure 11 ). Although the host plant genus and species could not be identified, Agramma (Agramma) keramense sp. nov. only feeds on this poaceous herb and appears to be monophagous.
Biology.
Agramma (Agramma) keramense sp. nov. feeds on the abaxial surface of the leaves of the aforementioned poaceous plant (present study). Dozens of type materials consisting of only submacropterous morphs were collected, suggesting that this new species is flightless. Adults were collected in May, July, and November, whereas nymphs were collected in May and November (present study).
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