Phanoperla magnaspina, 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 : 277-278

Phanoperla magnaspina sp. n.

( Figs. 55-64 )

Material examined. Holotype ♂ and 21♂, 13♀ paratypes, PHILIPPINE ISLANDS, Palawan, Salakot Falls Road, 300 m, 19 March 1996, (holotype and 19 ♂, 11 ♀ paratypes PZ), 2♂, 2♀ ( PMSL). Additional paratypes: Palawan, San Rafael, Ulanguan, end of February 1996, 2♂, 3♀ ( PZ). Specimens deposited in the PZ collection, or the PMSL as indicated.

Adult habitus. General color pale with darker markings on pronotum. Head pale with pale M-line distinct. Ocelli separated by about 0.5 diameters ( Fig. 55 ). Antennae pale brown. Pronotum with pale narrow band along median suture and scattered dark rugosities on disc.

Male. Forewing length 9 mm. Tergum 9 with two sparse patches of sensilla located distal to hemitergal lobe apices ( Fig. 56 ). Hemitergal lobes broad basally, tapered to an acute apex and curved slightly laterad. Penis tube plus sac plump, short and armed with a subapical ring of prominent black spines and a pair of lateral clusters of large dark spines set proximally to subapical ring ( Figs. 58-60 ). Apex of sac cylindrical, much smaller in diameter than median and basal sections of sac, and covered with coarse to fine triangular spines; areas around spine ring and lateral clusters of large spines also bearing numerous small spines. Largest spines located in a cluster of eight along ventral side of subapical ring.

Female. Forewing length 11 mm. Subgenital plate slightly produced over base of sternum 9 and bearing a quadrate median notch ( Fig. 57 ).

Egg. General outline spindle shaped with short, wide collar ( Fig. 61 ). Total length ca. 389 μm, equatorial width ca. 239 μm, collar length ca. 19 μm. Chorion covered over much of surface with coarse punctations; subequatorial zone and sub collar zones with pits obscure or absent ( Figs. 62-64 ). Micropyles small and sessile. Sides of collar bearing several prominent ridges, which extend onto egg body.

Larva. Unknown.

Etymology. The species name refers to the enlarged group of spines in the subapical ring of the penis sac.

Diagnosis. This species is similar in color pattern and penial armature to P. circumspina sp. n., but differs externally from that species in lacking a median patch of sensilla on tergum 9 and in having the ocelli more widely separated. The two also differ in details of penial sac armature, with P. magnaspina having a cluster of ca. 8 very large spines in the subapical ring, whereas in P. circumspina , only three moderately large spines occur in this position.

Figures

Figs. 55-60. Phanoperla magnaspina. 55. Head and pronotum. 56. Male terminalia. 57. Female subgenital plate outline. 58. Everted penis sac, apical aspect. 59. Everted penis sac, lateral aspect. 60. Penis tube and everted sac, dorsal aspect.

Figs. 61-64. Phanoperla magnaspina egg. 61. Entire egg. 62. Collar end. 63. Chorionic detail. 64. Anterior end.