Dendrocerus scutellaris Trietsch & Miko

Trietsch, Carolyn, Miko, Istvan, Notton, David G. & Deans, Andrew R., 2018, Unique extrication structure in a new megaspilid, Dendrocerusscutellaris Trietsch & Miko (Hymenoptera: Megaspilidae), Biodiversity Data Journal 6, pp. 22676-22676 : 22676

Dendrocerus scutellaris Trietsch & Miko sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: NHMUK010812028 ; recordedBy: D Janzen & I. Gauld; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: http://grbio.org/institution/frost-entomological-museum-penn-state-university/53e1ac2c-ea1c-4ff2-8649-5017127e66b9; Taxon: scientificName: Dendrocerusscutellaris; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hymenoptera; family: Megaspilidae; genus: Dendrocerus; specificEpithet: scutellaris; taxonRank: species; Location: country: Costa Rica; countryCode: CR; stateProvince: Guanacaste; verbatimLocality: COSTA RICA: Guanacaste Pr.: Santa Rosa N. P.: 300m Bosque San Emilio; verbatimElevation: 300m; Identification: identifiedBy: Carolyn Trietsch; dateIdentified: 2017; Event: eventDate: 1985-04-27/5-11; verbatimEventDate: 27.iv-11.v.1985; eventRemarks: sample SE.6.C. BMNH(E) 2008-87; Record Level: language: en; institutionID: http://biocol.org/urn:lsid:biocol.org:col:34665; institutionCode: NHMUK; collectionCode: Insects; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: NHMUK010812044 ; recordedBy: D Janzen & I. Gauld; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: http://grbio.org/institution/frost-entomological-museum-penn-state-university/19410856-81ec-4ea2-b003-861d28be9fab; Taxon: scientificName: Dendrocerusscutellaris; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hymenoptera; family: Megaspilidae; genus: Dendrocerus; specificEpithet: scutellaris; taxonRank: species; Location: country: Costa Rica; countryCode: CR; stateProvince: Guanacaste; verbatimLocality: COSTA RICA: Guanacaste Pr.: Santa Rosa N. P.: 300m Bosque San Emilio; verbatimElevation: 300m; Identification: identifiedBy: Carolyn Trietsch; dateIdentified: 2017; Event: eventDate: 1985-10-5/26; verbatimEventDate: 5-26.x.1985; eventRemarks: sample SE.6.C. BMNH(E) 2008-87; Record Level: language: en; institutionID: http://biocol.org/urn:lsid:biocol.org:col:34665; institutionCode: NHMUK; collectionCode: Insects; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: NHMUK010812045 ; recordedBy: D Janzen & I. Gauld; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: http://grbio.org/institution/frost-entomological-museum-penn-state-university/60cf3fa8-009b-4b7e-a529-fc933f737604; Taxon: scientificName: Dendrocerusscutellaris; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hymenoptera; family: Megaspilidae; genus: Dendrocerus; specificEpithet: scutellaris; taxonRank: species; Location: country: Costa Rica; countryCode: CR; stateProvince: Guanacaste; verbatimLocality: COSTA RICA: Guanacaste Pr.: Santa Rosa N. P.: 300m Bosque San Emilio; verbatimElevation: 300m; Identification: identifiedBy: Carolyn Trietsch; dateIdentified: 2017; Event: eventDate: 1985-07-5/8-3; verbatimEventDate: 13.vii-3.viii.1985; eventRemarks: sample SE.6.C. BMNH(E) 2008-87; Record Level: language: en; institutionID: http://grbio.org/cool/29fv-ztxs; institutionCode: PSUC; collectionCode: Insects; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence: catalogNumber: NHMUK010812030 ; recordedBy: D Janzen & I. Gauld; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: http://grbio.org/institution/frost-entomological-museum-penn-state-university/50d80e83-a282-43c7-9514-eb821ee2b64f; Taxon: scientificName: Dendrocerusscutellaris; kingdom: Animalia; phylum: Arthropoda; class: Insecta; order: Hymenoptera; family: Megaspilidae; genus: Dendrocerus; specificEpithet: scutellaris; taxonRank: species; Location: country: Costa Rica; countryCode: CR; stateProvince: Guanacaste; verbatimLocality: COSTA RICA: Guanacaste Pr.: Santa Rosa N. P.: 300m Bosque San Emilio; verbatimElevation: 300m; Identification: identifiedBy: Carolyn Trietsch; dateIdentified: 2017; Event: eventDate: 1985-07-5/8-3; verbatimEventDate: 13.vii-3.viii.1985; eventRemarks: sample SE.6.C. BMNH(E) 2008-87; Record Level: language: en; institutionID: http://biocol.org/urn:lsid:biocol.org:col:34665; institutionCode: NHMUK; collectionCode: Insects; basisOfRecord: PreservedSpecimen

Description

Body length universal: 2.6-2.7 mm.

Colouration: Colour hue pattern: head and mesosoma black; metasoma, mouthparts, legs and scape except for the basal part dark brown; base of scape light brown. Colour intensity pattern: proximal part of scape lighter than the rest of the scape.

Head: Cephalic size (csb): mean: 750-1100 μm. Head height (lateral view) vs. eye height (anterior view): HH:EHf=1.25-1.75. Head height vs. head length: HH:HL=1.2-1.5. Head width vs. interorbital space: HW:IOS=1.6-1.9. Head width vs. head height: HW:HH=1.5-2.0. Male ocular ocellar line vs. lateral ocellar line: OOL:LOL=2.1-2.6. Male ocular ocellar line vs. posterior ocellar line: OOL:POL=0.95-1.0. Female ocular ocellar line vs. lateral ocellar line: OOL 1.6-2.5 x as long as LOL. Anterior ocellar fovea shape: fovea not extended ventrally into facial sulcus. Occipital carina sculpture: crenulate. Median flange of occipital carina count: absent. Preoccipital carina count: present. Preoccipital lunula count: present. Preoccipital furrow count: present. Preoccipital furrow anterior end: preoccipital furrow ends inside ocellar triangle. Dorsal margin of occipital carina vs. dorsal margin of lateral ocellus in lateral view: occipital carina is ventral to lateral ocellus in lateral view. Transverse scutes on upper face count: absent. Rugose region on upper face count: present. Rugose sculpturing on head and mesosoma count: present. Facial pit count: facial pit present. Intertorular carina count: present. Ventral margin of antennal rim vs. dorsal margin of clypeus: not adjacent. Median region of intertorular area shape: concave. Subtorular carina count: present. Torulo-clypeal carina count: present. Supraclypeal depression count: present. Supraclypeal depression structure: absent medially, represented by two grooves laterally of facial pit. Antennal scrobe count: absent. Mandibular tooth count: 1. Mandibular lancea count: absent. Distal edge of mandible: flat.

Antennae: Male flagellomeres shape: branched. Male scape length vs combined length of F1+F2: longer or equal. 6th male flagellomere length vs. width, “sensillar” view: elongate, more than 2x as long as wide. Male flagellomere branches count: 7 branches; 8 branches. Branch of male flagellomere 5 length compared to flagellomere 6: longer than length of flagellomere 6. Branch of male F5 length vs. length of male F5: longer than length of flagellomere 5. Male F6 length vs. combined length of F7+F8: shorter than length of flagellomere 7+8. Sensillar patch of the male flagellomere pattern: F7-F9. Basal resilin-rich area of male antennal branches count: absent. Female F1 length vs. pedicel length: 1.0-1.2. Female ninth flagellomere length: F9 less than F7+F8.

Mesosoma and Metasoma: Ventrolateral invagination of the pronotum count: present. Notaulus posterior end location: adjacent to transscutal articulation. Speculum ventral limit: not extending ventrally of pleural pit line. Mesoscutellar comb count: present. Mesoscutal length vs. anterior mesoscutal width: MscL/AscW=1.2-2.0. Anterior mesoscutal width vs. posterior mesoscutal width: AscW/PscW=0.7-0.9. Median mesoscutal sulcus posterior end: adjacent to transscutal articulation. Axillular carina count: absent. Scutoscutellar sulcus vs. transscutal articulation: adjacent. Mesometapleural sulcus count: present. Metapleural carina count: present. Anteromedian projection of the metanoto-propodeo-metapecto-mesopectal complex count: present. Anteromedian projection of the metanoto-propodeo-metapecto-mesopectal complex shape: Bifurcated.

Male Genitalia: Distal margin of male S9 shape: convex. Proximolateral corner of male S9 shape: blunt. Proximodorsal notch of cupula count: absent. Gonostyle/volsella complex proximodorsal margin shape: with deep concavity medially. Submedian conjunctiva on distoventral margin of gonostyle/volsella complex: length (range of fusion of parossiculus/parossiculus complex from gonostipes): more than 4/5. Apical parossiculal seta number: one. Dorsal apodeme of penisvalva count: absent. Distal projection of the penisvalva count: absent. Sensillar plate of the aedeagus shape: distinctly less than half as wide as the male genitalia. Distal projection of the parossiculus count: present. Dorsomedian conjunctiva of the gonostyle-volsella complex count: absent. Cupula length vs. gonostyle-volsella complex length: cupula less than 1/2 the length of gonostyle-volsella complex in lateral view. Parossiculus count (parossiculus and gonostipes fusion): present (not fused with the gonostipes). Distoventral submedian corner of the cupula count: absent. Harpe length: harpe shorter than gonostipes in lateral view.

Diagnosis

Dendrocerus scutellaris (Figs 1, 2, 3, 4, 5, 6) belongs to the Dendrocerus halidayi species group ( Dessart 1995, Dessart 1999), based on the branched male flagellomeres, bifid anteromedian projection of the metanoto-propodeo-metapectal complex and the presence of parossiculal projections with 3 parossiculal setae. This species is distinguished from all other ceraphronoid species by the presence of the mesoscutellar comb, an anatomical cluster that is composed of a row of spines medially on the mesoscutellar-axillar complex. This species is also unique amongst Ceraphronoidea in that the distal edge of mandible is flat and not pointed.

Etymology

This species is named for the presence of the mesoscutellar comb, which is unique to this species and is not found in any other known ceraphronoid species.

Distribution

This species is only known from Costa Rica.

Figs 1-6