Marilia enikiana, Oláh & Johanson, 2010

Oláh, János & Johanson, Kjell Arne, 2010, Description of 33 new species of Calamoceratidae, Molannidae, Odontoceridae and Philorheithridae (Trichoptera), with detailed presentation of their cephalic setal warts and grooves 2457, Zootaxa 2457 (1), pp. 1-128 : 75-78

Marilia enikiana , new species

Figs 168–177

This small-sized and light-coloured species is similar to Marilia aerope Malicky & Chantaramongkol from Thailand. It is easily discriminated from M. aerope in the genitalia, by having longer segment IX; more slen- der and filiform preanal appendages; and by the much broader and trilobed segment X seen in dorsal view. This species has a modified forewing and hind wing venation. The forewings vein M1+2 is confluent with R4+5 and R5 for a short distance, branching from R5 beyond the nygma. The hind wings vein R2+3 is separate for a very short distance and merges with R1 at the wing middle, like a short crossvein. The cephalic setal warts are strongly modified. The vertexal medioantennal compact setal warts are completely fused, without a vestigial septum of merged, thickened rim of the skeletal ring encircling the isolated setal theca or alveoli. This large, medioantennal compact setal wart dominates on the anterior part of the constricted vertex. The vertexal, lateroantennal compact setal warts are reduced to a very small setose area. Another unique character is the extremely long occipital compact setal warts.

Male (in alcohol). Body small, brown; legs, antennae and palps light brown, almost yellowish; wings unicoloured light brown without pattern. Eyes black; extremely large; vertex constricted to narrow strip; interocular distance 1/5th the eye width, almost 5 times longer than wide. Ocelli absent. Tentorium not examined. Facial groove pattern modified, frons dominated by single, nearly quadrangular or heart-shaped, large compact setose wart and enlarged antennal sockets. Anterior remnant of frontal groove (facial arms) branching from coronal groove, visible at ventral margin of antennal sockets. Frontogenal vertical groove not visible. Clypeogenal vertical grooves located ventrally of anterior tentorial pits; long, running obliquely laterad, reaching subgenal process. Subantennal groove running vertically in narrow strip between ocellar groove and frontogenal compact setose wart. Subocular groove merging to anterior clypeogenal grooves. Vertexal groove pattern simple, constricted to narrow stripe; coronal groove forming straight line in middle of vertexal stripe; postoccipital groove encircling foramen magnum, or occipital foramen. Labrum small, short, without setal warts, with movable anterior part, freely hanging. Mandibles almost indiscernible on uncleared head; lacinia broad. Central frontal setal warts large, compact, partially fused, heart-shaped on face beside elongate, narrow pair of frontogenal fragmented setal warts running from antennal sockets, along subantennal groove of pregenae, anteriorly narrowing. Narrow stripe of vertex with pair of small, elongate, vertexal lateroantennal compact setal warts. Pair of vertexal mediantennal compact setose warts fused, forming large area of ovoid setose wart behind interantennal area; without remnant septum of vestigial compressed rims of fused skeletal rings. Occipital compact setose warts well developed, modified into pair of narrow strips running along entire length of vertexal stripes and separated by coronal grooves. Pair of sense tubercles, or sensilla basiconicae, present, slightly longitudinally elongate along end of coronal grooves, surrounded by occipital warts. Vertically elongated postgenal compact warts curving along posterior section of ocular grooves; narrow strip pressed to ocular grooves. Postgenal surface glabrous, postgenal surface hidden by eyes. Maxillary palps darker than legs and antennae; maxillary palp formula II-IV-III-V-I; each basal segment without setose subapicomesal nodule. Each scape slightly shorter than head. Each pedicel shorter than first segment of each antennal flagella. One pair pronotal warts present, transversely elongated, located on posterior 1/3rd of pronotum, almost tangential on dorsum, mesally broad, narrowing laterally. Pair of mesal, almost fused, broad bands of mesoscutal diffuse setose warts present; longitudinally elongate, covering almost entire dorsal surface of mesoscutum; separated by median notal groove; mesal half dark brown, touching at mesal notal groove, forming dark mesal bands being broader on posterior 1/3rd; lateral parts lighter. Almost entire surface of mesoscutellar area covered by diffuse setal warts separated by median notal groove. Each proepisternum with small-sized, ovoid setose wart, being much smaller than setose wart on precoxale. Large, compact, setal wart present anteriorly on cervical sclerites; apparently forming sclerotized surface on membranous part of neck, touching only anterior cervical sclerite. Lateral cervical sclerites forming narrow anterior arm articulating anteriorly to back of head with occipital condyle above posterior tentorial pits, fused to posterior cervical sclerites; posterior cervical sclerite forming posterad broadening plate reaching prothoracic episternum, articulating to weakly sclerotized anteromedian band of prothoracic eusternum by ventral intercervical sclerites; structural pattern of cervical sclerite complex, dark, clearly visible on pale membranous neck. Legs claws symmetrical; spur formula 2, 4, 4. Foreleg spurs equally large; midleg posterior subapical spur half as long as anterior subapical spur; midleg posteroapical spur 1/4th as long as anteroapical spur; hind leg posteroapical spur 2 times longer than other spurs. Forewings: length 6.5 mm; membrane light brown without pattern; termen convex; R1 confluent with R2 shortly before C; base of discoidal cell located proximally of mid-length of wing; fork I longer than fork II; forks III-V absent; fork I sessile, fork II short petiolate, almost sessile; M1+2 short, merges with R5 after nygma. Hind wings: R1 meeting C subapically; R2 very short; fork I almost 2 times longer than fork II.

Male genitalia. Abdominal segment IX fused annularly, with 2 longitudinal grooves; most pronounced groove separating ventral and dorsal half in lateral view, running to end of apical lobe; less pronounces groove running to base of preanal appendages; tergum IX as long as venter; anterior margins straight, vertical, slightly convex at middle; apical lobes subtriangular, excised at preanal appendages; lateroapical corners of tergum IX not forming roof plate overhanging articulation of preanal appendages. Antecostae well developed, forming dark, marginal rims connected to broader longitudinal grooves; spine row absent on posterior margins of segment IX; setose areas absent on apicopleural and apicoventral areas. Intersegmental depression between segment IX and segment X gently sloping. Segment X weakly pigmented, forming quadrangular plate, as long as gonocoxites in lateral view; central ridge long, triangular in dorsal view, running to end of segment, accompanied by 2 small lateral lobes producing trilobed apex. Apicoventral setose lobes forming small setose surfaces behind lateral lobes. Apicodorsal setose area not discernible. Apex of segment X filled; dorsal interlobular gap absent. Preanal appendages long, filiform in lateral view; robust, parallel-sided, nearly truncate in dorsal view. Each coxopodite and harpago together as long as segment X; coxopodites straight, narrowing apicad in lateral and ventral view; harpagones small, narrow, slightly clavate in ventral view. Phallic apparatus with basal part strongly curved ventrad; straight at apical half in lateral view. Sclerotized phallotheca not clearly outlined. Endotheca and phallicata indiscernible. Small, elongated phallotremal sclerite present at beginning of phallicata; U-shaped in ventral view.

Holotype male: LAOS PDR: Luang Namtha Prov.: Nam Ha NBCA, Lakkhammai Village, Nam Leung stream, 749 m, UTM 47Q0744602, 2339873, 30.iv.2005, light trap, loc 29 [N. Jönsson, T. Malm & B. Viklund] – ( NRM).

Paratypes: same data as holotype – 17 males, 1 female ( NRM) . Luang Namtha Prov.: Nam Ha NBCA, Nam Gnang stream, 300 m upstr. Namgnen Village , 558 m, UTM 47Q0746256, 2321311, 29.iv.–1.v.2005, Malaise trap, loc 24 [N. Jönsson, T. Malm & B. Viklund] – 1 male ( NRM) ; Namming stream, 300 m upstr. Namming Village , 353 m, UTM 48Q0205691, 2173925, 27.iv–3.v.2005, Malaise trap, loc 13 [N. Jönsson, T. Malm & B. Viklund] – 1 male paratype ( OPC) . Vientiane Prov.: Vang Vieng, Nam Xong River , upstream bamboo footbridge, 363 m, UTM 48Q0223506, 2115465, 26.iv.2005, light trap, loc 10 [N. Jönsson, T. Malm & B. Viklund] – 1 male ( NRM) .

Distribution: Laos.

Etymology: Enikiana, named after Enikő Julia Oláh, the granddaughter of one of the authors (JO), to remember her big blue eyes.

Figures

FIGURES 168–171. Marilia enikiana, new species, holotype and allotype. 168 — male head, frontal; 169 — male head, dorsal; 170 — female head, frontal; 171 — female head, dorsal.

FIGURES 172–177. Marilia enikiana, new species, holotype. 172 — right wings; 173 — genitalia, lateral; 174 — genitalia, dorsal; 175 — gonocoxite, ventral; 176 — phallus, lateral; 177 — phallus, ventral.