Phanoperla circumspina, Sivec & Stark, 2011

Sivec, Ignac & Stark, Bill P., 2011, New Species Of Neoperla Needham And Phanoperla Banks (Plecoptera: Perlidae) From The Philippine Islands, Illiesia 7 (24), pp. 264-279 : 274-275

Phanoperla circumspina sp. n.

( Figs. 45-54 )

Material examined. Holotype ♂ and 14♂, 1♀ paratypes, PHILIPPINE ISLANDS, Palawan, Salakot Falls Road, 300 m, 19 March 1996, ( PZ). Additional paratypes: Palawan, San Rafael, Ulanguan, end of February 1996, 6♂ ( PZ), 1♂, 1♀ ( PMSL). Specimens deposited in the PZ collection, or the PMSL as indicated.

Adult habitus. General color pale yellow-brown, patterned with pale brown. Head pale brown, slightly darker anterior to M-line ( Fig. 45 ). Pronotum pale with scattered darker rugosities and narrow dark band along median suture. Ocelli almost touching.

Male. Forewing length 9 mm. Tergum 9 with a small median and two larger lateral patches of sensilla ( Fig. 46 ). Hemiterga typical, without special modifications, hemitergal lobes short, wide basally, pointed at the apex and triangular in outline. Penis tube subequal to sac in length, without lobes or armature ( Figs. 47-50 ); dorsal margin of tube weakly sclerotized, ventral margin membranous. Sac armed near apex with double ring of widely spaced, large black spines, mostly clustered in groups of three; a few small spines located near sac base, and intermingled with large black spines; apex a small cylinder armed over most of surface with small black spines.

Female. Forewing length 11 mm. Genitalic structures damaged.

Egg. Outline oval with short, wide collar ( Fig. 51 ). Total length ca. 227 μm, equatorial width ca. 176 μm, collar length ca. 23 μm. Chorion covered throughout with coarse, circular punctations, becoming less abundant on lid ( Figs. 52-54 ). Collar rim scarcely flanged, sides bearing a series of vertical ridges.

Larva. Unknown.

Etymology. The species name refers to the circular arrangement of large spines near the penial sac apex.

Diagnosis. This species is a member of the P. flaveola ( Klapálek, 1910) species group and appears to be closely related to P. flaveola , a species reported from several of the Philippine islands, including Palawan ( Zwick 1982) and to P. magnaspina sp. n., described below. Externally, P. flaveola differs from the new species in the absence of a median patch of sensilla and small sclerite on tergum 9, and the two differ subtly in details of the penial armature. The distal ring of spines in the new species has three, much larger spines ventrally and small gaps adjacent to the larger spines, whereas the distal ring for P. flaveola lacks gaps adjacent to the larger spines. In addition, the proximal spine groupings in P. flaveola consist of five spines and in P. circumspina , they consist of three spines.

Figures

Figs. 45-50. Phanoperla circumspina. 45. Head and pronotum. 46. Male terminalia. 47-50. Penis tube and everted sac. 47. Ventral aspect. 48. Dorsal aspect. 49. Lateral aspect. 50. Apical aspect.

Figs. 51-54. Phanoperla circumspina egg. 51. Entire egg. 52. Collar end. 53. Chorionic detail. 54. Anterior end.