Bioacoustics of Lernanthropus seriolii

Distribution: Lernanthropus seriolii was originally described by Shishido (1898) based on material collected from the gills of Seriola lalandi caught off Japan . Izawa (2014) redescribed this species (as L. seriolae ) after examination of material from the same host caught in Japanese waters. The change in spelling to seriolae is an unjustified emendation, first used by Yamaguti (1963) ; the original spelling was subsequently used by Izawa (2018) and is maintained here. Lernanthropus seriolii is very similar in gross morphology to L. paenulatus Wilson, 1922 which was described from material collected from the gills of the same host ( S. lalandi ) caught off the Atlantic coast of the USA at Woods Hole, Massachusetts and at Beaufort, North Carolina ( Wilson, 1922 ). According to Izawa (2014) , L. seriolii can be distinguished from L. paenulatus most readily by the form of the female leg 5. In L. seriolii the fifth legs form elongate lamellae, which extend well beyond the tips of the caudal rami, whereas in L. paenulatus the fifth legs were described by Wilson (1922: 52) as “a pair of short fifth leg rudiments just in front of genital segment”. Re-examina- tion of the type material of L. paenulatus stored in the USNM revealed that Wilson’s description was erroneous: L. paenulatus possesses elongate lamellate fifth legs, as described for L. seriolii . In the absence of other substantive differences, we propose to treat L. paenulatus as a junior subjective synonym of L. seriolii . Previous records of L. paenulatus from Australia should be attributed to L. seriolii : Hutson et al . (2007a) reexamined material from S. lalandi caught in New Zealand waters, originally reported as Lernanthropus sp. by Smith et al . (2004) and one of us (GAB) identified it as L. paenulatus . Rohde et al . (1995) had first reported L. paenulatus from Australia , on S. lalandi caught at Coffs Harbour (NSW). Re-examination here of Rohde’s material stored in Natural History Museum, London confirms that the Australian material from Coffs Harbour is L. seriolii . The material reported by Hutson et al . (2007a) as L. paenulatus from the same host taken at Sir John Woods Banks (NSW) and off Killarney ( Victoria ) and material reported by Hutson et al . (2007b) from Seriola hippos is also now reassigned to L. seriolii , as is the record of L. paenulatus from a Seriola sp. caught in China ( Song & Chen, 1976 ).