| Alistra pikachu | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Hahniidae |
| Genus: | Alistra |
| Species: | A. pikachu |
| Binomial name | |
| Alistra pikachu Lin & Li, 2021 | |
Alistra pikachu is a species of dwarf sheet spider found in China. [1] [2]
The species is named after Pikachu, a fictional character from Pokémon, as the general color of this species is yellow. [1]
Males of A. pikachu are similar to those of A. hippocampa in having a slender embolus, short cymbial furrow, and an absence of the median apophysis and conductor, but they differ by the absence of patellar apophyses (present in A. hippocampa) and by having a long, thin retrolateral tibial apophysis (short in A. hippocampa). Females are distinguished from other Alistra species by the folded copulatory ducts and oval spermathecae. [1]
The male holotype has a total length of 1.55 mm while males total length varies 1.45 to 1.62 mm. The prosoma is 0.71 mm long and 0.63 mm wide; the opisthosoma is 0.92 mm long and 0.63 mm wide. Leg formula is 4123. The palp has a patella without an apophysis. The palpal tibia is longer than the patella, and the retrolateral tibial apophysis is sickle-shaped. The embolus originates prolatero-basally, curves clockwise along the tegular margin, and is semicircular. The cymbium has a short, deep furrow one quarter the length of the cymbial length. [1]
The female paratype has a total length of 1.84 mm while females' total length varies from 1.63 to 1.84 mm. The prosoma is 0.71 mm long and 0.72 mm wide; the opisthosoma is 1.12 mm long and 0.79 mm wide. Leg formula is 4123. The opisthosoma is yellow-brown. The epigyne is small and simple, with folded copulatory ducts and an oval spermathecae. [1]
The species is known only from the type locality: Jile Cave, Gaofengdaoban, Yangshan County, Guangdong, China. [1]