Marilia malickyi, 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 : 84-87

Marilia malickyi , new species

Figs 189–196

Marilia malickyi , new species is separated from most species in the genus by having light-spotted forewing membrane and light spots on the anterior costal band of the hind wings. Also M. mogtiana Malicky from Thailand has light spotted forewings but M. malickyi is easily separated from that species in having different forewing venation, i.e. R4, R5 and M1+2 not meeting at one point as they do in M. mogtiana . The genitalia of M. malickyi has the apicolateral corner of tergum IX formed into a large triangular plate above the articulation of the preanal appendages, while in M. mogtiana this plate is absent; and M. malickyi has no dorsal longitudinal sutures on segment IX, which is well developed in M. mogtiana .

Male (in alcohol). Body medium-sized; dark; legs, antennae and palps slightly paler than body; cephalic and thoracic setal warts brown; forewing membranes brown, light spotted; hind wings with light spotted anterior costal area. Eyes black, large. Vertex constricted; interocular distance varying between 1/3rd and 1/2 the eye width; about 3 times longer than broad. Ocelli absent. Tentorium slender, with short vestigial dorsal arm; posterior arms robust, ending in pair of large posterior tentorial pits; tentorial bridge separating anterior and posterior tentorial arms slender, without anteromesal or posteromesal protuberances; posterior half of anterior tentorial arms thin, anterior half more robust than posterior half, with well-developed median lamellate lobes. Facial groove pattern simple. Frons with pair of short, wide, laterally fragmented brown setose wart with whitish alveoli, or setal theca, and enlarged antennal sockets. Anterior remnant of frontal grooves invisible. Frontogenal vertical groove invisible. Frontogenal compact warts long, brown, vertically elongated. Clypeo genal vertical grooves located ventrally of anterior tentorial pits; running obliquely laterad, not reaching subgenal process. Subantennal grooves running vertically in narrow strip between ocellar groove and frontogenal compact setose warts; subocular groove not visible. Vertexal groove pattern simple, constricted; coronal groove almost complete, forming straight line in middle of vertex, anterior end vestigial [specimens from Perak ( Malaysia) have complete coronal groove]. Postoccipital grooves encircling foramen magnum and postoccipital lobes. Labrum small, short, with median setal area; anterior part movable, freely hanging. Mandibles almost indiscernible; lacinia broad, setose. Pair of rounded vertexal lateroantennal warts present on vertex, slightly compressed, elongate, drop-shaped, widest anteriorly. Vertexal mediantennal compact setose warts separate. Occipital compact setose warts large, triangular at posterior end of coronal grooves. Pair of sensilla basiconicae rounded, located at end of coronial groove, close to occipital warts. Pair of postgenal compact warts present along postgenal areas, curving along posterior part of ocular grooves; narrow strips pressed to ocular grooves. Postgenal surfaces glabrous, postgenal surfaces hidden by eyes. Maxillary palp formula V-(II, III, IV)-I; subapicomesal nodule absent on basal segment. Scapes shorter than head. Each pedicel shorter than each first flagellar segment; flagellae almost 2 times longer than forewings. Pair of pronotal warts present, with chestnut brown surface and dark setae; transversely elongate, occupying entire pronotum; almost touching mesally; narrowest laterally. Pair of mesoscutal setose warts diffuse, composed of few light alveoli arranged in longitudinally elongating, short, narrow, irregular patch on middle of dorsal surface of mesoscutum; mesoscutal setose warts separated by median notal groove. Almost entire surface of mesoscutellar area chestnut brown, with few large alveoli; diffused warts scattered among numerous small light dots. Each proepisternum with small-sized, ovoid setose warts, smaller than setose wart on each 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; dark pattern of cervical sclerite complex clearly visible on pale membranous neck. Legs claws symmetrical; spur formula 2, 4, 4; foreleg spurs almost equally long; midleg posteroapical spurs 2 times longer than anteroapical and anterosubapical spurs; posterior spurs 1/4th as long as anterior spurs. Hind leg posterior spurs half as long as anterior spurs. Forewings: length 8.0 mm; narrow with concave termen; membrane brown, light-spotted; setae darker, not forming visible pattern; 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 I and II present; fork I sessile, fork II short petiolate; crossveins s, r-m and m-cu present; postanal vein present. Hind wings: R1 long, running to R2 near wing apex; fork I slightly longer than fork II; long setal brush absent.

Male genitalia. Abdominal segment IX fused annularly, with 1 longitudinal groove running apicad, reaching distal margin of apical lobes at dorsum of articulation of gonocoxites; dorsal longitudinal grooves absent; tergum IX slightly longer than venter; anterior margins straight, vertical, with small lobe at confluence of ventral sutures; posterior margins with rounded apical lobe, deeply excised at preanal appendages; lateroapical corners of tergum IX forming large triangular plate over articulation of preanal appendages. Antecostae well developed, lacking on dorsum, forming dark marginal rim connected to longitudinal grooves; spine rows absent on posterior margins of segment IX; setose areas absent on apicopleural and apicoventral areas. Intersegmental depression between segment IX and segment X slightly sloping. Segment X weakly pigmented, forming quadrangular plate with rounded apex, slightly longer than gonocoxites in lateral view; in dorsal view with central longitudinal ridge separating lateral concavities; long triangular running nearly to apex of segment. Apicoventral setose lobes represented by few subapical setae. Apicodorsal setose area not discernible. Apex of segment X filled; dorsal interlobular gap minute. Preanal appendages long, filiform in lateral and dorsal view; with apicodorsal margins directed slightly ventrad in lateral view. Gonocoxites slightly shorter than segment X; longer than preanal appendages; coxopodites straight curving basally, almost parallel-sided both along their length in lateral and ventral view; harpagones slightly clavate, with small coneshaped setae in ventral view. Phallic apparatus forming basally curving phallotheca and apically membranous endotheca. Phallicata indiscernible. Phallotremal sclerites small.

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 (15 males NRM, 2 males OPC) ; 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); Tong Om Village , 552 m, UTM 47Q0750111, 2321825, 1.v.2005, light trap, loc 30 [N. Jönsson, T. Malm & B. Viklund] – 8 males, 4 females ( NRM). Vientiane Prov. : Vang Vieng, Nam Xong River , upstream bamboo footbridge, 36 3m, UTM 48Q0223506, 2115465, 26.iv.2005, light trap, loc 10 [N. Jönsson, T. Malm & B. Viklund] – 3 male ( OPC). MALAYSIA: Perak, Halong stream IX–X. 1993 light [G. S. Robinson] – 25 males, 3 females ( NHML) ; ditto, except – 25 males, 8 females ( NHML). MALAYSIA: West-Malaysia, Belum Expedition, Lichtfang Falle 1, 27.xii.1993 [M. Erle] – 1 male ( OPC). VIETNAM: Quang Tri Province, Da Krong Nature Reserve , near HQ, loc. No. 119, centered at 16 o 36 ’ N 106 o 52 ’ E, 13.xi.2007, at light [G. Csorba] — 1 male ( OPC). VIETNAM: Quang Tri Province, Huong Hoa District , Huong Hoa Nature Reserve , near Cup Village , 400 m, loc. No. 92, centered at 16 o 56 ’ 15N 106 o 34 ’ 52E, 7–10.xi.2007, at light [G. Csorba] — 1 male ( OPC) .

Distribution: Laos, Vietnam, Malaysia.

Etymology: Malickyi, named after Dr. Hans Malicky in recognition of his great contributions to caddisfly taxonomy, and for his invaluable assistance during this study.

Figures

FIGURES 189–191. Marilia malickyi, new species, holotype. 189 —head, frontal; 190 —head, dorsal; 191 — tentorium, dorsal.

FIGURES 192–196. Marilia malickyi, new species, holotype. 192 — right forewing; 193 — genitalia, lateral; 194 — genitalia, dorsal; 195 — gonocoxite, ventral; 196 — phallus, lateral.