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OT AA ae 4 : a en Yee iE ty neti te ee erent kA oe ae = ted ete ear Ss 6 to he Dek Dh OD ees EL hay be wate beim SoA Few ol, poe bare aap SP ee ait. - ree nh - A il tans vas Sateen wae omovies Oe Se eS ee LeeLee ett eee Tutiak oh OR oh MA RAN ALO Pct BE are Beet eee otk Pare ete eS SS te Ce ee eT Sere eee a ye ar nn he tAD he BD Re AN SAIN We Sore BVI SD FPMPERE rh vf phate Bi Wr aapeess WA > a atts Casters albed : +f fe wt 3 _ anaes . r * basa. 4 9h as Joon F pr eee : as ~ a oy. ~ ; ‘ Sabb tg yee eo pte ae steer nee Aca Pa fi tha ‘ z ares = Z > . a ake ; f stn wn wen 5 eee te Tee A eats thai - Stet ams ry De Fae Me tee ees nnn tee ahah Serene e renee ee tice ah ead eget Ry ereree ear ratee a Se ee MUS. COMP. ZOOL. LIBRARY i avo PEABODY MUSEUM YALE UNIVERSITY NUMBER 141. 26 DEC. 1969 A NEW GENUS AND SPECIES OF OSMYLIDAE (NEUROPTERA) FROM CHILE AND ARGENTINA, WITH A DISCUSSION OF PLANI- PENNIAN GENITALIC HOMO- LOGIES PHILLIP A. ADAMS POSTILLA Published by the Peabody Museum of Natural History, Yale University Postilla includes results of original research on systematic, evolution- ary, morphological, and ecological biology, including paleontology. Syntheses and other theoretical papers based on research are also welcomed. Postilla is intended primarily for papers by the staff of the Peabody Museum or on research using material in this Museum. Editors: Jeanne E. Remington and Nancy A. Ahlstrom Postilla is published at frequent but irregular intervals. Manuscripts, orders for publications, and all correspondence concerning publications should be directed to: Publications Office Peabody Museum of Natural History New Haven, Conn., 06520, U.S.A. Lists of the publications of the Museum are available from the above office. These include Postilla, Bulletin, Discovery, special publications, and available back numbers of the discontinued journal, Bulletin of the Bingham Oceanographic Collection. All except Discovery are available in exchange for relevant publications of other scientific institutions anywhere in the world. A NEW GENUS AND SPECIES OF OSMYLIDAE (NEUROPTERA) FROM CHILE AND ARGENTINA, WITH A DISCUSSION OF PLANIPENNIAN GENI- TALIC HOMOLOGIES PHILLIP A. ADAMS Department of Biology and Peabody Museum of Natural History, Yale University* ABSTRACT Phymatosmylus, a new genus of Stenosmylinae, is proposed for the new species Phymatosmylus caprorum, The genus is mor- phologically primitive in the position of the medial fork of the forewing, and in the partially free eighth abdominal tergite of the male. Osmylid female genitalia are prepared for examination by the customary clearing in KOH and staining in chlorazol black E, but removal of the internal structures from the abdomen, following cutting around the genital opening, makes details more visible than when examined in situ, as previously. The male gonarcus- mediuncus complex of Planipennia is probably derived from fused parameres, as in some Sialodea, and the articulation of the gono- coxites has shifted from the ninth tergite to the ends of the gonarcus. *Present address: Department of Biology, California State College, Ful- lerton, California 92631. POSTILLA 141: 11 p. 26 DECEMBER 1969. 2 POSTILLA INTRODUCTION The subfamilies Stenosmylinae and Kempyninae of the neurop- teran family Osmylidae (see systematic list at end of paper) are restricted to South America, Australia, New Zealand and Tas- mania. The only previously known New World example of the Stenosmylinae is Jsostenosmylus and of the Kempyninae, Kempynus falcatus Navas. Aside from the protosmyline Pary- phosmylus ornatus Kriiger, the only other described Recent osmylid from the New World is the highly aberrant Gumilla Navas, which is too poorly known for meaningful discussion. Narodona Navas, from Mexico, is probably an ithonid, judging from the illustrations. Carpenter (1943) has discussed the rela- tionships of the fossil species from the Florissant shales of Colorado; they belong to the Protosmylinae and the Kempyninae. In the course of examining the Neuroptera in the collection of the Peabody Museum, I have been able to study a series of a previously undescribed species from Chile belonging to a new genus of the Stenosmylinae. Additional material from Argentina has been made available by Ellis MacLeod. The osmylid subfamilies Stenosmylinae and Kempyninae have been revised by Kimmins (1940); his figures may be consulted, where reference is made to features of genera related to the new genus described below. In this group of osmylids, many features of the male genitalia may be discerned in dried material, as they are usually carried in an exposed position. However, due to shriveling of the soft, mem- branous structures, the appearance of the genitalia may be markedly different from that of material properly cleared and expanded in KOH and observed in glycerine. The gradual transi- tion from sclerite to membrane on mediuncus, gonarcus, and gonocoxites can only be suggested in a drawing. In Figures 2, 3, and 4, an attempt has been made to indicate, by stipple, areas which stain heavily with chlorazol black E. Previously, taxonomists have illustrated only the most readily observed portions of the female system, the spermathecae and their ducts. A study of several osmylid genera indicates that the remainder of the female reproductive system also has characters useful in systematics. As with male material, the abdomen is prepared for study by heating in 10% KOH solution, washing, and A NEW SPECIES OF OSMYLIDAE 3 staining in chlorazol black E. Removal from the abdomen is accomplished by cutting the membrane surrounding the gonopore and gently drawing the ducts out anteriorly, with forceps. It is virtually impossible to see the details of the delicate ducts and sacs in situ. The internal system may be dehydrated and perma- nently mounted on a slide, or reinserted into the abdomen after examination. This method of removal does no damage to the abdominal exoskeleton. Phymatosmylus, new genus DESCRIPTION. In forewing (Fig. 1A), MP forks halfway from base to apex; CuA bends sharply posteriad, anteriorly pectinate; 2A fuses with 1A opposite fused portion of RS+MA. In hindwing, basal piece of MA sinuate, joining R before origin of RS+MA, or absent. Proximal nygma of forewing opposite or slightly beyond divergence of RS and MA. Distal nygmata highly irregular; in male forewing, usually one or two, sometimes three, between proximal branch of RS and MA, sometimes one between last two branches of RS, and a few, usually small, between MA and MP. In hindwing, one distal nygma between last branch of RS and MA; one or two between last two branches of RS. All veins of male forewing thickened and filled with granular substance; in female, bases of Cu and 1A slightly thickened. In forewing, most crossveins with single dorsal seta, borne on swelling at midpoint. Fore coxa of female with two irregular rows of pedestalled setae (Fig. 8); arolium bilobed. TYPE. The type is the only known species, Phymatosmylus capro- rum. The name is derived from the Greek phyma, phymatos, a swelling, referring to the enlarged veins of the male forewing, plus - osmylus. DISCUSSION. Phymatosmylus is placed in the Stenosmylinae because of the thickened veins and the partial fusion of the eighth and ninth abdominal tergites of the male. Both the structure of the media in the forewing and the structure of the male abdomen appear transitional between the Stencsmylinae and the Kem- pyninae. In Osmylidae, the primitive position of the medial fork 4 POSTILLA FIG. 1. Phymatosmylus caprorum. A) Wings of a lightly pigmented male, showing venation and thickening of veins in forewing. B)Heavily pig- mented female. C) Moderately pigmented female. Abbreviations: b — basal piece of MA, CuA — cubitus anterior, CuP — cubitus posterior, MA — media anterior, MP — media posterior, n — nygma, RS — radial sector, 1A, 2A — first and second anal veins. in the forewing is near the base, as seen in fossil material (e.g., Sogjuta O. Martynova, Triassic) and in the Recent Protosmylinae. Phymatosmylus has this fork in an intermediate position; in other Stenosmylinae, it lies near the wing apex. In Oedosmylus and Isos- tenosmylus, CuA2 curves abruptly posteriad at the level of the A NEW SPECIES OF OSMYLIDAE 5 medial fork, and usually is anteriorly pectinate. Stenosmylus and Stenolysmus are more specialized in that MP2 has fused with CuA; the location of the medial fork in these genera is marked only by an oblique crossvein, as in the forewing of the Myrmeleon- tidae. Thickened forewing veins also occur in Oedosmylus, but in the female rather than in the male (Kimmins, 1940). The partially free eighth abdominal tergite in the male is more generalized than in the remainder of the Stenosmylinae, where the eighth and ninth tergites are completely fused. The female reproductive system of Phymatosmylus (Fig. 6) differs from that of Plethosmylus (Osmylinae) only in minor details. In the closely related genus Jsostenosmylus (Stenosmy- linae), which is more specialized in male genitalic characters and wing venation, the female reproductive system differs significantly from that of Phymatosmylus: the genital opening is located at the bottom of a large genital atrium; the copulatory bursa is expanded into a sac posteriorly to the attachment of the spermathecal canals; the slender dorso-median duct is absent; the oviduct is expanded laterally to form large folds enveloping the sides of the copulatory bursa, so that the spermathecal ducts arise from the bottom of a depression; the proximal connection of the fertilization canal is not apparent, and the canal extends much farther anteriad along the oviduct; a prominent duct joins the oviduct opposite the distal end of the fertilization canal. Most of these features of Jsostenosmy- lus appear to be specializations, but too few genera of osmylids have been examined to state this with assurance. These differences, however, are sufficiently fundamental to demonstrate the potential utility of the female system as a source of taxonomic characters. Phymatosmylus caprorum, new species DESCRIPTION. Head and antennae yellow, a brown spot at anterior mandibular articulation; ocelli black-bordered medially; vertex scars pale, variable in shape, usually large medial square and thick lateral band. Pronotum subrectangular, viewed from above, width slightly greater than length, yellow, bordered with lateral fuscous stripe; a thin median fuscous line on anterior half; setae long, pale except on lateral stripes. Meso- and metanota fuscous-mottled laterally, with broad median yellow stripe. Pleurae and legs pale, 6 POSTILLA spurs short, hind basitarsus as long as next three tarsomeres. Abdomen pale, tergites 1-7 fuscous; thin ventral fuscous line. Male with fused ninth tergite and ectoproct shiny, yellow. Gonarcus, gonocoxites and tenth sternite pale; tenth sternite setose (Figs. 2-4). Gonarcus and gonocoxites suspended from apical margin of ninth tergite. Mediuncus lobes membranous laterally, sclerotized medially, shaped as in Figures 2 and 3; extended prominently in dried specimens. An irregular, weakly sclerotized gonapsis anterior to gonopore, shaped similarly to hypandrium internum (Fig. 4, gps). A lightly sclerotized, setaless ring sur- rounds anus. Female eighth sternite concave, with anterior median hook, projecting angle at anterior margin of eighth tergite, lateral setose spatulate process opposite eighth spiracle (Fig. 7). Eighth gonocoxite narrowed medially, with rounded disclike apical lobes (Figs. 5, 7). Ninth tergite and gonocoxites pale, a black stripe on gonocoxite; setae on abdominal apex pale. Female genital opening single (Fig. 5, go); slender colleterial gland reservoir opens into copulatory bursa posteriorly, lined with microtrichia (Fig. 6). Thin duct, probably from bursal gland, joins copulatory bursa dorsally. Spermathecae spheroidal, ducts enter sclerotized anterior lobe of bursa; below this a short fertilization canal of typical externally microvillose appearance joins bursa at base of oviduct. Wing venation as in Figure 1A. Color varies from uniform light brown to pale with veins and membrane fuscous-mottled. In heavily marked individuals (Fig. 1B), on the forewing pale spots appear on basal subcostal area, scattered over disc; a pale line directed toward wing apex, and a row of small spots on posterior margin. Hind wing patterned similarly, but paler. Nygmata dark brown or black. MEASUREMENTS. Chilean specimens: forewing length, ¢ 20-(21.3)- 23 mm (N=7), 2 22-(22.5)-24 mm (N=6), antenna 7.4-8.4 mm (N=4). Argentine specimens: forewing length 25-26 mm (N=3), antenna length 6.5-6.8 mm (N=2). HOLOTYPE. Male, Las Cabras, “S. of Chillan vulcain”’, 36°49’S- 71°26’W, Nuble Province, Chile, elev. 1480 m, 10-23 Dec. 1954, Luis E. Pena, leg. Peabody Museum of Natural History. A NEW SPECIES OF OSMYLIDAE 7 FIG. 2. male abdominal apex, lateral view. FIG. 3, gonarcus and gono- coxites, posterior view. FIG. 4, same, ventral. Fic. 5, female abdomen, lateral view; fine dotted lines show location of spermathecae. FIG. 6, female genital system, cleared specimen. Fic. 7. female 8th sternite and gonocox- ite, ventral. FIG. 8, female left fore coxa, lateral, showing pedestaled setae. Abbreviations: a—anus, coll gl—colleterial gland, cop b— copula- tory bursa, ect — ectoproct, fe — fertilization canal, gex — gonocoxite, go— genital opening, gpr— gonopore, gps— gonapsis, gs— gonarcus, hyi — hypandrium internum, mu — mediuncus, ov i , sp — spermatheca, 8S — eighth sternite, 8T-— eighth tergite, 10S — tenth sternite. 8 POSTILLA PARATYPES. Same data as holotype, seven males, seven females. One ¢, one 2 in Museum of Comparative Zoology, Harvard, one ¢, one in British Museum (Natural History), one ¢, one 2 in Adams collection, remainder in Peabody Museum. Addi- tional paratypes: Las Trancas, Cord. Chillan, Nuble Prov., Chile, 21-30 Nov. 1964 (2 4), 1-10 Dec. 1964'(2 ¢ ), L. E. Pena;leg:, Adams collection; Alto de Vilches, Cordillera, [35°37’ S, 70° 21’ W]| Talca Prov., Chile. 21-23 Nov. 1964 (¢ ), leg. L. E. Pena. Lagi Currhué, 1000 m. [39°52’ S, 71°28’ W], Neuquén, Argen- tina, 26 Dec. 1954 (¢), Adams collection, purchase ex F. H. Walz; Pucara, Parque Nac. Lanin. Argentina, 30 Nov. 1959 (9 ), Adams collection, purchase ex F. H. Walz, Feb. 1951 (@), leg. S. S. Schajovskoy, MacLeod collection; Lago Hermoso, Parque Nac. Lanin, Neuquén, Argentina, Nov. 1949 (2), Dec. 1949 (¢), leg. S. S. Schajovskoy. Material from the Adams collection was not available for study when the foregoing description was written. DISTRIBUTION. This species appears confined to moist montane areas. The specimens from Argentina were collected in the lake region of Neuquén. Probably the Andes do not constitute an im- portant distributional barrier in this area, since several passes exist at 1200 meters elevation. The gap of approximately 300 kilometers between the Nuble localities, on the west slope of the Andes, and the Neuquén localities may be an artifact of collecting. HOMOLOGIES OF PLANIPENNIAN MALE GENITALIA The terminology used here differs from that of Tjeder, Kimmins, and other recent workers in several respects, but is consistent with my previous usage (e.g., MacLeod and Adams, 1968). The tenth sternite is often present in the Planipennia; it is nearly always setose, and in archaic forms it may be associated with the gonarcus (e.g., Psychopsidae, Acker, 1960, figs. 74-79, “ster- nite 11”). As Kimmins (1940) has pointed out, the tenth sternum of this subfamily is the most archaic to be found among the Planipennia. Along its ventral border extends the gonarcus, which may be a derivative of part of the tenth sternum, as Kimmins suggested. A NEW SPECIES OF OSMYLIDAE ¢ Another interpretation, which I consider more probable, is that the entire gonarcus-mediuncus complex has arisen from the fused parameres of Sialodea and Raphidiodea. The bilobed or bipartite structure of the planipennian mediuncus is apparent in most cases; even when the mediuncus is a single structure, it is ordinarily lightly sclerotized medially. Occasionally, the gonarcus similarly shows evidence of a paired origin (Oliarces, Acker, 1960, fig. 52, “coxopodite 9”). Among the Sialodea, the para- meres may be approximated at the midline (some species of Sialis) or show medial fusion and a pair of lobes (Corydalus), or occur as a bilobed medial process (Neohermes, Chauliodes). Thus, among the Sialodea, a gonarcus-like structure is commonly found, from which it is reasonable to consider that the planipen- nian gonarcus has been derived. In the Sialodea and Raphidiodea there is a difference in texture of the parameres and gonocoxites that offers a helpful guide to homologies: the parameres are never setose (in Sialodea, they are smooth, and in Raphidiodea, minutely spinose); in contrast, the gonocoxites, or claspers, are nearly always setose. Primitively, the gonocoxites articulate on the ninth tergite, but they are oc- casionally attached laterally to the fused parameres (Neohermes). In Planipennia, the articulation of the gonocoxites shifts to the gonarcus, but the setose condition is usually retained. Their structure is often still clasper-like (e.g., Myiodactylus, see Acker, 1960, fig. 152, “paramere”, and Psychopsidae, figs. 50-60, “para- mere”). In Phymatosmylus, the primitive attachment of the gonocoxites to the ninth tergite has persisted, in addition to the more advanced articulation with the gonarcus. Probable stages in the evolution of the mediuncus-gonarcus complex and gonocoxites may be summarized as follows: 1. A pair of plates (volsellae or parameres) lie laterally to the phallus (as in Agulla, Raphidiodea); these may be united dorsally to the phallus (Raphidia ophiopsis L.). Gonocoxites articulate on the ninth tergite. 2. A pair of plates dorsal to the genital opening, usually ap- proximated on the midline, each of which may bear a submedian process (Sialodea: Sialis). 3. Paramere plates fused medially to form a transverse band dorsal to the genital opening; usually with a pair of submedian processes. Gonocoxites may be articulated to the ninth tergite 10 POSTILLA (Sialodea: Corydalus) or appear as setose lateral lobes of the transverse band (Sialodea: Neohermes). 4. Paramere plates fused medially to form a transverse band (gonarcus) which bears a pair of movable, closely approximated submedian processes (mediuncus lobes); gonocoxites articulated laterally on the gonarcus (Planipennia: Dilar, Sisyra, and Osmy- lidae ). 5. Mediuncus lobes fused, often bifid apically or showing median suture; gonocoxites laterally articulated on gonarcus (most Planipennia). According to this interpretation, the gonocoxite corresponds to the “paramere” or the “entoprocessus” of Tjeder’s (1957) terminology, and the true parameres to his combined “gonarcus” and “‘mediuncus”. But the gonarcus and mediuncus bear very little resemblance to primitive parameres, and two separate terms are needed for them. Furthermore, use of the term paramere in this unusual sense would inevitably result in confusion. Therefore there appears to be strong justification for retention of Tjeder’s terms, gonarcus and mediuncus. The gonocoxites may as well be referred to as such, thus making it possible to avoid applying the rather ambiguous term paramere to any planipennian structure. Acker (1960) has generally identified the gonarcus as the “ninth coxopodite”, the mediuncus as the fused “styli’, and the ninth gonocoxites as “parameres”’; in the osmylid Porismus, how- ever, the mediuncus lobes are identified as “parameres” and the gonocoxites as “styli’. The small gonapsis-like structure has not been previously noted in osmylids; however, I have also found it in Porismus and Kempynus. ACKNOWLEDGMENTS Ellis G. MacLeod has kindly lent material from his collection, and contributed many useful comments; C. L. Remington has generously assisted during the progress of this study, and has made many helpful suggestions. Their aid is gratefully acknow- ledged. Thanks are also due to Luis E. Pena, the collector of the Chilean material, who is accomplishing so much toward achieving a better knowledge of the insect fauna of his country. A NEW SPECIES OF OSMYLIDAE 1] SYSTEMATIC LIST Order Neuroptera Suborder Raphidiodea Agulla, Raphidia ophiopsis L. Suborder Sialodea Sialis, Neohermes, Chauliodes, Corydalus Suborder Planipennia Osmylidae Osmylinae: Plethosmylus Protosmylinae: Paryphosmylus ornatus Kriger Stenosmylinae: /sostenosmylus, Oedosmylus, Stenosmylus, Stenolysmus, Phymatosmylus caprorum Adams Kempyninae: Kempynus falcatus Navas Porisminae: Porismus Incertae sedis: Gumilla Ithonidae: Narodona (?), Oliarces Nymphidae: Myiodactylus Psychopsidae Dilaridae: Dilar Sisyridae: Sisyra REFERENCES CITED Acker, T. S. 1960. The comparative morphology of the male terminalia of Neuroptera (Insecta). Microentomology 24: 25-84. Carpenter, F. M. 1943. Osmylidae of the Florissant shales, Colorado. Am. J. Sci. 241 : 753-760. Kimmins, D. E. 1940. A revision of the osmylid subfamilies Stenosmyli- nae and Kalosmylinae (Neuroptera). Novit. Zool. 42: 165-201, pl. 5-8. MacLeod, E. G., and P. A. Adams. 1968. A review of the taxonomy and morphology of the Berothidae, with the description of a new sub- family from Chile (Neuroptera). Psyche 74: 237-265. Navas, L. 1912. Insectos neurépteros nuevos 6 poco conocidos. Mem. R. Acad. Cienc. Artes Barcelona (3) 10: 135-202. Tjeder, B. 1957. Neuroptera-Planipennia. The lace-wings of South Africa. I. Introduction and Families Coniopterygidae, Sisyridae, and Osmy- lidae. S. African Animal Life 4: 95-188. REVIEW STYLE FORM RITLeE ABSTRACT NOMENCLATURE ILLUSTRATIONS FOOTNOTES TABLES REFERENCES AUTHOR'S COPIES PROOF COPYRIGHT INFORMATION FOR AUTHORS The Publications Committee of the Peabody Museum of Natural History reviews and approves manuscripts for publication. 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