Schoutedenia ralumensis Rubsaamen 1905

Schoutedenia ralumensis Rübsaamen, 1905 Materials Type status: Other material. Occurrence: catalogNumber: coll #. 111103 HR – 6; recordedBy: Hwalran Choi; individualCount: 12; sex: female; lifeStage: oviparous females; occurrenceStatus: present; associatedOccurrences: host: Phyllanthus sp; associatedSequences: PP 976464; occurrenceID: 6577854F-48BB-5AFC-AECB-A3BF2AA5CD7E; Taxon: taxonID: 905396; namePublishedInID: Rübsaamen, E. H. 1905. Beiträge zur Kenntnis aussereuropäischer Zooceciden. Marcellia (Rivista Internazionale di Cecidologia) 4: 1–25; namePublishedIn: Rübsaamen, 1905; higherClassification: Animalia; kingdom: Animalia; phylum: Arthropod; class: Insects; order: Hemiptera; family: Aphididae;; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hemiptera; family: Aphididae; genus: Schoutedenia; specificEpithet: ralumensis; taxonRank: species; nomenclaturalCode: ICZN; taxonomicStatus: accepted; taxonRemarks: species; Location: continent: Asia; country: Cambodia; countryCode: KH; stateProvince: Koh Kong; locality: Koh Kong Forest Station; decimalLatitude: 11.589; decimalLongitude: 103.354; geodeticDatum: WGS 84; coordinateUncertaintyInMeters: 100; Identification: identifiedBy: Hwalran Choi; dateIdentified: 16-05-2025; Event: samplingProtocol: hand collected; year: 2011; month: 11; day: 11; Record Level: type: specimen; modified: 16-05-2025; language: en; rights: Seoul National University; accessRights: not for profit use only; institutionID: NPRI; collectionID: SNU; basisOfRecord: PreservedSpecimen Description Oviparous female. Colour in life (Fig. 1): Body wholly dark green with vertical stripes on dorsum. Head light green. Ant and legs pale brown. Pigmentation on slide: Head pale like Ant. I-II. (Fig. 2 A). Thorax and abdomen pale with dark marginal pigmented sclerites on tergites II – VI (Fig. 2 A). Ant wholly pale, except distal part of Ant. IV, Base and PT (Fig. 2 B). URS pale (Fig. 2 D). Legs pale brown like SIPH, paired spinal processes and cauda (Fig. 2 A-F). GP dusky (Fig. 2 F). Morphology. Body oval-shaped, 1.52–1.77 mm long from the most forward point of the frons to end of cauda (Table 1). Head: Whole surface of ventrum smooth, that of dorsum granulated; two pairs of setae present on vertex; frons flattened. Antennae 0.44–0.59 times BL, Ant. Ι granulated with 1–2 setae, Ant. II granulated with 2–3 setae, Ant. III without secondary rhinaria with 2–11 setae, longest seta on Ant. III 0.005 –0.008 mm and 0.17–0.25 times that of Ant. IIIBD, Ant. IV and between Base and Pt with one primary rhinarium, each. PT 0.56–1.01 times longer than Base. Clypeus without setae, mandibular laminae with 4 setae, rostrum reaching the hind coxae, URS rounded, 0.38–0.68 times longer than PT, 0.26–0.52 times longer than Base with 2–4 median setae. Thorax: Prothorax without spinal setae, with one pair of marginal setae. Hind coxae spinulate with 2 acute setae (0.012 mm), trochanter smooth, hind femur with 9–25 round pseudosensoria; first segment of each tarsus smooth with 2 setae (0.026 mm) at apex. Mesosternal furca developed with the arms of the furca separated from each other (Fig. 2 H). Abdomen: Abdominal segments with faint reticulation, marginal pigmented sclerites distinctly protuberant on tergites II – VI, 2 setae (0.012 mm) on tergite VI between the SIPH, paired spinal processes (spine) on tergite VII, 2 setae on tergite VIII. SIPH truncate conical, 0.56–1.15 times cauda (Fig. 2 E), 0.08–0.15 times hind femur, distal half with concentric rings. GP dusky like head, with 2 median setae (0.018 mm). Cauda broadly rounded with 2–5 setae (0.090 mm). Distribution Africa, Bangladesh, Cambodia (new record) (Fig. 3), Laos, India, Australia and Papua New Guinea (Favret and Aphid Taxon Community, eds 2025). Notes The oviparous females of Schoutedenia ralumensis are distinguished from other species and forms within the genus by possessing pseudosensoria on the hind femur rather than on the hind tibia — an atypical and potentially diagnostic feature. While the apterous form of this species is typically known to be lemon-yellow or green without stripes when alive, the oviparous form, described here for the first time, displays a green to dark green body with vertical stripes resembling those of a water melon (Fig. 1). The last antennal segment (base and PT) is entirely dark (Fig. 2 B). The mesosternal furca is well-developed, with its arms distinctly separated (Fig. 2 H). Additionally, the abdominal spiracles are either surrounded by a sclerotised area or raised (Fig. 2 A). Other morphological characteristics are consistent with those of viviparous females. Host plant The Cambodian S. ralumensis feeds on the undersides of leaves and stems of Phyllanthus species (Phyllanthaceae). Other genera of Phyllanthaceae, such as Breynia, Bridelia, Flueggea and Glochidion, have also been recorded as host plants for this species (Favret and Aphid Taxon Community, eds 2025).

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