Corinnomma plumosum ( Thorell, 1881 )

Sankaran, Pradeep M., 2023, An update on the ant-mimicking genus Corinnomma Karsch, 1880 (Araneae, Corinnidae, Castianeirinae), Zootaxa 5254 (4), pp. 534-544 : 536

Corinnomma plumosum ( Thorell, 1881)

Figs 3 , 5C

Corinna plumosa Thorell, 1881: 216 (♁).

Castaneira plumosa Simon, 1897: 167 (lapsus).

Corinnomma plumosa Deeleman-Reinhold, 2001: 305 , 397.

Type material. Holotype ♁ from INDONESIA: Moluccas / Maluku Islands: Ternate (00°48′N, 127°20′E; 1104 m a.s.l.), date unknown, leg. O. Beccari, repository MSNG (no register number), examined based on photographs.

Diagnosis. Males of C. plumosum are closely related to those of C. severum in having a long embolus, but can be distinguished from the latter species by the presence of a wide cymbial retrobasal process (vs. absent in C. severum ), strongly spiralled embolus (vs. weakly in C. severum ), and obliquely oriented loop of sperm duct (vs. longitudinally oriented in C. severum ) (cf. Figs 3C–D , 5C with Figs 4C–E , 5D ).

Redescription. Male (holotype, Fig. 3A–B ) in alcohol (somatic features after Thorell (1881)). Prosoma pitchblack, unevenly covered with greenish-grey feathery setae, almost twice as long as its width, with thoracic striae. Fovea short, distinct. AER strongly recurved, PER strongly procurved ( Fig. 3B ); ALEs oblong, all other eyes round ( Fig. 3B ). Sternum pitch-black, sub-elliptical, pubescent. Opisthosoma subovate, black, with median, transverse constriction ( Fig. 3A ), with three transverse greenish-grey stripes. Anterior legs brownish, posterior blackish, with greenish-grey spots and stripes on all femora. Body length 7.0. Pedipalp ( Figs 3C–D , 5C ): cymbium retrobasally with flat, triangular process, retrobasal paracymbial spine shifted apically onto this process ( Fig. 3C ). Tegulum pearshaped, with less coiled sperm duct having obliquely oriented loop ( Fig. 3C ). Embolus moderately long, forming open spiral, with broad proximal part and blunt tip directed at 11-o’clock in ventral view ( Figs 3C , 5C ).

Female. Unknown.

Distribution. Indonesia ( Moluccas) ( Thorell 1881).

Figures

FIGURE 3. Corinnomma plumosum (Thorell, 1881), holotype male. A habitus, dorsal; B eye group, dorsal; C–D left pedipalp: C ventral, D retrolateral; E labels from type bottle. All figures are not to scale. © MSNG, Genova, Italy.

FIGURE 4. Corinnomma severum (Thorell, 1877), holotype male.A habitus, dorsal; B eye group, dorsal; C–E left pedipalp: C prolateral, D ventral, E retrolateral; F labels from type bottle. All figures are not to scale. © MSNG, Genova, Italy.

FIGURE 5. Male emboli of Corinnomma spp., ventral. A C. javanum Simon, 1905 (syntype); B C. moerens Thorell, 1890 (holotype); C C. plumosum (Thorell, 1881) (holotype); D C. severum (Thorell, 1877) (holotype); E C. simplex Zhang, Jin & Zhang, 2022. All figures are not to scale. © MSNG, Genova, Italy (B–D), ZMH, Germany, (A), ADSH, India (E).