Chiloconger Myers and Wade, 1941

David G. Smith & Emma S. Karmovskaya, 2003, A new genus and two new species of congrid eels (Teleostei: Anguilliformes: Congridae) from the Indo-West Pacific, with a redescription and osteology of Chiloconger dentatus., Zootaxa 343, pp. 1-19: 2-3

publication ID

z00343p001

persistent identifier

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scientific name

Chiloconger Myers and Wade, 1941
status

 

Chiloconger Myers and Wade, 1941  ZBK 

Chiloconger Myers and Wade, 1941  ZBK  : 65

Type species: Chiloconger labiatus Myers and Wade, 1941  ZBK  : 66.

Diagnosis. Body moderately elongate, preanal length greater than 40% TL; tip of tail blunt and stiffened, caudal fin reduced; dorsal fin begins over posterior part of appressed pectoral fin; dorsal- and anal-fin rays unsegmented; upper end of gill opening opposite upper part of pectoral-fin base, not enclosing pectoral fin; snout short and blunt, eye large, its diameter slightly greater than snout length; well developed, broadly rounded and elevated flange on upper lip, covering a hollowed-out area; adnasal pore present in at least one species, second and fifth infraorbital pores present, but third and fourth absent; maxillary and mandibular teeth irregularly biserial or triserial, not forming a cutting edge; lateral ethmoid process present, supraoccipital present, posterior end of urohyal simple (not trifurcate).

Relationships. Smith (1989: 490) observed that the Bathymyrinae  could be divided into two groups. One group contains the genera Ariosoma  ZBK  , Bathymyrus  ZBK  , and Parabathymyrus  ZBK  and is characterized as follows: supraoccipital bone absent, urohyal trifurcate, adnasal pore absent, third and fourth infraorbital pores present, leptocephali with lateral pigment consisting of a series of short, oblique rows of tiny melanophores on myosepta. The other group contains Paraconger  ZBK  and Chiloconger  ZBK  and is characterized as follows: supraoccipital bone present, urohyal simple, adnasal pore usually present, third and fourth infraorbital pores absent, leptocephali with lateral pigment consisting of a single series of moderately large melanophores along midlateral line. At the time, Smith had no detailed information on Chiloconger  ZBK  , but he assigned it to the Paraconger  ZBK  group on the basis of retained larval pigmentation in a small specimen. Information presented here (see below) confirms Smith's conclusion; Chiloconger dentatus  has a supraoccipital and a simple urohyal. In addition, Chiloconger philippinensis  ZBK  , at least, has an adnasal pore, and both species lack the third and fourth infraorbital pores.

Key to species

1a. Predorsal length 20-26 % TL, preanal LL pores 19-27, vertebrae 118-122 ................. ............................................................................................ C. dentatus  (eastern Pacific)

1b. Predorsal length 18-19 % TL, preanal LL pores 36-39, vertebrae 113-115 ................. .................................................................................. C. philippinensis  ZBK  (western Pacific)