▁Category : Math emat ical ▁analysis ▁Category : L em mas <0x0A> </s> ▁Oct on oba ▁is ▁a ▁genus ▁of ▁Asian ▁c rib ell ate ▁orb ▁we a vers ▁first ▁described ▁in ▁ 1 9 7 9 ▁by ▁Br ent ▁Op ell . ▁M embers ▁of ▁this ▁genus ▁and ▁those ▁of ▁Pur um it ra ▁both ▁have ▁a ▁large ▁con ca ve ▁median ▁ap oph ysis ▁and ▁a ▁consp ic uous ▁h emat od och a . ▁However , ▁these ▁sp iders ▁are ▁generally ▁much ▁larger , ▁with ▁a ▁car ap ace ▁greater ▁than ▁ 1 . 4 ▁mill im eters ▁long , ▁where ▁those ▁of ▁Pur um it ra ▁are ▁usually ▁less ▁than ▁ 1 ▁millimeter ▁long . ▁ ▁Species ▁, ▁it ▁contains ▁ 3 2 ▁species : ▁ ▁Oct on oba ▁alb icola ▁Y osh ida , ▁ 2 0 1 2 ▁Oct on oba ▁amp li ata ▁D ong , ▁Z hu ▁& ▁Y osh ida , ▁ 2 0 0 5 ▁Oct on oba ▁aur ita ▁D ong , ▁Z hu ▁& ▁Y osh ida , ▁ 2 0 0 5 ▁Oct on oba ▁bas u ensis ▁Hu , ▁ 2 0 0 1 ▁Oct on oba ▁b if or ata ▁Z hu , ▁Sh a ▁& ▁Chen , ▁ 1 9 8 9 ▁Oct on oba ▁dent ata ▁D ong , ▁Z hu ▁& ▁Y osh ida , ▁ 2 0 0 5 ▁Oct on oba ▁digit ata ▁D ong , ▁Z hu ▁& ▁Y osh ida ,