Old/PT Imp Group

Info

PT Imp Group (A) No.637 PT小鬼群 Abyssal Class Patrol Torpedo Boat

Statistic
HP	9	Firepower	9
Armor	19	Torpedo	88
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
			0
-			-
-			-

PT Imp Group (B) No.638 PT小鬼群 Abyssal Class Patrol Torpedo Boat

Statistic
HP	9	Firepower	9
Armor	29	Torpedo	98
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

PT Imp Group (C) No.639 PT小鬼群 Abyssal Class Patrol Torpedo Boat

Statistic
HP	15	Firepower	15
Armor	29	Torpedo	98
Evasion	'	AA	18
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

PT Imp Group (D) No.640 PT小鬼群 Abyssal Class Patrol Torpedo Boat

Statistic
HP	18	Firepower	18
Armor	39	Torpedo	118
Evasion	'	AA	24
Aircraft	0	ASW	'
Speed	Fast	LOS	'
Range	Short	Luck	'
Equipment			Space
22inch Torpedo Mk.II			0
22inch Torpedo Mk.II			0
-			-
-			-

Unlike most standard Abyssal enemies, the PT Imp Group is relatively small and fast. Attacking them with large-caliber guns will not do much damage; smaller guns are recommended to deal normal damage.
On 11/20/2015, a tweet revealed a bug that prevented destroyers from being able to hit the PT Imp Groups. As a result the devs readjusted the damage calculations in a live patch update on the same day.
The PT Imp Groups are vulnerable to attacks from destroyers, light cruisers, and ships equipped with Anti-Air Guns (refer to the List of Anti-Air Guns for more details) and Skilled Lookouts.