Chimarra subpositio Pandher, Kaur & Garima 2020

Pandher, Manpreet Singh, Hussain, Zahid, Kaur, Simarjit, Parey, Sajad Hussain & Majeed, Aquib, 2024, New records for the genus Chimarra Stephens 1829 (Trichoptera: Philopotamidae) in India, Zootaxa 5555 (2), pp. 283-291 : 284-286

Chimarra subpositio Pandher, Kaur & Garima 2020

( Figs 1–6 )

Chimarra subpositio Pandher, Kaur & Garima 2020, p. 579 .

Chimarra bicolor Navás 1932, pp. 23–26 , fig. 29 (preoccupied by Banks 1901).

Material examined. India: Tamil Nadu; Erode, 11°38’14.24”N, 77°19’48.83”E, 746 m, 31.i.2023, 3 males, R Babu, ( HARC, ZSI Solan) .

Diagnosis. The male genitalia of Chimarra subpositio are similar to those of Chimarra auriceps Schmid 1958 (reported from Sri Lanka) as well as Chimarra elamyz Malicky 2012 (reported from Kerala). In lateral view ( Fig. 1 ) of both species, segment IX has a well-developed posteroventral process and the segment is short dorsally, anteroventrally broad, and with its posterior margin convex. However, C. auriceps has sclerotized lateral lobes of tergum X that are broad basally, almost rectangular, each with its posterodorsal margin tapering toward the ventral edge in lateral view ( Fig. 1 ), sickle shaped and apically acute in dorsal view ( Fig. 2 ). In contrast, in C. subpositio , each sclerotized lateral lobe of tergum X is divided into two digitate lobes with a dorsal lobe broad basally and tapering to a downturned and acute apex and a ventral lobe that is triangular with a pointed apex in lateral view ( Fig. 1 ), these lobes convergent and digitate in dorsal view ( Fig. 2 ). Each inferior appendage of Chimarra auriceps in lateral view is constricted basally, three times as broad subbasally as basally and abruptly narrowed and recurved ventrad apically; in caudal view, it is strongly concave mesally and with a large triangular tooth subapicomesally. In contrast, in C. subpositio , each inferior appendage in lateral view ( Fig. 1 ) is broader than in C. auriceps basally, about twice as broad subbasally as basally, and evenly tapered to a caudally directed and acute apex. Preanal appendages in C. auriceps are slender and apically upturned in lateral view, whereas in C. subpositio they are setose and globose-elliptical in lateral view ( Fig. 1 ). Similarly Chimarra elamyz male genitalia are without lateral lobes of segment X and appear as triangular plate (Plate 5), whereas in C. subpositio lateral lobes appear as sclerotized bifid, robust, projections ( Fig. 1 ). Additionally, in dorsal view the male genitalia of C. subpositio have lateral lobes of tergum X as being widely spaced and digitiform and mesal lobes narrowly separated and rounded ( Fig. 2 ) whereas in C. elamyz the lobes appear to be single, narrowly spaced and acute. Further in caudal view, the posteromesal angle on each inferior appendage in C. subpositio is nearly right angled but rounded ( Fig. 3 ), whereas in C. elamyz it is right angled, acute. The phallus in C. subpositio has one small subapical spine and a second elongate one ( Fig.4 ) whereas in C. elamyz has 2 small subapically embedded spines.

Redescription of adult male. Overall color in alcohol light red to yellowish orange; maxillary and labial palps pale brown. Head light yellow, antennae dark brown, legs pale brown. Body covered with golden-yellow pubescence. Wings dark brown. Length from tip of head to apices of folded forewings about 9.5 mm. Length of each forewing 7.00 mm; discoidal cell about 2.25X its width; fork III 2X its stalk length. Length of each hind wing 5.25 mm.

Male genitalia ( Figs 1–6 ). In lateral view ( Fig. 1 ), segment IX reduced anterodorsally, anteroventrally round and almost 3.5 times as long as dorsally; posterolateral margin produced and round at midheight; posteroventral process well developed, broad at base, apically pointed. Preanal appendages globose-elliptical and setose, directed posterodorsad in lateral view ( Fig. 1 ). Inferior appendages longer than tergum X, in lateral view ( Fig. 1 ) each broad subbasally, subapically tapered and curved caudad to acute apex in lateral view; in caudal view ( Fig. 2 ), outer margin of each inferior appendage convex, basal 2/3 of mesal margin forming long and round ridges, apically narrow and curved mesad. Tergum X with pair of sclerotized dorsomesal and lateral lobes and pair of membranous mesal lobes; dorsomesal lobes plate-like, directed caudad, and narrow in lateral view ( Fig. 1 ) and clavate and convergent in dorsal view ( Fig. 2 ); each sclerotized lateral lobe bifid, in lateral view ( Fig. 1 ) with digitate upper lateral lobe broad basally and tapering toward downcurved and pointed apex, in dorsal view ( Fig. 2 ) acute and curved caudad; each triangular lower lateral lobe apically pointed in lateral view ( Fig. 1 ); in lateral view ( Fig. 1 ) membranous mesal lobes of tergum X visible between sclerotized dorsomesal lobes and lateral lobes, band shaped, snake-hood-like; in dorsal view ( Fig. 2 ) pair of membranous mesal lobes more or less parallel, widely separated, directed caudad and slightly mesad to round apices. Phallus large, phallobase globular, endotheca tubular, apical phallotreme membranous, phallotremal sclerite complex and visible, two well developed spines especially visible with longer spine 3–4X as long as smaller spine.

Remarks. Philopotamus bicolor Banks 1901 was transferred to genus Chimarra (as Chimarrha ) by Ulmer (1957), making Chimarra bicolor Navás 1932 , from India, a junior secondary homonym, preoccupied in Chimarra by Chimarra bicolor ( Banks 1901) .Therefore, Navás’ species name was replaced as Chimarra subpositio by Pandher et al. (2020) to stabilize the taxonomy of species names in this genus (International Commission on Zoological Nomenclature 1999, Articles 60.3, 72.7).

Distribution. India (Tamil Nadu, Maharashtra, Kerala).

Figures

FIGURES 1–6. Chimarra subpositio Pandher, Kaur & Garima 2020, male genitalia. 1, left lateral; 2, dorsal; 3, right inferior appendage, caudal; 4, phallus, dorsal; 5, phallus, left lateral; 6, phallus ventral.